f&S The AmericanSocietyof

# Qb MechanicalEngineers

A N AMERICAN N A T.I 0 N A L STANDARD

VAlVES-FlA
THREADE
AND
EN
VllElDlN

ASME
BlB.34~1
UUB
(Revision
ofASMVANSI
BlB.34~1988
 Date of Issuance: January 31, 1997

The 1996 edition of this Standard is being issued with an automatic addenda
subscription service. The use of an addenda allows revisions made in response
to public review comments or committee actions to be published as necessary;
revisions published in addenda will become effective 6 months after the Date
of Issuance of the addenda. The next edition of this Standard is scheduled for
publication in 2001.

ASME issues written replies to inquiries concerning interpretations of technical

aspects of this Standard. The interpretations will be included with the above
addenda service. Interpretations are not part of the addenda to the Standard.

ASME is the registered trademark of the American Society of Mechanical Engineers.

This code or standard was developed under procedures accredited as meeting the criteria for
American National Standards. The Consensus Committee that approved the code or standard was
balanced to assure that individuals from competent and concerned interests have had an
opportunity to participate. The proposed code or standard was made available for public review
and comment which provides an opportunity for additional public input from industry, academia,
regulatory agencies, and the public-at-large.
ASME does not “approve,” ” rate,” or “endorse” any item, construction, proprietary device, or
activity.
ASME does not take any position with respect to the validity of any patent rights asserted in
connection with any items mentioned in this document, and does not undertake to insure anyone
utilizing a standard against liability for infringement of any applicable Letters Patent, nor assume
any such liability. Users of a code or standard are expressly advised that determination of the
validity of any such patent rights, and the risk of infringement of such rights, is entirely their own
responsibility.
Participation by federal agency representative(s) or person(s) affiliated with industry is not to be
interpreted as government or industry endorsement of this code or standard.
ASME accepts responsibility for only those interpretations issued in accordance with governing
ASME procedures and policies which preclude the issuance of interpretations by individual
volunteers.

No part of this document may be reproduced in any form,

in an electronic retrieval system or otherwise,
without the prior written permission of the publisher.

The American Society of Mechanical Engineers

345 East 47th Street, New York, NY 10017

Copyright 0 1997 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All Rights Reserved
Printed in U.S.A.
 AN AMERICAN NATIONAL STANDARD

ASME B16.34a-1998

to

ASME B16.34-1996
VALVES - FLANGED, THREADED,
AND WELDING END

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS

Three Park Avenue l New York, NY 10016

 Date of Issuance: November 2, 1998

ASME is the registered trademark of The American Society of Mechanical Engineers.

This code or standard was developed under procedures accredited as meeting the criteria for
American National Standards. The Standards Committee that approved the code or standard
was balanced to assure that individuals from competent and concerned interests have had an
opportunity to participate. The proposed code or standard was made available for public review
and comment which provides an opportunity for additional public input from industry, academia,
regulatory agencies, and the public-at-large.
ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device,
or activity.
ASME does not take any position with respect to the validity of any patent rights asserted in
connection with any items mentioned in this document, and does not undertake to insure anyone
utilizing a standard against liability for infringement of any applicable Letters Patent, nor assumes
any such liability. Users of a code or standard are expressly advised that determination of the
validity of any such patent rights, and the risk of infringement of such rights, is entirely their
own responsibility.
Participation by federal agency representative(s) or person(s) affiliated with industry is not to
be interpreted as government or industry endorsement of this code or standard.
ASME accepts responsibility for only those interpretations issued in accordancewith governing
ASME procedures and policies which preclude the issuance of interpretations by individual
volunteers.

No part of this document may be reproduced in any form,

in an electronic retrieval system or otherwise,
without the prior written permission of the publisher.

The American Society of Mechanical Engineers

Three Park Avenue, New York, NY 10016-5990

Copyright 0 1998 by
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
All Rights Reserved
Printed in U.S.A.
 ASME B16.34a-1998

Following approval by the ASME B16 Committee and ASME, and after public review, ASME B16.34a-
1998 was approved by the American National Standards Institute on April 3, 1998.

Addenda to the 1996 Edition of ASME B16.34 are issued in the form of replacement pages. Revisions,
additions, and deletions are incorporated directly into the affected pages. It is advisable, however, that this
page, the Addenda title and copyright pages, and all replaced pages be retained for reference.

SUMMARY OF CHANGES

This is the first Addenda to be published to ASME B16.34-1996.

Replace or insert the pages listed. Changes given below are identified on the pages by a margin note, (a),
placed next to the affected area. The pages not listed are the reverse sides of the listed pages and contain
no changes.

Page Location Change

vi Foreword In the last paragraph, ASME address updated

vii, viii Committee Roster Updated

2 2.1(g) Second line corrected by Errata

5 5.1.2 Fourth line corrected by Errata

7 6.2.1 Subparagraphs (a), (b), and (c) corrected by

Errata

10 6.7 (1) Title corrected by Errata

(2) Subparagraph (g) deleted

7.1 In first paragraph,eighth line correctedby Errata

22 Fig. 17 Revised

23-28 Table 1 (1) In Group No. 1.1, Nominal Designation and

Forgings revised
(2) In Group No. 1.2, Nominal Designation and
Forgings revised
(3) Group No. 1.15 added
(4) In Group No. 2.2, under Nominal Designa-
tion, 16Cr-2Ni-2Mo corrected by Errata to
read 16Cr-12Ni-2Mo
(5) Group No. 2.8 revised
Page Location Change

23-28 Table 1 (6) In Group No. 3.1, Nominal Designation and

Castings revised
(7) In Group No. 3.8, Forgings, Spec. No. B
574 corrected by Errata to read B 564
(8) Group No. 3.17 added

33 Table 2- 1.1 (1) Third column revised

(2) Note (7) added

34 Table 2-1.2 (1) Revised

(2) Note (4) added

36 Table 2- 1.4B Working pressure for Class 4500 at 600°F cor-

rected by Errata to read 8,920

37 Table 2-1.5 First line of Note (1) corrected by Errata

Table 2- 1.5B Working pressure for Class 900 at 950°F cor-

rected by Errata to read 1,055

38 Table 2-1.6 Note (1) corrected by Errata

52 Table 2-1.14B Working pressure for Class 1500 at 700°F cor-

rected by Errata to read 3,665

52.1 Table 2- 1.15 Added

Table 2-1.15A Added

Table 2-1.15B Added

53 Table 2-2. IA Working pressurefor Class 300 at 1050°F (310)

added by Errata

54 Table 2-2. IB - (1) Working pressure for Class 600 at 200°F

corrected by Errata to read 1,335
(2) Working pressure for Class 900 at 1050°F
corrected by Errata to read 1,155

55, 56 Table 2-2.2 (1) In second column, A 351 Gr. CF3H cor-
rected by Errata to read A 351 Gr. CF3M
(2) In third column, A 351 Gr. CF8H corrected
by Errata to read A 351 Gr. CF8M
(3) In fourth column, A 351 Gr. CG8H corrected
by Errata to read A 351 Gr. CG8M

Table 2-2.2B Working pressure for Class 900 at 1450°F cor-

rected by Errata to read 220

57 Table 2-2.3B (1) Working pressure for Class 600 at 850°F

corrected by Errata to read 720
(2) Working pressure for Class 900 at 800°F
corrected by Errata to read 1,100

58 Table 2-2.4A Under Working Pressure for Class 600:

(1) At 1150”F, 370 corrected by Errata to
read 475

(4
Page Location Change

58 Table 2-2.4A (2) At 1200”F, 365 corrected by Errata to

read 370

66 Table 2-2.8 (1) New second column added

(2) A 351 Gr. CESMN, A 351 Gr. CD4MCu,
and A 35 1 Gr. CD3MWCuN addedto fourth
column

67 Table 2-3.1 Revised

Table 2-3.1A Revised in its entirety

Table 2-3.1B Revised in its entirety

70 Table 2-3.3B Working pressure for Class 600 at 700°F cor-

rected by Errata to read 480

72 Table 2-3.5A Working pressurefor Class 4500 at 1150°F cor-

rected by Errata to read 1,020

75 Table 2-3.7B Working pressure for Class 1500 at 700°F cor-

rected by Errata to read 3,665

79 Table 2-3.9B Working pressure for Class 1500 at 400°F cor-

rected by Errata to read 3,335

81 Table 2-3.llB Working pressure for Class 150 at 700°F cor-

rected by Errata to read 175

86 Table 2-3.15B Working pressurefor Class 2500 at 1250°F cor-

rected by Errata 1,895

87 Table 2-3.16A Working pressurefor Class 2500 at 1150°F cor-

rected by Errata to read 1,545

88.1 Table 2-3.17 Added

Table 2-3.17A Added

Table 2-3.17B Added

92 Table 4 Column head 50 Through 300 corrected to read

150 Through 300 by Errata

93 Annex A In second paragraph, eleventh line corrected by

Errata

103-105 F2.1 (1) In nomenclature, P, corrected to read pea

by Errata
(2) In subparagraph(d), first line corrected by
Errata

F3.1 (1) In nomenclature, P, corrected to read ps,,

by Errata
(2) In nomenclature, Pcb corrected to read pcb
by Errata

106 Table F4-A Title, Special Class Valves, corrected by Errata

to read Standard Class Valves
Page Location Change

109 G2.1.3 (1) In nomenclature, Pld corrected by Errata to

read Pld
109 G2.1.3 (2) In nomenclature, P, corrected by Errata to
read psp
(3) Text table head 900 and Above correctedby
Errata to read 900 and Below

110 G6.1.8 In nomenclature, PO corrected by Errata to

read pO

115 Annex I ASME address updated

119 Interpretations ASME addressupdated

SPECIAL NOTE:

The Interpretations to ASME B16.34 are included in this Addenda as a separate section for user’s conve-
nience. This section, however, is not part of the Addenda or the edition.
 (These introductory notes are not part of ASME 816.34-1996.)

An American National Standard is intended as a basis for common practice by the

manufacturer, the user, and the general public. The existence of an American National
Standard does not in itself preclude the manufacture, sale, or use of products not conforming
to the standard. Mandatory conformance is established only by reference to the standard
in a code, specification, sales contract, or public law.
It should be noted, specifically with regard to this Standard, that certain requirements
reflecting the general application of valves in a wide variety of services may not be
considered to be appropriate for some valves whose application is known and which may
incorporate certain features found by successful experience to be satisfactory. A specific
case in point is that involving valves developed and used in gas and petroleum product
pipelines. Conformance of such valves to the existing industry standard, API 6D, may by
itself be sufficient to satisfy the requirements of Federal Rules and Regulations established
by the Department of Transportation, Office of Pipeline Safety Operations. Another specific
case is that involving valves used in instrument systems under an applicable Piping Code.
Conformance of such valves to the requirements of an existing Piping Code may by itself
be sufficient to satisfy jurisdictional rules and regulations.
This edition of ASME B16.34 is based on U.S. Customary Units of measurement which
are to be regarded as the standard. Conversion factors between metric SI units and U.S.
Customary Units are given in SI-1, ASME Orientation and Guide for Use of SI (Metric)
Units, and ASTM E380. Care is required when converting equations that contain constant
terms or factors since they may also require conversion.

...
111
 FOREWORD (a)

(This Foreword is not part of ASME 816.34-1996.)

In December 1969, American National Standards Committee B16 changed its name from
Standardization of Pipe Flanges and Fittings to Standardization of Valves, Fittings, and
Gaskets, reflecting American National Standards Institute approval of a broadened scope
for the B16 Committee. At the same meeting, the committee approved a plan for the
organization of a subcommittee to develop a new standard for steel valves with other than
flanged ends. Subsequently, B16 Subcommittee 15 was appointed and held its first meeting
in December 1970.
Historically, in the development of standards and pressure-temperature ratings for steel
valves, the various rating classes for flanges provided an obviously logical basis for valve
ratings. Steel valves with flanges of standard dimensions, many also offered in buttwelding-
end versions, were given the same pressure-temperature ratings as the flanges. In 1949, a
new edition of the standard, then designated Bl6e 1949, was published, in which a table
covering wall thickness requirements for weld end valves had been added. In 1964, the
Manufacturer’s Standardization Society of the Valve and Fittings Industry developed and
published Standard Practice SP 66, covering pressure-temperature ratings of steel buttwelding-
end valves. SP 66 introduced a new method for establishing ratings by making ratings a
function of the mechanical strength properties of the body material at all temperatures.
Following the publication of SP 66, B16 activated Subcommittee 4 for the purpose of
studying the general subject of pressure-temperature ratings and developing rational criteria
for such ratings.
In the B16 charge to Subcommittee 15, it was established that the new standard would
replace SP 66 and also remove the reference to buttwelding-end valves from B16.5. Flanged-
end valves would continue to be covered in B16.5 but on a fully specified basis, rather
than as an add-on.
As the work of the subcommittee got underway, concurrent action was initiated in
Subcommittee 3 for revision of B16.5. Subsequent operations of Subcommittees 3 and 15
were closely coordinated to provide assurance that the new standard and the revised B16.5
would be compatible.
A key and basic issue of mutual concern in this coordination was the matter of pressure-
temperature ratings. It was necessary to incorporate the SP 66 type ratings in the new
standard, but at the same time also to provide ratings equivalent to those in B16.5 covering
the buttwelding equivalents of flanged-end valves. Subcommittee 4 had made definitive
recommendations for revisions in the flange ratings and it was obviously desirable to
rationalize the two types of ratings as they would appear side-by-side in the new standard.
The results of these efforts appear herein in the form of pressure-temperature ratings
tables. The method of computing the ratings is detailed in Annex F. The ratings differ
from the pre-1968 B16.5 ratings because they are now calculated as a function of the
mechanical properties of the pressure boundary materials, in contrast to the empirical basis
used previously. A change in the SP 66 type rating (herein designated Special Class)
discontinues the application of a plasticity factor at elevated temperatures which, in the
opinion of the committee, could not be justified in dimension-sensitive valves.

V
 Other innovations include the coverage of forged or fabricated body valves and an increase
in detailed coverage by pressure-temperature ratings from 17 materials in B16.5 to 24
material groups in the new standard and in the revised B16.5. Dimensional requirements
have been refined and augmented to give the designer more latitude and the user more
assurance of adequacy. A number of the innovations have had trial use and at least some
degree of acceptance, as they have been taken from the section on valve requirements
developed and published by the ASME Boiler and Pressure Vessel Code to cover valves
used in nuclear power plants. A section on valve testing eliminates uncertainties on such
points as seat test requirements and stem seal testing.
Approval for the 1973 edition of the Standard by the American National Standards
Institute was granted in October 1973.
In December 1973, a reorganization of the subcommittee structure for B16 was approved.
Subcommittee 15 was redesignated as Subcommittee N and was assigned responsibility for
all steel valves. Work began to include coverage for flanged-end valves in ANSI B16.34.
The 1977 edition contained flanged-end valve requirements formerly in ANSI B16.5. The
rating procedures of B16.5 were adopted and made applicable to Standard Class buttwelding-
end valves. The method of deriving ratings was revised. Major changes were made in the
method for determining ratings for austenitic stainless steel valves and ratings for Class
150 valves for all materials. The pressure-temperature tables and materials groups were
rearranged and revised using data from the reference Sections of the ASME Boiler and
Pressure Vessel Code through the Summer 1975 Addenda. A number of clarifying and
editorial revisions were also made in order to improve the text. It was also resolved that
frequent minor changes in pressure-temperature ratings because of revisions to the reference
material strength property tables should be avoided and that, as a general guide, such
changes should not be considered unless resulting ratings would be changed by an amount
in excess of 10%.
Approval for the 1977 edition of the Standard by the American National Standards
Institute was granted on June 16, 1977.
During 1979, work began on the 1981 edition. Materials coverage was expanded. Nickel
alloys and other alloys were added. Bolting rules were revised to accommodate special
alloy bolting for the new materials. Revisions were included to clarify requirements for
rotary motion valves., e.g., ball valves and butterfly valves. Wafer-type valves were specifically
identified. Other clarifying and editorial revisions were made in order to improve the text.
Following approvals by the Standards Committee and Secretariat, approval for the 1981
edition was granted by the American National Standards Institute on August 14, 1981.
During 1985, revisions were proposed that added requirements for socket welding-end
and threaded-end valves. The inclusion of requirements for these valves increased the scope
of the Standard. Also, the listings for nickel alloy and other alloy valves materials were
expanded. Rules for threaded body joints were added, and wafer-type valve body rules
improved.
Following approvals by the Standards Committee and ASME, approval for the 1988
edition was granted by the American National Standards Institute on February 24, 1988.
During 1993 and carrying over into 1994, revisions offered included multiple material
marking and an improved interpolation procedure. New materials were added and the
pressure-temperature rating tables were recalculated in accordance with Annex F using the
latest data available from the reference ASME Boiler and Pressure Vessel Code sources.
An Annex was added covering nonmandatory requirements for a quality system program.
Following the approvals the Standards Committee and ASME, approval for the new
edition was granted by the American National Standards Institute on October 3, 1996.
All requests for interpretation or suggestions for revisions should be sent to the Secretary,
B16 Committee, The American Society of Mechanical Engineers, Three Park Avenue, New
York, NY 100 16-5990.

vi
 ASME B16 COMMllTEE
Standardization of Valves, Flanges, Fittings, Gaskets, and Valve
Actuators

(The following is the roster of the Committee at the time of approval of this Standard.)

OFFICERS

W. N. McLean, Chair
R. A. Schmidt, Vice Chair
P. A. Reddington, Secretary

COMMllTEE PERSONNEL

W. L. Ballis, Consultant, London, Ohio

I?. W. Barnes, Anric Enterprises, Elobicoke, Ontario, Canada
FL R. Brodin, Fisher Controls International, Inc., Marshalltown, Iowa
M. A. Clark, NIBCO Inc., Elkhart, Indiana
C. E. Floren, Mueller Co., Decatur, Illinois
D. R. Frikken, Monsanto Co., St. Louis, Missouri
R. Henrich, Minnegasco Inc., Golden Valley, Minnesota
J. C. Inch, Mueller Brass Co., Hartsville, Tennessee
G. A. Jolly, Vogt Valve Co., Louisville, Kentucky
W. G. Knecht, BW/IP International Inc., Williamsport, Pennsylvania
R. Koester, The William Powell Co., Cincinnati, Ohio
W. N. McLean, Newco Valves, Palos Park, Illinois
M. L. Nayyar, Bechtel Corp., Gaithersburg, Maryland
R. A. Schmidt, Ladish Co., Russellville, Arkansas
T. F. Shroud, Ductile Iron Pipe Research Association, Birmingham, Alabama
H. R. Sonderegger, Grinnel Corp., Cranston, Rhode Island
W. M. Stephan, Flexitalic, Inc., Pennsauken, New Jersey
M. D. Wasicek, ABS Americas, Houston, Texas
R. E. White, Repairs, Inc., South Bend, Indiana
D. A. Williams, Southern Company, Services, Birmingham, Alabama
L. A. Willis, Dow Chemical Co., Freeport, Texas
W. R. Worley, Union Carbide Corp., South Charleston, West Virginia

SUBCOMMITTEE N - STEEL VALVES

W. N. McLean, Chair, Newco Valves, Palos Park, Illinois

U. D’Urso, Secretary, ASME. New York, New York
E. A. Bake, Consultant, Gary, North Carolina
D. R. Frikken, Solutia, Inc., St. Louis, Missouri
G. R. Icenogle, Fisher Controls International, Inc., Marshalltown, Iowa
G. A. Jolly, Vogt Valve Co., Louisville, Kentucky
R. J. Kiessel, Consultant, Livingston, Texas
W. G. Knecht, BW/IP International Inc., Williamsport, Pennsylvania
M. L. Nayyar, Bechtel Corp., Gaithersburg, Maryland

vii
F. R. O’Brien, Crane Pacific Valves, Long Beach, California
G. J. Paptzun, George J. Paptzun, PE, Lansdale, Pennsylvania
D. W. Rahoi, CCM 2000, Rockaway, New Jersey
H. R. Sonderegger, Grinnel Corp., Cranston, Rhode Island
F. C. Tsao, Department of Navy, Washington, DC.
M. D. Wasicek, ABS Americas, Houston, Texas

..
VI11
 CONTENTS

. ..
IntroductoryNotes .............................................................. 111

Foreword ....................................................................... V

StandardsCommitteeRoster...................................................... vii

1 Scope .................................................................... 1
2 Pressure-Temperature Ratings .............................................. 1
3 Size ...................................................................... 4
4 Marking .................................................................. 4
5 Materials ................................................................. 5
6 Dimensions ............................................................... 6
7 PressureTesting ........................................................... 10
8 Requirementsfor SpecialClass Valves ..................................... 11

Figures
1 Method of DesignatingLocation of Auxiliary ConnectionsWhen
Specified ............................................................... 14
2 Thread Length for Auxiliary Connections................................... 15
3 Socket Welding for Auxiliary Connections.................................. 15
4 Butt Welding for Auxiliary Connections.................................... 16
5 Bossesfor Auxiliary Connections .......................................... 16
6 Gate Body (PressureSeal Bonnet) ......................................... 17
7 Y PatternGlobe Body (PressureSeal Bonnet) ............................... 17
8 Angle Body (PressureSeal Bonnet) ........................................ 18
9 Elbow Down (PressureSeal Bonnet) ....................................... 18
10 Gate Body (FlangedBonnet) ............................................... 19
11 Globe Body (FlangedBonnet) ............................................. 19
12 Butterfly Body ............................................................ 20
13 Plug Body ................................................................ 20
14 Conduit Gate Body (PressureSeal Bonnet) ................................. 21
15 Dished Cover ............................................................. 21
16 Flat Cover ................................................................ 21
17 Butterfly Valve Body ...................................................... 22

Tables
1 Material SpecificationList ................................................. 23
2 Pressure-Temperature Ratings .............................................. 31
3 Valve Body Minimum Wall Thicknessr,, in. ............................... 89
4 Minimum Wall Thicknessfor Socket Welding and ThreadedEnds ........... 92

Annexes
A RelationshipBetween Nominal Pipe Size and Inside Diameter ............... 93
B RadiographyProcedureand AcceptanceStandards........................... 95
C Magnetic Particle ExaminationProcedureand AcceptanceStandards.......... 97
D Liquid PenetrantExaminationProcedureand AcceptanceStandards........... 99

ix
 E UltrasonicExaminationProcedureand AcceptanceStandards................. 101
F Methodsfor EstablishingPressure-Temperature Ratings ..................... 103
G Requirementsfor Limited Class Valves ..................................... 109
H Quality System Program ................................................... 113
I ReferenceStandardsand Specifications..................................... 115

Interpretations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
 ASME 616.34a-1998

VALVES - FLANGED, THREADED, AND WELDING END

1 SCOPE edition have been met. However, where such compo-

nents were installed under the pressure temperature
1 .I General ratings of an earlier edition of ASME B16.5 or ASME
B16.34, those ratings shall apply except as may be
This Standard applies to new valve construction
governed by an applicable Code (see para. 1.2.2)
and covers pressure-temperature ratings, dimensions,
tolerances, materials, nondestructive examination re- 1.2.4 User Accountability. This Standard cites
quirements, testing, and marking for cast, forged, and duties and responsibilities that are to be assumed by
fabricated flanged, threaded, and welding end and wafer the valve user in the areas of, for example, application,
or flangeless valves of steel, nickel-base alloys, and installation, system hydrostatic testing, operation, and
other alloys shown in Table 1. Wafer or flangeless material selection.
valves, bolted or through-bolt types, that are installed
between flanges or against a flange shall be treated as 1.2.5 Quality Systems. Requirements relating to
flanged-end valves. Alternative rules for small valves the valve manufactures Quality System Programs are
(NPS 21/2 and smaller) are given in Annex G. described in nonmandatoryAnnex H.

1.2 Applicability 1.3 Service Conditions

1.2.1 Standards and Specifications. Standards Criteria for selection of valve types and materials
and specifications adopted by reference in this Standard suitable for particular fluid service are not within the
and the names and addressesof the sponsoring organiza- scope of this Standard.
tions are shown in Annex I. It is not considered practical
to refer to a specific edition of each of the standards 1.4 Convention
and specifications in the individual references. Instead, For the purpose of determining conformance with
the specific edition references are included in Annex this Standard, the convention for fixing significant digits
I. A product made in conformance with a prior edition where limits, maximum and minimum values, are speci-
of reference standardsand in all other respectsconform- fied shall be “rounding off” as defined in ASTM
ing to this Standard will be considered to be in confor- Practice E 29. This requires that an observed or calcu-
mance even though the edition reference may have lated value shall be rounded off to the nearest unit in
been changed in a subsequentrevision of this Standard. the last right-hand digit used for expressing the limit.
Decimal values and tolerance do not imply a particular
1.2.2 Codes and Regulations. A valve used un-
method of measurement.
der the jurisdiction of the ASME Boiler and Pressure
Vessel Code, the ASME Code for Pressure Piping, or
governmental regulations is subject to any limitation 2 PRESSURE-TEMPERATURE RATINGS
of that code or regulation. This incudes any maximum
temperature limitation for a material or rule governing 2.1 General
the use of a material at a low temperature.
Pressure-temperature ratings are designated by class
1.2.3 Time of Purchase, Manufacture, or In- numbers. Each class number is further identified as
stallation. The pressure-temperature ratings included Standard, Special, or Limited Class. Ratings are tabu-
in this Standard are applicable, upon its publication, lated in Tables 2 for Standard and Special Class 150,
to all valves covered within its scope which otherwise 300, 400, 600, 900, 1500, 2500, and 4500. Ratings
meet its requirements. For unused valves, valves that for Limited Class are determined by the method of
have been maintained in inventory, the manufacturer Annex G.
may certify conformance to this edition provided that (a) Flanged end-valves shall be rated only as Stan-
it can be demonstrated that all requirements of this dard Class.
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

(b) Class 4500 applies only to welding end-valves. Limited Class valves may be assigned using pressure-
(c) A class designation greater than Class 2500 or temperature ratings as determined by the method de-
a rating temperature greater than 1000°F applied to scribed in Annex G in conjunction with the interpolation
threaded-end valves is beyond the scope of this Standard. procedure described in para. 6.1.4.
(d) Threaded and socket welding-end valves larger
than NPS 2’/2 are beyond the scope of this Standard. 2.1.5 Valves Fabricated by Welding. A valve
(e) Except as provided in para. 2.5, the tabulated made wholly or partly from segments of castings,
ratings are the maximum allowable working pressures, forging, bars, plates, or tubular product welded together
expressed as gage pressure, at the temperatures shown. will merit the applicable ratings only if:
(f> Ratings intermediate to tabulated values are deter- (a) it conforms to all applicable requirements of this
mined by linear interpolation between temperatures Standard;
within a class number or between class numbers, except (b) weld fabrication and heat treatment of welds are
that for flanged-end valves interpolation between tabu- in accordance with the ASME Boiler and Pressure
lated classes is not permitted. Vessel Code, Section VIII, Division 1;
(a) (g) In all cases, valves shall be constructed so that (c) nondestructive examination of welds is in accord-
the body, bonnet or cover, body bolting, and bonnet ance with the ASME Boiler and Pressure Vessel Code.
or cover bolting meet the 100°F pressure rating require- Section VIII, Division 1, as required to warrant a joint
ments for the designated pressure class or pressure- efficiency E not less than:
temperature rating. However, pressure-temperature rat- (I) 0.80 for flanged-end and Standard Class weld-
ings for the valve may be otherwise limited by construc- ing-end valves larger than size NPS 6;
tion details or materials considerations, in which case (2) 1.OOfor Special Class welding-end or threaded-
the requirements of paras. 4.3.3 and 7.2.3 shall be met. end valves in all sizes (see para. 8.3.3).
These requirements are not applicable to seal welds
2.1 .l Standard Class Valves. Valves conforming or attachment welds such as for backseat bushings,
to the requirements of this Standard, except for those seat rings, lifting lugs, and auxiliary connections.
meeting the additional requirements of Section 8 for
Special Class valves or of-Annex G for Limited Class
2.2 Rating Temperature
valves, shall be designated Standard Class valves. Rat-
ings shall not exceed the values shown in those Tables The temperature shown for a corresponding pressure
2 having an identifying suffix “A”. rating is the temperature of the pressure-containing
shell of the component. In general, this temperature is
2.1.2 Special Class Valves. Threaded- or weld-
the same as that of the contained fluid. Use of a
ing-end valves which conform to all the requirements
pressure rating corresponding to a temperature other
of para. 2.1.1, and in addition have successfully passed
than that of the contained fluid is the responsibility of
the examinations required by Section 8, may be desig-
the user, subject to the requirements of applicable codes
nated Special Class valves. Ratings shall not exceed
and regulations.
the values shown in those Tables 2 having an identifying
suffix “B”. Special Class ratings shall not be used
for flanged-end valves. 2.3 Temperature Effects

2.1.3 Limited Class Valves. Welding- or Some considerations of the effect of temperature in
threaded-end valves in sizes NPS 2’/2 and smaller that application are given below. Additional guidance can
conform to the requirements of Annex G may be be found in ASME B16.5 as related to line flange
designated Limited Class valves. Ratings shall not joints.
exceed the values calculated in accordance with Annex
2.3.1 High Temperature. Application at tempera-
G. Limited Class ratings shall not be used for flanged-
tures in the creep range will result in decreasing bolt
end valves
loads as relaxation of flanges, bolts, and gaskets takes
2.1.4 Intermediate Rated Valves. A welding- place. Flanged joints subject to thermal gradients may
or threaded-end valve may be assigned an intermediate likewise be subject to decreasing bolt loads. Decreased
pressure-temperature rating or Class, either Standard bolt loads diminish the capacity of the flanged joint
or Special, in accordance with para. 6.1.4, provided to sustain loads effectively without leakage. At elevated
all other applicable requirements of this Standard are temperatures, flanged joints, and in particular Class
met. Correspondingly, an intermediate rating or Class for 150, may develop leakage problems unless care is taken

2
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

to avoid imposing severe external loads or severe 2.5 Variances

thermal gradients.
Except as providedin paras.2.5.1, 2.5.2, and 2.5.3,
the ratingsare the maximumallowableworkingpressure
2.3.2 Low Temperature. For a materialshownin for the corresponding temperature.
Table 1, the pressurerating for serviceat any tempera-
ture below -20°F shall be no greater than the rating 2.5.1 Safety Valve, Relief Valve, or Rupture
shownin the table for -20°F. Some of the materials Disk Operation. Under conditionsof safety valve,
listed in Table 1, notably some carbon steels, may relief valve, or rupturedisk operation,the pressuremay
undergo a decreasein ductility when used at low exceed the rated pressurefor a valve furnishedunder
temperatures to suchan extentas to be unableto safely this Standardby no more than 10% of that definedby
resistshockloading,suddenchangeof stress,or high the pressure-temperature rating. Such conditionsare
stressconcentration.Some codes or regulationsmay necessarilyof limited duration.Pressureexcursionsin
requireimpacttestingfor applicationseven wheretem- excessof the aforementioned are solelythe responsibil-
peraturesare higher than -20°F. When such require- ity of the user.
ments apply, it is the responsibilityof the user to
ensure these requirementsare communicatedto the 2.5.2 Other Variances. Subjectinga valve to op-
manufacturerprior to the time of purchase. erating variances(transients)in excessof its rating is
solely the responsibilityof the user.
2.3.3 Fluid Thermal Expansion. Under certain
conditions,somedouble-seated valve designsare capa- 2.5.3 System Hydrostatic Tests. If valves con-
ble of sealingsimultaneously againstpressuredifferen- forming to this Standardare subjectedto hydrostatic
tial from the centercavity to the adjacentpipe in both pressuretestingof systemswith the valve in the closed
directions.A circumstancein which the center cavity positionat pressuresgreaterthan the 100°F rating,or,
is filled or partially filled with liquid and subjectedto if applicable,at pressuregreaterthanthe closedpressure
an increasein temperaturecan result in an excessive differentialshownon the valve identificationplate (see
buildup of pressurein the center cavity leading to para. 4.3.3), suchtestingwill be the responsibilityof
pressureboundary failure. An example is a piping the user. In the open position, valves installed in a
systemin which liquid from the condensing,cleaning, piping system may be subjectedto system tests as
or testingfluids accumulatesin the center cavity of a conditionsnot to exceed the hydrostaticshell test of
closedvalve. Suchaccumulationmay resultfrom leak- para. 7.1, providedthe user has determinedthat there
age past the upstreamseat of the valve. If, during are no functionallimitations,for example,restrictions
subsequentstartup,the valve is not relieved of the on actuatingdevicesor specialmaterialsof construction.
liquid by partial opening of the valve, or by some
other method,the retainedliquid may be heatedduring 2.6 Multiple Material Grades
warmup of the system. Where such a condition is
possible,it is the responsibilityof the userto provide, Material for valve bodies,bonnets,or cover plates
or requireto be provided,meansin design,installation, may meet the requirementsof more than one ASTM
or operationprocedureto assurethat the pressurein specificationor the requirementsof more than one
grade of an ASTM specificationlisted in Table 1. In
the valve will not exceedthat allowedby this Standard
for the attainedtemperature. either event, the pressure-temperature ratingsfor any
of thesespecifications or gradesmay be usedprovided
the requirementsof para. 5.1 are satisfied,the material
2.4 Guidance for the Use of Flanged Valve is markedin accordancewith para. 4.2.8, and account
Ratings is taken of para. 5.2.2.

Applicationof flanged-endvalves at either high or

2.7 Local Operating Conditions
low temperaturesor in a servicesubjectto rapid fluid
temperaturevariationsentailssomerisk of flangedjoint When a valve (or seriesof valves) is installedin a
leakage.Guidance,which is intendedto minimizethese piping systemthat operateswith differentpressures (or
risks,is providedin ASME B 16.5.Precautions regarding temperatures)on either side of the closed valve, it is
the bolting of raisedface flangesto cast iron flanges the responsibilityof the userto ensurethat the installed
are given in ASME B16.5. valve is suitablefor the highestof the rating require-

3
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

mentsconsideringcombinations
of pressureandtemper- 4.23 Rating. The valve body shallbe markedwith
ature. the numberthat correspondsto the pressureratingclass
designationexcept that Special Class,Limited Class,
IntermediateRated- StandardClassand Intermediate
3 SIZE Rated - SpecialClassvalves may insteadbe marked
with a specificrated pressureand temperature.
3.1 Nominal Pipe Size
4.2.4 Temperature. No temperaturemarkingsare
As applied in this Standard,the use of the phrase requiredexcept as indicatedin paras.4.2.3 and 4.3.3.
“nominal pipe size” is intendedto indicate that the
statednumberis usedfor purposesof pipe or flange- 4.2.5 Size. The nominal size identificationnumber
end connectionidentificationand is not necessarilythe shall be shown.
same as the valve inside diameter. The relationship
betweeninsidediameter(see para. 6.1.2) and nominal 4.2.6. Omission of Markings. On valves whose
pipe size is shownin Annex A. The abbreviationNPS size or shapelimits the body markings,they may be
is alsousedto indicatenominalpipe size.The reference omitted in the following order:
dimensionin Table 3 is the insidediameteras defined (a) size
in para. 6.1.2. (b) rating
(c) material
(d) manufacturer’sname or trademark
4 MARKING
4.2.7 Ring-Joint-End Flange. Valveshavingring-
joint-end flanges shall have the edge (periphery) of
4.1 General
each ring-joint-endflange markedwith the letter “R”
Except as may be modified herein, valves shall be and the corresponding ring-groovenumber(see ASME
marked as requiredin MSS SP-25 and shall include B 16.5).
the following requirements.
4.2.8 Multiple Material Marking. Material for
valve bodies, bonnets,and cover plates which meet
4.2 Identification Markings the requirementsfor more than one gradeof an ASTM
specification
listedin Table 1 may, at the manufacturer’s
4.2.1 Name. The manufacturer’snameor trademark
option,be markedwith more thanone of the applicable
shall be shown.
grade symbols.The grade symbolsshall be placed to
avoid confusionin identification.
4.2.2 Materials. Materials used for valve bodies,
bonnets,and cover plates shall be identified in the
following way. 4.3 Identification Plate
(a) Castvalvesshallbe markedwith the heatnumber
4.3.1 Attachment. An identificationplate that in-
or heat identification and symbols as given in the
cludesthe valve manufacturer’sname shall be secured
ASTM specificationto designatethe material grade.
to each valve.
(b) Forgedor fabricatedvalvesshallbe markedwith
theASTM specification number’andgradeidentification 4.3.2 Cold Working Pressure. The identification
symbol. When more than one material or grade of plate shallbe markedwith the applicablevalve pressure
materialsis used,each shall be identified.
rating at 100°F and the pressurerating classnumber.
(c) A manufacturer may supplement thesemandatory
material identificationswith his trade designationfor 4.3.3 Special Markings. Valves whose construc-
the material grade, but confusion with the marking tion limits use to less than the pressure-temperature
requiredherein shall be avoided. valuesfor the markedpressurerating classdesignation
shallindicatetheselimitationson theidentificationplate.
Examplesin this categoryare valvesusingelastomeric
’ The ASME Boiler and PressureVessel Code, Section II specification gasketsor seatingelements,valveswith closureelements
number may be substitutedprovided that the material under consider-
ation is covered by Section II. designedfor closurepressuredifferentialslower than
the basic rated pressureof the valve body, or valves

4
 VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

using carbon steel bonnet bolts such as ASTM A 307, previously refined metal of a single furnace charge.
Grade B. Tensile specimens shall be cast in molds of the same
refractory as the castings and shall be given the same
4.4 Conformity heat treatment as the castings. When investment castings
are used for sizes and pressure classes greater than
4.4.1 Designation. Valves conforming to Standard those described above, all the requirements of the
Class requirements shall include the designation applicable Table 1 ASTM specification shall be met.
“B 16.34” on the identification plate. For all Special
Class valves, the identification plate shall include the 5.1.3 Cast Surfaces. Cast surfaces of pressure
designation “B 16.34 SPL”. For all Limited Class boundary parts shall be in accordance with MSS SP-55.
valves, the identification plate shall include the designa-
tion “B16.34 LTD”. The use of the prefix “ASME” 5.1.4 Mechanical Properties. Mechanical proper-
to these designations is optional. ties shall be obtained from test specimens that represent
the final heat-treated condition of the material required
4.4.2 Compliance. The “B16.34” identification by the material specification.
marking of para. 4.4.1 designates that the valve was
manufactured in conformance with ASME B16.34. 5.2 Material Selection

5.2.1 Service Conditions. Criteria for the selec-

5 MATERIALS tion of materials are not within the scope of this
Standard. The possibility of material deterioration in
5.1 General service and the need for periodic inspections is the
responsibility of the user. Carbide phase conversion to
The body, bonnet or cover, body joint bolting, and
graphite, oxidation of ferritic materials, decrease in
body-bonnet or cover bolting, shall be constructed of
ductility of carbon steels at low temperature (even in
materials as listed in the respective ASTM specifications
applications above 20”F), and susceptibility to intergran-
referred to in Table 1. Identical materials in accordance
ular corrosion of austenitic materials or grain boundary
with the ASME Boiler and PressureVessel Code Section
attack of nickel-base alloys are among those items
II may also be used for these parts. It is not required
requiring attention by the user. A discussion of precau-
that identical material or material form be used for
tionary considerations can be found in Appendix F of
body and bonnet or cover parts. The rating applied,
ASME B3 1.3.
however, shall be based on the valve body. The bonnet
or cover shall be designed and material selected accord- 5.2.2 Responsibility. When service conditions dic-
ingly. Selection of stems, disks, and other parts, such tate the implementation of special material requirements,
as bonnet gaskets and bolting, subject to pressure and e.g., using a Group 2 material above lOOO”F, it is the
other loading, must be consistent with the applicable user’s responsibility to so specify to the manufacturer
valve pressure-temperature rating. in order to ensure compliance with metallurgical require-
ments listed in the end notes to Table 1 and the notes
5.1.1 Carbon Steel Bonnet or Cover Bolting.
in Table 2.
It is permissible to use carbon steel, for example,
ASTM A 307, Grade B, for bonnet or cover bolting
5.3 Electrical Continuity
only for Class 300 and lower, provided the service
temperature is limited to 400°F and marking is in Internal parts that are insulated from the valve body
accordance with para. 4.3.3. may build up a static electric charge. An example is
a ball valve with seats and seals of nonconductive
(a) 5.1.2 Investment Castings. When investment
materials. When service conditions require electrical
castings are used for bodies, bonnets, and cover plates
continuity to prevent static discharge, the user is respon-
of valves in sizes NPS 4 and smaller where the ratings
sible for specifying static grounding.
do not exceed Class 600, the requirements of the ASTM
specifications referred to in Table I shall be met, except
5.4 Flange Removal
that it is permissible to determine mechanical and
chemical properties from a master heat and to use a When an end flange is removed from a flanged-end
1 in. x 0.25 in. diameter tensile specimen in place of valve body casting to make a weld-end valve casting,
the standard 2 in. tensile specimen. A master heat is discontinuities may be observed that would not have

5
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

responsibility for the acceptability of the resultant weld- applicable to and measured from internally wetted
end valve casting. This responsibility includes pressure surfaces, e.g., up to the point where the body-bonnet
testing the resultant weld-end valve in accordance with seal is affected.
Section 7. Beyond the aforementioned 1.1 6 region, straight
circular sections of valve body necks with inside diame-
ter d’ shall be provided with local wall thickness at
6 DIMENSIONS
least equal to t’ where t’ is taken from the appropriate
(tabulated or intermediate) rating Class in Table 3 using
6.1 Body Dimensions
an appropriate diameter d”.
6.1.1 Wall Thickness. For inspection purposes,
the wall thickness of valve bodies at the time of
For rating of Class 150 to 2500:
manufacture shall be no less than the minimum values
t,,, shown in Table 3, except as indicated in paras.
6.1.3 through 6.1.7, 6.2, and 6.7. When using the table,
linear interpolation may be used for values intermediate
to those listed. The minimum thickness requirement
for the body wall is applicable only as measured from
internal wetted surfaces. Minimum wall thickness shall For ratings over Class 2500:
not include liners, linings, or cartridges.

6.1.2 Inside Diameter. For the purpose of de-

termining the wall thickness t,, the inside diameter d d”=$( ,,+&)
is taken as the minimum diameter of the flow passage
but not less than 90% of the basic inside diameter at
the valve end. For socket welding- and threaded-end
where P, is the pressure class designation as defined
valves, the socket or thread diameters and associated
in Annex F, para. F1.3.
counterbores or tapped bores need not be considered
(a) For the special case where d > 1.5d, it is
in establishing the value of d (see paras. 6.2.3 and
necessary that the wall thickness be equal to or greater
6.2.4). For the special case of valves used between
than t’ for the entire body neck length having diameter
high and low pressure sections of a system where an
d’, including the aforementioned 1.1 6 region.
end connection is specified for a thinner pipe wall (or
(b) For the special case of valve body necks having
lower class flange) on one end than on the other, the
a small diameter relative to the body run diameter,
inside diameter d shall be based on the end connection
that is, d/d 2 4 (for example, a butterfly valve stem
with the heavier pipe wall (or higher class flange).
penetration), the minimum local wall thickness within
Localized variations of inside diameter associated with
the region of t,,, (1 + 1.1 a);), measured starting from
transitions to weld preparations need not be considered.
Note, however, limitations of proximity of body neck the intersection of the body inside diameter and the
in para. 6.1.5. Where linings, liners, or cartridges are axis of the body neck diameter, shall be equal to t’
used to form the flow passage or portions of the flow where I is obtained from Table 3 using the appropriate
passage, the inside diameter d shall be that at the body neck inside diameter d’ and the appropriate pres-
liner-body interface. For inside diameters which lie sure class. This special case is illustrated in Fig. 16.
BETWEEN diameters for which minimum wall thick- Beyond the aforemention region of t, (1 + 1.1
ness is tabulated, tm may be determined by linear a), valve body necks shall be provided with local
interpolation. minimum wall thickness based on d”, in accordance
with para. 6.1.3.
6.1.3 Valve Body Necks. Valve body necks shall (c) For the special case of a body neck in which
maintain the minimum wall thickness as described in holes are drilled or tapped in the body neck wall
paras. 6.1.1 and 6.1.2 within a region of 1.1 a parallel with the body neck axis, it is required that
measured from the outside of the body run along the the sum of the ligaments at the inner and outer sides
neck direction. The diameter, d, is as defined in para. be equal to or greater than tm or t’, as applicable. The
6.1.2, and t,,, is the minimum wall thickness as shown inner ligament and the ligament at the bottom of the
in Table 3. Minimum wall thickness requirements are drill hole shall be no less than 0.25t,,, or 0.25t’, as

6
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

applicable. Furthermore, it is required that this thickness (c) Completed Ends. After the tests required by para.
shall extend for a length along the body neck, starting 7.1 have been completed, and at the manufacturer’s
at the top of the neck, at least equal to the depth of discretion, semifinished buttwelding ends may be ma-
the hole plus a distance equal to one-half of the hole chined to final dimensions, flange gasket seating surfaces
or bolt diameter. may be machined to a final surface finish or threaded
ends may be converted to socket welding ends, all
6.1.4 Welding or Threaded End Valves With without any additional pressure testing.
Intermediate Ratings. The intermediate pressure rat-
ing class designation, Prd, and minimum wall thickness, 6.1.6 Local Areas. Local areas having less than
t,,,,for threaded- or welding-end valves with intermediate minimum wall thickness will be acceptable provided
pressure ratings shall be determined by linear interpola- that all of the following limitations are satisfied.
tion. The method is illustrated in (a) and (b) below. (a) The area of subminimum thickness can be en-
(a) Enter the appropriate pressure-temperature rating closed b a circle whose diameter is no greater than
table of Tables 2 with the design temperature and 0.35 ?-d,t,). For valve body necks, use d,, = d’ and
working pressure Pd, and determine the pressure rating t,, = t’ (see para. 6.1.3). For all other local areas, use
PI, next below, and P2, next above Pd, where PI d, = d (see para 6.1.2) and t,, = t, (see para. 6.1.1 or
and P2 are ratings corresponding to pressure class 6.1.4, as appropriate);
designations P,, and Prz. Determine the intermediate (b) Measured thickness is no less than 0.75t,,;
pressure rating class designation, Prd, corresponding to (c) Enclosure circles are separated from each other
design conditions using by an edge-to-edge distance of no less than 1.75
a.
Prd = Prl + - (Pr* - P,,)
(P2 - PI) 6.1.7 Additional Metal Thickness. Additional
metal thickness needed, for example, for assembly
(b) Using the appropriate inside diameter, d, in Table
loads, actuating (closing and opening) loads, shapes
3, select the minimum wall thicknessestl and t2 corres-
other than circular, and stress concentrations, must be
ponding to pressure classes P,, and Pr2 respectively.
determined by individual manufacturers since these
Determine the minimum wall thickness, t,,,, correspond-
factors vary widely. In particular, inclined stem valves,
ing to design conditions using
intersections and openings in enlarged body cavities,
and some types of fabricated body valves may require
additional reinforcement to assure adequate strength
tm- - t1 + (prd
- prd(t2 - t,)
and rigidity.
(Pr2 - Prl)

6.1.5 Contours at Body Ends 6.2 End Dimensions

(a) Buttwelding Ends. The weld preparation (see
para. 6.2.1) shall not reduce the body wall thickness 6.2.1 Buttwelding Ends. Unless otherwise speci- (a)
to less than the values required by para. 6.1.1 or 6.1.4 fied, the details of the welding-end preparation shall
within a region closer to the outside surface of the be in accordance with ASME B16.25, with the inside
body neck than t,,, measured along the run direction. diameter (denoted as dimension B in ASME B 16.25)
The transition to the weld preparation shall be gradual having the following tolerance:
and the section must be essentially circular through (a) sizes NPS 10 smaller: 50.03 in.
the entire length of the transition. Sharp discontinuities (b) sizes NPS 12 to 18: 2 0.06 in.
or abrupt changes in sections that infringe into the (c) sizes NPS 20 and larger: +0.12, -0.06 in.
transition shall be avoided, except that test collars or In all cases, the thickness of the body run or nozzle
bands, either welded or integral, are allowed. In no transition (see para. 6.1.5) starting at a distance 1.33t,,
case shall the thickness be less than 0.77t, at a distance from the buttwelding end, shall be no less than 0.77t,,.
of 1.33t, from the weld end.
(b) Socket Welding and Threaded Ends. The distance 6.2.2 Flanged Ends. Flanged ends shall be pre-
from the center line of generally cylindrical flow pas- pared with flange facing, nut-bearing surfaces, outside
sages to the external surface of the body run shall be diameter, thickness, and drilling in accordance with
no less than 0.5 times the appropriate nominal pipe ASME B16.5 requirements for flanged fittings. When
outside diameter listed in ANSYASME B36.10M. required, end flanges may be furnished with tapped
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

holes for flange bolting. Thread engagement in a pipe procedure, both in accordance with ASME Boiler and
flange assembly with tapped holes shall provide full Pressure Vessel Code, Section IX.
effective thread engagement, not including the cham-
fered threaded, for a length at least equal to the nominal 6.3.2 Pipe Thread Tapping. Holes may be tapped
diameter of the thread. For additional considerations, in the wall of a valve if the metal is thick enough to
see para. 64.3. allow the effective thread length specified in Fig. 2.
Where metal thickness is insufficient or the tapped hole
6.2.3 Socket Welding Ends. The socket bore needs reinforcement, a boss shall be added as shown
diameter, depth of socket, and end surfaces shall be in Fig. 5.
in accordance with ASME B 16.11. The minimum thick-
6.3.3 Socket Welding. Sockets may be provided
ness of the socket wall extending over the socket
in the wall of a valve if the metal is thick enough to
depth, including any associated counterbore, shall be
accommodate the depth of socket and retaining wall
in accordance with Table 4.
specified in Fig. 3. Where the metal thickness is insuffi-
6.2.4 Threaded Ends. End connections shall have cient or the socket opening requires reinforcement, a
taper pipe threads in accordance with ANSVASME boss shall be added as shown in Fig. 5. The length
B 1.20.1. The minimum thickness of the wall extending of the leg of the attachment weld shall be not less
than 1.09 times the nominal pipe wall thickness of the
over the length of the thread, including any associated
tap bore or counterbore, shall be in accordance with auxiliary connection or 0.12 in., whichever is greater.
Table 4. Thread lengths and gaging requirements shall
6.3.4 Butt Welding. Auxiliary connections may
be in accordance with ASME B16.11.
be attached by butt welding directly to the wall of the
valve (see Fig. 4). Where the size of the opening is
6.2.5 Intermediate Rated Socket Welding-
such that reinforcement is necessary, a boss shall be
and Threaded-End Valves. The minimum socket
added as shown in Fig. 5.
wall thickness and the minimum threaded-end wall
thickness for valves with intermediate ratings may be 6.3.5 Bosses. Where bosses are required, the in-
determined by interpolation using the method of para. scribed diameters shall be not less than those shown
6.1.4(b) using wall thickness values from Table 4. in Fig. 5 and the height shall provide metal thickness
to satisfy the requirements of Fig. 2 or 3.
6.2.6 End to End. End-to-end dimensions and face-
to-face dimensions shall be in accordance with ASME 6.3.6 Size. Unless otherwise specified, auxiliary
B16.10 or other dimensions by agreement between connections shall be as follows:
manufacturer and purchaser. For some valve types, both
Valve Size, NPS Connection, NPS
long and short pattern dimensions are listed in ASME
Bl6.10. It should not be assumed that all designs of 2-4 '/2
the type listed can be accommodated in the short pattern 5-8 sh
10 and up 1
dimension series. For example, full port top entry ball
valves cannot, in all cases, be fitted to the short pattern
dimensions. For valves not included in ASME B16.10, 6.3.7 Designating Locations. A means of desig-
dimensions shall be the manufacturer’s standard. nating locations for auxiliary connections for some
valve types is shown in Fig. 1. Each of these locations
is designated by a letter so that the desired locations
6.3 Auxiliary Connections
for the illustrated types of valves may be specified
without using further sketches or description.
6.3.1 General. Auxiliary connections shall be de-
signed, fabricated, and examined so as to warrant at
least the same pressure-temperature ratings as the valve 6.4 Valve Joints
and shall be installed prior to the shell test of the Valves with bolted or threaded bonnet, cover, or body
valve to which they are attached, except that upon joints shall meet the requirements of this subsection.
agreement between the manufacturer and purchaser,
auxiliary connections installed after the valve shell tests 6.4.1 Bonnet or Cover Joints. Valve bonnet or
are acceptable. Welded auxiliary connections shall be cover joints are joints that are not subject to direct
made by a qualified welder using a qualified welding piping loads.

8
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34+1998

(a) Bolted Bonnet or Cover Joints. Bolting shall be specified service conditions. Since these factors vary
threaded in accordance with ANSI B1.l and, as a widely, these requirements must be determined by
minimum, shall satisfy the following bolt cross-sectional individual manufacturers.
area requirements:

P, 1 I 0.45s” I 9000 6.5 Stems

Special consideration for stems for certain valve

(b) Threaded Bonnet or Cover Joints. Thread shear types shall be as follows.
area, as a minimum, shall satisfy the following.
6.5.1 Stem Retention. Valves shall be designed
PC4
As s4200 so that the stem seal retaining fasteners (e.g., packing
gland fasteners) alone do not retain the stem. Specifi-
cally, the design shall be such that the stem shall not
where be capable of removal from the valve, while the valve
s, = allowable bolt stress at lOO”F, psi (when is under pressure, by the removal of the stem seal
greater than 20,000 psi, use 20,000 psi) retainer (e.g., gland) alone.
P, = pressure rating class designation, psi (see
Annex F, para. F1.3)
6.5.2 Position Indication. Valves of the quarter-
A, = area bounded by the effective outside periphery
turn type (e.g., ball, plug, or butterfly) shall have a
of a gasket or O-ring or other seal effective
means to indicate the ball, plug, or disk position. The
periphery, except that in the case of a ring-
design shall be such that the components of the indicat-
joint the bounded area is defined by the pitch
ing means cannot be assembled to falsely indicate the
diameter of the ring, sq in.
valve open or closed position.
Ab = total effective bolt tensile stress area, sq in.
A, = total effective thread shear area, sq in.
The allowable stress values shall be taken from the 6.6 Installation Limitations
ASME Boiler and Pressure Vessel Code, Section VIII,
Division 1, or Section III, Division 1, Class 2 or Class 3. 6.6.1 Single Flange Installation. Flanged and
wafer or flangeless valves are intended for installation
6.4.2 Body Joints. Valves with bodies of sectional between flange pairs. These valves, however, can also
construction such that bolted or threaded body joints be designed for installation against a single flange for
are subject to piping mechanical loadings shall, as a the purpose of effecting closure in dead-end piping.
minimum, satisfy the following requirements. valves for the latter service shall be designed such
(a) Bolted Body Joints. Bolted body joints shall use that all parts which are necessary to support pressure
bolting threaded in accordance with ANSI B 1.l and loads acting across the seating element safely support
shall, as a minimum, satisfy the following bolt cross- the maximum differential pressure rating of the valve.
sectional area requirement. Examples of such parts are end entry threaded seat
retaining ferrules of ball valves and bolted seat seal
P, 1 I 0.35s, I 7000 retaining plates of butterfly valves. In the event that
the valve design cannot accommodate these pressure
loads, then the valve shall be marked to show such
(b) Threaded Body Joints. Threaded body joints shall,
installation restriction.
as minimum, satisfy the following thread shear area
requirement.
6.6.2 Disk Clearance. Valves that can be bolted
between flanges or against a flange (e.g., butterfly or
P, + 2 3300
swing check valves) may have a disk that will, upon
rotation, project beyond the plane of the flange gasket.
6.4.3 Additional Considerations. Bolting or The valve design shall be such that there will be no
threading in excess of the minimum requirements of interference between the valve disk and companion
this Standard may be required because of valve design, flanges or adjacent piping for the following pipe
special gasket compression requirements, or special schedules.

9
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

Pressure Class Valve Size, NPS Pipe Schedule next higher 25 psi increment. The test shall be made with
150 2-24 40 water, which may contain a corrosion inhibitor, with kero-
300 2-24 80 sene, or with other suitable fluid,’ provided such fluid has
600 2-6 80 viscosity not greaterthan that of water, at a temperaturenot
600 8-14 100
above 125°F. Visually detectableleakagethroughpressure
boundary walls is not acceptable.Test duration shall be not
For other valve sizes and pressureclasses,pipe inside less than shown below.
diameter and disk clearance shall be as agreed between
manufacturer and purchaser. Valve Size, NPS Test Time, set

2 and smaller 15
(a) 6.7 Wafer or Flangeless Valves 2.5-8 60
10 and larger 180
The design of valves that can be bolted between
flanges or against a flange (e.g., butterfly valves) shall Test shall be made with the valve in the partially
conform to the applicable requirements for flanged open position. Leakage through the stem packing shall
valves and the requirements of (a) through (g) below not be cause for rejection, however, stem seals shall
(see Fig. 17). be capable or retaining pressure at least equal to the
(a) The design shall provide for boltup using all of 100°F ratings without visible leakage.
the bolt holes and bolt circle of the specified flange.
(b) Bolt holes, parallel to the body run, may be
7.2 Valve Closure Tests3
either threaded or unthreaded. Threaded holes may be
blind holes suitable for use with bolt studs. When Each valve designed for shut-off or isolation service,
threaded, full-thread engagement, excluding chamfers, such as a stop valve, and each valve designed for
shall be provided to a depth not less than one nominal limiting how reversal, such as a check valve, shall be
bolt diameter. given a closure test. The test thud shall be as in para.
(c) The required minimum valve body wall thickness 7.1. The test pressure shall be not less than 110% of
rmshall be measured from the valve body inside circum- the 100°F rating except that, at the manufacturer’s
ference out to the lesser of the valve body outside option, a gas closure test at gage pressure not less
circumference or the circumference of a circle inscribed than 80 psi may be substituted for valve sizes and
through the inner tangent points to the flange bolt holes. pressure classes shown below.
(d) The inner ligament (e of Fig. 17) of either a
through-hole or a blind threaded hole in the vicinity Valve Size, NPS Pressure Class

of a stem penetration shall not be less than 25% of 12 and smaller 400 and lower
the required wall thickness of body neck but in no 4 and smaller All
case less than 0.1 in.
(e) The inner ligament (f of Fig. 17) for holes The closure test shall follow the shell test except
parallel to the body run shall not be less than 0.23, that for valves NPS 4 and smaller with ratings Class
but in no case less than 0.1 in. The sum of the inner 1500 and lower the closure test may precede the shell
and outer ligaments shall not be less than t,,,. test when a gas closure test is used. The closure test
(fl A ligament within the minimum body wall be- duration shall be not less than shown below.
tween two adjacent holes within the minimum body
Valve Size, NPS Test Time, set
wall (j of Fig. 17) shall be 0.29, or greater but not
less than 0.1 in. 2 and smaller 15
2’/2-8 30
(a) lo-18 60
20 and larger 120

7 PRESSURE TESTING
* There are hazards involved when gas is used as the fluid for testing.
(a) 7.1 Shell Test Appropriate precautions are required when a gas is used.
3 Clcsure tightnessrequirementsvary with intended service application
Each valve shall be given a shell test at a gage pressure and are not considered to be within the scope of this Standard. For
no less than 1.5 times the 100°F rating, rounded off to the guidance in this regard see, for example, MSS SP-61 or API-598.

10
VALVES - FLANGED
THREADED, AND WELDING END ASME B16.34-1996

The test time is the period of inspection after the (a) internal linings or coatings included in the design,
valve is fully prepared and is under full pressure. e.g., nonmetal butterfly valve linings, are permitted;
(b) chemical corrosion protection treatment is permit-
7.2.1 Double Seating. For valves of the double ted; and
seating type, such as most gate and ball valves, the (c) assembled valves having bodies and bonnets or
test pressure shall be applied successively on each side cover plates that have been separately tested in accord-
of the closed valve. As an alternate method, for valves ance with para 7.1, prior to having been painted or
with independent double seating (such as double disk coated, may be painted or coated prior to final testing
gate valves), the pressure may be applied inside the in accordance with para. 7.1.
bonnet or body with the disks closed.

7.2.2 Directional Seating. For other valve types, 8 REQUIREMENTS FOR SPECIAL CLASS
the test pressure shall be applied across the closure VALVES
member in the direction producing the most adverse
seating condition. For example, a globe valve shall be 8.1 Scope
tested with pressure under the disk. A check valve,
globe valve, or other valve type designed to be sold This Section defines the nondestructive examination
and marked as a one-way valve requires a closure test (NDE) requirements and the rules for defect removal
only in the appropriate direction. and repair for cast, forged, rolled, wrought, and fabri-
cated valve bodies and bonnets or covers which are
7.2.3 Restricted Seating. Valves conforming to intended for use in Special Class valves.
this Standard in all respects, except that they are
designed for operating conditions that have the pressure 8.2 General
differential across the closure member limited to values
less than the 100°F pressure rating and have closure These examinations are to be performed on the cast,
members and/or actuating devices (direct, mechanical, rolled, wrought, forged, or fabricated material after heat
fluid, or electrical) that would be subject to damage treatment required by the material specification either
at high differential pressures,shall be tested as described prior to or after the finish machining at the option of
above except that the closure test requirement may be the manufacturer. Surfaces shall be clean and free
reduced to 110% of the maximum specified closed of surface conditions which may mask unacceptable
position differential pressure. This exception may be indications. Accessible surfaces (see paras. 8.3.1.2, and
exercised as agreed between the user and manufacturer. 8.3.2.2) do not include threads, drilled or threaded
The manufacturer’s nameplate data shall include refer- holes, for example, for bolting, packing, stems, or
ence to any such limitations (see para. 4.3.3).4 auxiliary connections.

7.3 Leakage Detection Devices 8.3 Required Examination

Leakage detection devices, e.g., pressure decay de- 8.3.1 Castings

vices, may be used for detecting leakage provided that
8.3.1.1 Radiographic Examination. Body and
they are used at the pressures required for the shell
bonnet or cover sections requiring radiography are as
and closure tests of paras. 7.1 and 7.2. When used,
given below and as shown typically in Figs. 6 through
the valve manufacturer shall have demonstrated that
16. For body and bonnet configurations not represented,
the test results are equivalent to the requirements of
it is permissible to construct a composite coverage area
paras. 7.1 and 7.2.
based on these illustrations and the descriptions that
follow. The distance A over which film coverage is
7.4 Surface Protection
required, is expressed in multiples of r,,, where r,,, is
Valves shall not be painted or otherwise coated with the minimum wall requirement as determined by para.
materials capable of sealing against leakage before the 6.1. The value of A is intended to be greater of 3f,
shell tests are completed except that: or 2.75 in. It should be recognized, however, that in
some cases the specified value of A will exceed the
intent of the film coverage area as illustrated in Figs.
4 Performance testing of valve actuating devices is not within the scope
of this Standard. 6 through 16. For example, in Fig. 11 the body neck
or run sections may not accommodate the full value

11
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

of A as defined. In such casesthe requirementmay 8.3.2 Forgings, Bars, Plates, and Tubular
be satisfiedby providingfilm coveragesubstantially as Products
shownin the sketches.Also, if the full definedcoverage
width A would resultin the film runningsubstantially 8.3.2.1 Ultrasonic or Radiographic Examina-
into an adjacentfillet or crotch section,the value of tion. The following sectionsshall be ultrasonically
A may be reducedto a practicalmaximumvalue.Small examinedin accordancewith procedureand acceptance
variationsin coverage are permitted when necessary standardsin Annex E or radiographicallyexaminedin
to accommodatestandardfilm sizes.The radiographic accordancewith procedureand acceptancestandards in
proceduresand acceptancestandardsto be used shall Annex B.
be in accordancewith Annex B. (a) Body - cylindrical sectionsat run ends and
body neck.
(4 Body
(b) Bonnet - ring section excluding stuffing box
(I) a band aroundeach weld end extendingback
and yoke arms
from the body end a distanceequal to the greaterof
(c) Cover
3t, or 2.15 in.;
(I) volumetricexaminationis not requiredfor flat
(2) a bandaroundthe bonnetneckextendingdown
covers with or without raised faces;
from the top of body on pressureseal valvesand from
(2) for dished covers, a band in the vicinity of
back of flangeon boltedbonnetvalvesa distanceequal
the junction betweenthe dished and flanged sections
to the greater of 3t,,, or 2.75 in.;
having a width equal to the greaterof 3t, or 2.75 in.
(3) a band in the area of the junction between
If, during the examination,ultrasonicindicationsare
each seat and body shell having a width equal to the noninterpretabledue to grain size, the material shall
greaterof 3t,,, or 2.75 in. and an encompassing girth
be radiographedusing the procedurerequirementsof
extendingbetweenthe fillets of the intersecting
sections, para. 8.3.1.1. Subsurfacelinear indicationsexceeding
e.g., as shownapproximately210 deg for Fig. 6. 0.19 in. long in sectionsunder 0.5 in. thick, 0.38 in.
(b) Bonnet. The junction of the stuffing box with long in sections0.5 to 1 in. thick, or 0.75 in. long in
the bonnet closureplate or flange. sectionsover 1 in. thick are unacceptable.
(c) Cover
(I) volumetricexaminationis not requiredfor flat 8.3.2.2 Surface Examination. All exterior and
covers with or without raised faces; accessibleinterior surfacesof bodies, bonnets, and
(2) for dished covers, a band in the vicinity of covers shall be given a surfaceexamination.Group 1
the junction betweenthe dished and flanged sections materials(Table 1) shall be given either a magnetic
having a width equal to the greaterof 3t, or 2.75 in. particleexaminationor a liquid penetrantexamination.
Groups 2 and 3 materials(Table 1) shall be given a
8.3.1.2 Surface Examination. All exterior and liquid penetrantexamination.Magneticparticleexami-
accessibleinterior surfacesof body, bonnet,and cover nationsshall be in accordancewith the procedureand
castingsshall be given a surfaceexamination.Group acceptancestandardsof Annex C. Liquid penetrant
1 materials(Table 1) shall be given either a magnetic examinationsshallbe in accordancewith the procedure
particleexaminationor a liquid penetrantexamination. and acceptancestandardsof Annex D.
Groups 2 and 3 materials(Table 1) shall be given a
liquid penetrantexamination.Magneticparticleexami- 8.3.3 Welded Fabrication. Bodies and bonnets
nationsshall be in accordancewith the procedureand madeby weld assemblyof segmentsof castings,forg-
acceptancestandardsof Annex C. Liquid penetrant ings, bars,tubularproducts,or plates,or combinations
examinationsshallbe in accordancewith the procedure thereof,shallbe examined,asapplicable,by the methods
and acceptancestandardsof Annex D. of para. 8.3.1 for cast components,or para. 8.3.2 for
forged, rolled, or wroughtcomponents.In addition,all
8.3.1.3 Ultrasonic Examination. An ultrasonic fabricationweldsshallreceivenondestructive examina-
examinationof the casting in accordancewith para. tion in accordancewith the ASME Boiler and Pressure
8.3.2.1 may be substituted for the radiographic
examina- Vessel Code, Section VIII, Division 1, in a manner
tion, providedthat the user agreesand that it can be that resultsin a weld joint efficiency of 1.0. (These
demonstrated that the ultrasonicexaminationproduces requirementsare not applicableto welds such as for
interpretableresults.The extent of coverageshall be backseatbushings,seatrings,lifting lugs,and auxiliary
as typically shownin Figs. 6 through 16. connections.)

12
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

8.4 Defect Removal and Repair tion welds including groove, fillet, and circumferential
butt welds also apply to repair welds. Postweld heat
8.4.1, Defect Removal. Defects in excessof accept- treatment (solution treatment) of repair welds in austen-
ance standards shall be removed by suitable means. If itic stainless steels is neither required nor prohibited
removal of surface defects to an acceptable level does except when required by the material specification.
not result in reducing wall thickness below an acceptable (d) The repaired area is reexamined by the NDE
value, the area shall be blended smoothly into sur- method which originally disclosed the defect. The reex-
rounding surface. amination by magnetic particle or liquid penetrant meth-
ods of a repaired area originally disclosed by magnetic
particle or liquid penetrant examination shall be per-
8.4.2 Repair by Welding. Where defect removal formed after postweld heat treatment when postweld
results in a wall thickness below an acceptable value, heat treatment is performed. The reexamination by
resultant cavity may be repaired by welding, provided radiography or ultrasonic methods of a repaired area
that all of the following requirements are satisfied. originally disclosed by radiography or ultrasonic exami-
(a) The welding procedure and welding operator are nation may be performed either before or after postweld
qualified in accordance with ASTM A 488 or the heat treatment when postweld heat treatment is per-
ASME Boiler and Pressure Vessel Code, Section IX. formed. The acceptance standards shall be as in the
(b) Weld repairs to fabrication welds are made in original examination.
accordance with the ASME Boiler and Pressure Vessel (e) Weld repairs made as a result of radiographic
Code, Section VIII, Division 1. examination shall be radiographed after welding. The
(c) Weld repairs are heat treated in accordance with acceptance standards for porosity and slag inclusion in
the postweld heat treatment requirements of the ASME welds shall be in accordance with the ASME Boiler
Boiler and PressureVessel Code, Section VIII, Division and Pressure Vessel Code, Section VIII, Division 1,
1, Subsection C. The exemptions applicable to fabrica- uw-5 1.

13
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

lb) Check Valve (~1 Ball Valve

la) Gate Valve

Aanb B G
‘

ld) Angle Valve le) Globe Valve

GENERAL NOTE:
The above sketches represent valves with symmetrical shapes. Sketches are illustrative only and do not imply design (see
pare.
6.3.7)

FIG. 1 METHOD OF DESIGNATING LOCATION OF AUXILIARY CONNECTIONS WHEN SPECIFIED

14
VALVES - FLANGED
THREADED, AND WELDING END ASME 616.34-1996

Conn. Size, NPS 3/s h

‘ % 1 I’/4 1% 2
Length of Thread, T, in. [Note (I )I 0.41 0.53 0.55 0.68 0.71 0.72 0.76

NOTE:
(1) In no case shall the effective length of thread, T, be less than that shown in table above.
These lengths are equal to the effective thread length of American National Standard External
Pipe Threads fANSI/ASME B. 1.20.1).

FIG. 2 THREAD LENGTH FOR AUXILIARY CONNECTIONS

(See Para. 6.3.2)

0.06 in. min.

Conn. Size, NPS 3/a 1

‘2 % 1 1 /‘r 11‘2 2
Min. Diam. of Socket A, in. 0.690 0.855 1.085 1.330 1.675 1.915 2.406
Min. depth of socket B, in. 0.19 0.19 0.25 0.25 0.25 0.25 0.31

FIG. 3 SOCKET WELDING FOR AUXILIARY CONNECTIONS

(See Para. 6.3.3)

15
 VALVES - FLANGED,
ASME 616.34-1996 THREADED, AND WELDING END

FIG. 4 BUTT WELDING FOR AUXILIARY CONNECTIONS

(See Para. 6.3.4)

t--J--l

Conn. Size, NPS =/a 1

‘2 a/4 1 1% 1% 2
Diam, of Boss J, in. 1.25 1.50 1.75 2.12 2.50 2.75 3.36

FIG. 5 BOSSES FOR AUXILIARY CONNECTIONS

(See Para. 6.3.5)

16
VALVES - FLANGED
THREADED, AND WELDING END
ASME 816.34-1996

TYPICAL CASTING SECTIONS SHOWING REQUIRED

RADIOGRAPHIC EXAMINATION

A = the greater of
3 t, or 2% in.
(See para 6.3.1.1.1

Section X-X Bonnet

FIG. 6 GATE BODY (PRESSURE SEAL BONNET)

Bonnet

FIG. 7 Y PATTERN GLOBE BODY (PRESSURE SEAL BONNET)

17
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

f-
A

,.
A

-! Section X-X and Y-Y

FIG. 8 ANGLE BODY (PRESSURE SEAL BONNET)

Bonnet Same As Y Pattern Globe

Section X-X

FIG. 9 ELBOW DOWN (PRESSURE SEAL BONNET)

18
VALVES - FLANGED
ASME 816.34-1996
THREADED, AND WELDING END

Section X-X Bonnet

FIG. 10 GATE BODY (FLANGED BONNET)

f
A

FIG. 11 GLOBE BODY (FLANGED BONNET)

19
 VALVES - FLANGED,
ASME 616.34-1996 THREADED, AND WELDING END

Section X-X A 4-J

FIG. 12 BUTTERFLY BODY

-
G- Section W-W and Z-Z

Section X-X and Y-Y

FIG. 13 PLUG BODY

20
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

i
A

A
-I
A
7
33 deg.
\
-- t

30 deg.

Section X-X

FIG. 14 CONDUIT GATE BODY (PRESSURE SEAL BONNET)

FIG. 15 DISHED COVER FIG. 16 FLAT COVER

21
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

Blind axial hole

other than
flange bolt
holes -

- Stem bore
Blind axial hole---\

Relationship Reference

t> tm 6.1.1 [Note (2)]

m > t’, 6.1.3(b) [Note (2)]
n t t’* 6.1.3(b) [Notes (2) and (3)]
L.2 f,(l + 1.1 m 6.1.3(b)
f 2 0.25 tm [Note (I)] 6.7(e)
f+g>t, 6.7(e)
f’ 2 0.25 t’2 [Note (I)] 6.1.3(c)
P + g’ > f’* 6.1.3(c)
c > 0.75 tm 6.7(g)
j 2 0.25 tm [Note (I)] 6.7(f)
et 0.25 t’t [Note (I)] 6.7(d)
NOTES:
(I) In no case less than 0.1 in.
(2) Except where para. 6.1.6 applies.
(3) If d’z is located outside of the stem seal, i.e., beyond the internal
wetted perimeter, the minimum thickness requirements shall be de-
termined by the manufacturer.

(4 FIG. 17 BUTTERFLY VALVE BODY

22
(4 TABLE 1 MATERIAL SPECIFICATION LIST
Applicable ASTM Specification
GROUP 1 MATERIALS
Material Product Form

Forgings Castings Plates B

Group Nominal Spec. Spec. Spec. Spec.

No. Designation No. Grade No. Grade No. Grade No.

C A675
1.1 C-Si A 105 A216 WCB A515 70 A 105
C-M n-Si A 350 LF2 A516 70 A 350
A 537 Cl. 1 A 696
C-M n-Si-V A 350 LF6 Cl.1

C-Si
1.2 2’/xNi A 352 LC2 A 203 B
3%Ni A 350 LF3 A 352 LC3 A203 E A 350
C-M n-Si A 216 WCC
A 352 LCC
C-M n-Si-V A 350 LF6 Cl.2

C A 675
1.3 C-Si A515 65
2%Ni A203 A
3%Ni A 203 D
C-Mn-Si A516 65

A675
1.4 C-Si A515 60

C-M n-Si A516 60 A 350

A 696

1.5 C-%Mo A 182 Fl A 217 WC1 A 204 A A 182

A 352 LCI A 204 B

C-‘/*MO
1.6
l/&r-l/~Mo

1Cr-‘/zMo

C-‘/zMo
1.7 1/2Cr-1/zMo A 182 F2 Al82
Ni-‘/2Cr-‘/zMo A 217 WC4
3/4Ni-Mo-3/&r A 217 WC5

(Table 1 continues on the next page)

 (4 TABLE 1 MATERIAL SPECIFICATION LIST (CONT’D)
Applicable ASTM Specification
GROUP 1 MATERIALS (CONT’D)
Material Product Form

tL Forgings Castings Plates

Group Nominal Spec. Spec. Spec. Spec.

No. Designation No. Grade No. Grade No. Grade No.

1Cr-‘/*MO A 387 12 Cl. 2

1.8

1/‘Jr-‘/*MO-Si A 387 11 Cl. 1

2’/&r-1 Mo A 387 22 Cl. 1

1 Cr-%Mo A 182 F12 Cl. 2 A 182

v 1.9 1l/aCr-l/pMo-Si A 182 Fll Cl. 2 A 387 11 Cl. 2 A 182
l’hC~-~/~Mo A 217 WC6 A 739

2’/&r-1 MO A 182 F22 Cl. 3 A 217 WC9 A 387 22 Cl. 2 A 182

1.10 A 739
-
3Cr-1 Mo A 182 F21 A 387 21 Cl. 2 A 182
1.11 Mn-‘/*MO A 302 A&B
Mn-sV2Mo-‘/~Ni A 302 C
Mn-1/2Mo-3/4Ni A 302 D
C-M n-Si A 537 CL2

5Cr-1/zMo A 387 5CI. 1

1.12 A 387 5 Cl. 2

5Cr-‘/*MO-Si

1.13
5Cr-‘/*MO A 182
A 182
F5a
F5
A 217 c5
I A 182
A 182

1.14 9Cr-1 MO A 182 F9 A 217 Cl2 A 182

1.15 9Cr-1 Mo-V I A 182 F91 I A 217 C12A A 387 91 Cl.2 A 182
VALVES - FLANGED
THREADED, AND WELDING END ASME B16.34-1996

PRESSURE-TEMPERATURE RATINGS

For definition of Standardand Special Classes,see paras.2.1.1 and 2.1.2. Tables 2 follow
on pp. 33 - 87.

NOTE: All pressures are given as gage pressure.

31
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-1 .l (4
RATINGS FOR GROUP 1.1 MATERIALS
A 105 (l)(6) A 515 Gr. 70 (I) A 675 Gr. 70 (l)(4)(5) A 672 Gr. B70 (I)
A216Gr.WCBfI) A 516 Gr. 70 (l)(2) A 696 Gr. C A 672 Gr. C70 (I)
A 350 Gr. LF2 (1) A 537 Cl. 1 (3) A 350 Gr. LF6 Cl.1 (7)

NOTES:
(I) Upon prolonged exposure to temperatures above 8OO”F, the carbide phase of steel may be
converted to graphite. Permissible, but not recommended for prolonged use above 800°F.
(2) Not to be used over 850°F.
(3) Not to be used over 700°F.
(4) Leaded grades shall not be used where welded or in any application above 5OO’F.
(5) For service temperatures above 850°F. it is recommended that killed steels containing not
less than 0.10% residual silicon be used.
(6) Only killed steel shall be used above 850°F.
(7) Not to be used over 500°F.

TABLE 2-l.lA STANDARD CLASS

Working Pressures by Classes, psig

Temperature, “F 150 360 400 606 900 1500 2500 4500

-20 to 100 285 740 990 1,480 2,220 3,705 6,170 11,110
200 260 675 900 1,350 2,025 3,375 5,625 10,120
300 230 655 875 1,315 1,970 3,280 5,470 9,845
400 200 635 845 1,270 1,900 3,170 5,280 9,505
500 170 600 800 1,200 1,795 2,995 4,990 8,980

600 140 550 730 1,095 1,640 2,735 4,560 8,210

650 125 535 715 1,075 1,610 2,685 4,475 8,055
700 110 535 710 1,065 1,600 2,665 4,440 7,990
750 95 505 670 1,010 1,510 2,520 4,200 7,560
800 80 410 550 825 1,235 2,060 3,430 6,170

850 65 270 355 535 805 1,340 2,230 4,010

900 50 170 230 345 515 860 1,430 2,570
950 35 105 140 205 310 515 860 1,545
1000 20 50 70 105 155 260 430 770

TABLE 2-l.lB SPECIAL CLASS

Working Pressures bv Classe !S. Psi9
Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 275 715 950 1,425 2,140 3,565 5,940 10,690

650 270 700 935 1,400 2,100 3,495 5,825 10,485
700 265 695 925 1,390 2,080 3,470 5,780 10,405
750 240 630 840 1,260 1,890 3,150 5,250 9,450
800 200 515 685 1,030 1,545 2,570 4,285 7,715

850 130 335 445 670 1,005 1,670 2,785 5,015

900 85 215 285 430 645 1,070 1,785 3,215
950 50 130 170 260 385 645 1,070 1,930
1000 25 65 85 130 195 320 535 965

33
 VALVES -FLANGED,
ASME B16.34a-1998 THREADED,ANDWELDlNG END

(al TABLE 2-1.2

RATINGS FOR GROUP 1.2 MATERIALS
A 106 Gr. C (3) A203 Gr.E (1) A350 Gr.LF3 (2) A352Gr.LC3(2)
A 203 Gr. B (1) A216Gr.WCC(l) A352 Gr.LC2 (2) A352Gr.LCCf2)
A 350 Gr. LF6 Cl.2 (4)

NOTES:
(I) Upon prolonged exposuretotemperatures above 800"F,thecarbide phaseofsteel may be
converted to graphite. Permissible, but not recommended for prolonged use above 800°F.
(2) Not to be used over 65O“F.
(3) Not to be used over800"F.
(4) Not to be used over 500°F.

TABLE 2-1.2A STANDARD CLASS

Working Pressures by Classes, psig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 505 670 1,010 1,510 2,520 4,200 7,560
800 80 410 550 825 1,235 2,060 3,430 6,170

850 65 270 355 535 805 1,340 2,230 4,010

900 50 170 230 345 515 860 1,430 2,570
950 35 105 140 205 310 515 860 1,545
1000 20 50 70 105 155 260 430 770

TABLE 2-1.2B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature,OF 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 275 710 950 1,425 2,135 3,560 5,930 10,670
750 240 630 840 1,260 1,890 3,150 5,250 9,450
800 195 515 685 1,030 1,545 2,570 4,285 7,715

850 130 335 445 670 1,005 1,670 2,785 5,015

900 80 215 285 430 645 1,070 1,785 3,215
950 50 130 170 260 385 645 1,070 1,930
1000 25 65 85 130 195 320 535 965

34
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34s1998

TABLE 2-1.3
RATINGS FOR GROUP 1.3 MATERIALS
A 203 Gr. A (I) A 352 Gr. LCB (5) A 516 Gr. 65 (l)(2) A 672 Gr. B65 (1)
A 203 Gr. D (I) A 515 Gr. 65 (I) A 675 Gr. 65 (l)(3)(4) A 672 Gr. C65 (1)

NOTES:
(I) Upon prolonged exposure to temperatures above 8OO”F, the carbide phase of steel may be
converted to graphite. Permissible, but not recommended for prolonged use above 800°F.
(2) Not to be used over 850°F.
(3) Leaded grades shall not be used where welded or in any application above 500°F.
(4) For service temperatures above 85O"F, it is recommended that killed steel containing not
less than 0.10% residual silicon be used.
(5) Not to be used over 650°F.

TABLE 2-1.3A STANDARD CLASS

Working Press res by Class , psig
Temperature, F
‘ 150 300 400 606 go0 1500 2500 4500

-2oto 100 265 695 925 1,390 2,085 3,470 5,785 10,415
200 250 655 875 1,315 1,970 3,280 5,470 9,845
300 230 640 850 1,275 1,915 3,190 5,315 9,565
400 200 620 825 1,235 1,850 3,085 5,145 9,260
500 170 585 775 1,165 1,745 2,910 4,850 8,735

600 140 535 710 1,065 1,600 2,665 4,440 7,990

650 125 525 695 1,045 1,570 2,615 4,355 7,840
700 110 520 690 1,035 1,555 2,590 4,320 7,775
750 95 475 630 945 1,420 2,365 3,945 7,100
800 80 390 520 780 1,175 1,955 3,260 5,865

650 65 270 355 535 805 1,340 2,230 4,010

900 50 170 230 345 515 860 1,430 2,570
950 35 105 140 205 310 515 860 1,545
1000 20 50 70 105 155 260 430 770

TABLE 2-1.3B SPECIAL CLASS

Working Pressures by Classes, psig

Temoerature. F
‘ 150 300 400 600 900 1500 2500 4500

-2oto 100 265 695 925 1,390 2,085 3,470 5,785 10,415
200 265 695 925 1,390 2,085 3,470 5,785 10,415
300 265 695 925 1,390 2,085 3,470 5,785 10,415
400 265 695 925 1,390 2,085 3,470 5,785 10,415
500 265 695 925 1,390 2,085 3,470 5,785 10,415

600 265 695 925 1,390 2,085 3,470 5,780 10,405

650 260 680 910 1,360 2,040 3,400 5,670 10,205
700 255 665 885 1,330 1,995 3,320 5,535 9,965
750 225 590 790 1,185 1,775 2,960 4,930 8,870
800 190 490 650 980 1,465 2,445 4,070 7,330

850 130 335 445 670 1,005 1,670 2,785 5,015

900 85 215 285 430 645 1,070 1,785 3,215
950 50 130 170 260 385 645 1,070 1,930
1000 25 65 85 130 195 320 535 965

35
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

TABLE 2-1.4
RATINGS FOR GROUP 1.4 MATERIALS
A 106 Gr. B (I) A 515 Gr. 60 (l)(2) A 675 Gr. 60 (l)(2)(3) A 672 Gr. B60 (I)
A 350 Gr. LFI (I) A 516 Gr. 60 (l)(2) A 696 Gr. B A 672 Gr. C60 (I)

NOTES:
(I) Upon prolonged exposure to temperatures above 8OO”F, the carbide phase of steel may be
converted to graphite. Permissible, but not recommended for prolonged use above 800°F.
(2) Not to be used over 850°F.
(3) Leaded grades shall not be used where welded or in any application above 500°F.

TABLE 2-1.4A STANDARD CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 235 620 825 1,235 1,850 3,085 5,145 9,260
200 215 560 750 1,125 1,685 2,810 4,680 8,425
300 210 550 730 1,095 1,640 2,735 4,560 8,210
400 200 530 705 1,060 1,585 2,645 4,405 7,930
500 170 500 665 995 1,495 2,490 4,150 7,470

600 140 455 610 915 1,370 2,285 3,805 6,850

650 125 450 600 895 1,345 2,245 3,740 6,725
700 110 450 600 895 1,345 2,245 3,740 6,725
750 95 445 590 885 1,325 2,210 3,685 6,635
800 80 370 495 740 1,110 1,850 3,085 5,555

850 65 270 355 535 805 1,340 2,230 4,010

900 50 170 230 345 515 860 1,430 2,570
950 35 105 140 205 310 515 860 1,545
1000 20 50 70 105 155 260 430 770

(a) TABLE 2-1.4B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 245 645 860 1,285 1,930 3,215 5,360 9,645
200 245 645 860 1,285 1,930 3,215 5,360 9,645
300 245 645 860 1,285 1,930 3,215 5,360 9,645
400 245 645 860 1,285 1,930 3,215 5,360 9,645
500 245 645 860 1,285 1,930 3,215 5,360 9,645

600 230 595 795 1,190 1,785 2,975 4,955 8,920

650 225 585 780 1,170 1,750 2,920 4,865 8,760
700 220 580 770 1,160 1,735 2,895 4,820 8,680
750 210 555 740 1,105 1,660 2,765 4,610 8,295
800 180 465 620 925 1,390 2,315 3,860 6,945

850 130 335 445 670 1,005 1,670 2,785 5,015

900 85 215 285 430 645 1,070 1,785 3,215
950 50 130 170 260 385 645 1,070 1,930
1000 25 65 85 130 195 320 535 965

36
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-1.5 (a)

RATINGS FOR GROUP 1.5 MATERIALS
A 182 Gr. Fl (1) A 204 Gr. A (1) A 352 Gr. LCI (3) A 691 Gr. CM-70 (1)
A 204 Gr. A (I) A 217 Gr. WC1 (l)(2)

NOTES:
(1) Upon prolonged exposure to temperatures above 875°F. the carbide phase of carbon-molyb-
denum steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 875°F.
(2) Use normalized and tempered material only.
(3) Not to be used over 650°F.

TABLE 2-1.5A STANDARD CLASS

Workina Pressures bv. Classes, psig

Temperature, OF 150 300 400 600 I 900 1500 2500 4500

-20 to 100 265 695 925 1,390 2,085 3,470 5,785 10,415
200 260 680 905 1,360 2,035 3,395 5,660 10,185
300 230 655 870 1,305 1,955 3,260 5,435 9,780
400 200 640 855 1,280 1,920 3,200 5,330 9,595
500 170 620 830 1,245 1,865 3,105 5,180 9,320

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 280 375 560 845 1,405 2,345 4,215
1000 20 165 220 330 495 825 1,370 2,470

TABLE 2-1.5B SPECIAL CLASS (a)

l- Working Pressures bv Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 265 695 925 1,390 2,085 3,470 5,785 10,415
200 265 695 925 1,390 2,085 3,470 5,785 10,415
300 265 695 925 1,390 2,085 3,470 5,785 10,415
400 265 695 925 1,390 2,085 3,470 5,785 IO,41 5
500 265 695 925 1,390 2,085 3,470 5,785 10,415

600 265 695 925 1,390 2,085 3,470 5,785 10,415

650 265 695 925 1,390 2,085 3,470 5,785 10,415
700 265 695 925 1,390 2,085 3,470 5,785 10,415
750 265 695 925 1,390 2,085 3,470 5,785 10,415
800 265 695 925 1,390 2,085 3,470 5,785 10,415

850 260 680 905 1,355 2,030 3,335 5,645 10,160

900 225 590 785 1,175 1,760 2,935 4,895 8,810
950 135 350 470 705 1,055 1,755 2,930 5,270
1000 80 205 275 410 615 1,030 1,715 3,085

31
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

(a) TABLE 2-1.6

RATINGS FOR GROUP 1.6 MATERIALS
A 335 Gr. PI (l)(3) A 387 Gr. 12 Cl. 1 (2) A 387 Gr. 2 Cl. 2 (3) A 691 Gr. /‘*CR (3)
A369Gr.FPl (l)(3) A 387 Gr. 2 Cl. 1 (3)

NOTES:
(I 1 Upon prolonged exposure to temperatures above 875”F, the carbide phase of carbon-molyb-
denum steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 875°F.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 1000°F.

TABLE 2-1.6A STANDARD CLASS

T Working Pressures by Classes i. Prsig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 225 590 790 1,185 1,775 2,955 4,930 8,870
200 225 590 790 1,185 1,775 2,955 4,930 8,870
300 225 590 790 1,185 1,775 2,955 4,930 8,870
400 200 570 765 1,145 1,715 2,860 4,765 8,580
500 170 550 735 1,105 1,655 2,755 4,595 8,270

600 140 535 710 1,065 1,600 2,665 4,440 7,990

650 125 525 695 1,045 1,570 2,615 4,355 7,840
700 110 510 685 1,025 1,535 2,560 4,270 7,685
750 95 475 630 945 1,420 2,365 3,945 7,095
800 80 475 630 945 1,420 2,365 3,945 7,095

850 65 460 615 920 1,380 2,295 3,830 6,890

900 50 440 590 885 1,325 2,210 3,685 6,635
950 35 315 420 630 945 1,575 2,630 4,730
1000 20 200 270 405 605 1,010 1,685 3,035
1050 20(l) 155 205 310 465 770 1,285 2,315

1100 20(l) 95 130 190 290 480 800 1,440

1150 20(l) 60 80 125 185 310 515 925
1200 15(l) 40 50 75 115 190 315 565

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

38
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-1.6 (CONT’D)

RATINGS FOR GROUP 1.6 MATERIALS
A 335 Gr. Pl (l)(3) A 387 Gr. 12 Cl. 1 (2) A 387 Gr. 2 Cl. 2 (3) A 691 Gr. /‘$R (3)
A 369 Gr. FPl (l)(3) A 387 Gr. 2 Cl. 1 (3)

NOTES:
(1) Upon prolonged exposure to temperatures above 875”F, the carbide phase of Carbon-molybde-
num steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 875°F.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 1000°F.

TABLE 2-1.6B SPECIAL CLASS

-r Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 225 590 790 1,185 1,775 2,955 4,930 8,870
200 225 590 790 1,185 1,775 2,955 4,930 8,870
300 225 590 790 1,185 1,775 2,955 4,930 8,870
400 225 590 790 1,185 1,775 2,955 4,930 8,870
500 225 590 790 1,185 1,775 2,955 4,930 8,870

600 225 590 790 1,185 1,775 2,955 4,930 8,870

650 225 590 790 1,185 1,775 2,955 4,930 8,870
700 225 590 790 1,185 1,775 2,955 4,930 8,870
750 225 590 790 1,185 1,775 2,955 4,930 8,870
800 225 590 790 1,185 1,775 2,955 4,930 8,870

850 220 575 765 1,150 1,725 2,870 4,785 8,615

900 210 555 735 1,105 1,660 2,765 4,605 8,295
950 150 395 525 790 1,185 1,970 3,285 5,915
1000 95 255 335 505 760 1,265 2,105 3,795
1050 75 195 255 385 580 965 1,605 2,895

1100 45 120 160 240 360 600 1,000 1,800

1150 30 75 105 155 230 385 645 1,155
1200 20 45 65 95 140 235 395 705

39
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-1.7
RATINGS FOR GROUP 1.7 MATERIALS
A 691 Gr. CM-75 A 204 Gr. C (I) A 217 Gr. WC4 (2)(3) A 217 Gr. WC5 (2)
A 182 Gr. F2 (3)

NOTES:
(I) Upon prolonged exposure to temperatures above 875”F, the carbide phase of Carbon-molybde-
num steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 875°F.
(2) Use normalized and tempered material only.
(3) Not to be used over 1000°F.

TABLE 2-1.7A STANDARD CLASS

I- Working Pressures by Classes, psig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 720 965 1,445 2,165 3,610 6,015 10,830
400 200 695 925 1,385 2,080 3,465 5,775 10,400
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 315 420 630 945 1,575 2,630 4,730
1000 20 200 270 405 605 1,010 1,685 3,035
1050 20(I) 160 210 315 475 790 1,315 2,365
L

NOTE:
(I) For welding end valves only. Flanged end ratings terminate at 1000°F.

TABLE 2-1.7B SPECIAL CLASS

Working Pressures by Classes, psig
l-
Temperature,'F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,665 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6,000 10,800

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 150 395 525 790 1,185 1,970 3,285 5,915
1000 95 255 335 505 760 1,265 2,105 3,795
1050 75 195 265 395 590 985 1,645 2,955

40
VALVES-FLANGED
THREADED,ANDWELDlNG END ASME B16.34-1996

TABLE 2-1.8
RATINGS FOR GROUP 1.8 MATERIALS
A335Gr.P11(2) A369 Gr.FPll(2) A 367 Gr. 11 Cl. 1 (2) A691 Gr. lCR(1)(2)
A335Gr.P12(2) A369Gr.FP12(2) A 387 Gr. 12 Cl. 2 (2) A 691 Gr. l'/&ZR (2)
A335 Gr.P22(2) A369 Gr.FP22(2) A 387 Gr. 22 Cl. 1 (2) A 691 Gr. 25hCR (2)

NOTES:
(1) Use normalized and tempered material only.
(2) Permissible, but not recommended for prolonged use above 1100°F.

TABLE 2-1.8A STANDARD CLASS

-r Working Pressures by Classes ssig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-2oto 100 235 620 825 1,235 1,860 3,085 5,145 9,260
200 220 570 765 1,145 1,715 2,860 4,765 8,580
300 215 555 745 1,115 1,670 2,785 4,645 8,360
400 200 555 740 1,105 1,660 2,765 4,610 8,300
500 170 555 740 1,105 1,660 2,765 4,610 8,300

600 140 555 740 1,105 1,660 2,765 4,610 8,300

650 125 555 740 1,105 1,660 2,765 4,610 8,300
700 110 545 725 1,085 1,630 2,715 4,525 8,145
750 95 515 685 1,030 1,545 2,570 4,285 7,715
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 320 425 640 955 1,595 2,655 4,785
1000 20 215 290 430 650 1,080 1,800 3,240
1050 20(l) 145 190 290 430 720 1,200 2,160

1100 20(l) 95 130 190 290 480 800 1,440

1150 20(l) 60 80 125 185 310 515 925
1200 15(l) 40 50 75 115 190 315 565

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

41
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-1.8 (CONT’D)

RATINGS FOR GROUP 1.8 MATERIALS
A 335 Gr. Pll (2) A 369 Gr. FPll (2) A 387 Gr. 11 Cl. 1 (2) A691 Gr. 1CR (1) (2)
A 335 Gr. PI2 (2) A 369 Gr. FP12 (2) A 387 Gr. 12 Cl. 2 (2) A 691 Gr. l&CR (2)
A 335 Gr. P22 (2) A 369 Gr. FP22 (2) A 387 Gr. 22 Cl. 1 (2) A 691 Gr. 2’/$ZR (2)

NOTES:
(1) Use normalized and tempered material only.
(2) Permissible, but not recommended for prolonged use above 1100°F.

TABLE 2-1.8B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 245 645 860 1,285 1,930 3,215 5,360 9,645
200 245 645 860 1,285 1,930 3,215 5,360 9,645
300 245 645 860 1,285 1,930 3,215 5,380 9,645
400 245 645 860 1,285 1,930 3,215 5,360 9,845
500 245 645 880 1,285 1,930 3,215 5,360 9,645

600 245 845 860 1,285 1,930 3,215 5,380 9,645

650 245 645 860 1,285 1,930 3,215 5,380 9,645
700 245 645 860 1,285 1,930 3,215 5,360 9,645
750 245 845 860 1,285 1,930 3,215 5,360 9,645
800 245 645 860 1,285 1,930 3,215 5,380 9,645

850 235 615 825 1,235 1,850 3,085 5,145 9,255

900 225 585 775 1,165 1,750 2,915 4,855 8,745
950 155 400 530 795 1,195 1,995 3,320 5,980
1000 105 270 360 540 810 1,350 2,250 4,050
1050 70 180 240 360 540 900 1,500 2,700

1100 45 120 160 240 360 600 1,000 1,800

1150 30 75 105 155 230 385 645 1,155
1200 20 45 65 95 140 235 395 705

42
VALVES-FLANGED
THREADED.ANDWELDlNG END ASME 816.34-1996

TABLE 2-l .9
RATINGS FOR GROUP 1.9 MATERIALS
A 162 Gr. Fll Cl. 2 (l)(2) A 217 Gr. WC6 (l)(3) A 367 Gr. 11, Cl. 2 (2) A739 Gr.Bll(2)
A 162 Gr. F12 Cl. 2 (l)(2)

NOTES:
(1) Use normalized and tempered material only.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 1100°F.

TABLE 2-1.9A STANDARD CLASS

T Working Pressures bv Classes i. cbsig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 720 965 1,445 2,165 3,610 6,015 10,830
400 200 695 925 1,385 2,080 3,465 5,775 10,400
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 320 425 640 955 1,595 2,655 4,785
1000 20 215 290 430 650 1,080 1,800 3,240
1050 20(l) 145 190 290 430 720 1,200 2,160

1100 20(l) 95 130 190 290 480 800 1,440

1150 20(l) 60 80 125 185 310 515 925
1200 15(l) 40 50 75 115 190 315 565

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

43
 VALVES-FLANGED,
ASME 816.34-1996 THREADED,ANDWELDlNG END

TABLE 2-1.9 (CONT’D)

RATINGS FOR GROUP 1.9 MATERIALS
A 182 Gr.Fll (X2(1)(2) A 217 Gr. WC6 (l)(3) A 387 Gr. 11, Cl. 2 (2) A739 Gr.Bll(2)
A 182Gr. F12 Cl.2 (l)(2)

NOTES:
(1) Use normalized and tempered material only.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Notto be used over 1100°F.

TABLE 2-1.9B SPECIAL CLASS

l- Workina Pressures bv Class6lS. Psi9
Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,665 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6,000 10,800

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 225 585 785 1,175 1,760 2,935 4,895 8,805
950 155 400 530 795 1,195 1,995 3,320 5,980
1000 105 270 360 540 810 1,350 2,250 4,050
1050 70 180 240 360 540 900 1,500 2,700

1100 45 120 160 240 360 600 1,000 1,800

1150 30 75 105 155 230 385 645 1,155
1200 20 45 65 95 140 235 395 705

44
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-1.10
RATINGS FOR GROUP 1.10 MATERIALS
A 182 Gr. F22 Cl. 3 (2) A 217 Gr. WC9 (l)(3) A 387 Gr. 22, Cl. 2 (2) A 739 Gr. 822 (2)

NOTES:
(1) Use normalized and tempered material only.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 1100°F.

TABLE 2-l.lOA STANDARD CLASS

:ina Pressures bv Classes i. Ewig

Temperature,"F 150 300 400 600 900 1500 2500 4600

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 375 505 755 1,130 1,885 3,145 5,665
1000 20 260 345 520 780 1,305 2,170 3,910
1050 20(l) 175 235 350 525 875 1,455 2,625

1100 20(l) 110 145 220 330 550 915 1,645

1150 20(l) 70 90 135 205 345 570 1,030
1200 20(l) 40 55 80 125 205 345 615

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

45
 VALVES-FLANGED,
ASME 816.34-1996 THREADED,ANDWELDlNG END

TABLE 2-1.10 (CONT’D)

RATINGS FOR GROUP 1.10 MATERIALS
A 182 Gr. F22 Cl. 3 (2) A 217 Gr. WC9 (l)(3) A 387 Gr. 22, Cl. 2 (2) A739Gr.B22(2)

NOTES:
(I) Use normalized and tempered material only.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 1100°F.

TABLE 2-l.lOB SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature,'F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 285 740 990 1,485 2,225 3,705 6,180 11,120
400 280 725 965 1,450 2,175 3,620 6,035 10,865
500 275 720 960 1,440 2,160 3,600 6,000 10,800

600 275 720 960 1,440 2,160 3,600 6,000 10,800

650 275 715 955 1,430 2,145 3,580 5,965 10,735
700 275 710 955 1,425 2,135 3,555 5,930 10,670
750 265 690 920 1,380 2,070 3,450 5,750 10,350
800 260 675 895 1,345 2,020 3,365 5,605 10,095

850 245 645 855 1,285 1,930 3,215 5,355 9,645

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 180 470 630 945 1,415 2,355 3,930 7,070
1000 125 325 435 650 975 1,630 2,715 4,885
1050 85 220 290 435 655 1,095 1,820 3,280

1100 55 135 185 275 410 685 1,145 2,055

1150 35 85 115 170 255 430 715 1,285
1200 25 50 70 105 155 255 430 770
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-1.11
RATINGS FOR GROUP 1.11 MATERIALS
A 182 Gr. F21 (2) A 302 Gr. B (1) A 302 Gr. D (1) A 537 Cl. 2 (3)
A 302 Gr. A (1) A 302 Gr. C (1) A 387 Gr. 21, Cl. 2 (2)

NOTES:
(1) Upon prolonged exposure to temperatures above 875°F. the carbide phase of carbon-molybde-
num steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 1000°F.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 700°F.

TABLE 2-l.l lA STANDARD CLASS

T Working Pressures by Classes I‘ r)sig

Temperature, “F 150 300 400 600 900 1600 2600 4600

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,345 2,245 3,745 6,735
950 35 280 375 560 845 1,405 2,345 4,215
1000 20 165 220 330 495 825 1,370 2,470
1050 20(l) 165 220 330 495 825 1,370 2,470

1100 20(l) 110 145 220 330 550 915 1,645

1150 20(l) 80 110 165 245 410 685 1,235
1200 20(l) 45 60 90 135 225 370 670

(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

47
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE Z-l.11 (CONT’D)

RATINGS FOR GROUP 1 .l 1 MATERIALS
A 162 Gr. F21 (2) A 302 Gr. B (1) A 302 Gr. D (1) A 537 Cl. 2 (3)
A 302 Gr. A (1) A 302 Gr. C (1) A 367 Gr. 21, Cl. 2 (2)

NOTES:
(1) Upon prolonged exposure to temperatures above 875”F, the carbide phase of carbon-molybde-
num steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 1000°F.
(4 Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 700°F.

TABLE 2-1.1 IB SPECIAL CLASS

-r -
Working Pressures bv Classe S. psi9
Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 285 746 995 1,490 2,235 3,730 6,215 11,185
500 285 745 995 1,490 2,235 3,730 6,215 11,185

600 285 745 995 1,490 2,235 3,730 6,215 11,185

650 285 735 985 1,475 2,210 3,685 6,145 11,055
700 280 730 970 1,455 2,185 3,645 6,070 10,930
750 280 730 970 1,455 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6,000 10,800

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 215 560 750 1,125 1,685 2,805 4,680 8,420
950 135 350 470 705 1,055 1,755 2,930 5,270
1000 80 205 275 410 615 1,030 1,715 3,085
1050 80 205 275 410 615 1,030 1,715 3,085

1100 55 135 185 275 410 685 1,145 2,055

1150 40 105 135 205 310 515 855 1,545
1200 20 55 75 110 165 280 465 835

48
VALVES-FLANGED
THREADED,ANDWELDlNG END ASME 816.34-1996

TABLE 2-1.12
RATINGS FOR GROUP 1.12 MATERIALS
A335Gr.P5 A369 Gr.FP5 A 367 Gr. 5, Cl. 2 A691 Gr.5CR
A335Gr.P5b A 387 Gr. Cl. 1

TABLE 2-1.12A STANDARD CLASS

r Working Pressu re!5 by Classes lsig
Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 235 615 825 1,235 1,850 3,085 5,145 9,255
200 215 555 745 1,115 1,670 2,785 4,645 8,360
300 205 535 715 1,075 1,610 2,885 4,475 8,055
400 200 530 710 1,060 1,590 2,655 4,425 7,960
500 170 525 700 1,055 1,580 2,635 4,390 7,900

600 140 520 690 1,035 1,555 2,590 4,320 7,775

650 125 510 685 1,025 1,535 2,560 4,270 7,685
700 110 505 670 1,010 1,510 2,520 4,200 7,560
750 95 455 605 905 1,360 2,265 3,770 6,790
800 80 440 585 880 1,315 2,195 3,655 6,585

850 65 415 555 830 1,245 2,075 3,455 6,225

900 50 375 500 745 1,120 1,870 3,115 5,605
950 35 275 365 550 825 1,370 2,285 4,115
1000 20 200 265 400 595 995 1,655 2,985
1050 20(l) 145 190 290 430 720 1,200 2,160

1100 20(l) lob 135 200 300 495 830 1,490

1150 20(l) 60 80 125 185 310 515 925
1200 15(l) 35 45 70 105 170 285 515

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

49
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-1.12 (CONT’D)

RATINGS FOR GROUP 1.12 MATERIALS
A 335 Gr. P5 A 369 Gr. FP5 A 387 Gr. 5, Cl. 2 A 691 Gr. 5CR
A 335 Gr. P5b A 387 Gr. Cl. 1

TABLE 2-1.12B SPECIAL CLASS

l- Working Pressures by Classes, psig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 245 645 855 1,285 1,930 3,215 5,355 9,645
200 245 645 855 1,285 1,930 3,215 5,355 9,645
300 240 620 830 1,245 1,865 3,105 5,180 9,320
400 235 615 825 1,235 1,850 3,085 5,145 9,255
500 235 615 825 1,235 1,850 3,085 5,145 9,255

600 235 610 810 1,215 1,825 3,045 5,070 9,130

650 230 595 795 1,190 1,785 2,980 4,965 8,935
700 225 585 785 1,175 1,760 2,935 4,895 8,805
750 215 565 755 1,130 1,695 2,830 4,715 8,485
800 210 550 730 1,095 1,645 2,745 4,570 8,230

650 200 520 690 1,035 1,555 2,595 4,320 7,780

900 180 485 625 935 1,400 2,335 3,895 7,005
950 130 345 455 685 1,030 1,715 2,855 5,145
1000 95 250 330 495 745 1,245 2,070 3,730
1050 70 180 240 360 540 900 1,500 2,700

1100 50 125 165 250 375 620 1,035 1,865

1150 30 75 105 155 230 385 645 1,155
1200 15 45 55 85 130 215 355 645

50
VALVES - FLANGED,
THREADED,ANDWELDlNG END ASME B16.34a-1998

TABLE 2-1.13
RATINGS FOR GROUP 1.13 MATERIALS
Al82 Gr.F5 Al82 Gr.F5a A 217 Gr. C5 (1)

NOTE:
(I) Use normalized and tempered material only.

TABLE 2-1.13A STANDARD CLASS

Working Pressures bv Classes, Fbsig

Temperature, F
‘ 150 300 400 1 600 900 r 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 745 995 1,490 2,235 3,725 6,205 11,170
300 230 715 955 1,430 2,150 3,580 5,965 10,740
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 705 1,055 1,585 2,640 4,400 7,920
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 645 965 1,450 2,415 4,030 7,250

900 50 370 495 740 1,110 1,850 3,085 5,555
950 35 275 365 550 825 1,370 2,285 4,115
1000 20 200 265 400 595 995 1,655 2,985
1050 2011) 145 190 290 430 720 1,200 2,160

1100 20(l) 100 135 200 300 495 830 1,490

1150 20(l) 60 80 125 185 310 515 925
1200 15(l) 35 45 70 105 170 285 515

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

TABLE 2-1 .13B SPECIAL CLASS

l- Working Pressures by Classes, psig

Temperature, F
‘ 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 280 730 970 1,455 2,185 3,645 6,070 10,930
400 275 720 960 1,440 2,160 3,600 6,000 10,800
500 275 720 960 1,440 2,160 3,600 6,000 10,800

600 270 705 945 1,415 2,120 3,535 5,895 10,605

650 270 700 930 1,395 2,095 3,495 5,820 10,480
700 265 685 915 1,370 2,055 3,430 5,715 10,285
750 255 660 880 1,320 1,980 3,300 5,500 9,900
800 245 640 850 1,275 1,915 3,195 5,320 9,580

850 230 605 805 1,210 1,815 3,020 5,035 9,065

900 175 465 615 925 1,390 2,315 3,855 6,945
950 130 345 455 685 1,030 1,715 2,855 5,145
1000 95 250 330 495 745 1,245 2,070 3,730
1050 70 180 240 360 540 900 1,500 2,700

1100 50 125 165 250 375 620 1,035 1,865

1150 30 75 105 155 230 385 645 1,155
1200 15 45 55 85 130 215 355 645

51
 VALVES -FLANGED,
ASME B16.34a-1998 THREADED,ANDWELDlNG END

TABLE 2-1.14
RATINGS FOR GROUP 1.14 MATERIALS
Al82 Gr.F9 A 217 Gr.Cl2 (1)

NOTE:
(1) Use normalized and tempered material only.

TABLE 2-1.14A STANDARD CLASS

T Working Pressures by Classes,psig

Temperature,OF 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 375 505 755 1,130 1,885 3,145 5,655
1000 20 255 340 505 760 1,270 2,115 3,805
1050 20(l) 170 230 345 515 855 1,430 2,570

1100 20(l) 115 150 225 340 565 945 1,695

1150 20(l) 75 100 150 225 375 630 1,130
1200 20(l) 50 70 105 155 255 430 770

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

TABLE 2-1.14B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature,OF 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,665 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6,000 10,800

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 180 470 630 945 1,415 2,355 3,930 7,070
1000 120 315 425 635 950 1,585 2,645 4,755
1050 80 215 285 430 645 1,070 1,785 3,215

1100 55 140 190 285 425 710 1,180 2,120

1150 35 95 125 190 285 470 785 1,415
1200 25 65 85 130 195 320 535 965

52
VALVES - FLANGED,
THREADED,ANDWELDlNG END ASME B16.34a-1998

TABLE 2-1.15 (4
RATINGS FOR GROUP 1.15 MATERIALS
Al82 Gr. F91 A217 Gr.Cl2A A335 Gr.P91 A 387 Gr. 91 Cl.2

TABLE 2-1.15A STANDARD CLASS

Working Pressure by Classes lsig

Temperature, OF 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 20(l) 300 400 605 905 1,510 2,515 4,525

1150 20(l) 225 295 445 670 1,115 1,855 3,345
1200 20(l) 145 190 290 430 720 1,200 2,160

NOTE:
(1) For welding end only. Flanged end ratings terminate at 1000°F.

TABLE 2-1.15B SPECIAL CLASS (4

r Workins Pressure bv Classes, psia

Temperature,"F 150 300 400 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,665 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6,000 10,800

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 145 375 505 755 1,130 1,885 3,145 5,655

1150 105 280 370 555 835 1,395 2,320 4,180
1200 70 180 240 360 540 900 1,500 2,700

52.1
VALVES - FLANGED,
THREADED,ANDWELDlNG END ASME B16.34a-1998

TABLE 2-2.1
RATINGS FOR GROUP 2.1 MATERIALS
A 182 Gr. F304 (I) A 312 Gr.TP304(1) A358 Gr.304(1) A430 Gr.FP304H
Al82 Gr.F304H A312 Gr.TP304H A 376 Gr.TP304(1) A479 Gr.304(1)
A240 Gr.304(1) A 351 Gr.CF3 (2) A376 Gr.TP304H A479 Gr.304H
A 240 Gr.304H A351 Gr.CF8 (1) A430 Gr.FP304(1)

NOTES:
(I) At temperatures over 1000°F, use only when the carbon content is 0.04% or higher.
(2) Not to be used over 800°F.

TABLE 2-2.1A STANDARD CLASS (4

-r Workina ‘ C Psi9
Pressures bvclasse S

Temperature,OF 150 300 400 600 900 1500 2500 4500

-2oto 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 230 600 800 1,200 1,800 3,000 5,000 9,000
300 205 540 720 1,080 1,620 2,700 4,500 8,100
400 190 495 660 995 1,490 2,485 4,140 7,450
500 170 465 620 930 1,395 2,330 3,880 6,985

600 140 435 580 875 1,310 2,185 3,640 6,550

650 125 430 575 860 1,290 2,150 3,580 6,445
700 110 425 565 850 1,275 2,125 3,540 6,370
750 95 415 555 830 1,245 2,075 3,460 6,230
800 80 405 540 805 1,210 2,015 3,360 6,050

850 65 395 530 790 1,190 1,980 3,300 5,940

900 50 390 520 780 1,165 1,945 3,240 5,830
950 35 380 510 765 1,145 1,910 3,180 5,725
1000 20 320 430 640 965 1,605 2,675 4,815
1050 20(l) 310 410 615 925 1,545 2,570 4,630

1100 20(l) 255 345 515 770 1,285 2,145 3,855

1150 20(l) 200 265 400 595 995 1,655 2,985
1200 20(l) 155 205 310 465 770 1,285 2,315
1250 20(l) 115 150 225 340 565 945 1,695
1300 20(l) 85 115 170 255 430 715 1,285

1350 20(l) 60 80 125 185 310 515 925

1400 20(l) 50 65 95 145 240 400 720
1450 15(l) 35 45 70 105 170 285 515
1500 IO(l) 25 35 55 80 135 230 410

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

53
 VALVES-FLANGED,
ASME B16.34a-1998 THREADED,ANDWELDlNG END

TABLE 2-2.1 (CONT’D)

RATINGS FOR GROUP 2.1 MATERIALS
A 182 Gr. F304 (1) A 312 Gr.TP304(1) A358 Gr.304(1) A430 Gr.FP304H
Al82 Gr.F304H A 312 Gr.TP304H A376 Gr.TP304 (1) A479 Gr.304(1)
A240 Gr.304 (I) A351 Gr.CF3(2) A376 Gr.TP304H A479 Gr.304H
A240 Gr.304H A 351 Gr. CF8 (1) A430 Gr. FP304 (I)

NOTES:
(1) At temperatures over lOOO"F, use only when the carbon content is 0.04% or higher.
(2) Not to be used over 800°F.

(a) TABLE 2-2.1 B SPECIAL CLASS

T Working Pressures by Classes,psig
Temperature,OF 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 255 670 890 1,335 2,005 3,345 5,570 10,030
300 230 600 800 1,200 1,800 3,000 5,000 9,000
400 210 555 735 1,105 1,660 2,765 4,605 8,295
500 200 520 690 1,035 1,555 2,595 4,320 7,780

600 185 490 650 975 1,465 2,440 4,065 7,315

650 185 480 640 960 1,440 2,395 3,995 7,190
700 180 470 630 945 1,415 2,355 3,930 7,070
750 175 465 615 925 1,390 2,315 3,855 6,945
800 175 450 600 900 1,350 2,250 3,750 6,750

850 170 440 590 885 1,325 2,205 3,680 6,620

900 165 435 575 865 1,300 2,165 3,605 6,495
950 165 425 565 850 1,275 2,120 3,535 6,365
1000 155 405 545 815 1,220 2,035 3,395 6,105
1050 150 385 515 770 1,155 1,930 3,215 5,785

1100 125 320 430 645 965 1,605 2,680 4,820

1150 95 250 330 495 745 1,245 2,070 3,730
1200 75 195 255 385 580 965 1,605 2,895
1250 55 140 190 285 425 705 1,180 2,120
1300 40 105 145 215 320 535 895 1,605

1350 30 75 105 155 230 385 645 1,155

1400 25 60 80 120 180 300 500 900
1450 15 45 55 85 130 215 355 645
1500 15 35 45 70 105 170 285 515

54
VALVES - FLANGED,
THREADED, AND WELDING END ASME 616.34a-1998

TABLE 2-2.2 (a)

RATINGS FOR GROUP 2.2 MATERIALS
A 182 Gr. F316 (1) A 312 Gr. TP316 (1) A 351 Gr. CWA (2) A 430 Gr. FP316 (I)
A 182 Gr. F316H A 312 Gr. TP316H A 351 Gr. CF8M (1) A 430 Gr. FP316H
A 240 Gr. 316 (1) A 312 Gr. TP317 (1) A 358 Gr. 316 (1) A 479 Gr. 316 (I)
A 240 Gr. 316H A 351 Gr. CFBA (2) A 376 Gr. TP316 (1) A 479 Gr. 316H
A 240 Gr. 317 (1) A 351 Gr. CF3M (3) A 376 Gr. TP316H A 351 Gr. CG8M (4)

NOTES:
(1) At temperatures over lOOO”F, use only when the carbon content is 0.04% or higher.
(2) Not to be used over 650°F.
(3) Not to be used over 850°F.
(4) Not to be used over 1000°F.

TABLE 2-2.2A STANDARD CLASS

l- Working Pressures bv Classe S. psi9
-I-

Temperature, OF 150 300 l- 400 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 235 620 825 1,240 1,860 3,095 5,160 9,290
300 215 560 745 1,120 1,680 2,795 4,660 8,390
400 195 515 685 1,025 1,540 2,570 4,280 7,705
500 170 480 635 955 1,435 2,390 3,980 7,165

600 140 450 600 900 1,355 2,255 3,760 6,770

650 125 445 590 890 1,330 2,220 3,700 6,660
700 110 430 580 870 1,305 2,170 3,620 6,515
750 95 425 570 855 1,280 2,135 3,560 6,410
800 80 420 565 845 1,265 2,110 3,520 6,335

850 65 420 555 835 1,255 2,090 3,480 6,265

900 50 415 555 830 1,245 2,075 3,460 6,230
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 350 465 700 1,050 1,750 2,915 5,245
1050 20(l) 345 460 685 1,030 1,720 2,865 5,155

1100 20(l) 305 405 610 915 1,525 2,545 4,575

1150 20(l) 235 315 475 710 1,185 1,970 3,550
1200 20(l) 185 245 370 555 925 1,545 2,775
1250 20(l) 145 195 295 440 735 1,230 2,210
1300 20(l) 115 155 235 350 585 970 1,750

1350 20(l) 95 130 190 290 480 800 1,440

1400 20(l) 75 100 150 225 380 630 1,130
1450 2011) 60 80 115 175 290 485 875
1500 20(l) 40 55 85 125 205 345 620

NOTE:
(I) For welding end valves only. Flanged end ratings terminate at 1000°F.

55
 VALVES - FLANGED,
ASME B16.34e1998 THREADED,ANDWELDlNG END

TABLE 2-2.2 (CONT’D)

RATINGS FOR GROUP 2.2 MATERIALS
A 182 Gr. F316 (1) A 312 Gr.TP316 (1) A351 Gr. CF8A (2) A430 Gr. FP316 (1)
Al82 Gr.F316H A 312 Gr.TP316H A351 Gr. CRM (1) A430 Gr.FP316H
A 240 Gr.316 (1) A 312 Gr.TP317 (1) A 358 Gr.316 (1) A 479 Gr.316 (1)
A240 Gr.316H A351 Gr.CF3A (2) A 376 Gr.TP316 (1) A479 Gr.316H
A240 Gr.317 (1) A 351 Gr.CFBM (3) A 376 Gr.TP316H A351 Gr.CG8M (4)

NOTES:
(1) At temperatures over lOOO"F, use only when the carbon content is 0.04% or higher.
(2) Not to be used over650"F.
(3) Not to be used over850"F.
(4) Not to be used over 1000°F.

TABLE 2-2.2B SPECIAL CLASS

T Working Pressures bv Classes, psig
. -
Temperature,'F 150 390 409 669 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 265 690 920 1,380 2,070 3,450 5,750 10,350
300 240 625 830 1,250 1,870 3,120 5,200 9,360
400 220 570 760 1,140 1,710 2,850 4,750 8,550
500 205 530 710 1,065 1,595 2,655 4,430 7,970

600 195 505 670 1,005 1,510 2,520 4,195 7,555

650 190 495 655 985 1,480 2,465 4,105 7,395
700 185 485 645 970 1,455 2,420 4,035 7,265
750 180 475 635 950 1,425 2,380 3,965 7,135
800 180 470 630 945 1,415 2,355 3,930 7,070

850 180 465 620 930 1,400 2,330 3,885 6,990

900 175 465 615 925 1,390 2,315 3,855 6,945
950 175 460 610 915 1,375 2,290 3,815 6,870
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 145 380 510 765 1,145 1,905 3,180 5,720

1150 115 295 395 590 885 1,480 2,465 4,435
1200 90 230 310 465 695 1,155 1,930 3,470
1250 70 185 245 370 555 920 1,535 2,765
1300 55 145 195 290 435 730 1,215 2,185

1350 45 120 160 240 360 600 1,000 1,800

1400 35 95 125 190 285 470 785 1,415
1450 30 75 100 145 220 365 610 1,095
1500 20 50 70 105 155 260 430 770

56
VALVES-FLANGED,
THREADED,ANDWELDlNG END ASME B16.34a-1998

TABLE 2-2.3
RATINGS FOR GROUP 2.3 MATERIALS
A 182 Gr. F304L(l) A240 Gr.304L (I) A312 Gr.TP304L (I) A479 Gr.304L(l)
Al82 Gr. F316L A 240 Gr.316L A312 Gr.TP316L A479 Gr.316L

NOTE:
(1) Not to be used over800"F.

TABLE 2-2.3A STANDARD CLASS

l- Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-2oto 100 230 600 800 1,200 1,800 3,000 5,000 9,000
200 195 505 675 1,015 1,520 2,530 4,220 7,595
300 175 455 605 910 1,360 2,270 3,780 6,805
400 160 415 550 825 1,240 2,065 3,440 6,190
500 145 380 510 765 1,145 1,910 3,180 5,725

600 140 360 480 720 1,080 1,800 3,000 5,400

650 125 350 470 700 1,050 1,750 2,920 5,255
700 110 345 460 685 1,030 1,715 2,860 5,150
750 95 335 450 670 1,010 1,680 2,800 5,040
800 80 330 440 660 985 1,645 2,740 4,930

850 65 320 430 645 965 1,610 2,680 4,825

TABLE 2-2.3B SPECIAL CLASS (4

Working Pressures by Classes,psig

TemDerature."F 150 300 400 600 900 1500 4500

-2oto 100 255 670 890 1,340 2,005 3,345 5,570 10,030
200 215 565 755 1,130 1,695 2,825 4,710 8,480
300 195 505 675 1,010 1,520 2,530 4,215 7,585
400 175 460 615 920 1,385 2,305 3,840 6,910
500 165 425 570 850 1,280 2,130 3,550 6,390

600 155 400 535 805 1,205 2,010 3,350 6,025

650 150 390 520 780 1,170 1,950 3,250 5,850
700 145 380 510 765 1,145 1,910 3,180 5,720
750 145 375 500 745 1,120 1,865 3,110 5,595
800 140 365 490 735 1,100 1,835 3,060 5,505

850 140 360 480 720 1,075 1,795 2,990 5,385

57
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

TABLE 2-2.4
RATINGS FOR GROUP 2.4 MATERIALS
A 182 Gr. F321 (2) A 312 Gr. TP321 (2) A 376 Gr. TP321 (2) A 430 Gr. FP321H
A 182 Gr. F321H (1) A 312 Gr. TP321H A 376 Gr. TP321 H A 479 Gr. 321 (2)
A 240 Gr. 321 (2) A 358 Gr. 321 (2) A 430 Gr. FP321 (2) A 479 Gr. 321H
A 240 Gr. 321H (1)

NOTES:
(1) At temperatures over lOOO”F, use only if the material is heat treated by heating to a minimum
temperature of 2000°F.
(2) Not to be used over 1000°F.

TABLE 2-2.4A STANDARD CLASS

l- Working Pressures bv Classe ‘S. Psi9
Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 245 645 860 1,290 1,935 3,230 5,380 9,685
300 230 595 795 1,190 1,785 2,975 4,960 8,930
400 200 550 735 1,105 1,655 2,760 4,600 8,280
500 170 515 685 1,030 1,545 2,570 4,285 7,715

600 140 485 650 975 1,460 2,435 4,060 7,310

650 125 480 635 955 1,435 2,390 3,980 7,165
700 110 465 620 930 1,395 2,330 3,880 6,985
750 95 460 610 915 1,375 2,290 3,820 6,875
800 80 450 600 900 1,355 2,255 3,760 6,770

850 65 445 595 895 1,340 2,230 3,720 6,695

900 50 440 590 885 1,325 2,210 3,680 6,625
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 355 475 715 1,070 1,785 2,970 5,350
1050 20(l) 315 415 625 940 1,565 2,605 4,690

1100 20(l) 270 360 545 815 1,360 2,265 4,075

1150 20(l) 235 315 475 710 1,185 1,970 3,550
1200 20(l) 185 245 370 555 925 1,545 2,775
1250 20(l) 140 185 280 420 705 1,170 2,110
1300 20(l) 110 145 220 330 550 915 1,645

1350 20(l) 85 115 170 255 430 715 1,285

1400 20(l) 65 85 130 195 325 545 975
1450 20(l) 50 70 105 155 255 430 770
1500 20(l) 40 50 75 115 190 315 565
NOTE:
(I) For welding end valves only. Flanged end ratings terminate at 1000°F.

58
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-2.4 (CONT’D)

RATINGS FOR GROUP 2.4 MATERIALS
A 162 Gr. F321 (2) A 312 Gr. TP321 (2) A 376 Gr. TP321 (2) A 430 Gr. FP321H
A 162 Gr. F321H (1) A 312 Gr. TP321H A 376 Gr. TP32 1H A 479 Gr. 321 (2)
A 240 Gr. 321 (2) A 356 Gr. 321 (2) A 430 Gr. FP321 (2) A 479 Gr. 321H
A 240 Gr. 321H (1)

NOTES:
(1) At temperatures over lOOO”F, use only if the material is heat treated by heating to a minimum
temperature of 2000°F.
(2) Not to be used over 1000°F.

TABLE 2-2.48 SPECIAL CLASS

l- rrkina Pressures bv Classe 8. Psi9

Temperature, “F 150 300 400 600 900 1500 2500 4596

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 660 910 1,365 2,045 3,405 5,660 10,220
300 235 610 610 1,215 1,625 3,045 5,070 9,130
400 210 555 735 1,105 1,660 2,765 4,605 6,295
500 195 515 665 1,030 1,545 2,570 4,285 7,715

600 165 490 650 975 1,465 2,445 4,070 7,330

650 165 460 640 960 1,440 2,400 4,000 7,200
700 160 470 630 945 1,415 2,355 3,930 7,070
750 160 465 625 935 1,400 2,335 3,695 7,005
600 175 465 615 925 1,390 2,315 3,655 6,945

650 175 460 610 915 1,375 2,295 3,820 6,680

900 175 455 605 910 1,365 2,270 3.785 6,615
950 175 455 605 910 1,365 2,270 3,765 6,815
1000 160 420 560 640 1,260 2,105 3,505 6,310
1050 155 405 545 615 1,220 2,035 3,395 6,105

1100 135 355 470 705 1,060 1,770 2,945 5,305

1150 115 295 395 590 665 1,460 2,465 4,435
1200 90 230 310 465 695 1,155 1,930 3,470
1250 65 175 235 350 525 660 1,465 2,635
1300 55 135 165 275 410 665 1,145 2,055

1350 40 105 145 215 320 535 695 1,605

1400 30 60 110 165 245 405 680 1,220
1450 25 65 65 130 195 320 535 965
1500 20 45 65 95 140 235 395 705

59
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-2.5
RATINGS FOR GROUP 2.5 MATERIALS
A 182 Gr. F347 (2) A 240 Gr. 348 (2) A 351 Gr. CFIC (3) A 430 Gr. FP347 (2)
A 182 Gr. F347H (1) A 240 Gr. 348H (I) A 358 Gr. 347 (2) A 430 Gr. FP347H
A 182 Gr. F348 (2) A 312 Gr. TP347 (2) A 376 Gr. TP347 (2) A 479 Gr. 347 (2)
A 182 Gr. F348H (1) A 312 Gr. TP347H A 376 Gr. TP347H A 479 Gr. 347H
A 240 Gr. 347 (2) A 312 Gr. TP348 (2) A 378 Gr. TP348 (2) A 479 Gr. 348 (2)
A 240 Gr. 347H (1) A 312 Gr. TP348H A 479 Gr. 348H

NOTES:
(1) For temperatures over lOOO”F, use only if the material is heat treated by heating to a minimum
temperature of 2000°F.
(2) Not to be used over 1000°F.
(3) At temperatures over lOOo”F, use the material only when the carbon content is 0.04% or higher.

TABLE 2-2.5A STANDARD CLASS

l- Working Pressures bv Classe 5. psi9
Temperature, “F 150 300 400 l-=-- 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,180 3,600 6,000 10,800
200 255 660 880 1,320 1,980 3,300 5,500 9,900
300 230 615 820 1,230 1,845 3,070 5,120 9,215
400 200 575 765 1,145 1,720 2,870 4,780 8,605
500 170 540 720 1,080 1,620 2,700 4,500 8,100

600 140 515 685 1,025 1,540 2,570 4,280 7,705

650 125 505 670 1,010 1,510 2,520 4,200 7,560
700 110 495 660 990 1,485 2,470 4,120 7,415
750 95 490 655 985 1,475 2,460 4,100 7,380
800 80 485 650 975 1,460 2,435 4,060 7,310

850 65 485 645 970 1,455 2,425 4,040 7,270

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 20(l) 325 430 845 965 1,610 2,685 4,835

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 170 230 345 515 855 1,430 2,570
1250 20(l) 125 165 245 370 615 1,030 1,850
1300 20(l) 95 125 185 280 465 770 1,390

1350 20(l) 70 90 135 205 345 570 1,030

1400 20(l) 55 75 110 165 275 455 825
1450 15(l) 40 55 80 125 205 345 615
1500 15(l) 35 45 70 105 170 285 515
NOTE:
(I) For welding end valves only. Flanged end ratings terminate at 1000°F.

60
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-2.5 (CONT’D)

RATINGS FOR GROUP 2.5 MATERIALS
A 162 Gr. F347 (2) A 240 Gr. 346 (2) A 351 Gr. CF6C (3) A 430 Gr. FP347 (2)
A 162 Gr. F347H (1) A 240 Gr. 348H (1) A 358 Gr. 347 (2) A 430 Gr. FP347H
A 182 Gr. F348 (2) A 312 Gr. TP347 (2) A 376 Gr. TP347 (2) A 479 Gr. 347 (2)
A 182 Gr. F348H (I) A 312 Gr. TP347H A 376 Gr. TP347H A 479 Gr. 347H
A 240 Gr. 347 (2) A 312 Gr. TP348 (2) A 376 Gr. TP348 (2) A 479 Gr. 348 (2)
A 240 Gr. 347H (1) A 312 Gr. TP348H A 479 Gr. 348H

NOTES:
(1) For temperatures over lOOO”F, use only if the material is heat treated by heating to a minimum
temperature of 2000°F.
(2) Not to be used over 1000°F.
(3) At temperatures over lOOo”F, use the material only when the carbon content is 0.04% or higher.

TABLE 2-2.5B SPECIAL CLASS

r Workins Pressures by Classes, Psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 275 715 955 1,430 2,145 3,580 5,965 10,735
300 250 655 875 1,310 1,965 3,280 5,465 9,835
400 235 615 825 1,235 1,850 3,085 5,145 9,255
500 230 595 795 1,190 1,785 2,980 4,965 8,935

600 220 575 765 1,145 1,720 2,865 4,775 8,600

650 215 565 750 1,125 1,690 2,815 4,690 6,440
700 210 550 735 1,105 1,655 2,760 4,600 8,275
750 210 550 730 1,095 1,645 2,745 4,570 8,230
800 210 545 725 1,090 1,630 2,720 4,530 8,155

850 205 540 720 1,080 1,625 2,705 4,510 8,115

900 205 540 720 1,075 1,615 2,690 4,485 6,075
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 155 405 540 805 1,210 2,015 3,360 6,045

1150 130 345 455 685 1,030 1,715 2,855 5,145
1200 80 215 285 430 645 1,070 1,785 3,215
1250 60 155 205 310 465 770 1,285 2,315
1300 45 115 155 230 345 580 965 1,735

1350 35 85 115 170 255 430 715 1,285

1400 25 70 90 135 205 345 570 1,030
1450 20 50 70 105 155 255 430 770
1500 15 45 55 85 130 215 355 645

61
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-2.6
RATINGS FOR GROUP 2.6 MATERIALS
A 240 Gr. 309s (l)(2)(3) A 351 Gr. CH8 (1) A 351 Gr. CH20 (1) A 358 Gr. 309H
A 312 Gr. TP309H A 240 Gr. 309H

NOTES:
(1) At temperatures over 1000°F. use only when the carbon content is 0.04% or higher.
(2) For temperatures above lOOo”F, use only if the material is solution heat treated to the minimum
temperature specified in the material specification but not lower than 1900°F and quenching
in water or rapidly cooling by other means.
(3) This material should be used for service temperatures 1050°F and above only when assurance
is provided that grain size is not finer than ASTM 6.

TABLE 2-2.6A STANDARD CLASS

r Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 260 670 895 1,345 2,015 3,360 5,600 10,080
200 230 605 805 1,210 1,815 3,025 5,040 9,070
300 220 570 760 1,140 1,705 2,845 4,740 8,530
400 200 535 710 1,065 1,600 2,665 4,440 7,990
500 170 505 670 1,010 1,510 2,520 4,200 7,580

600 140 480 635 955 1,435 2,390 3,980 7,165

650 125 465 620 930 1,395 2,330 3,880 6,985
700 110 455 610 910 1,370 2,280 3,800 6,840
750 95 445 595 895 1,340 2,230 3,720 6,695
800 80 435 580 870 1,305 2,170 3,620 6,515

850 65 425 565 850 1,275 2,125 3,540 6,370

900 50 415 555 830 1,245 2,075 3,460 6,230
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 335 450 670 1,010 1,680 2,800 5,040
1050 20(l) 290 390 585 875 1,460 2,430 4,370

1100 20(l) 225 300 445 670 1,115 1,860 3,345

1150 20(l) 170 230 345 515 860 1,430 2,570
1200 20(l) 130 175 260 390 650 1,085 1,955
1250 20(l) 100 135 200 300 495 830 1,490
1300 20(l) 80 105 160 235 395 660 1,185

1350 20(l) 60 80 115 175 290 485 875

1400 20(l) 45 60 90 135 225 370 870
1450 IO(l) 30 40 60 95 155 260 485
1500 10(l) 25 30 50 70 120 200 360

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

62
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-2.6 (CONT’D)

RATINGS FOR GROUP 2.6 MATERIALS
A 240 Gr. 309s (l)(2)(3) A 351 Gr. CH8 (1) A 351 Gr. CH20 (1) A 358 Gr. 309H
A 312 Gr. TP309H A 240 Gr. 309H

NOTES:
(1) At temperatures over lOOO”F, use only when the carbon content is 0.04% or higher.
(2) For temperatures above lOOO”F, use only if the material is solution heat treated to the minimum
temperature specified in the material specification but not lower than 1900°F and quenching
in water or rapidly cooling by other means.
(3) This material should be used for service temperatures 1050°F and above only when assurance
is provided that grain size is not finer than ASTM 6.

TABLE 2-2.6B SPECIAL CLASS

-r Workina Pressures bv Classc , psi9
Temperature, “F 150 300 400 l-=- 600 900 1500 2500 4500

-20 to 100 265 695 925 1,390 2,085 3,470 5,785 10,415
200 245 640 850 1,280 1,915 3,195 5,320 9,580
300 235 610 810 1,220 1,825 3,045 5,070 9,130
400 225 590 785 1,175 1,760 2,935 4,895 8,810
500 215 560 750 1,125 1,685 2,810 4,680 8,420

600 205 535 710 1,065 1,600 2,665 4,445 7,995

650 200 520 695 1,040 1,560 2,600 4,330 7,795
700 195 505 675 1,010 1,520 2,530 4,215 7,585
750 190 500 665 995 1,495 2,490 4,150 7,475
800 185 485 645 970 1,455 2,420 4,035 7,265

850 180 475 635 950 1,425 2,370 3,950 7,110

900 180 465 620 925 1,390 2,315 3,860 6,945
950 175 450 600 900 1,350 2,250 3,750 6,750
1000 160 420 560 840 1,260 2,100 3,500 6,300
1050 140 365 485 730 1,095 1,820 3,035 5,465

1100 105 280 370 560 835 1,395 2,320 4,180

1150 85 215 285 430 645 1,070 1,785 3,215
1200 60 165 215 325 490 815 1,355 2,445
1250 50 125 165 250 375 620 1,035 1,665
1300 40 100 130 200 295 495 820 1,480

1350 30 75 100 145 220 365 610 1,095

1400 20 55 75 110 170 280 465 835
1450 15 40 50 75 115 195 320 580
1500 10 30 40 60 90 150 250 450

63
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-2.7
RATINGS FOR GROUP 2.7 MATERIALS
A 162 Gr. F310H A 312 Gr. TPBIOH A 356 Gr. 310H A 479 Gr. 310s (l)(2)(3)
A 240 Gr. 310s (l)(2)(3) A 351 Gr. CK20 (I)
A 240 Gr. 310H A 479 Gr. 310H

NOTES:
(1) At temperatures over lOOO”F, use only when the carbon content is 0.04% or higher.
(2) For temperatures above lOOO”F, use only if the material is solution heat treated to the minimum
temperature specified in the material specification but not lower than 1900°F and quenching
in water or rapidly cooling by other means.
(3) Service temperatures of 1050°F and above should be used only when assurance is provided
that grain size is not finer than ASTM 6.

TABLE 2-2.7A STANDARD CLASS

r Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 260 670 895 1,345 2,015 3,360 5,600 10,080
200 235 605 810 1,215 1,820 3,035 5,060 9,110
300 220 570 760 1,140 1,705 2,845 4,740 8,530
400 200 535 715 1,070 1,605 2,675 4,480 8,030
500 170 505 675 1,015 1,520 2,530 4,220 7,595

600 140 460 640 960 1,440 2,400 4,000 7,200

650 125 470 625 935 1,405 2,340 3,900 7,020
700 110 455 610 910 1,370 2,280 3,800 6,840
750 95 450 600 900 1,345 2,245 3,740 6,730
600 60 435 580 875 1,310 2,185 3,640 6,550

650 65 425 570 855 1,280 2,135 3,560 6,410

900 50 420 555 835 1,255 2,090 3,480 6,265
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 345 460 685 1,030 1,720 2,865 5,155
1050 20(l) 335 450 670 1,010 1,680 2,800 5,040

1100 20(l) 260 345 520 780 1,305 2,170 3,910

1150 20(l) 190 250 375 565 945 1,570 2,830
1200 20(l) 135 185 275 410 685 1,145 2,055
1250 20(l) 105 135 205 310 515 855 1,545
1300 20(l) 75 100 150 225 375 630 1,130

1350 20(l) 60 80 115 175 290 485 875

1400 20(l) 45 60 90 135 225 370 670
1450 JO(l) 35 45 65 100 165 275 500
1500 IO(l) 25 35 50 75 130 215 385
L

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

64
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-2.7 (CONT’D)

RATINGS FOR GROUP 2.7 MATERIALS
A 182 Gr. F310H A 312 Gr. TP310H A 358 Gr. 310H A 479 Gr. 310s (l)(2)(3)
A 240 Gr. 310s (l)(2)(3) A 351 Gr. CK20 (I)
A 240 Gr. 310H A 479 Gr. 310H

NOTES:
(I) At temperatures over lOOO”F, use only when the carbon content is 0.04% or higher.
(2) For temperatures above lOOO”F, use only if the material is solution heat treated to the
minimum temperature specified in the material specification but not lower than 1900°F and
quenching in water or rapidly cooling by other means.
(3) Service temperatures of 1050°F and above should be used only when assurance is provided
that grain size is not finer than ASTM 6.

TABLE 2-2.7B SPECIAL CLASS

Working Pressures bv Classes, wig-

Temperature, F
‘ 150 300 400 600 900 1500 2500 4500

-20 to 100 270 700 930 1,395 2,095 3,495 5,820 10,480
200 245 640 850 1,275 1,915 3,195 5,320 9,580
300 235 610 810 1,215 1,825 3,045 5,070 9,130
400 225 590 790 1,185 1,775 2,955 4,930 8,870
500 215 565 755 1,130 1,695 2,825 4,710 8,480

600 205 535 715 1,070 1,605 2,680 4,465 8,035

650 200 520 695 1,045 1,565 2,610 4,355 7,835
700 195 510 680 1,020 1,525 2,545 4,240 7,635
750 190 500 670 1,000 1,505 2,505 4,175 7,515
800 185 490 650 975 1,465 2,440 4,065 7,315

850 180 475 635 950 1,425 2,380 3,965 7,135

900 180 465 620 930 1,400 2,330 3,885 6,990
950 175 455 605 910 1,365 2,270 3,785 6,815
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,100 3,500 6,300

1100 125 325 435 650 975 1,630 2,715 4,885

1150 90 235 315 470 705 1,180 1,965 3,535
1200 65 170 230 345 515 855 1,430 2,570
1250 50 130 170 255 385 645 1,070 1,930
1300 35 95 125 190 285 470 785 1,415

1350 30 75 95 145 220 365 605 1,095

1400 20 55 75 110 165 280 465 835
1450 15 40 55 85 125 210 345 625
1500 10 30 45 65 95 160 270 480

65
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

TABLE 2-2.8
RATINGS FOR GROUP 2.8 MATERIALS
A 182 Gr. F44 A 182 Gr. F53 (I) A 240 Gr. S31254 A 351 Gr. CK3MCuN
A 182 Gr. F51 (1) A 182 Gr. S32760 (1) A 240 Gr. S31803 (I) A 240 Gr. S32750 (1) A 351 Gr. CE8MN (I)
A 479 Gr. S31254 A 240 Gr. S32760 (I) A 479 Gr. S31803 (1) A 479 Gr. S32750 (1) A 351 Gr. CD4MCu (I)
A 312 Gr. S31254 A 789 Gr. S32760 (I) A 789 Gr. S31803 (I) A 789 Gr. S32750 (1) A 351 Gr. CD3MWCuN (1)
A 358 Gr. S31254 A 790 Gr. S32760 (I) A 790 Gr. S31803 (I) A 790 Gr. S52750 (1)

NOTE:
(1) This steel may become brittle after service at moderately elevated temperatures. Not to be used over 600°F.

TABLE 2-2.8A STANDARD CLASS

Working Pressures by Classes, psig

Temperature, F
‘ 150 1 300 400 680 900 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 720 960 1,440 2,160 3,600 6,000 10,800
300 230 665 885 1,330 1,995 3,325 5,540 9,970
400 200 615 820 1,230 1,845 3,070 5,120 9,215
500 170 575 770 1,150 1,730 2,880 4,800 8,640

600 140 555 740 1,115 1,670 2,785 4,640 8,350

650 125 550 735 1,100 1,650 2,750 4,580 8,245
700 110 540 725 1,085 1,625 2,710 4,520 8,135
750 95 530 710 1,065 1,595 2,660 4,430 7,970

TABLE 2-2.8B SPECIAL CLASS

Working Pressures by Classes, psig

Temoerature. F
‘ 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 285 740 990 1,485 2,225 3,710 6,185 11,130
400 265 685 915 1,370 2,055 3,430 5,715 10,285
500 245 645 855 1,285 1,930 3,215 5,355 9.645

600 240 620 830 1,245 1,865 3,105 5,180 9,320

650 235 615 820 1,225 1,840 3,065 5,110 9,200
700 230 605 805 1,210 1,815 3,025 5,045 9,080
750 230 595 795 1,195 1,790 2,985 4,980 8,960

66
VALVES - FLANGED,
THREADED,ANDWELDlNG END ASME B16.34a-1998

TABLE 2-3.1 (4
RATINGS FOR GROUP 3.1 MATERIALS
B463Gr.N08020(1) B 468 Gr.NO8020 (I) B 473 Gr. NO8020 (1)
B 462 Gr. NO8020 (1) B464Gr.N08020(1)

NOTE:
(I) Use annealed material only.

TABLE 2-3.1A STANDARD CLASS (aI

Working Pressures by Classes, psig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 720 960 1,440 2,160 3,600 6,000 10,800
300 230 715 950 1,425 2,140 3,565 5,940 10,690
400 200 675 900 1,345 2,020 3,365 5,610 10,100
500 170 655 875 1,310 1,965 3,275 5,460 9,830

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

TABLE 2-3.1B SPECIAL CLASS (4

T Working Pressures byClasses,psig

Temuerature.OF 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 280 730 975 1,465 2,195 3,655 6,095 10,970

600 270 705 940 1,405 2,110 3,515 5,860 10,545

650 270 700 930 1,400 2,095 3,495 5,825 10,485
700 265 695 925 1,390 2,085 3,475 5,790 10,425
750 260 685 910 1,365 2,050 3,415 5,690 10,245
800 260 675 900 1,350 2,025 3,375 5,625 10,125

67
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

TABLE 2-3.2
RATINGS FOR GROUP 3.2 MATERIALS
B 160 Gr. NO2200 (l)(2) B 161 Gr. N02200(1) B 162 Gr. NO2200 (I) B 163 Gr. NO2200 (1)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirementsshall conform totheapplicableASTM specification.The manufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.2A STANDARD CLASS

Working Pressures by Classes,psig

Temperature,'F 150 300 400 600 900 1500 2500 4500

-20 to 100 140 360 480 720 1,080 1,800 3,000 5,400
200 140 360 480 720 1,080 1,800 3,000 5,400
300 140 360 480 720 1,080 1,800 3,000 5,400
400 140 360 480 720 1,080 1,800 3,000 5,400
500 140 360 480 720 1,080 1,800 3,000 5,400

140 360 480 720 1,080 1,800 3,000 5,400

TABLE 2-3.2B SPECIAL CLASS

Working Pressures byClasses,psig

Temperature,'F 1 150 300 400 600 900 1500 2500 4500

-2oto 100 155 400 535 805 1,205 2,010 3,350 6,025
200 155 400 535 805 1,205 2,010 3,350 6,025
300 155 400 535 805 1,205 2,010 3,350 6,025
400 155 400 535 805 1,205 2,010 3,350 6,025
500 155 400 535 805 1,205 2,010 3,350 6,025

600 1 155 400 535 805 1,205 2,010 3,350 6,025

68
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-3.3
RATINGS FOR GROUP 3.3 MATERIALS
B 160 Gr. NO2201 (l)(2) B 162 Gr. NO2201 (1)

NOTES:
(I) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirementsshall conform totheapplicableASTM specification.Themanufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.3A STANDARD CLASS

T Workinq Pressures bv Class1 Psi9
Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 90 240 320 480 720 1,200 2,000 3,600

200 85 230 305 455 685 1,140 1,900 3,420
300 85 225 300 445 670 1,115 1,860 3,350
400 85 215 290 430 650 1,080 1,800 3,240
500 85 215 290 430 650 1,080 1,800 3,240

600 85 215 290 430 650 1,080 1,800 3,240

650 85 215 290 430 650 1,080 1,800 3,240
700 85 215 290 430 650 1,080 1,800 3,240
750 80 210 280 420 635 1,055 1,760 3,170
800 80 205 270 410 610 1,020 1,700 3,060

850 65 205 270 410 610 1,020 1,700 3,060

900 50 140 185 280 415 695 1,155 2,085
950 35 115 150 230 345 570 950 1,715
1000 20 95 125 185 280 465 770 1,390
1050 2011) 75 100 150 220 370 615 1,100

1100 20(l) 60 80 125 185 310 515 925

1150 20(l) 45 60 95 140 230 385 695
1200 15(l) 35 50 75 110 185 310 555

NOTE:
(I) For welding end valves only. Flanged end ratings terminate at 1000°F.

69
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

TABLE 2-3.3 (CONT’D)

RATINGS FOR GROUP 3.3 MATERIALS
B 160 Gr. NO2201 (l)(2) B 162 Gr. NO2201 (1)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
andgrainsizerequirementsshall conform totheapplicableASTMspecification.Themanufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

(4 TABLE 2-3.3B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature, OF 150 300 400 600 900 1500 2500 4500

-20 to 100 105 270 355 535 805 1,340 2,230 4,020
200 100 255 340 510 765 1,270 2,120 3,815
300 95 250 330 500 745 1,245 2,075 3,735
400 90 240 320 480 725 1,205 2,010 3,615
500 90 240 320 480 725 1,205 2,010 3,615

600 90 240 320 480 725 1,205 2,010 3,615

650 90 240 320 480 725 1,205 2,010 3,615
700 90 240 320 480 725 1,205 2,010 3,615
750 90 235 315 470 705 1,180 1,965 3,535
800 85 230 305 455 685 1,140 1,895 3,415

850 85 230 305 455 685 1,140 1,895 3,415

900 70 180 240 360 540 905 1,505 2,710
950 55 150 200 295 445 745 1,240 2,230
1000 45 120 160 240 360 605 1,005 1,810
1050 35 95 130 195 290 480 805 1,445

1100 30 80 105 160 240 400 670 1,205

1150 25 60 80 120 180 300 500 905
1200 20 50 65 95 145 240 400 725

70
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-3.4
RATINGS FOR GROUP 3.4 MATERIALS
B 127 Gr. NO4400 (I) B 164 Gr. NO4400 (1) B 165 Gr. NO4400 (I) B 564 Gr. NO4400 (1)
B 163 Gr. NO4400 (I) B 164Gr. NO4405 (l)(2)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirements shall conform to the applicable ASTM specification. The manufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.4A STANDARD CLASS

T Working Pressures bv Classe !S. wig
Temperature, F
‘ 150 300 400 600 900 1500 2500

-20 to 100 230 600 800 1,200 1,800 3,000 5,000 9,000
200 200 530 705 1,055 1,585 2,640 4,400 7,920
300 190 495 660 990 1,485 2,470 4,120 7,415
400 185 480 635 955 1,435 2,390 3,980 7,165
500 170 475 635 950 1,435 2,375 3,960 7,130

600 140 475 635 950 1,435 2,375 3,960 7,130

650 125 475 635 950 1,435 2,375 3,960 7,130
700 110 475 635 950 1,435 2,375 3,960 7,130
750 95 470 625 935 1,405 2,340 3,900 7,020
800 80 460 610 915 1,375 2,290 3,820 6,875

850 65 340 455 680 1,020 1,695 2,830 5,090

900 50 245 330 495 740 1,235 2,055 3,705

TABLE 2-3.4B SPECIAL CLASS ’

T- Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 255 670 895 1,340 2,010 3,350 5,580 10,045
200 225 590 785 1,180 1,770 2,945 4,910 8,840
300 210 550 735 1,100 1,650 2,755 4,590 8,260
400 205 535 710 1,065 1,600 2,665 4,440 7,995
500 205 530 710 1,060 1,590 2,650 4,420 7,955

600 205 530 710 1,060 1,590 2,650 4,420 7,955

650 205 530 710 1,060 1,590 2,650 4,420 7,955
700 205 530 710 1,060 1,590 2,650 4,420 7,955
750 200 520 695 1,045 1,565 2,610 4,355 7,835
800 195 510 680 1,025 1,535 2,560 4,265 7,675

850 170 440 590 885 1,325 2,210 3,685 6,630

900 125 320 430 645 965 1,605 2,680 4,820

71
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED,ANDWELDlNG END

TABLE 2-3.5
RATINGS FOR GROUP 3.5 MATERIALS
B 163 Gr. NO6600(1) B 167 Gr. NO6600 (1) B 168 Gr.N06600(1) B 564Gr. NO6600 (1)
B 166 Gr.N06600(1)

NOTE:
(I) Use annealed material only.

(a) TABLE 2-3.5A STANDARD CLASS

l-
I Working Pressures by Classe! lsig

Temperature,'F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 325 435 655 980 1,635 2,725 4,905
1000 20 215 290 430 650 1,080 1,800 3,240
1050 20(l) 140 185 280 415 695 1,155 2,085

1100 20(l) 95 125 185 280 465 770 1,390

1150 20(l) 70 90 135 205 340 565 1,020
1200 20(l) 60 80 125 185 310 515 925

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

TABLE 2-3.5B SPECIAL CLASS

l- Working Pressures bv Classe !S, Psi9
Temperature,'F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 285 745 995 1,495 2,240 3,735 6,230 11,210

650 280 735 980 1,470 2,200 3,670 6,115 11,010
700 275 725 965 1,445 2,170 3,615 6,025 10,850
750 270 710 945 1,420 2,130 3,550 5,915 10,645
800 270 700 930 1,400 2,095 3,495 5,825 10,485

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 165 425 570 850 1,280 2,130 3,550 6,390
1000 110 280 375 565 845 1,405 2,345 4,220
1050 70 180 240 360 540 905 1,505 2,710

1100 45 120 160 240 360 605 1,005 1,810

1150 35 90 120 175 265 440 735 1,325
1200 30 80 105 160 240 400 670 1,205

72
VALVES-FLANGED
THREADED,ANDWELDlNG END ASME 816.34-1996

TABLE 2-3.6
RATINGS FOR GROUP 3.6 MATERIALS
B 163Gr.N08800(1) B 408 Gr.N08800(1) B 409 Gr. NO8800 (1) B 564 Gr.NO8800 (1)

NOTE:
(I) Use annealed material only.

TABLE 2-3.6A STANDARD CLASS

Working Pressures by Classes, psig

Temperature,'F 150 300 400 600 900 1500 2500 4500

-2oto 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 255 680 885 1,325 1,990 3,310 5,520 9,935
300 230 625 830 1,250 1,870 3,120 5,200 9,360
400 200 600 800 1,200 1,800 3,000 5,000 9,000
500 170 580 770 1,155 1,735 2,890 4,820 8,875

600 140 575 765 1,145 1,720 2,870 4,780 8,605

650 125 570 760 1,140 1,705 2,845 4,740 8,530
700 110 565 750 1,130 1,690 2,820 4,700 8,460
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 505 675 1,015 1,520 2,535 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 20(l) 325 430 645 965 1,610 2,685 4,835

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 205 270 405 610 1,020 1,695 3,055
1250 20(l) 130 175 260 390 650 1,080 1,945
1300 20(l) 60 80 125 185 310 515 925

1350 20(l) 50 65 100 150 245 410 740

1400 15(l) 35 45 70 100 170 285 510
1450 10(l) 30 40 60 95 155 255 465
1500 JO(l) 25 35 50 75 125 205 370
L

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

73
 VALVES-FLANGED,
ASME 816.34-1996 THF?EADED,ANDWELDlNG END

TABLE 2-3.6 (CONT’D)

RATINGS FOR GROUP 3.6 MATERIALS
B 163 Gr. NO6600(1) B406 Gr.NO6600 (1) B 409 Gr. NO6600(1) B 564 Gr. NOB600(1)

NOTE:
(1) Use annealed material only.

TABLE 2-3.6B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 285 740 985 1,480 2,220 3,695 6,160 11,090
300 265 695 930 1,395 2,090 3,480 5,805 10,445
400 255 670 895 1,340 2,010 3,350 5,580 10,045
500 245 645 860 1,290 1,935 3,230 5,380 9,685

600 245 640 855 1,260 1,920 3,200 5,335 9,805

650 245 635 845 1,270 1,905 3,175 5,290 9,520
700 240 630 840 1,260 1,890 3,145 5,245 9,440
750 240 625 830 1,250 1,870 3,120 5,200 9,360
800 235 615 820 1,230 1,850 3,080 5,135 9,240

850 235 615 820 1,230 1,845 3,075 5,125 9,220

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 640 1,260 2,105 3,505 8,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 155 405 540 805 1,210 2,015 3,360 6,045

1150 130 345 460 685 1,030 1,715 2,860 5,145
1200 100 260 345 515 770 1,285 2,145 3,860
1250 65 170 225 335 505 845 1,405 2,530
1300 30 80 105 160 240 400 670 1,205

1350 25 65 85 130 195 320 535 965

1400 15 45 60 90 135 220 370 665
1450 15 40 55 80 120 200 335 605
1500 10 30 45 65 95 160 270 480

74
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-3.7
RATINGS FOR GROUP 3.7 MATERIALS
B 333 Gr. N10665 (I) B 335 Gr. N10665 (l)(2) B 622 Gr. N10665 (1)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
andgrainsizerequirementsshallconformtotheapplicableASTMspecification.Themanufac-
turing procedures,tolerances,tests,certification,and markings shall be in accordance with
ASTM 8564.

TABLE 2-3.7A STANDARD CLASS

T- Working Pressures by Classc Psi9
Temperature, F
‘ 150 I 300 400 606 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1.015 1.525 2.540 4.230 7.610

TABLE 2-3.7B SPECIAL CLASS (4

T Working Pressures bv Classes, Psi9
Temperature, “F 150 300 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,665 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6.000 10.800

75
 VALVES - FLANGED,
ASME 616.34a-1998 THREADED, AND WELDING END

TABLE 2-3.8
RATINGS FOR GROUP 3.8 MATERIALS
B 333 Gr. NIOOOI (l)(6) B 434 Gr. N10003 (3) B 564 Gr. N10276 (l)(4) B 575 Gr. N10276 (l)(4)
B 335 Gr. NlOOOl (l)(2)(6) B 443 Gr. NO6625 (3)(5) B 573 Gr. N10003 (2)(3) B 622 Gr. NO6455 (l)(6)
B 423 Gr. NO8825 (3)(7) B 446 Gr. NO6625 (3)(5) B 574 Gr. NO6455 (l)(2)(6) B 622 Gr. NlOOOl (3)(6)
B 424 Gr. NO8825 (3)(7) B 564 Gr. NO6625 (3)(5) B 574 Gr. N10276 (l)(2)(4) B 622 Gr. N10276 (l)(4)
B 425 Gr. NO8825 (2)(3)(7) B 564 Gr. NO8825 (3)(7) B 575 Gr. NO6455 (l)(6)

NOTES:
(I) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and grain
size requirements shall conform to the applicable ASTM specification. The manufacturing procedures,
tolerances, tests, certification, and markings shall be in accordance with ASTM B 564.
(3) Use annealed material only.
(4) Not to be used over 1250°F.
(5) Not to be used over 1200°F. Alloy NO6625 in the annealed condition is subject to severe loss of impact
strength at room temperatures after exposure in the range of 1000°F to 1400°F.
(6) Not to be used over 800°F.
(7) Not to be used over 1000°F.

TABLE 2-3.8A STANDARD CLASS

Working Pressures bv Classesi, Psi9
I

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 20(l) 325 430 645 965 1,610 2,685 4,835

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 185 245 370 555 925 1,545 2,775
1250 20(l) 145 195 295 440 735 1,220 2,200
1300 20(l) 110 145 215 325 540 900 1,620

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

76
VALVES - FLANGED
THREADED, AND WELDING END ASME B16.34-1996

TABLE 2-3.8 (CONT’D)

RATINGS FOR GROUP 3.8 MATERIALS
B 333 Gr. NlOOOl (l)(6) B 434 Gr. N10003 (3) B 564 Gr. N10276 (l)(4) B 575 Gr. N10276 (l)(4)
B 335 Gr. NlOOOl (l)(2)(6) B 443 Gr. NO6625 (3)(5) B 573 Gr. N10003 (2)(3) B 622 Gr. NO6455 (l)(6)
B 423 Gr. NO6625 (3)(7) B 446 Gr. NO6625 (3)(5) B 574 Gr. NO6455 (l)(2)(6) B 622 Gr. NlOOOl (3)(6)
B 424 Gr. NO6625 (3)(7) B 564 Gr. NO6625 (3)(5) B 574 Gr. N10276 (l)(2)(4) B 622 Gr. N10276 (l)(4)
B 425 Gr. NO6625 (2)(3)(7) B 564 Gr. NO6625 (3)(7) B 575 Gr. NO6455 (l)(6)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and grain
size requirements shall conform to the applicable ASTM specification. The manufacturing procedures,
tolerances, tests, certification, and markings shall be in accordance with ASTM B 564.
(3) Use annealed material only.
(4) Not to be used over 1250°F.
(5) Not to be used over 1200°F. Alloy NO6625 in the annealed condition is subject to severe loss of impact
strength at room temperatures after exposure in the range of 1000°F to 1400°F.
(6) Not to be used over 600°F.
(7) Not to be used over 1000°F.

TABLE 2-3.8B SPECIAL CLASS

l-
Working Pressiures by ClasscIS, Psig
Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 265 740 990 1,465 2,225 3,710 6,165 11,130

600 275 725 965 1,445 2,170 3,615 6,025 10,650

650 270 710 945 1,420 2,130 3,550 5,915 10,645
700 265 695 930 1,395 2,090 3,460 5,605 10,445
750 265 690 920 1,360 2,075 3,455 5,760 10,365
600 265 665 915 1,370 2,055 3,430 5,715 10,265

650 260 675 900 1,350 2,025 3,375 5,625 10,125

900 230 600 600 1,200 1,600 3,000 5,000 9,000
950 160 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 640 1,260 2,105 3,505 6,310
1050 160 420 560 640 1,260 2,105 3,505 6,310

1100 155 405 540 605 1,210 2,015 3,360 6,045

1150 130 345 460 665 1,030 1,715 2,660 5,145
1200 90 240 320 460 725 1,205 2,010 3,615
1250 75 190 255 360 575 955 1,590 2,865
1300 55 140 190 260 420 705 1,170 2,110
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-3.9
RATINGS FOR GROUP 3.9 MATERIALS
B 435 Gr. NO6002 (I) B 572 Gr. NO6002 (l)(2) B 622 Gr. NO6002 (1)

NOTES:
(1) Use solution annealed material only.
(4 For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.9A STANDARD CLASS

T Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 680 905 1,360 2,040 3,395 5,660 10,190
400 200 600 795 1,195 1,795 2,990 4,980 8,965
500 170 575 770 1,150 1,730 2,880 4,800 8,640

600 140 560 745 1,120 1,680 2,795 4,660 8,390

650 125 560 745 1,120 1,680 2,795 4,660 8,390
700 110 560 745 1,120 1,680 2,795 4,660 8,390
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 2011) 325 430 645 965 1,610 2,685 4,835

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 205 275 410 620 1,030 1,715 3,085
1250 2011) 180 245 365 545 910 1,515 2,725
1300 20(l) 140 165 275 410 685 1,145 2,060

1350 20(l) 105 140 205 310 515 860 1,545

1400 20(l) 75 100 150 225 380 630 1,130
1450 2011) 60 80 115 175 290 485 875
1500 20(l) 40 55 85 125 205 345 620

(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

78
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-3.9 (CONT’D)

RATINGS FOR GROUP 3.9 MATERIALS
B 435 Gr. NO6002 (1) B 572 Gr. NO6002 (l)(2) B 622 Gr. NO6002 (1)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirements shall conform to theapplicable ASTM specification.The manufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.9B SPECIAL CLASS

T Working Pressures bv Classes, psiq

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 255 665 890 1,335 2,000 3,335 5,560 10,005
500 245 645 855 1,285 1,930 3,215 5,355 9,645

600 240 625 830 1,250 1,870 3,120 5,200 9,360

650 240 625 830 1,250 1,870 3,120 5,200 9,360
700 240 625 830 1,250 1,870 3,120 5,200 9,360
750 240 625 830 1,250 1,870 3,120 5,200 9,360
800 240 625 830 1,250 1,870 3,120 5,200 9,360

850 225 585 780 1,175 1,760 2,935 4,890 8,800

900 225 585 775 1,165 1,750 2,915 4,855 8,740
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 155 405 540 805 1,210 2,015 3,360 6,045

1150 130 345 460 685 1,030 1,715 2,860 5,145
1200 100 260 345 515 770 1,285 2,145 3,860
1250 90 230 305 455 680 1,135 1,895 3,410
1300 65 170 230 345 515 860 1,430 2,570

1350 50 130 170 260 385 645 1,070 1,930

1400 35 95 125 190 285 470 785 1,415
1450 30 75 100 145 220 365 610 1,095
1500 20 50 70 105 155 260 430 770
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

TABLE 2-3.10
RATINGS FOR GROUP 3.10 MATERIALS
B 599 Gr. NO8700 (1) B 672 Gr. NO8700 (l)(2)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirements shall conform to the applicable ASTM specification. The manufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.10A STANDARD CLASS

T Working Pressures by Classes, psig

Temperature,'F 150 900 1500 2500 4500

-2oto 100 275 1,440 2,160 3,600 6,000 10,800

200 260 1,440 2,160 3,600 6,000 10,800
300 230 1,360 2,040 3,400 5,670 10,205
400 200 1,280 1,920 3,205 5,340 9,610
500 170 1,225 1,835 3,060 5,100 9,180

600 140 1,190 1,780 2,970 4,950 8,910

650 125 1,140 1,705 2,845 4,740 8,530

TABLE 2-3.10B SPECIAL CLASS

Working Pressures by Classe i, psig

Temperature,'F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 275 715 955 1,430 2,145 3,575 5,960 10,730
500 260 685 910 1,365 2,050 3,415 5,690 10,245

600 255 665 885 1,325 1,990 3,315 5,525 9,945

650 245 635 845 1,270 1,905 3,175 5,290 9,520

80
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-3.11
RATINGS FOR GROUP 3.11 MATERIALS
B 625 Gr. NO8904 (1) B 649 Gr. NO8904 (l)(2) B 677 Gr. NO8904 (1)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirementsshall conform to the applicable ASTM specification. The manufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.1 IA STANDARD CLASS

Working Pressures by Classes, psig

Temperature, “F 150 / 300 I 400 I 660 900 1500 1 2500 4500

-20 to 100 245 640 855 1,280 1,920 3,205 5,340 9,610
200 230 600 800 1,200 1,805 3,005 5,010 9,020
300 210 545 725 1,085 1,630 2,720 4,530 8,155
400 190 495 660 995 1,490 2,485 4,140 7,450
500 170 455 610 915 1,370 2,285 3,810 6,860

600 140 430 575 865 1,295 2,160 3,600 6,480

650 125 420 560 840 1,265 2,105 3,510 6,320
700 110 410 545 820 1,230 2,050 3,420 6,155

TABLE 2-3.11 B SPECIAL CLASS (4

Working Pressures by Classes, psig

Temperature, OF 1 150 390 400 I 600 968 1500 2500 4500

-20 to 100 275 715 955 1,430 2,145 3,575 5,960 10,730
200 255 670 895 1,340 2,015 3,355 5,590 10,065
300 235 605 810 1,215 1,820 3,035 5,055 9,100
400 215 555 740 1,110 1,665 2,770 4,620 8,315
500 195 510 680 1,020 1,530 2,550 4,250 7,655

600 185 480 645 965 1,445 2,410 4,020 7,230

650 180 470 625 940 1,410 2,350 3,915 7,050
700 175 460 610 915 1.375 2.290 3,815 6,870

81
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

TABLE 2-3.12
RATINGS FOR GROUP 3.12 MATERIALS
B 581 Gr. NO6985 (l)(2) B 582 Gr. NO6985 (1) B 620 Gr. NO8320 (I) B 621 Gr. NO8320 (l)(2)
B 622 Gr. NO6985 (1) B 622 Gr. NO8320 (1)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirements shall conform to theapplicableASTM specification. The manufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.12A STANDARD CLASS

T Working Pressures bv Classes, psin_

Temperature, F
‘ 150 300 I 400 600 900 1 1500 1 2500 1 4500

-20 to 100 260 670 895 1,345 2,015 3,360 5,600 10,080
200 240 625 830 1,245 1,870 3,115 5,190 9,340
300 225 585 780 1,175 1,760 2,935 4,890 8,800
400 200 535 715 1,075 1,610 2,680 4,470 8,045
500 170 500 665 1,000 1,500 2,500 4,170 7,505

600 140 475 635 950 1,425 2,375 3,960 7,130

650 125 465 620 930 1,395 2,320 3,870 6,965
700 110 450 600 900 1,350 2,250 3,750 6,750
750 95 445 590 885 1,330 2,215 3,690 6,640
800 80 430 575 865 1,295 2,160 3,600 6,480

TABLE 2-3.12B SPECIAL CLASS

Working Pressures by Classes, psig

Temperature, F
‘ 150 400 600 900 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 265 695 925 1,390 2,085 3,475 5,790 10,425
300 250 655 875 1,310 1,965 3,275 5,460 9,825
400 230 600 800 1,195 1,795 2,995 4,990 8,980
500 215 560 745 1,115 1,675 2,790 4,655 8,375

600 205 530 705 1,060 1,590 2,650 4,420 7,955

650 200 520 690 1,035 1,555 2,590 4,320 7,775
700 195 500 670 1,005 1,505 2,510 4,185 7,535
750 190 495 660 990 1,485 2,470 4,120 7,415
800 185 480 645 965 1,445 2,410 4,020 7,230

82
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-3.13
RATINGS FOR GROUP 3.13 MATERIALS
B 564 Gr. NO6031 (3) B 581 Gr. NO6975 (l)(2) B 582 Gr. NO6975 (1) B 622 Gr. NO6975 (1)
B 625 Gr. NO8031 (3) B 622 Gr. NO8031 (3) B 649 Gr. NO8031 (3)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.
(3) Use annealed material only.

TABLE 2-3.13A STANDARD CLASS

Working Pressures by Classes, psig
Temperature,"F 150 300 400 600 go0 1500 2500
I 1 I
-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 705 940 1,410 2,115 3,530 5,880 10,585
300 230 660 885 1,325 1,985 3,310 5,520 9,935
400 200 635 845 1,265 1,900 3,170 5,280 9,505
500 170 595 790 1,190 1,780 2,970 4,950 8,910

600 140 560 750 1,125 1,685 2,810 4,680 8,425

650 125 555 735 1,105 1,660 2,765 4,605 8,290
700 110 545 725 1,085 1,630 2,720 4,530 8,155
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

TABLE 2-3.13B SPECIAL CLASS

Workina Pressures bv ClassL Psi9
Temperature, OF 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 285 740 985 1,480 2,220 3,695 6,160 11,090
400 270 705 945 1,415 2,120 3,535 5,895 10,605
500 255 665 885 1,325 1,990 3,315 5,525 9,945

600 240 625 835 1,255 1,880 3,135 5,225 9,400

650 235 615 820 1,235 1,850 3,085 5,140 9,250
700 235 605 810 1,215 1,820 3,035 5,055 9,100
750 230 600 800 1,195 1,795 2,995 4,990 8,980
800 225 590 790 1,180 1,770 2,955 4,920 8,860

83
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-3.14
RATINGS FOR GROUP 3.14 MATERIALS
B 581 Gr. NO6007 (l)(2) B 582 Gr. NO6007 (1) B 622 Gr. NO6007 (1)

NOTES:
(1) Use solution annealed material only.
(2) Forforgings,thechemicalcomposition,mechanicalproperties,heattreating requirements,and
grain size requirementsshallconformtothe applicable ASTM specification.The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.14A STANDARD CLASS

Working Pressures bv Class , psi9
Temperature, "F 150 300 400 l-=- 600 900 1500 2500 4500

-2oto 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 245 645 860 1,290 1,935 3,230 5,380 9,685
300 230 600 795 1,195 1,795 2,990 4,980 8,965
400 200 560 750 1,125 1,685 2,810 4,680 8,426
500 170 535 715 1,070 1,605 2,675 4,460 8,030

600 140 520 690 1,035 1,555 2,590 4,320 7,775

650 125 510 680 1,020 1,535 2,555 4,260 7,670
700 110 505 675 1,015 1,520 2,530 4,220 7,595
750 95 500 670 1,005 1,505 2,510 4,180 7,525
800 80 495 660 995 1,490 2,485 4,140 7,450

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450

TABLE 2-3.14B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 275 720 960 1,440 2,160 3,605 6,005 10,810
300 255 665 890 1,335 2,000 3,335 5,560 10,005
400 240 625 835 1,255 1,880 3,135 5,225 9,400
500 230 595 795 1,195 1,790 2,985 4,980 8,960

600 220 580 770 1,155 1,735 2,895 4,820 8,680

650 220 570 760 1,140 1,710 2,855 4,755 8,560
700 215 565 755 1,130 1,695 2,825 4,710 8,480
750 215 560 745 1,120 1,680 2,800 4,665 8,395
800 215 555 740 1,110 1,665 2,770 4,620 8,315

850 210 550 735 1,100 1,650 2,750 4,585 8,255

900 210 545 730 1,095 1,640 2,730 4,555 8,195
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 840 1,260 2,105 3,505 6,310

84
VALVES - FLANGED,
THREADED.ANDWELDlNG END ASME B16.34a-1998

TABLE 2-3.15
RATINGS FOR GROUP 3.15 MATERIALS
B407 Gr. N08810(1) B 408 Gr. NO8810 (I) B 409 Gr.NO8810 (1) B 564 Gr.NO8810 (I)
A494 Gr.N-12MV(1)(2) A 494 Gr. CW-12MW (l)(2)

NOTES:
(I) Use solution annealed material only.
(2) Not to be used over 1000°F.

TABLE 2-3.15A STANDARD CLASS

l- Working Pressures bv Classe! i. I Bsig

Temperature,'F 150 300 400 600 900 1500 2500 4500

-2oto 100 230 600 800 1,200 1,800 3,000 5,000 9,000
200 205 540 720 1,080 1,620 2,700 4,500 8,100
300 195 505 675 1,015 1,520 2,530 4,220 7,595
400 185 480 640 960 1,440 2,400 4,000 7,200
500 170 455 610 910 1,370 2,280 3,800 6,840

600 140 440 585 880 1,320 2,195 3,660 6,590

650 125 425 565 850 1,275 2,125 3,540 6,370
700 110 420 560 840 1,260 2,100 3,500 6,300
750 95 415 550 825 1,240 2,065 3,440 6,190
800 80 410 545 815 1,225 2,040 3,400 6,120

850 65 400 530 795 1,195 1,990 3,320 5,975

900 50 395 530 790 1,190 1,980 3,300 5,940
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 325 435 650 975 1,625 2,710 4,875

1100 20(l) 320 430 640 965 1,605 2,675 4,815

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 205 275 410 620 1,030 1,715 3,085
1250 20(l) 180 245 365 545 910 1,515 2,725
1300 20(l) 140 185 275 410 685 1,145 2,060

1350 20(l) 105 140 205 310 515 860 1,545

1400 20(l) 75 100 150 225 380 630 1,130
1450 20(l) 60 80 115 175 290 485 875
1500 20(l) 40 55 85 125 205 345 620

NOTE:
(I) For welding end valves only. Flanged end ratings terminate at 1000°F.

85
 VALVES-FLANGED,
ASME B16.34a-1998 THREADED,ANDWELDlNGEND

TABLE 2-3.15 (CONT’D)

RATINGS FOR GROUP 3.15 MATERIALS
B 407 Gr. N08810(1) B408 Gr.NO8810 (1) B 409 Gr.N08810(1) B 564Gr.N08810(1)
A494 Gr. N-lPMV(1)(2) A 494 Gr. CW-IZMW (l)(2)

NOTES:
(I) Use solution annealed material only.
(2) Not to be used over 1000°F.

TABLE 2-3.15B SPECIAL CLASS

r Working Pressures by Classes, psig

Temperature,*F 150 300 400 600 900 1500 2500 4500

-2oto 100 255 670 895 1,340 2,010 3,350 5,580 10,045
200 230 605 805 1,205 1,810 3,015 5,020 9,040
300 215 565 755 1,130 1,695 2,825 4,710 8,480
400 205 535 715 1,070 1,605 2,680 4,465 8,035
500 195 510 680 1,020 1,525 2,545 4,240 7,635

600 190 490 655 980 1,470 2,450 4,085 7,355

650 180 475 630 950 1,420 2,370 3,950 7,110
700 180 470 625 940 1,405 2,345 3,905 7,030
750 175 460 615 920 '1,380 2,305 3,840 6,910
800 175 455 605 910 1,365 2,275 3,795 6,830

850 170 445 595 890 1,335 2,225 3,705 6,670

900 170 440 590 885 1,325 2,210 3,685 6,630
950 165 435 580 870 1,300 2,170 3,615 6,510
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 155 405 540 805 1,210 2,015 3,360 6,045

1150 130 345 460 685 1,030 1,715 2,860 5,145
1200 100 260 345 515 770 1,285 2,145 3,860
1250 so 230 305 455 680 1,135 1,895 3,410
1300 65 170 230 345 515 860 1,430 2,570

1350 50 130 170 260 385 645 1,070 1,930

1400 35 95 125 190 285 470 785 1,415
1450 30 75 100 145 220 365 610 1,095
1500 20 50 70 106 155 260 430 770

86
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

TABLE 2-3.16
RATINGS FOR GROUP 3.16 MATERIALS
B 511 Gr. NO8330 (l)(2) B 535 Gr. NO8330 (I) B 536 Gr. NO8330 (1)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
and grain size requirementsshall conform to the applicable ASTM specification. The manufac-
turing procedures, tolerances, tests, certification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.16A STANDARD CLASS

T Working Pressures by Classes, psig

Temperature, F
‘ 150 300 400 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 245 635 850 1,270 1,910 3,180 5,300 9,540
300 225 590 785 1,175 1,765 2,940 4,900 8,820
400 200 550 735 1,105 1,655 2,760 4,600 8,280
500 170 525 700 1,050 1,575 2,630 4,380 7,885

600 140 500 670 1,005 1,505 2,510 4,180 7,525

650 125 490 655 980 1,470 2,450 4,080 7,345
700 110 480 645 965 1,445 2,410 4,020 7,235
750 95 470 625 940 1,410 2,350 3,920 7,055
800 80 465 620 925 1,390 2,315 3,860 6,950

850 65 455 605 905 1,360 2,270 3,780 6,805

900 50 445 590 885 1,330 2,215 3,690 6,640
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 310 410 615 925 1,545 2,570 4,630

1100 20(l) 240 320 480 720 1,205 2,005 3,610

1150 20(l) 185 245 370 555 925 1,545 2,775
1200 20(l) 145 195 290 435 725 1,210 2,175
1250 20(l) 115 155 235 350 585 975 1,760
1300 20(l) 95 130 190 285 480 795 1,435

1350 20(l) 75 100 150 220 370 615 1,110

1400 20(l) 55 75 110 165 280 465 835
1450 20(l) 45 60 95 140 230 385 695
1500 15(l) 35 45 70 100 170 285 510

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

87
 VALVES-FLANGED,
ASME B16.34a-1998 THREADED,ANDWELDlNG END

TABLE 2-3.16 (CONT’D)

RATINGS FOR GROUP 3.16 MATERIALS
B 511 Gr.NO8330 (l)(2) B 535 Gr.NO8330 (I) B 536 Gr.NO8330 (I)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements,
andgrainsizerequirementsshallconformtotheapplicableASTMspecification.Themanufac-
turing procedures,tolerances,tests,cetiification, and markings shall be in accordance with
ASTM B 564.

TABLE 2-3.16B SPECIAL CLASS

T Working Pressures bv Classe is. psi9
Temperature,*F 150 300 400 r--- 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 270 710 945 1,420 2,130 3,550 5,915 10,645
300 250 655 875 1,315 1,970 3,280 5,470 9,845
400 235 615 820 1,230 1,850 3,080 5,135 9,240
500 225 585 780 1,175 1,760 2,935 4,890 8,800

600 215 560 745 1,120 1,680 2,800 4,665 8,395

650 210 545 730 1,095 1,640 2,730 4,555 8,195
700 205 540 720 1,075 1,615 2,690 4,485 8,075
750 200 525 700 1,050 1,575 2,625 4,375 7,875
800 200 515 690 1,035 1,550 2,585 4,310 7,755

850 195 505 675 1,015 1,520 2,530 4,220 7,595

900 190 495 660 990 1,485 2,470 4,120 7,415
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 155 400 535 805 1,205 2,010 3,350 6,025

1100 120 315 420 625 940 1,565 2,610 4,700

1150 90 240 320 480 725 1,205 2,010 3,615
1200 70 190 250 380 565 945 1,575 2,835
1250 60 155 205 305 460 765 1,270 2,290
1300 50 125 165 250 375 625 1,040 1,870

1350 35 95 130 195 290 480 805 1,445

1400 30 70 95 145 215 360 605 1,085
1450 25 60 80 120 180 300 500 905
1500 15 45 60 90 135 220 370 665

88
VALVES - FLANGED,
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TABLE 2-3.17
RATINGS FOR GROUP 3.17 MATERIALS
A 351 Gr. CN7M (1)

NOTE:
(1) Use solution annealed material only.

TABLE 2-3.17A STANDARD CLASS

Working Pressures by Classes, psig

Temperature, OF 150 300 400 600 900 1500 2500 4500

-20 to 100 230 600 800 1,200 1,800 3,000 5,000 9,000
200 200 520 690 1,035 1,555 2,590 4,320 7,775
300 180 465 620 930 1,395 2,330 3,880 6,985
400 160 420 565 845 1,265 2,110 3,520 6,335
500 150 390 520 780 1,165 1,945 3,240 5,830

600 140 360 480 720 1,080 1,800 3,000 5,400

TABLE 2-3.17B SPECIAL CLASS

Working Pressures by Classes, psig

Temperature, F
‘ 150 300 400 600 900 1500 2500 4500

-20 to 100 255 665 885 1,330 1,995 3,320 5,535 9,965
200 215 560 750 1,125 1,685 2,805 4,680 8,420
300 195 510 680 1,020 1,530 2,550 4,250 7,650
400 180 470 630 945 1,415 2,355 3,930 7,070
500 165 435 580 870 1,300 2,170 3,615 6,510

600 155 400 535 805 1,205 2,010 3,350 6,025

88.1
VALVES-FLANGED
THREADED,ANDWELDlNG END ASME 816.34-1996

TABLE 3 VALVE BODY MINIMUM WALL THICKNESS t,. in.

T Class

Inside
Diameter d, in.
[Note (111 150 309 400 600 900 1500 2500 4500

0.12 0.10 0.10 0.11 0.11 0.11 0.12 0.14 0.20

0.25 0.10 0.11 0.11 0.12 0.13 0.15 0.19 0.30
0.37 0.11 0.11 0.12 0.13 0.14 0.17 0.23 0.40
0.44 0.11 0.11 0.12 0.13 0.15 0.18 0.25 0.44
0.50 0.11 0.12 0.12 0.13 0.16 0.19 0.27 0.50

0.56 0.11 0.12 0.12 0.14 0.16 0.20 0.29 0.54

0.02 0.11 0.12 0.13 0.14 0.17 0.22 0.31 0.59
0.69 0.11 0.13 0.14 0.15 0.18 0.23 0.33 0.64
0.75 0.12 0.15 0.16 0.16 0.20 0.24 0.35 0.69
0.67 0.15 0.17 0.16 0.16 0.22 0.26 0.39 0.79

1.00 0.16 0.19 0.19 0.19 0.25 0.28 0.44 0.88

1.12 0.17 0.19 0.19 0.19 0.25 0.31 0.50 0.98
1.25 0.19 0.19 0.19 0.19 0.28 0.34 0.53 1.08
1.37 0.19 0.19 0.20 0.20 0.26 0.38 0.57 1.18
1.50 0.19 0.19 0.22 0.22 0.29 0.39 0.62 1.28

1.87 0.21 0.22 0.23 0.24 0.31 0.44 0.75 1.57

2.00 0.22 0.25 0.25 0.25 0.31 0.46 0.79 1.67
2.25 0.22 0.25 0.26 0.26 0.34 0.50 0.88 1.87
2.50 0.22 0.25 0.26 0.28 0.36 0.56 0.95 2.06
2.75 0.22 0.27 0.29 0.29 0.39 0.62 1.04 2.26

2.87 0.22 0.27 0.30 0.30 0.41 0.63 1.09 2.36

3.00 0.22 0.28 0.31 0.31 0.42 0.66 1.14 2.45
3.50 0.25 0.29 0.34 0.34 0.47 0.75 1.29 2.85
3.62 0.25 0.29 0.35 0.36 0.46 0.75 1.34 2.95
3.87 0.25 0.30 0.36 0.37 0.50 0.61 1.42 3.14

4.00 0.25 0.31 0.36 0.38 0.51 0.83 1.47 3.24

4.37 0.25 0.32 0.39 0.41 0.56 0.91 1.59 3.53
4.75 0.26 0.34 0.42 0.43 0.59 0.98 1.72 3.83
5.00 0.28 0.34 0.44 0.44 0.63 1.02 1.81 4.02
5.37 0.28 0.36 0.44 0.46 0.66 1.09 1.93 4.31

5.75 0.28 0.37 0.44 0.49 0.72 1.16 2.06 4.61

6.00 0.26 0.38 0.44 0.50 0.74 1.21 2.15 4.81
7.00 0.30 0.41 0.50 0.57 0.83 1.41 2.51 5.59
7.25 0.30 0.42 0.51 0.59 0.88 1.44 2.59 5.79
7.50 0.30 0.43 0.53 0.61 0.68 1.48 2.66 5.99

7.87 0.31 0.44 0.55 0.62 0.92 1.55 2.78 6.28

8.00 0.31 0.44 0.56 0.63 0.93 1.59 2.63 6.38
6.62 0.32 0.46 0.60 0.68 1.00 1.69 3.03 6.67
8.75 0.32 0.47 0.61 0.69 1.01 1.72 3.08 6.97
9.00 0.33 0.47 0.63 0.70 1.03 1.78 3.17 7.16

9.37 0.33 0.48 0.65 0.74 1.06 1.63 3.29 7.45

9.50 0.33 0.48 0.65 0.74 1.09 1.85 3.34 7.58
9.75 0.34 0.49 0.67 0.75 1.12 1.90 3.42 7.75
10.00 0.34 0.50 0.69 0.77 1.13 1.94 3.51 7.95
10.37 0.35 0.51 0.70 0.80 1.18 2.00 3.64 8.24

(Table 3 continues on next page) (Note follows at end of table)

89
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4BLE 3 VALVE BODY MINIMUM WALL THICKNESS t,,,, in. (CONT’D)

;! Class

Diameter d, in.
[Note (111 150 300 400 600 900 1500 2500 4500

10.87 0.36 0.53 0.71 0.84 1.24 2.10 3.81 8.64

11.00 0.36 0.53 0.72 0.85 1.24 2.12 3.85 8.73
11.12 0.36 0.54 0.72 0.85 1.25 2.15 3.89 8.83
11.37 0.37 0.55 0.73 0.87 1.29 2.19 3.98 9.02
11.75 0.37 0.56 0.75 0.91 1.33 2.27 4.11 9.32

12.00 0.38 0.56 0.75 0.92 1.35 2.31 4.19 9.52

12.25 0.38 0.57 0.76 0.93 1.38 2.36 4.27 9.71
12.87 0.39 0.59 0.79 0.97 1.44 2.47 4.49 10.21
13.00 0.40 0.61 0.81 0.97 1.46 2.50 4.52 10.30
13.12 0.40 0.61 0.81 0.99 1.47 2.52 4.57 10.40

13.25 0.41 0.62 0.81 1.00 1.48 2.54 4.62 10.50

13.50 0.41 0.63 0.82 1.01 1.51 2.59 4.69 10.70
14.00 0.42 0.65 0.84 1.03 1.56 2.69 4.86 11.09
14.62 0.43 0.66 0.86 1.09 1.63 2.81 5.08 11.58
14.75 0.43 0.67 0.87 1.09 1.64 2.82 5.13 11.68

14.87 0.43 0.67 0.88 1.11 1.65 2.84 5.16 11.78

15.00 0.43 0.68 0.88 1.11 1.67 2.88 5.20 11.87
15.25 0.44 0.69 0.89 1.13 1.69 2.91 5.30 12.07
15.75 0.45 0.70 0.90 1.17 1.75 3.00 5.47 12.46

16.00 0.45 0.71 0.91 1.18 1.77 3.06 5.54 12.66

16.37 0.46 0.72 0.93 1.21 1.81 3.12 5.68 12.95
16.50 0.46 0.73 0.93 1.22 1.82 3.14 5.72 13.05
17.00 0.46 0.75 0.94 1.25 1.86 3.24 5.90 13.44
17.25 0.47 0.75 0.97 1.27 1.90 3.28 5.98 13.64

17.50 0.47 0.76 0.98 1.29 1.91 3.33 6.07 13.84

17.62 0.48 0.76 0.98 1.29 1.94 3.35 6.11 13.93
18.00 0.48 0.78 1.00 1.31 1.96 3.42 6.24 14.23
18.25 0.49 0.78 1.02 1.34 2.01 3.47 6.32 14.42
18.87 0.50 0.80 1.06 1.38 2.07 3.58 6.53 14.91

19.00 0.50 0.81 1.07 1.39 2.07 3.61 6.58 15.01

19.25 0.50 0.82 1.07 1.40 2.10 3.65 6.66 15.21
19.62 0.51 0.83 1.09 1.43 2.15 3.72 6.79 15.50
20.00 0.51 0.84 1.10 1.46 2.17 3.79 6.92 15.80
20.12 0.51 0.84 1.10 1.47 2.20 3.81 6.96 15.89

20.37 0.51 0.85 1.11 1.48 2.23 3.86 7.05 16.09

20.75 0.52 0.86 1.12 1.51 2.27 3.93 7.17 16.39
21.00 0.53 0.88 1.13 1.53 2.28 3.97 7.26 16.58
21.25 0.53 0.88 1.14 1.54 2.32 4.02 7.34 16.78
22.00 0.54 0.91 1.17 1.59 2.40 4.15 7.60 17.37

22.62 0.55 0.93 1.19 1.63 2.46 4.27 7.81 17.85

22.75 0.55 0.93 1.20 1.64 2.48 4.30 7.86 17.96
23.00 0.56 0.94 1.20 1.66 2.50 4.33 7.94 18.15
23.25 0.57 0.95 1.21 1.68 2.53 4.39 8.03 18.35
23.75 0.58 0.96 1.23 1.70 2.58 4.48 8.20 18.74

90
VALVES -FLANGED,
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TABLE 3 VALVE BODY MINIMUM WALL THICKNESS fm. in. (CONT’D)

T Class
Inside
Diameter d, in.
[Note (111 150 300 400 600 900 1500 2500 4500

24.00 0.58 0.97 1.24 1.72 2.61 4.53 8.28 18.94

24.25 0.58 0.98 1.26 1.74 2.64 4.57 8.37 19.13
24.62 0.59 0.99 1.27 1.77 2.67 4.64 8.49 19.43
25.00 0.59 1.00 1.28 1.79 2.71 4.71 8.62 19.97
25.25 0.60 1.01 1.29 1.81 2.74 4.76 8.71 19.92

25.50 0.61 1.02 1.30 1.82 2.76 4.80 8.79 20.11

26.00 0.61 1.04 1.32 1.85 2.82 4.90 8.96 20.51
26.25 0.62 1.05 1.33 1.88 2.84 4.94 9.05 20.70
26.37 0.62 1.05 1.34 1.89 2.86 4.96 9.09 20.80
27.00 0.62 1.07 1.36 1.93 2.92 5.08 9.30 21.29

27.25 0.62 1.08 1.37 1.95 2.95 5.13 9.39 21.49

27.37 0.63 1.08 1.37 1.96 2.96 5.15 9.43 21.59
28.00 0.64 1.10 1.39 2.00 3.03 5.26 9.65 22.08
28.25 0.65 1.11 1.40 2.01 3.05 5.31 9.73 22.27
29.00 0.66 1.14 1.43 2.07 3.13 5.45 9.99 22.86

29.25 0.66 1.14 1.44 2.08 3.16 5.49 10.07 23.06

30.00 0.67 1.17 1.47 2.13 3.23 5.63 10.33 23.65
31.00 0.69 1.20 1.51 2.20 3.34 5.82 10.67 24.43
32.00 0.71 1.23 1.54 2.27 3.44 6.00 11.01 25.22
33.00 0.72 1.27 1.58 2.34 3.55 6.19 11.35 26.00

34.00 0.74 1.30 1.62 2.40 3.65 6.37 11.69 26.79

35.00 0.75 1.33 1.65 2.47 3.76 6.55 12.03 27.57
36.00 0.77 1.37 1.69 2.54 3.86 6.74 12.37 28.36
37.00 0.79 1.40 1.73 2.61 3.97 6.92 12.71 29.14
38.00 0.80 1.43 1.79 2.68 4.07 7.11 13.05 29.93

39.00 0.82 1.47 1.83 2.74 4.18 7.29 13.40 30.71

40.00 0.84 1.50 1.88 2.81 4.28 7.48 13.74 31.50
41.00 0.85 1.53 1.92 2.88 4.38 7.66 14.08 32.28
42.00 0.87 1.56 1.96 2.95 4.49 7.85 14.42 33.07
43.00 0.88 1.60 2.01 3.01 4.59 8.03 14.76 33.85

44.00 0.90 1.63 2.05 3.08 4.70 8.21 15.10 34.63

45.00 0.92 1.66 2.10 3.15 4.80 8.40 15.44 35.42
46.00 0.93 1.70 2.14 3.22 4.91 8.58 15.78 36.20
47.00 0.95 1.73 2.19 3.29 5.01 8.77 16.12 36.99
48.00 0.97 1.76 2.23 3.35 5.12 8.95 16.46 37.77

49.00 0.98 1.80 2.27 3.42 5.22 9.14 16.80 38.56

50.00 1.00 1.83 2.32 3.49 5.32 9.32 17.15 39.34

NOTE:
(1) See para. 6.1.2.

91
 VALVES - FLANGED,
ASME B16.34+1998 THREADED, AND WELDING END

--E-
t
_f
C

-7 q
7
%
lr C \

__-A
v 53 C

(a) TABLE 4 MIMINUM WALL THICKNESS FOR SOCKET WELDING AND

THREADED ENDS

5 Wall Thickness C, in.

Pressure Rating Class Designation

150 400
Size Through Through 800
NPS 300 600 [Note (1 )I 900 1500 2500 4500

0.12 0.12 0.12 0.14 0.14 0.21 0.22

0.12 0.13 0.13 0.16 0.16 0.26 0.29
0.12 0.14 0.14 0.17 0.17 0.28 0.37
0.13 0.16 0.16 0.21 0.21 0.32 0.44
0.14 0.17 0.17 0.24 0.24 0.34 0.51

1 0.15 0.20 0.20 0.27 0.27 0.39 0.62

1’4 0.15 0.21 0.21 0.28 0.32 0.46 0.75
1% 0.16 0.22 0.23 0.31 0.35 0.51 0.84
2 0.18 0.24 0.27 0.38 0.42 0.62 1.02
2% 0.22 0.30 0.31 1 0.41 ( 0.49 1 0.73 1 1.22

NOTE:
(1) Class 800 is not a normally tabulated ASME B16.34 designation, but it is an intermediate
class that is widely used for socket welding and threaded end valves.

92
 ANNEX A
RELATIONSHIP BETWEEN NOMINAL PIPE SIZE AND INSIDE DIAMETER

(This Annex is a nonmandatory part of ASME B16.34-1996 and is provided for information purposes only.)

The relationship between wall thickness and inside design basis for the corresponding flanged end valves,
diameter shown in Table 3 is the basis for pressure subsequently extended in application to welding end
rating of valves. By interpolation, a definitive design valves, which in many cases are identical except for
basis can be determined for any pressure-diameter- the pipe ends, Table Al is based on the dimensions
material combination. given in B 16.5 dimensional tables as “Inside Diameter
Following the evolution of standard dimensions for of Fitting.” The values above nominal pipe size 24
flanges in a series of rating classes, corresponding for the lower pressure classes and above nominal pipe
standardrelationships were establishedbetween nominal size 12 for Class 2500 are obtained by linear extrapo-
pipe sizes and the inside diameter of fittings matching lation.
the rating class of the flanges. These provided a useful

TABLE Al INSIDE DIAMETER d, in.

-r Class

Nominal
Pipe Size 150 300 400 600 900 1500 2500

% 0.50 0.50 0.50 0.50 0.50 0.50 0.44

3/4 0.75 0.75 0.75 0.75 0.69 0.69 0.56
1 1.00 1.00 1.00 1.00 0.87 0.87 0.75
1'/4 1.25 1.25 1.25 1.25 1.12 1.12 1.00
1% 1.50 1.50 1.50 1.50 1.37 1.37 1.12

2 2.00 2.00 2.00 2.00 1.87 1.87 1.50

2% 2.50 2.50 2.50 2.50 2.25 2.25 1.87
3 3.00 3.00 3.00 3.00 2.87 2.75 2.25
4 4.00 4.00 4.00 4.00 3.87 3.62 2.87
5 5.00 5.00 5.00 5.00 4.75 4.37 3.62

6 6.00 6.00 6.00 6.00 5.75 5.37 4.37

8 8.00 8.00 8.00 7.87 7.50 7.00 5.75
10 10.00 10.00 10.00 9.75 9.37 8.75 7.25
12 12.00 12.00 12.00 11.75 11.12 10.37 8.62
14 13.25 13.25 13.12 12.87 12.25 11.37 9.50

16 15.25 15.25 15.00 14.75 14.00 13.00 10.87

18 17.25 17.00 17.00 16.50 15.75 14.62 12.25
20 19.25 19.00 18.87 18.25 17.50 16.37 13.50
22 21.25 21.00 20.75 20.12 19.25 18.00 14.87
24 23.25 23.00 22.62 22.00 21.00 19.62 16.25

26 25.25 25.00 24.50 23.75 22.75 21.25 17.62

28 27.25 27.00 26.37 25.50 24.50 23.00 19.00
30 29.25 29.00 28.25 27.37 26.25 24.62 20.37

93
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX B
RADIOGRAPHY PROCEDURE AND ACCEPTANCE STANDARDS

(This Annex is an integral part of ASME 616.34-1996 and is placed after the main text for convenience.)

Bl RADIOGRAPHY PROCEDURE Bl .I0 Single wall thickness shall be radiographedwher-

ever practical.
Bl.1 ASTM E 94, Recommended Practice for Radio-
graphic Testing, and ASTM E 142, Controlling Quality
Bl .I 1 The radiographic sensitivity shall be 2-4T for
of Radiographic Testing, shall be used as a guide.
thickness up to and including 0.75 in. and 2-2T for thick-
ness 1 greater than 0.75 in.
81.2 The film shall be as close as practical to the part
being radiographed.

Bl.3 Any commercially available intensifying screen, B2 ACCEPTANCE STANDARDS

except those of the fluorescent type, may be used.
B2.1 Acceptance shall be based on the following.
Bl.4 All film shall bear identification markers to prop-
erly orient the film for interpretation and to denote the B2.1.1 Wall Thickness Less Than 2 in. The fol-
actual part under examination. Film shall be marked to lowing comparative plates of ASTM E 446 define
identify the organization producing the radiograph and acceptable indications as follows.
the date exposed.
Acceptable
Comparative Plate,
Bl.5 Penetrameters shall be used on each radiograph.
Discontinuity Type Category ASTM E 446
Penetrameters shall conform to the requirements of
ASTM E 142. Gas A A2
Sand B B3
Shrink, Type 1 C CA2
Bl.6 Any commercially available film may be used, pro- Shrink, Type 2 C CB3
vided it is equal to or finer grained than Type 2, ASTM Shrink, Type 3 C cc3
E 94. Shrink, Type 4 C CD3
Hot tears and cracks D&E None
Inserts (chills, chaplets) F None
B1.7 The manufacturer, at his option, may use a double
film technique and a combination of a single and double
viewing so as to cover a greater latitude in part thickness B2.1.2 Wall Thickness 2 in. to 4.5 in. The
with a single exposure. following comparative plates of ASTM E 186 define
acceptable indications as follows.
B1.8 Radiographs shall be within the following photo-
Acceptable
graphic (H & D) density range:
Comparative Plate,
(a) single film viewing - 1.5 minimum, 4.0 Discontinuity Type Category ASTM E 186
maximum;
Gas porosity A A3
(b) superimposedviewing of double film, each single
Sand and slag inclusions B B3
film - 1.00 minimum, 2.5 maximum, with a double C CA3
Shrink, Type 1
film - 4.0 maximum. Shrink, Type 2 C CB3
Shrink, Type 3 C cc3
Bl.9 Surfaces shall be such that radiographic contrast Crack D None
Hot tear E None
due to surface condition cannot mask or be confused with
Insert F None
that of any defect.

95
 VALVES - FLANGED,
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B2.1.3 Wall Thickness 4.5 in. to 12 in. The

following comparativeplates of ASTM E 280 define
acceptableindicationsas follows.
Acceptable
Comparative Plate,
Discontinuity Type Category ASTM E 280

Gas porosity A A3
Sand and slag inclusions B B3
Shrink, Type 1 C CA3
Shrink, Type 2 C CB3
Shrink, Type 3 C cc3
Crack D None
Hot tear E None
Insert F None

96
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX C
MAGNETIC PARTICLE EXAMINATION PROCEDURE AND ACCEPTANCE STANDARDS

(This Annex is an integral part of ASME 616.34-1996 and is placed after the main text for convenience.)

Cl PROCEDURE Four or more roundedindicationsin a line separated

by 0.06 in. or less edge to edge are unacceptable.
Magneticparticleexaminationprocedurefor castings
Roundedindicationsare those which are not defined
shall be in accordancewith ASTM E 709, Standard as linear indications.
Recommended Practicefor MagneticParticleExamina-
tion. For forgingsand bars,the examinationprocedures C2.2 Forgings and Rolled or Wrought
shall be in accordancewith ASTM A 275, Magnetic Material
Particle Examinationof Steel Forgings.
Maximum acceptableindicationsare as follows:
(a) Linear Indications:
C2 ACCEPTANCE STANDARDS (I) 0.2 in long for materials up to 0.5 in. or
less thick;
C2.1 Castings (2) 0.4 in long for materialsover 0.5 in. to 1
in. thick;
Maximum acceptableindicationsare as follows: (3) 0.6 in. long for materialsover 1 in. thick.
(a) Linear Indications: For linear indications,the indicationsmust be sepa-
(I) 0.3 in. long for materialsup to 0.5 in. thick; rated by a distance greater than the length of an
(2) 0.5 in. long for materials0.5 in. to 1 in. thick; acceptableindication.A linear indicationis one with
(3) 0.7 in. long for materialsover 1 in. thick length in excessof 3 times the width.
For linear indications,the indicationsmustbe sepa- (b) Rounded Indications
rated by a distance greater than the length of an (1) 0.2 in. diameterfor materialsup to 0.5 in. thick;
acceptableindication.A linear indicationis one with (2) 0.3 in. diameterfor materialsover 0.5 in. thick.
length in excessof 3 times the width. Four or more roundedindicationsin a line separated
(b) rounded Indications: by a 0.06 in. or less edge to edge are unacceptable.
(1) 0.3 in. diameterfor materialsup to 0.5 in. thick; Roundedindicationsare those which are not defined
(2) 0.5 in. diameterfor materialsover 0.5 in. thick as linear indications.

97
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX D
LIQUID PENETRANT EXAMINATION PROCEDURE AND ACCEPTANCE STANDARDS

(This Annex is an integral part of ASME 816.34-1996 and is placed after the main text for convenience.)

Dl PROCEDURE Roundedindicationsare those which are not defined

as linear indications.
Liquid penetrantprocedureshall be in accordance
with ASTM E 165.
D2.2 Forgings and Rolled or Wrought
Material
D2 ACCEPTANCE STANDARDS
Maximum acceptableindicationsare as follows:
(a) Linear Indications:
02.1 Castings
(1) 0.2 in. long for materials0.5 in. or lessthick;
Maximum acceptableindicationsare as follows: (2) 0.4 in. long for materialsover 0.5 in. to 1
(a) Linear Indications: in. thick;
(1) 0.3 in. Long for materialsup to 0.5 in. thick; (3) 0.6 in. long for materialsover 1 in. thick.
(2) 0.5 in. Long for materials0.5 in. to 1 in. thick; For linear indications,the indicationsmust be sepa-
(3) 0.7 in. Long for materialsover 1 in. thick. rated by a distance greater than the length of an
For linear indications,the indicationsmust be sepa- acceptableindication.A linear indicationis one with
rated by a distance greater than the length of an length in excessof 3 times the width.
acceptableindication.A linear indicationis one with (b) Rounded Indications:
length in excessof 3 times the width. (I) 0.2 in. diameterfor materialsup to 0.5 in. thick;
(b) Rounded Indications: (2) 0.3 in. diameterfor materialsover 0.5 in. thick.
(1) 0.3 in. diameterfor materialsup to 0.5 in. thick; Four or more roundedindicationsin a line separated
(2) 0.5 in. diameterfor materialsover 0.5 in. thick. by 0.06 in. or less edge to edge are unacceptable.
Four or more roundedindicationsin a line separated Roundedindicationsare those which are not defined
by 0.06 in. or less edge to edge are unacceptable. as linear indications.

99
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX E
ULTRASONIC EXAMINATION PROCEDURE
AND ACCEPTANCE STANDARDS

(This Annex is an integral part of ASME B16.34-1996 and is placed after

the main text for convenience.)

El PROCEDURE

Ultrasonicexaminationprocedureshall meet the re-

quirementsof ASTM A 388 for forgings,bars, plates,
and tubular productsand ASTM A 609 for castings.

E2 ACCEPTANCE STANDARDS

E2.1 Straight Beam Examination

Indicationswhichare equalto or exceedthatobtained

from a 0.25 in. diameter flat bottomed hole in a
calibrationtest piece of thicknessequal to the defect
depth are unacceptable.

E2.2 Angle Beam Examination

Indicationswhich are equal to or exceedthose ob-

tained from a 60 deg. V-notch 1 in. long and having
a depth not greater than 5% of the nominal wall
thicknessin a test piece are unacceptable.

101
- *
.
VALVES - FLANGED,
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ANNEX F
METHODS FOR ESTABLISHING PRESSURE-TEMPERATURE RATINGS

(This Annex is an integral part of ASME 816.34-1996 and is placed after the main text for convenience.)

Fl GENERAL CONSIDERATIONS The equation does not apply for values of P, greater
than 4,500.
Fl .l Introduction
F1.4 Additional Considerations
Pressure-temperature ratings for this Standard have
been determined by the procedures described in this The equation in para. F1.3 results in a wall thickness
Annex. The method is general and considers dimensions of 50% greater for Class 150 to 2500 and approximately
of this and related standards. Valve performance is 35% greater for Class 4500 than for a simple cylinder
related to stressand deformation. Valves require special designed for a stressof 7000 psi subjected to an internal
consideration since they are mechanically operated de- pressure equal to the pressure rating class designation.
vices that must be able to provide partial or complete The actual values in Table 3 are approximately 0.1 in.
restriction to fluid flow under a wide variety of condi- heavier than those given by the equation. Additional
tions. metal thickness, particularly for ratings over Class
2500, needed for assembly stress,valve closing stresses,
F1.2 Materials shapes other than circular, and stress concentrations
must be determined by individual manufacturers, since
It is not required that identical materials be used for these factors vary widely.
a valve body and bonnet or a valve body and cover.
The assigned pressure rating shall be based on the F1.5 Material Properties
valve body. The bonnet or cover shall be designed and
the material selected accordingly. Selection of stems, The pressure-temperature rating method uses allow-
discs, and other parts, such as bonnet gaskets and able stressesand yield strengths from reference ASME
bolting, subject to pressure.and other loading, shall be Boiler and PressureVessel Code Sections. For materials
consistent with the pressure-temperature rating. listed herein which have temperature tabulations above
those listed or are not listed at all, allowable stresses
and yield strength data have been provided directly by
F1.3 Wall Thickness
the ASME Boiler and Pressure Vessel Subcommittee
Wall thickness requirements for valve bodies are on Materials.
specified in para. 6.1. The minimum wall thickness
values shown in Table 3 are all greater than those F1.6 Material Groups
determined by the following equation.
Materials are grouped in Table 1 based on identical
or closely matched allowable stress and yield strength
PA values. When these values are not identical for each
t= 1.5
[ 2s - 1.2P, I material listed, the lowest value has been used.

where
F2 STANDARD CLASS RATING METHOD
t = calculated thickness, in.
PC = pressure rating class designation or number,
F2.1 Method for Group 1 Materials (a)
psi (e.g., for Class 150, PC = 150 psi; for
Class 300, P, = 300 psi) Pressure-temperature ratings for Standard Class
d = inside diameter or port opening as defined in valves, Class 300 and higher, of materials corresponding
para. 6.1.2, in. (see Table 3 and Annex A) to those in Materials Group 1 of Table 1, are established
S= stress factor of 7,000 psi by the equation

103
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

SI (fl Yield strength shall be as listed in ASME Boiler

-
Psr = 8750
pr2 Pm and Pressure Vessel Code, Section II, Part D, for either
Section III or Section VIII, Division 2.
where (g) Allowable stressvalues as listed in ASME Boiler
Pst = rated working pressure, psi for the specified and Pressure Vessel Code, Section II, Part D, for
material at temperature T Section III, Class 2 or Class 3 values only, may be
Pcu = ceiling pressure, psi, at temperature T as used for a material not listed for either Section I or
specified in Section F4 for Standard Class Section VIII, Division 1.
P, = pressure rating class index, psi. For all desig-
nations Class 300 and above. P, equal to the F2.2 Method for Groups 2 and 3 Materials
class designation (e.g., for Class 300, P =
Pressure-temperature ratings for Standard Class
300 psi; for Class 150, see para. F2.3 of
valves, Class 300 and higher, of materials corresponding
this Annex)
to those in Materials Groups 2 and 3 of Table 1 are
s, = selected stress, psi, for the specified material
established by the method of para F2.1, except that in
at temperature T. The value of S, shall be
paras. F2.l(a) and F2.l(a)(l), 60% shall be changed
established as follows.
to 70%.

(a) At temperatures below the creep range, S1 shall F2.3 Method for Class 150 - All Materials
be equal to or less than 60% of the yield strength at
temperature T, but shall not exceed: Pressure-temperature ratings for Standard Class
(I) 60.0% of the specified minimum yield strength valves. Class 150 rating designation, are established
at 100°F: by the method given for the related materials in paras.
(2) 1.25 times the allowable stressvalue at temper- F2.1 and F2.2, subject to the following additional
ature T, as listed in ASME Boiler and Pressure Vessel requirements:
Code, Section II, Part D, for either Section I or Section P, = 115 psi. For a rating designation less than
VIII, Division 1; Class 300, an interpolation must be made
(b) At temperatures in the creep range, the value of using P, = 115 psi for Class 150.
S, shall be the allowable stress at temperature T, as s* = selected stress, psi, for the specific material
listed in ASME Boiler and Pressure Vessel Code, at temperature T in accordance with the re-
Section II, Part D, for either Section I or Section VIII, quirements stated in either para. F2.1 or F2.2
Division 1, but not exceeding 60% of the yield strength Pst = rated working pressure, psi, for temperatures
at temperature. 100°F and lower, shall not exceed values at
(c) In no case shall the selected stressvalue increase temperature T expressedin degrees Fahrenheit,
with increasing temperature. as given by the equation.
(a) (d) The creep range is considered to be at tempera-
tures in excess of 700°F for Group 1 materials and ps,= 320 - 0.37.
950°F for Group 2 materials, unless material properties
indicate lower temperatures to be used. For Group 3 For values of temperature less than lOO”F, use T
materials, the creep range temperature limits shall be equal to 100°F.
determined on an individual material basis.
(e) When the allowable stresseslisted for the refer-
F3 SPECIAL CLASS RATING METHOD
enced ASME Boiler and Pressure Vessel Code Section
show a higher and lower value for allowable stress
F3.1
and the higher value is noted to the effect that these
stress values exceed two-thirds of the yield strength at Pressure-temperature ratings for Special Class valves
temperature, then the lower value shall be used. If (see 2.1.2) are established for all materials of Table 1
lower allowable stress values do not appear and it is by the equation
noted in the allowable stress table that the allowable
stress values exceed two-thirds of the yield strength at
temperature, then the allowable stress values shall be where
determined as two-thirds of the tabulated yield strength PSP
= Special Class rated working pressure for the
at temperature. specified material at temperature T, psi

104
VALVES - FLANGED,
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Pcb = ceiling pressure, psi, at temperature T as 3 materials, the creep range temperature limits shall
specified in para. F4 for Special Class be determined on an individual material basis.
P, = pressure rating class index, psi. For all desig- (e) When the allowable stresseslisted for the refer-
nations Class 300 and above P,, is equal to enced ASME Boiler and Pressure Vessel Code Section
the class designation (e.g, for Class 300, P, = show a higher and lower value for allowable stress
300 psi). For Class 150, P, = 115 psi. For and the higher value is noted to the effect that these
a rating designation less than Class 300, an stress values exceed two-thirds of the yield strength at
interpolation is required using P, = 115 psi temperature, then the lower value shall be used. If
for Class 150 lower allowable stress values do not appear and it is
s, = selected stress for the specified material at noted in the allowable stress table that the allowable
stress values exceed two-thirds of the yield strength at
temperature T, psi. The value of S2 shall be
temperature, then the allowable stress values shall be
established as follows.
determined as two-thirds of the tabulated yield strength
at temperature.
(4 At temperatures below the creep range, S2 shall (f) Yield strength shall be as listed in ASME Boiler
be equal to or less than 62.5% of the yield strength and Pressure Vessel Code, Section II, Part D, for either
at temperature T, but shall not exceed:
Section III or Section VIII, Division 2.
(I) 62.5% of the specified minimum yield strength (g) Allowable stressvalues as listed in ASME Boiler
at 100°F; and Pressure Vessel Code, Section II, Part D, for
(2) 1.O times the allowable stressvalue at tempera- Section III, Class 2 or Class 3 values only, may be
ture T, as listed in ASME Boiler and Pressure Vessel used for a material not listed for either Section I or
Code, Section II, Part D, for either Section I or Section Section VIII, Division 1.
VIII, Division 1.
(b) At temperatures in the creep range, the value of
S, shall be the allowable stress at temperature T, as F4 MAXIMUM RATINGS
listed in ASME Boiler and Pressure Vessel Code, The rules for establishing Standard Class and Special
Section II, Part D, for either Section I or Section VIII, Class pressure-temperatureratings include consideration
Division 1, but shall not exceed 62.5% of the yield of a ceiling pressure that effectively sets limits on the
strength at temperature T. selected stress.The ceiling pressure-temperature values
(c) In no case shall the selected stressvalue increase set an upper bound for high strength materials and are
with increasing temperature. imposed to limit deflection. By definition, ceiling values
(d) The creep range is to be considered that at apply to all intermediate ratings (para. 2.1.4). Ceiling
temperatures in excess of 700°F for Group 1 materials values are listed in Tables F4-A and F4-B. Except for
and 950°F for Group 2 materials, unless material proper- Limited Class, ratings in excess of these are not permit-
ties indicate lower temperatures to be used. For Group ted under this Standard.

105
 VALVES-FLANGED,
ASME B16.34a-1998 THREADED,ANDWELDlNGEND

TABLE F4
PRESSURE RATING CEILING VALUES

TABLE F4-A STANDARD CLASS VALVES

Working Pressures by Classes,psig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 20(l) 325 430 645 965 1,610 2,685 4,835

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 205 275 410 620 1,030 1,715 3,085
1250 20(l) 180 245 365 545 910 1,515 2,725
1300 20(l) 140 185 275 410 685 1,145 2,060

1350 20(l) 105 140 205 310 515 860 1,545

1400 20(l) 75 100 150 225 380 630 1,130
1450 20(l) 60 80 115 175 290 485 875
1500 15(l) 40 55 85 125 205 345 620

NOTE:
(I) For welding end valves only. Flanged end ratings terminate at 1000°F.

106
VALVES - FLANGED
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TABLE F4-B SPECIAL CLASS VALVES

r Working Pressures by Classes, .psig-

Temperature, "F 150 300 400 600 900 1500 2500 4566

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 8,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,!50 8,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,665 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 980 1,440 2,160 3,600 6,000 10,800

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 160 470 630 945 1,415 2,360 3,930 7,070
1000 180 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 155 405 540 805 1,210 2,015 3,360 6,045

1150 130 345 460 685 1,030 1,715 2,860 5,145
1200 100 260 346 515 770 1,285 2,145 3,860
1250 90 230 305 455 680 1,135 1,895 3,410
1300 65 170 230 345 515 860 1,430 2,570

1350 50 130 170 260 385 645 1,070 1,930

1400 35 95 125 190 285 470 785 1,415
1450 30 75 100 145 220 365 610 1,095
1500 20 50 70 105 155 260 430 770

107
 VALVES - FLANGED,
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ANNEX G
REQUIREMENTS FOR LIMITED CLASS VALVES

(This Annex is an integral part of ASME B16.34-1996 and is placed after the main text for convenience.)

G1.l General an interpolation is required using P, = 115

psi for Class 150. The equation is not valid
This Annex covers alternative requirements for valves
for Pr greater than 4500 psi.
having either threaded or welding ends and is specifi-
cally restricted to sizes NPS 2’/* and smaller. Small Psp = Special Class rated working pressure for the
specified material at temperature T as deter-
valves complying with these requirements may be desig-
mined by the method of Section F3, psi.
nated as Limited Class. There is no provision for this
These Special Class working pressures are
designation for flanged end valves.
tabulated in Tables 2 having an identifying
suffix “B.” The tabulated values shall be
G1.2 Applicability
used for establishing Limited Class ratings.
The paragraphs of this Annex are numbered corres- Y= a coefficient having values as follows:
ponding with those of the body of the Standard. All
Temperature, “F
requirements for Standard Class valves are applicable
to Limited Class except as otherwise modified by this 900 1150
Annex. Small valves are defined as sized NPS 2’/2 and and and
Below 950 1000 1050 1100 Above
smaller.

Ferritic Steels 0.4 0.5 0.7 0.7 0.7 0.7

G2.1 General Austenitic Steels 0.4 0.4 0.4 0.4 0.5 0.7
Other Ductile
Small valves conforming to the requirements of this
Materials 0.4 0.4 0.4 0.4 0.4 0.4
Annex and identified as Limited Class shall be suitable
for pressure-temperature ratings determined in accord-
In no case shall the working pressure increase with
ance with para. G2.1.3. Threaded end valves rated
increasing temperature. This shall be verified by the
above Class 2500 and socket-weld-end valves rated
manufacturer for all rating points greater than 900°F
above Class 4500 are not within the scope of this
for ferritic steels and 1050°F for austenitic steels.
Standard.

(4 G2.1.3 Limited Class Rating Method. Pressure- G2.1.5 Fabrication by Welding. Fabricated
temperature ratings for Limited Class valves are estab- valves that are identified as Limited Class shall conform
lished for Group 1 and Group 2 materials of Table 1 with the requirements of para. 2.1.5(c)(2) for Special
by the equation Class.

7000 64.1.3 Rating. Small valves shall be marked on

p’d = 7000 - 0, - 0.4) P, psp the valve body with the number for the appropriate
pressure rating class designation except that Limited
where Class and Intermediate Rating Limited Class may in-
pld = Limited Class rated working pressure for the stead be marked on the valve body with a specific
specified material at temperature T, psi rated pressure and temperature. For all small valves in
P, = pressure rating class index, psi. For all desig- Limited Class, the identification plate shall show the
nations Class 300 through 4500, P, is equal applicable pressure rating at 100°F and other markings
to the class designation (e.g., for Class 300, required by MSS SP-25. Valves conforming to Limited
P, = 300 psi). For Class 150, P, = 115 psi. Class requirements shall include the designation
For a rating designation less than Class 300, “B16.34LTD” on the identification plate.

109
 VALVES - FLANGED,
ASME B16.34a-1998 THREADED, AND WELDING END

FIG. Gl LIMITED CLASS STRESS AREA LIMITS

G6.1 Body Dimensions 66.1.5 Contours for Body Run Transitions.

The requirements of para. 6.1.5 are not applicable to
Limited Class is restricted in application to valve
Limited Class.
body geometries that have internal wetted pressure
boundary surfaces that are generally characterized by
66.1.8 Additional Metal Thickness. For Limited (a)
cylindrical passages,cylindrical or spherical chambers,
Class, it is required that metal thickness reinforcement
and intersections thereof.
be provided to satisfy the following:
G6.1.1 Wall Thickness. For inspection purposes,
the minimum thickness of the wall surrounding the
body run flow passage shall be as shown in Table 3.

G6.1.2 Inside Diameter. For the purpose of de-

termining flow passageway wall thickness, the inside where
diameter d (see Fig. Gl), is the diameter of the cylindri- s, = allowable stress of the body material at 100°F
cal flow passage. from the ASME Boiler and Pressure Vessel
Code, Section II, Part D, for either Section I
G6.1.3 Valve Body Necks. The minimum thick-
or Section VIII, Div. 1;
ness of the wall for the body neck shall be that shown
PO = rated working pressure at 100°F
in Table 3 with d for this determination taken as two-
Af = fluid area (see Fig. Gl)
thirds of d’ where d is the inside diameter of the body
A,,, = metal area (see Fig. Gl)
neck. In no case shall the body neck thickness be less
than the minimum value determined for the flow passage The fluid area and metal area are determined from
in para. G6.1.1. For values of body neck inside diameter a drawing of the valve body crotch region in the mutual
not shown in Table 3, interpolation is permitted. plane of the bonnet and flow passage center lines (see
Fig. Gl).’ The fluid and metal areas are to be based
’ For guidance in regard to other valve configurations, see ASME on the most adverse combination of dimensions permit-
Boiler and PressureVessel Code, SectionIII, NB-3545. ted by tolerances. In Fig. Gl, the distances LN and

110
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

LA which define fluid and metal area boundaries are

determined as

LN = 0.5r + 0.354 4Tb (d + Tb)

and LA as the larger of

LA = 0.5d - Tb

or

LA = T,

where
d’ = body neck inside diameter at crotch region
Tb = neck wall thickness at crotch region
T,. = body run wall thickness at crotch region
r = external fillet radius at crotch

If a calculated boundary lies beyond the body run

end or neck end, the sections to be used for area
determination shall terminate at the body run end or
neck end.

111
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX H
QUALITY SYSTEM PROGRAM

(This is a nonmandatory part of ASME 816.34-1996 and is provided for information purposes only.)

The productsmanufacturedin accordancewith this turer’s quality systemprogramby an independent orga-

standardshallbe producedunderqualitysystemprogram nizationshallbe the responsibilityof the manufacturer.
followingthe principlesof an appropriatestandardfrom The detailed documentationdemonstratingprogram
the IS0 9000 series.’A determinationof the need for complianceshall be available to the purchaserat the
registrationand/orcertificationof theproductsmanufac- manufacturer’sfacility. A written summarydescription
of the program utilized by the product manufacturer
shall be availableto the purchaserupon request.The
’ Tbe series is also available from tbe AmericanNationalStandards product manufactureris defined as the entity whose
Institute (ANSI) and the American Society for Quality Control nameor trademarkappearson the productin accordance
(ASQC) as AmericanNational Standardsthat are identifiedby a
prefix “Q” replacingthe prefix “ISO”. Each standardof the series with the markingor identificationrequirementsof this
is listed underreferences. Standard.

113
VALVES - FLANGED,
THREADED, AND WELDING END ASME B16.34a-1998

ANNEX I
REFERENCE STANDARDS AND SPECIFICATIONS

(This Annex is an integral part of ASME 816.34-1996 and is placed after the main text for convenience.)

Standards and specifications referenced in this Standard are listed showing the year of
approved issue. Products covered by each ASTM specification are listed for convenience.
(See specifications for exact titles and detailed contents.)
Publications of the following organizations appear in this list.

ASME The American Society of Mechanical Engineers (a)

Three Park Avenue, New York, New York 10016-5990
ASQC American Society for Quality Control P.O. Box 3005, Mil-
waukee, Wisconsin 53201-3005
ASTM American Society for Testing and Materials
100 Barr Harbor Drive, West Conshohocken, Pennsylva-
nia 19428-2959
MSS Manufacturer’s Standardization Society for the Valves
and Fittings Industry
127 Park Street NE, Vienna, Virginia 22180
API American Petroleum Institute
1220 L Street NW, Washington, D.C. 20005
IS0 International Organization for Standardization
1, rue de Varembe, Case postale 56, CH - 1211 Geneve
20, SwitzerlandlSuisse

IS0 documents are also available from ANSI. Publications appearing below which have
been approved as American National Standards may also be obtained from:

ANSI American National Standards Institute

11 West 42nd Street, New York, New York 10036

ASME Publications

ASME Bl.l-1989 Unified Inch Screw Threads (UN and UNR Thread Form)
ANSI B1.20.1-1983 (R1992) Pipe Threads, General Purpose (Inch)
ASME B16.5-1996 Flanges and Flanged Fittings
ASME B16.10-1992 Face-to-Face and End-to-End Dimensions of Ferrous
Valves
ASME B16.11-1991 Forged Steel Fittings, Socket-Welding and Threaded
ASME B16.20-1993 Ring-Joint Gaskets and Grooves for Steel Pipe Flanges
ASME B16.21-1992 Nonmetallic Flat Gaskets for Pipe Flanges
ASME B16.25-1992 Buttwelding Ends
ANSVASME B18.2.1-1981 Square and Hex Bolts and Screws - Inch Series
(R1992)
ANSI B18.2.2-1987 (R1993) Square and Hex Nuts
ASME B31.3-1993 Chemical Plant and Petroleum Refinery Piping
ASME B36.10M-1985 (R1994) Welded and Seamless Wrought Steel Pipe

115
 VALVES - FLANGED,
ASME 616.34a-1998 THREADED,AND WELDING END

ASME Boiler and Pressure Vessel Code

Section I Power Boilers

Section III Rules for Construction of Nuclear Power Plant Compo-
nents Division 1
Section VIII Pressure Vessels - Divisions 1 and 2
Section IX Welding Brazing Qualifications

ASTM Publications
ASTM A 105-95 Carbon Steel Forgings
ASTM A 106-94a Seamless Carbon Steel Pipe
ASTM A 182-94~ Alloy Steel Forged or Rolled Parts
ASTM A 193-94~ Alloy Steel Bolting
ASTM A 194-94a Carbon and Alloy Steel Nuts
ASTM A 203-93 Nickel Alloy Steel Plates
ASTM A 207-74a Carbon-Moly Steel Plates
ASTM A 216-93 Carbon Steel Castings
ASTM A 217-93 Alloy Steel Castings
ASTM A 240-94b Stainless Steel Plate
ASTM A 275-95 Magnetic Particle Examination of Steel Forgings
ASTM A 302-93 Pressure Vessel Plates, Carbon Steel, Manganese-Molyb-
denum and Manganese-Molybdenum-Nickel
ASTM A 307-94 Carbon Steel Bolting
ASTM A 312-94b Stainless Steel Pipe, Seamless or Welded
ASTM A 320-94a Low-Temperature Alloy Bolting
ASTM A 335-94 Seamless Ferritic Alloy Steel Pipe
ASTM A 350-95 Low-Temperature Alloy Steel Forged or Rolled Parts
ASTM A 351-94 Stainless Steel Castings
ASTM A 352-93 Low-Temperature Carbon and Alloy Steel Castings
ASTM A 354-95 Q & T Alloy Bolting
ASTM A 358-94 Electric Fusion-Welded Stainless Steel Pipe
ASTM A 369-92 Ferritic Alloy Forged or Bored Pipe
ASTM A 387-84 Alloy Steel Plates
ASTM A 388-95 Ultrasonic Examination of Heavy Steel Forgings
ASTM A 430-91 Stainless Steel Forged or Bored Pipe
ASTM A 453-94 Alloy Steel Bolting
ASTM A 479-95 Alloy Steel Bars and Shapes
ASTM A 488-94 Qualification of Proceduresfor Welding Castings
ASTM A 494-94 Nickel and Nickel Alloy Castings
ASTM A 515-92 Carbon Steel Plates, High Temperature
ASTM A 516-90 Carbon Steel Plates, Low Temperature
ASTM A 537-91 Carbon-Manganese-Silicon Steel Plates
ASTM A 540-93 Alloy Steel Bolting, Special
ASTM A 609-91 Longitudinal-Beam Ultrasonic Inspection for Carbon and
Low-Alloy Steel Castings
ASTM A 617-94 Electric-Fusion Welded Steel Pipe
ASTM A 672-94 Electric-Fusion Welded Steel Pipe
ASTM A 675-90a Carbon Steel Bars
ASTM A 691-93 Carbon & Alloy Steel Pipe - Electric-Fusion Welded
ASTM A 696-90a Carbon Steel Bars

116
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ASTM A 739-90a Alloy Steel Bars

ASTM A 789-94 Seamless and Welded Ferritic/Austenitic Stainless Steel
Tubing for General Service
ASTM A 790-94 Seamless and Welded Ferritic/Austenitic Stainless Steel
Pipe
ASTM B 424-93 Nickel-Iron-Chromium-Molybdenum-Copper Alloy Plate
Sheet and Strip
ASTM B 425-93 Nickel-Iron-Chromium-Molybdenum-Copper Alloy Rod
and Bar
ASTM B 434-89 Nickel-Molybdenum-Copper Iron Plate, Sheet and Strip
ASTM B 435-94 Nickel-Chromium-Molybdenum-Iron Alloy Plate, Sheet and
strip
ASTM B 443-93 Nickel-Chromium-Molybdenum-Columbium Alloy Plate,
Sheet and Strip
ASTM B 446-93 Nickel-Chromium-Molybdenum-Columbium Alloy Rod and
Bar
ASTM B 462-91 Chromium-Nickel-Iron-Molybdenum-Copper Columbium
Forgings
ASTM B 463-93 Chromium-Nickel-Iron-Molybdenum-Copper Columbium
Plate, Sheet and Strip
ASTM B 473-91 Chromium-Nickel-Iron-Molybdenum-Copper Columbium
Bar
ASTM B 511-93 Nickel-Iron-Chromium-Silicon Alloy Bars and Shapes
ASTM B 536-94 Nickel-Iron-Chromium-Silicon Alloy Plate, Sheet and Strip
ASTM B 564-94a Nickel Alloy Forgings
ASTM B 572-94 Nickel-Chromium-Molybdenum-Iron Alloy Rod
ASTM B 573-89 Nickel-Molybdenum-Chromium-Iron Alloy Rod
ASTM B 574-94 Low-Carbon Nickel-Molybdenum-Chromium Alloy Rod
ASTM B 575-94 Low-Carbon Nickel-Molybdenum-Chromium Alloy Plate,
Sheet and Strip
ASTM B 581-93 Nickel-Chromium-Iron-Molybdenum-Copper Alloy Rod
ASTM B 582-92 Nickel-Chromium-Iron-Molybdenum-Copper Alloy Plate,
Sheet and Strip
ASTM B 599-92 Nickel-Iron-Chromium-Molybdenum-Columbium Alloy
Plate Sheet and Strip
ASTM B 620-93 Nickel-Iron-Chromium-Molybdenum-Alloy Plate, Sheet and
strip
ASTM B 621-89 Nickel-Iron-Chromium-Molybdenum-Alloy Rod
ASTM B 622-94b Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube
ASTM B 625-93a Nickel-Iron-Chromium-Molybdenum-Copper-Low-Carbon
Alloy Plate, Sheet and Strip
ASTM B 649-89 Nickel-Iron-Chromium-Molybdenum-Copper Low-Carbon
Alloy Bar and Wire
ASTM B 672-85 Nickel-Iron-Chromium-Molybdenum-Columbium Alloy Bar
and Wire
ASTM E 94-93 Radiographic Test
ASTM E 709-94 Standard Recommended Practice for Magnetic Particle Ex-
amination
ASTM E 142-92 Controlling Quality of Radiographic Testing
ASTM E 165-95 Liquid Penetrant Inspection Method
ASTM E 186 (1967-1993) Reference Radiographs for Heavy-Walled (2 to 41/2 in.)
Steel Castings

117
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

ASTM E 280-( 1968-1993) ReferenceRadiographs

for Heavy-Walled(4’/2 to 12 in.)
SteelCastings
ASTM E 446 (1972-1993) StandardReferenceRadiographs
for SteelCastingsup to 2
in. in Thickness

MSS Publications

SP 9-1992 Spot-Facingfor Bronze,Iron, and SteelFlanges

SP 25-1993 StandardMarking Systemsfor Valves, Fittings,Flanges,
and Unions
SP 45-1992 Bypassand Drain ConnectionStandard
SP 61-1992 HydrostaticTestingof SteelValves
SP 55-1985 (R1990) Quality Standardfor SteelCastings

API Publications

API-598-1990 Valve InspectionandTest

IS0 Publications

IS0 9000-1994 Quality Systems

118
 INTERPRETATIONS TO ASME B16.34
(These interpretations are not part of ASME 616.34-1996 and are included for information only. These
interpretations apply to the 1988 and earlier editions and the requirements cited may be different in this Edition.
Therefore, some replies may not be valid in regards to this Edition.)

INTRODUCTION

As a service to persons who use the B 16 standards, B16 Committee renders interpretations of the
requirements upon request. The procedure for requesting an interpretation is described in the following
paragraphs.
The interpretations include all replies which have been approved by the B16 Main Committee in
response to inquiries concerning interpretation of this Standard.
An interpretation applies either to the Edition and Addenda in effect on the date of issuance of the
interpretation or the Edition and Addenda stated in the interpretation. Subsequent revisions to this
Standard may supersede the interpretation.

PROCEDURE FOR REQUESTING INTERPRETATIONS

Upon request, the B16 Committee will render an interpretation of any requirement of this Standard.
Interpretations can only be rendered in response to a written request, which should be addressed to:

Secretary, B16 Main Committee

The American Society of Mechanical Engineers
Three Park Avenue
New York, NY 10016-5990

The request for interpretation should be clear and unambiguous. It is further recommended that the
inquirer submit his request using the following format:
(a) Subjecr. Cite the applicable paragraph number(s) and/or give a concise description of the subject.
(b) Question. Phrase the question as a request for an interpretation of a specific requirement suitable
for general understanding and use, not as a request for an approval of a proprietary design or situation.
The inquirer may also include any plans or drawings which are necessary to explain the question;
however, they should not contain proprietary names or information.
Requests which are not in this format may be rewritten in this format prior to being answered,
which may inadvertently change the original intent of the request.
ASME procedures provide for reconsideration of an interpretation when or if additional information
is available which the inquirer believes might affect the interpretation. Further, persons aggrieved by
an interpretation may appeal to the cognizant ASME committee or subcommittee. ASME does not
“approve, ” “certify,” “rate” or “endorse” any item, construction, proprietary device, or activity.

119
616.34 Interpretations No. 2 2-1, 2-2

INTERPRETATIONS NO. 2

Replies to Technical Inquiries Issued from January 1, 1990 Through December 31, 1995

Interpretation: 2-1

Subject: Table 1; Materials

Date Issued: May 17, 1990
File: B16-89-001

Question(1): Is there an error in Table 1 in that ASTM A 351-CG8M is not listed?

Reply (1): No.

Question(2): Does a valve with a valve body made of ASTM A 351-CG8M comply with the
requirementsof ASME/ANSI B16.34-1988?
Reply (2): No.

Question(3): Can new materialsbe addedto Table l?

Reply (3): Yes. This can be done at the next revision or when an Addendais prepared.In order
to facilitatethe inclusionof new materials,it is recommended that the requesterprovidethe Committee
with the data neededto establishpressure-temperature ratingsas providedin Annex F.

Interpretation: 2-2

Subject: Paragraph 8.4.2; Weld Repair

Date Issued: May 29, 1989

File: B16-89-002

Question:Does B16.34 set limits on the extent of weld repair that may be performedon castings
for StandardClass,Special Class or Limited Class valves?
Reply: No

121
2-3, 2-4, 2-5 616.34 Interpretations No. 2

Interpretation: 2-3

Subject: Paragraph8.3.2.2; SurfaceExamination

Date Issued: May 30, 1990

File: B16-89-003

Question:Under ASME/ANSI B 16.34-1988,para. 8.3.2.2, is it permissible,for SpecialClassvalves,

to perform any or all of the requiredsurfaceexaminationseither prior to or after machining?
Reply: Yes, providedthat the requiredexaminationstake place, as requiredby para. 8.2, after any
requiredheat treatment.

Interpretation: 2-4
Subject: Paragraph6.1.5, Tables 3 and G3, AnnexesA and G
Date Issued: May 21, 1990

File: B 16-89-004

Question(1): Minimum wall thicknessrequirementsare defined in ANSI B 16.34-1981, para. 6.1.5

for the zone 1.33f, from the weld end and for the zone rm from the body neck. The intervening
transitionzone is requiredto be gradual.Is it requiredthat the transitiontaper be external?
Reply (1): No, a transition,if used, may be either external or internal or a combinationof both.

Question(2): In ANSI B16.34-1981, the minimum wall thicknesstabulatedfor Class4500 and 15

in. diameteris 11.64 in. and 295.7 mm. Are thesetabular numberscorrect?
Reply (2): No. This is a misprintthat has been correctedin ASME/ANSI B16.34-1988. The correct
value is 11.87 in. Metric dimensionsare no longer used in B 16.34.

Question(3): In ANSI B16.34-1981, is it a requirementthat valve seat diametersbe equal to (or

greaterthan) the inside diametersof Annex A?
Reply (3): No. There are, however, user specificationsthat require “full port” valves and reference
Annex A as the definition for full port.

Interpretation: 2-5
Subject: Paragraph8.3.2.1; Ultrasonicor RadiographicExamination
Date Issued: May 29, 1989 s
File: B 16-89-005

Question:Is it intendedthat the distanceof coveragefor the SpecialClassExaminationfor forgings

under para. 8.3.2.1 be the sameas for castings?

Reply: No. It is a requirementof paras.8.3.2.1(a) and (b) that the entire cylindricaland ring sections
be examined.

122
816.34 Interpretations No. 2 2-8, 2-7, 2,8

Interpretation: 2-6

Subject: Paragraph2.3.3; Fluid Thermal Expansion

Date Issued: October 5, 1989
File: B 16-89-009

Question:If a pressurerelief valve is usedas the meansof overpressureprotectionunderpara. 2.3.3

of ASME/ANSI B16.34-1988.is it requiredthatthe relief valve be manufactured
andtestedin accordance
with one of the Sectionsof the ASME Boiler and PressureVessel Code, by a manufacturerholding
the applicableCode Certificates?
Reply: This would dependupon the requirementsof the purchaserof the B16.34 valve. Paragraph
2.3.3 assignsresponsibilityfor providingmeansto assurethat the pressurein the valve will not exceed
that allowed to the purchaser.If the purchaserchoosesa pressurerelief valve as the meansthen it
is also the purchaser’sresponsibilityto designatewhich codes or regulation,if any, apply to the
installedvalve and concomitantlyto the pressurerelief valve, see para. 1.2.2.

Interpretation: 2-7
Subject: Paragraph2.1.3; Limited Class Valves
Date Issued: April 9, 1990
File: B16-89-011

Question(1): Does the expression“welding end” in ASME/ANSI B16.34-1988, para. 1.1 apply to
both socketwelding and butt welding end valves?
Reply (1): Yes.

Question(2): May butt weldingend valves,size NPS 2-1/2and smallerbe constructedin accordance
with Annex G of ASME/ANSI B16.34-1988?
Reply (2): Yes.

Interpretation: 2-8
Subject: Seal Welding
Date Issued: April 9, 1990
File: B16-90-001

Question:Does ASME/ANSI B16.34-1988 include fabricationrequirementsfor seal welding of seat

rings into valve bodies?
Reply: No.

123
2-9, 2-10, 2-11 816.34 Interpretations
No. 2

Interpretation: 2-9

Subject: Paragraph6.1.3; Valve Body Necks

Date Issued: May 4, 1990
File: B 16-90-07

Question:Does para. 6.1.3 of ASME/ANSI B16.34-1988 prohibit a gate valve design using a
rectangularbody neck?
Reply: No, however, para. 6.1.7 requiresthat the manufacturerdetermine if additionalmetal is
neededfor shapesother than circular.

Interpretation: 2-10
Subject: Paragraph6.1.2; Inside Diameter
Date Issued: June 11, 1990
File: B16-90-015

Question:With referenceto ANSI B 16.34-1981, para. 6.1.2, for butt welding end valves, may the
“basic inside diameterat the valve end” be taken as the insidediameterof the highestpipe Schedule
Number applicableto the valve size and pressureclass?
Reply: No. The basicinsidediameteris a valve specificdimensionthat may or may not be relevant
to a particularset of pipe dimensions.

Interpretation: 2-11
Subject: Paragraph2.1.5 (c); Valves Fabricatedby Welding
Date Issued: October 31, 1990
File: B 16-90-020

Question:Does ASME/ANSI B 16.34-1988 require nondestructiveexaminationfor StandardClass

Valves, NPS 6 and smaller,that are fabricatedby welding?
Reply: No.

124
816.34 interpretations
No. 2 2.12, 2-13

Interpretation: 2-12

Subject: Paragraph8.4; Defect Removal and Repair

Date Issued: January21, 1991
File: B 16-90-030

Question(1): In ASME/ANSI B16.34-1988, is Clause 8.4, covering defect removal and repair, a
requirementonly for Special Class valves?
Reply (1): Yes.

Question(2): Where are the requirementsfor defect removal, repair, and post weld heat treatment
for other than Special Class valves?
Reply (2): The requirementsare those stipulatedin the respectiveASTM specificationsas covered
in Table 1.

Question(3): When a valve is used in conjunctionwith an ASME Code for PressurePiping and
is designatedas a SpecialClassvalve and is so markedon the valve identificationplate, is it required
that the post weld heat treatmentprovisionsof para. 8.4.2(c) be met?
Reply (3): Yes. For limitationsimposedby codesand regulations,see para. 1.2.2.

Interpretation: 2-13
Subject: Annex F; Special Class Rating Method
Date Issued: January21, 1991
File: B 16-90-034

Question:Does Annex F, Special Class Rating Method, ANSI B16.34-1981, include requirements
for determininghydrostaticshell test pressure?
Reply: No. The purposeof Annex F, see F1.l, is to record the rules that were used to determine
the tabulatedpressure-temperatureratings.The only pressure-temperatureratingsrecognizedfor Special
Class valves are those in Table 2. The requiredhydrostaticshell test pressure,for all valves, is as
describedin para. 7.1.

125
2-14, 2-15, 2-16 816.34 Interpretations No. 2

Interpretation: 2-14

Subject: Requirements for Special Class Valves

Date Issued: January 21, 1991

File: B 16-90-038

Question (1): For a Special Class valve in accordance with ASME/ANSI B16.34-1988, is it permissible
to construct a composite area for radiographic coverage, based on Fig. 6 through 15, that meets the
intent of para. 8.3.1.1 for a valve body shape not illustrated?

Reply (1): Yes.

Question (2): Do any of the Figs. 6 through 15 illustrate the seat-body shell radiographic coverage
that would be required for a valve body in the form of two intersecting mutually perpendicular cylinders,
where one of the cylinders corresponds to the valve nozzles and the other to an upper and lower
bonnet cavity?

Reply (2): Yes, Fig. 13, Sections X-X and Y-Y.

Interpretation: 2-15

Subject: 6.1.1; Minimum Wall Requirements

Date Issued: March 19, 1991

File: B16-90-041

Question: Under ASME/ANSI B16.34-1988, for a valve body of sectional construction (see para.
6.4.2) where the body joint includes an internal gasket whose placement isolates an internal end section
of the body wall from the contained fluid, is it necessary that the entire body meet the minimum wall
requirements of para. 6.1.1?

Reply: Yes, taking due account that it is an obligation on the part of the manufacturer to identify
the wetted surfaces that apply under para. 6.1.1 and to ensure that the applicable metal thickness
requirements of para. 6.1.7 and the bolting requirements of para. 6.4.3 are accommodated.

Interpretation: 2-16

Subject: Minimum Wall Thickness

Date Issued: April 10, 1991

File: B16-91-003

Question: Under ASME/ANSI B16.34-1988, are the rules for minimum valve body wall thicknesses
also requirements for valve parts other than the valve body?

Reply: No.

126
616.34 Interpretations
No. 2 2-17, 2-18, 2-19, 2-20

Interpretation: 2-17

Subject: Materials
Date Issued: April 19, 1991
File: B16-91-004

Question:Is a valve that uses ASTM A269-TP304 pipe instead of ASTM A312-TP304 in the
fabricationof the valve bonnetin conformancewith ASME/ANSI B16.34-1988?
Reply: No, see paras. 1.1 and 5.1.

Interpretation: 2-18
Subject: Special ClassValves
Date Issued: August 2, 1991
File: B16-91-008

Question:In the case of a valve to be qualifiedfor a SpecialClassdesignationunder ASME/ANSI

B16.34-1988 that is not of a type specificallyillustratedin Figs. 6 through 15, e.g., a weld end ball
valve, may a composite,using for example elementsof Figs. 12 and 13, be constructedin order to
satisfy the radiographicfilm coveragerequirementsdetailed in para. 8.3.1.1?
Reply: Yes.

Interpretation: 2-19
Subject: Single Flange (Lug Type) Valve Body
Date Issued: July 31, 1991
File: B16-91-009

Question:Does ASME/ANSI B16.34-1988 prohibita singleflange (lug type) valve body madefrom
a plate material listed in Table 1 when the designis such that the body is loaded in tensionfrom
pressureand piping loads?
Reply: No. However, para. 1.2.2 cautionslimitationsthat may be imposedby codesor regulations,
para. 5.2 notes that criteria for the selectionof materialsare not within the scopeof the Standard,
and para. 6.1.7 placesresponsibilityfor adequatemetal thicknessupon the valve manufacturer.

Interpretation: 2-20
Subject: 6.2.2; Valve Flange Ends
Date Issued: February 27, 1992
File: B16-91-016

Question:Is it a requirementof ASME/ANSI B16.34-1988, that valves with integral flangedends

meet the flange thicknessrequirementsof ASME/ANSI B16.34-1988 for flanged fittings?
Reply: Yes, see para. 6.2.2.

127
2-21, 2-22, 2-23 816.34 Interpretations
No. 2

Interpretation: 2-21

Subject: Materials
Date Issued: February 14, 1992
File: B 16-92-003

Question:In accordancewith ASME/ANSI B16.34-1988, is material ASTM A105 suitablefor a

valve body at a temperatureof -25 “C?
Reply: Yes.

Interpretation: 2-22
Subject: Minimum Wall Thickness
Date Issued: April 2, 1992
File: B 16-92-004

Question:In accordancewith ASME/ANSI B16.34-1988, what basicinsidediametershouldbe used

when determiningminimum requiredbody wall thicknessfor a wafer style ball valve?
Reply: The diameterassociatedwith the valve body insidecircumferenceshouldbe used.See para.
6.7(c) and Fig. 16.

Interpretation: 2-23
Subject: Flanged-EndDimensions
Date Issued: May 12, 1992
File: B 16-92-004

Question:Under ASME B16.34-1988, what dimensionsapply for flangesor flanged-endvalves that

are of a smaller size than those listed in the referenceASME B16.5?
Reply: Valves having end flangessmallerthan thoselisted in ASME B16.5 are not coveredby the
scopeof ASME B16.34-1988.

Subject:Paragraph5.1; Bolting Material

Question:For valve bolts, doesASME/ANSI B16.34-1988 have requirementsfor bolt head configu-
ration?
Reply: No, however, bolting material is required to be in accordancewith one of the bolting
specificationslisted in Table 1 under Group 4. See para. 5.1.

128
616.34 Interpretations No. 2 2-24, 2-25, 2-26

Interpretation: 2-24

Subject: Paragraph2.1.5; Valves Fabricatedby Welding

Date Issued: May 12, 1992

File: B 16-92-009

Question(1): Under ASME/ANSI B16.34-1988, is there a valve size above which both flangedend
valves and StandardClasswelding end valves that are fabricatedby welding are requiredto meet the
nondestructiveexaminationrequirementsof ASME Boiler and PressureVessel Code, Section VIII,
Division 1, for welding?
Reply (1): Yes, see para. 2.1.5(c)(l).

Question (2): For the fabrication welds identified in the first question,are these nondestructive
examinationrequirementsapplicableto all suchwelds regardlessof size?
Reply (2): Yes.

Interpretation: 2-25
Subject: Paragraph2.1.5; Valves Fabricatedby Welding
Date Issued: May 12, 1992

File: B16-92-010

Question:Are the factors 0.80 and 1.00 cited in paras.2.1S(c)(l) and 2.1.5(c)(2) castingquality
factors?
Reply: No. These factorsrepresentweld joint efficiency for which the referenceASME Boiler and
PressureVessel Code, SectionVIII, Division 1, specifies,for the type of weld joint used,the degree
of nondestructiveexaminationrequired.

Interpretation: 2-26
Subject: Paragraph5.1.2; InvestmentCastings
Date Issued: August 19, 1992

File: B16-92-013

Question(1): Does ASME/ANSI B16.34-1988placelimits on the size or pressureclassfor investment

cast bodies,bonnetsor cover plates?
Reply (1): No.

Question(2): To what extent do the limits on size and pressureclassin para. 5.1.2 apply?

Reply (2): These limits restrict the use of the cited alternativematerial specificationrequirements
when masterheatsare used for investmentcastings.

129
2-27, 2-28, 2-29 816.34 Interpretations No. 2

Interpretation: 2-27

Subject: Paragraph7.1; Shell Testing

Date Issued: August 25, 1992

File: B16-92-017

Question(1): Under ASME/ANSI B16.34-1988, when a flangedend valve body that had been shell
testedhas the end flanged gasketseatingsurfaceremachinedto provide a different surfacefinish, is
it requiredthat the valve body again be shell tested?
Reply (1): Shell testingrequirementsapply to assembledvalves.There are no provisionsfor separate
pressuretestingof valve componentparts such as valve bodies.

Question(2): Under ASME/ANSI B16.34-1988, when a flangedend valve that has been shell tested
has the body end flange gasketseatingsurfaceremachinedto provide a different surfacefinish, is it
requiredthat the valve again be shell tested?
Reply (2): No. However, it shouldbe noted that ASME/ANSI B16.34-1988 appliesto new valve
construction,para. 1.1. Therefore, the valve would not require retest if the remachiningwas done
either by or under the aegis of the valve manufacturer.

Interpretation: 2-28
Subject: Welding End Valves
Date Issued: August 19, 1992

File: B16-92-018

Question:In ASME/ANSI B16.34-1988, when referenceis made to welding end valves, e.g., para.
1.1 under Scope,does that include both socketwelding end valves and butt welding end valves?
Reply: Yes.

Interpretation: 2-29

Subject: scope
Date Issued: January6, 1993

File: B 16-92-029

Question(1): Doesthe scopeof ASME/ANSI B 16.34-1988includecoveragefor valveendconfigurations

other than those related to flanged,butt welding, socketwelding or threaded?
Reply (1): No.

Question(2): Are valves with end configurationsother than those within the scopeof B16.34-1988
permittedunder ASME pressurevesseland piping Codes?
Reply (2): Since Code requirementsmay vary regardingconformancestipulationsit is necessary
that the applicablecode be consulted.

130
816.34 Interpretations No. 2 2-30, 2-31

Interpretation: 2-30

Subject: Paragraph6.4.2; Body Joints

Date Issued: October 19, 1993
File: B 16-93-007
Question(1): With referenceto ASME/ANSI B16.34-1988, para. 6.4.2, may a valve manufacturer
use one of the bolting materialsfrom Table 1 that has an allowable stressin excessof 20,000 psi
for a valve body joint?
Reply (1): Yes.
Question(2): When a valve manufacturerselectsa bolting materialfrom ASME B16.34-1988, Table
1, for a valve body joint and that material has an allowable stressgreater than 20,000 psi, is it
permissibleto use that higher allowable stresswhen calculating the bolting area requirementin
accordancewith Clause6.4.2(a)?
Reply (2): No.

Interpretation: 2-31

Subject: Special Class Valves

Date Issued: August 11, 1993
File: B16-93-013
Question:Does ASME/ANSI B16.34-1988 include requirementsfor Special Class Valves having
other than threadedor welding ends?
Reply: No.

131
2-32, 2-33 816.34 Interpretations
No. 2

Interpretation: 2-32
Subject: Paragraph4.1.3; Rating, IdentificationPlate
Date Issued: November 8, 1993
File: B16-93-014

Question (1): In ASME/ANSI B16.34-1988, para. 4.1.3, is the reference identificationplate the
identificationplate providedby the manufacturer?
Reply (1): Yes.

Question(2): Does ASMWANSI B16.34-1988 require the applicable“B 16.34” designationto be

marked other than on the manufacturersidentificationplate?
Reply (2): No.

Question(3): Is a valve in conformancewith ASMWANSI B16.34-1988 if it does not have the

applicable“B 16.34” designationon the manufacturersidentificationplate?
Reply (3): No.

Question (4): The footnote to Clause 4.1.3 in ASME/ANSI B16.34-1988 permits, upon written
conformationfrom the manufacturer,marking socket weld or threadedend valves with “B16.34” or
“B16.34 LTD.” Does this also permit the markingof flangedend valves as “B16.34” or butt welding
end valves as “B16.34 SPL” by other than the valve manufacturer?
Reply (4): No.

Interpretation: 2-33
Subject: Table 1
Date Issued: October 4, 1993
File: B16-93-015

Question:May valves be marked as being in compliancewith ASMWANSI B 16.34-1988 when

constructedof materialsspecifiedin ASME Boiler and PressureVessel Code Casesbut which are not
includedin Table l?
Reply: No. See paras. 1.1 and 5.1 which require that materialsbe selectedfrom those listed in
Table 1.

132
616.34 Interpretations No. 2 2-34. 2-35. 2-36

Interpretation: 2-34

Subject: Paragraph8.3.1.1; RadiographicExamination

Date Issued: October4, 1993

File: B16-93-019

Question:If a valve castingis subjectto radiographyin accordancewith ASME B16.34-1988, para.

8.3.1.1, and found to have indicationsin excessof the Annex B2 acceptancecriteria, may that casting
be repairedby weldingin accordance with para.8.4 andagainbe radiographed
to determineacceptability?
Reply: Yes.

Interpretation: 2-35

Subject: Table 1, Body-Bonnetand Cover Bolting

Date Issued: February 1, 1994

File: B 16-93-024

Question(1): Accordingto ASME/ANSI B16.34-1988, if a valve designincorporatesan intervening

elementbetweenthe body and the bonnetor cover plate with saidelementforming part of the pressure
shell while being retainedby the body-bonnetor cover bolting, is said element requiredto be of a
material listed in Table 1, Group 1, 2, or 3 and be retainedby bolting of a material listed in Table
1, Group 4?
Reply (1): Yes.

Question(2): Accordingto ASMEIANSI B16.34-1988, if a valve designincorporatesan intervening

elementbetweenthe body and the bonnetor cover plate with saidelementforming part of the pressure
shell while being retainedby the body-bonnetor cover bolting, doesthe bolting have to meet all the
requirementsfor body-bonnetor cover bolting?

Reply (2): Yes.

Interpretation: 2-36
Subject: Paragraph7.1; Shell Test
Date Issued: April 5, 1994

File: B16-94-001

Question:According to ASME/ANSI B16.34-1988, are the requirementsfor valve shell pressure

testingmet when pressureretainingparts are separatelytestedin accordancewith paragraph7.1 and
later the valve assembledfrom thesepartsis testedat a test pressurelower than the shell test pressure
requiredby para. 7.1?

Reply: No.

133
2-37, 2-38 816.34 Interpretations No. 2

Interpretation: 2-37

Subject: Paragraph 8.3.1.1; Radiographic Examination

Date Issued: June 21, 1994

File: B 16-94-004

Question: In ASME/ANSI B16.34-1988, Fig. 10 illustrates casting section radiographic examination

film coverage requirements for a plate type flanged bonnet for a gate valve. For a hemispheric flanged
bonnet, not illustrated in ASME/ANSI B16.34-1988, does the section dimension “A,” when applied at
the intersection of the stuffing box neck and the hemispherical junction satisfy the requirements of
Clause 8.3.1.1(b)?

Reply: Yes.

Interpretation: 2-38

Subject: Standard Class Valve

Date Issued: August 2, 1994

File: B 16-94-005

Question (1): According to ASME/ANSI B16.34-1988, is the sold requirement for conformance as
a standard class valve the successful completion of a hydraulic test?

Reply (1): No. For conformance all of the requirements of ASME B16.34 must be met including
those applicable requirements of reference specifications.

Question (2): When forgings or castings of an ASME/ANSI B16.34-1988 valve are weld repaired
does the valve then merit a special class rating?

Reply (2): No. In order to assign a special class rating all of the requirements for special class
must be met.

134
616.34 Interpretations No. 2 2-39

Interpretation: 2-39

Subject: ParagraphF1.3; Wall Thickness

Date Issued: September14, 1994
File: B 16-94-007

Question(1): What is the purposeof American National StandardASME/ANSI B16.34-1988?

Reply (1): See the Foreword and the Scope of this Standard.

Question (2): Is the equation shown in para. F1.3 of ASME/ANSI B16.34-1988 a valve body
minimum wall thicknessrequirement?
Reply (2): No. See para. 6.1.

Question(3): Under ASME/ANSI B16.34-1988,is valve designthe responsibilityof the manufacturer

so long as the minimum wall thicknessrequirementis met?
Reply (3): No, the manufactureris responsiblefor meeting all the applicablerequirementsof the
Standard.

Question(4): In ASME/ANSI B16.34-1988, Table 3 valuesrelate to valve body requiredminimum

wall thickness.Since the equationin para. F1.3 is not a wall thicknessrequirementof the Standard,
why was it included?
Reply (4): It is included as backgroundmaterial since it provides,as explainedin para. F1.3, a
near approximationto the valuestabulatedin Table 3.

Question(5): May the designrules of the ASME Boiler and PressureVessel Code, e.g., Section
VIII-Division 1, be used as a supplementalreferencefor establishingadditionalmetal thicknessnoted
in para. 6.7 of ASME/ANSI B16.34-1988?
Reply (5): In para. 6.7, the responsibilityfor the determinationof appropriatedesignrules is placed
upon the manufacturer.

Question(6): When will ASMIYANSI B16.34-1988 be revised to provide for the use of metric
bolting?
Reply (6): Considerationis presentlybeinggiven to addingmetricboltingand other metric references
to ASME B16.34. A schedulehas not been preparedfor the issuanceof a metric standard.Until such
a revision is completedand approvedas an American National Standard,valves using metric bolting
cannotbe identified as being in conformancewith B16.34.

135
240, 2-41, 2-42 816.34 Interpretations No. 2

Interpretation: 2-40

Subject: InserviceMaterial Deterioration

Date Issued: January 16, 1995
File: B16-94-010

Question: Does ASME B16.34-1988 include requirementsfor inspectionfor inset-vicematerial

deteriorationand mandatoryvalve replacement?
Reply: No. Requirementsare limited to new valves by the scope.

Interpretation: 2-41
Subject: On-Line Valve Modifications
Date Issued: January 16, 1995
File: B 16-94-009

Question:Are on-line valve modifications,for exampledrilling and tappinginto a packingchamber

to add an auxiliary fitting, coveredby ASME B 16.34-1988?
Reply: No. See para. 1.1 where the scopeis defined as applying only to new valve construction.

Interpretation: 2-42
Subject: Paragraph6.7; Wafer or FlangelessValves
Date Issued: August 11, 1995
File: B16-95-003

Question(1): In B16.34-1988, are the requirementsof para. 6.7 applicableto all valves whosebody
categoryis wafer or flangeless?
Reply (1): Yes.

Question(2): In B16.34-1988, para. 6.7(e) requiresthat the sum of an inner and outer ligament
shall not be less than rm,the requiredminimum wall thickness.In Fig. 16, under “Relationship,”it
is also noted that the sum of the dimensions“p’ and “g” shall not be less than rm.Is the dimension
“g” correctly shownin the drawing?
Reply (2): No. There is a printing error. The dimension“g” shouldhave been shownas an outer
ligamentdimensionas describedby the text.

Question(3): In B16.34-1988, Fig. 16, may the hole illustratedwith dimension“g” be repeated
aroundthe valve body peripheryfor the purposeof defining attachmentflange bolt holes?
Reply (3): No.

Question(4): In B16.34-1988,may para.6.7 be usedto determineminimumwall thicknessrequirements

for a multipiecevalve body havingblind holesparallel to the centralbody run (e.g., holes in a wafer
type center piece) for assemblybolting?
Reply (4): Yes.

136
816.34 Interpretations
No. 2 243, 2-44

Interpretation: 2-43
Subject: SeparationRequirements
Date Issued: August 11, 1995
File: B 16-95-004

Question:In B16.34-1988, paras.C2.l(a), C2.2(a), and D2.2(a), doesthe separationrequirementfor

linear indicationsapply only to linearly aligned indications?
Reply: No. The separationrequirementappliesequally to all alignments.

Interpretation: 2-44
Subject: Paragraph6.1.2; Inside Diameter
Date Issued: December 13, 1995
File: B16-95-008

Question:For socket-welding-end valves, does ASME B16.34-1988, by referenceto ASME B16.11

in para. 6.2.3 require that the inside diameter,d, defined in para. 6.1.2, be the “bore diameter of
fitting” as in ASME B16.1l?
Reply: No.

137
B16.34 Interpretations No. 2 2-45. 2-46

INTERPRETATIONS NO. 2

Replies to Technical Inquiries Issued from January 1, 1997 Through July 1, 1998

Interpretation: 2-45

Subject: Para. 6.7

Date Issued: August 11, 1997

File: B 16-97-002

Question (1): Are multiple radial holes that penetrate the required minimum wall thickness of a valve
body, e.g., holes for the purpose of securing an identification plate, permitted under the requirements of
para. 6.7(g) of ASME B16.34-1988?

Reply (1): No. This clause only identifies requirements related to a single radial hole.

Question (2): Is it permissible to apply the requirements of para. 6.7 of ASME B16.34-1988 to butterfly-
type valves that have integral or welded flanges on one or both body ends?

Reply (2): No.

Interpretation: 2-46

Subject: Multiple Material Marking/Identification Plate

Date Issued: April 6, 1998

File: B 16-98-005

Question (1): When a valve body material meets all the requirements of two separatematerial specification
grades listed in Table 1 of ASME B16.34-1996, may the valve body be marked with both material grade
symbols in accordance with para. 4.2.8?

Reply (1): Yes.

Question (2): Is the selection of which of the two maximum or limiting temperatures to be shown on
the identification plate required by para. 4.3 of ASME B 16.34-1996 for a valve body that is marked with
two material grade symbols designating material grades that have differing cautionary or specified
temperature limits listed in the respective Table 2 Notes the option of the manufacturer?

Reply (2): Yes.

139
2-47 B16.34 Interpretations No. 2

Interpretation: 2-47

Subject: Minimum Wall Thickness

Date Issued: April 6, 1998

File: B 16-98-006

Question (1): Do the rules of para. 6.1.6 in ASME B16.34-1996 apply to local areas having less than
the required minimum wall thickness resulting from manufacturing operations such as casting, forging, and
machining, including grinding, milling, and drilling?

Reply (1): Yes.

Question (2): Under the rules of ASME B16.34-1988, is it permissible to use Table 3 to extrapolate
minimum wall thickness for valves having pressure-temperature ratings less than CIass 150?

Reply (2): No.

Question (3): Are flanged valves that conform to the flange thicknessrequirements for PN IO steel valves
within the scope of either ASME B16.34-1988 or -1996?

Reply (3): No.

140
 Replaced Pages

The following pages contain the material that was in the original edition that has been
replaced by subsequent changes made in an addenda. They are included here for
reference.
 FOREWORD

(This Foreword is not part of ASME 616.34-1996.)

In December1969, AmericanNational StandardsCommitteeB16 changedits name from

Standardizationof Pipe Flanges and Fittings to Standardizationof Valves, Fittings, and
Gaskets,reflecting American National StandardsInstitute approval of a broadenedscope
for the B16 Committee. At the same meeting, the committee approved a plan for the
organizationof a subcommitteeto developa new standardfor steel valves with other than
flangedends.Subsequently, B16 Subcommittee15 was appointedand held its first meeting
in December 1970.
Historically, in the developmentof standardsand pressure-temperature ratingsfor steel
valves, the variousrating classesfor flangesprovidedan obviouslylogical basisfor valve
ratings.Steel valves with flangesof standarddimensions,many also offered in buttwelding-
end versions,were given the samepressure-temperature ratingsas the flanges.In 1949, a
new edition of the standard,then designatedB16e 1949, was published,in which a table
covering wall thicknessrequirementsfor weld end valves had been added. In 1964, the
Manufacturer’s StandardizationSociety of the Valve and Fittings Industry developedand
publishedStandardPracticeSP 66, coveringpressure-temperature ratingsof steelbuttwelding-
end valves. SP 66 introduceda new methodfor establishingratingsby making ratingsa
function of the mechanicalstrengthpropertiesof the body material at all temperatures.
Following the publicationof SP 66, B16 activated Subcommittee4 for the purposeof
studyingthe generalsubjectof pressure-temperature ratingsand developingrationalcriteria
for suchratings.
In the B 16 chargeto Subcommittee15, it was establishedthat the new standardwould
replaceSP 66 and alsoremovethe referenceto buttwelding-end valvesfrom B16.5. Flanged-
end valves would continueto be covered in B16.5 but on a fully specifiedbasis,rather
than as an add-on.
As the work of the subcommitteegot underway, concurrentaction was initiated in
Subcommittee3 for revision of B16.5. Subsequentoperationsof Subcommittees3 and 15
were closely coordinatedto provide assurance that the new standardand the revisedB16.5
would be compatible.
A key and basicissueof mutualconcernin this coordinationwas the matterof pressure-
temperatureratings. It was necessaryto incorporatethe SP 66 type ratings in the new
standard,but at the sametime also to provideratingsequivalentto thosein B 16.5 covering
the buttweldingequivalentsof flanged-endvalves. Subcommittee4 had made definitive
recommendations for revisions in the flange ratings and it was obviously desirableto
rationalizethe two types of ratingsas they would appearside-by-sidein the new standard.
The resultsof these efforts appear herein in the form of pressure-temperature ratings
tables. The method of computingthe ratings is detailed in Annex F. The ratings differ
from the pre-1968 B16.5 ratings becausethey are now calculatedas a function of the
mechanicalpropertiesof the pressureboundarymaterials,in contrastto the empiricalbasis
used previously. A change in the SP 66 type rating (herein designatedSpecial Class)
discontinuesthe applicationof a plasticity factor at elevated temperatureswhich, in the
opinion of the committee,could not be justified in dimension-sensitive valves.

V
 Other innovationsincludethe coverageof forgedor fabricatedbody valvesand an increase
in detailed coverage by pressure-temperature ratings from 17 materialsin B16.5 to 24
material groupsin the new standardand in the revised B16.5. Dimensionalrequirements
have been refined and augmentedto give the designermore latitude and the user more
assuranceof adequacy.A numberof the innovationshave had trial use and at least some
degree of acceptance,as they have been taken from the sectionon valve requirements
developedand publishedby the ASME Boiler and PressureVessel Code to cover valves
used in nuclear power plants.A sectionon valve testingeliminatesuncertaintieson such
points as seat test requirementsand stem seal testing.
Approval for the 1973 edition of the Standardby the American National Standards
Institutewas grantedin October 1973.
In December1973, a reorganizationof the subcommittee structurefor B16 was approved.
Subcommittee15 was redesignated as SubcommitteeN and was assignedresponsibilityfor
all steel valves. Work beganto include coveragefor flanged-endvalves in ANSI B16.34.
The 1977 edition containedflanged-endvalve requirementsformerly in ANSI B16.5. The
ratingproceduresof B16.5 were adoptedand madeapplicableto StandardClassbuttwelding-
end valves. The methodof deriving ratingswas revised.Major changeswere made in the
method for determiningratings for austeniticstainlesssteel valves and ratings for Class
150 valves for all materials.The pressure-temperature tables and materialsgroups were
rearrangedand revised using data from the reference Sectionsof the ASME Boiler and
PressureVessel Code through the Summer 1975 Addenda.A number of clarifying and
editorial revisionswere also made in order to improve the text. It was also resolvedthat
frequentminor changesin pressure-temperature ratingsbecauseof revisionsto the reference
material strengthproperty tables should be avoided and that, as a general guide, such
changesshouldnot be consideredunlessresultingratingswould be changedby an amount
in excessof 10%.
Approval for the 1977 edition of the Standardby the American National Standards
Institutewas grantedon June 16, 1977.
During 1979, work beganon the 1981 edition. Materialscoveragewas expanded.Nickel
alloys and other alloys were added. Bolting rules were revised to accommodatespecial
alloy bolting for the new materials.Revisionswere includedto clarify requirementsfor
rotarymotionvalves.,e.g., ball valvesandbutterflyvalves.Wafer-typevalveswere specifically
identified.Other clarifying and editorial revisionswere made in order to improve the text.
Following approvalsby the StandardsCommitteeand Secretariat,approvalfor the 1981
edition was grantedby the American National StandardsInstituteon August 14, 1981.
During 1985, revisionswere proposedthat added requirementsfor socket welding-end
and threaded-endvalves.The inclusionof requirementsfor thesevalves increasedthe scope
of the Standard.Also, the listingsfor nickel alloy and other alloy valves materialswere
expanded.Rules for threadedbody joints were added, and wafer-type valve body rules
improved.
Following approvalsby the StandardsCommittee and ASME, approval for the 1988
edition was grantedby the American National StandardsInstituteon February 24, 1988.
During 1993 and carrying over into 1994, revisionsoffered includedmultiple material
marking and an improved interpolationprocedure.New materials were added and the
pressure-temperature rating tableswere recalculatedin accordancewith Annex F usingthe
latest data available from the referenceASME Boiler and PressureVessel Code sources.
An Annex was addedcoveringnonmandatoryrequirementsfor a quality systemprogram.
Following the approvalsthe StandardsCommittee and ASME, approval for the new
edition was grantedby the American National StandardsInstituteon October 3, 1996.
All requestsfor interpretationor suggestions for revisionsshouldbe sentto the Secretary,
B16 Committee,The AmericanSocietyof MechanicalEngineers,United EngineeringCenter,
345 East 47th Street, New York, NY 10017.

vi
 ASME 616 COMMITTEE
Standardization of Valves, Flanges, Fittings, Gaskets, and Valve
Actuators

(The following is the roster of the Committee at the time of approval of this Standard.)

OFFICERS
W. N. McLean, Chair
R. A. Schmidt, Vice Chair
K. M. Ciciora, Secretary

COMMllTEE PERSONNEL
W. L. Ballis, Columbia Gas Distribution Co., Columbus, Ohio
M. L. Blair, US Coast Guard, Washington, D.C.
R. R. Brodin, Fisher Controls International, Inc., Marshalltown, Iowa
M. A. Clark, NIBCO Inc., Elkhart, Indiana
A. Cohen, Copper Development Association, New York, New York
W. C. Farrell, Jr., Consultant, Birmingham, Alabama
C. E. Floren, Mueller Co., Decatur, Illinois
D. R. Frikken, Monsanto Co., St. Louis, Missouri
M. W. Garland, Frick Co., Waynesboro, Pennsylvania
J. 6. Hagan, ABS Americas, New Orleans, Louisiana
J. C. Inch, Mueller Brass Co., Hartsville, Tennessee
G. A. Jolly, Henry Vogt Machine Co, Louisville, Kentucky
W. G. Knecht, Anchor/Darling Valve Co., Williamsport, Pennsylvania
R. Koester, The William Powell Co., Cincinnati, Ohio
W. N. McLean, Newco Valves, Palos Park, Illinois
F. C. Rosch, Jr., Technicon Enterprises, Inc., Oley, Pennsylvania
R. A. Schmidt, Ladish Co., Russellville, Arkansas
W. M. Stephan, Flexitalic, Inc., Pennsauken, New Jersey
T. F. Shroud, Ductile Iron Pipe Research Association, Birmingham, Alabama
R. E. White, Repairs, Inc., South Bend, Indiana
D. A. Williams, Southern Company, Services, Birmingham, Alabama
L. A. Willis, Dow Chemical Co., Freeport, Texas
W. R. Worley, Union Carbide Corp., South Charleston, West Virginia

PERSONNEL OF SUBCOMMITTEE N - STEEL VALVES

W. N. McLean, Chair, Newco Valves, Palos Park, Illinois
R. A. Koester, Vice Chair, The William Powell Co., Cincinnati, Ohio
U. D’Urso, Secretary, ASME, New York, New York
E. A. Bake, Edward Valve, Inc., Raleigh, North Carolina
M. L. Blair, US Coast Guard, Washington, D.C.
D. R. Frikken, Monsanto Co., St. Louis, Missouri
R. A. Handschumacher, Handschumacher Associates, Saunderstown, Rhode Island
G. R. Icenogle, Fisher Controls International, Inc., Marshalltown, Iowa
G. A. Jolly, Henry Vogt Machine Co., Louisville, Kentucky
R. J. Kiessel, US NRC, Washington, D.C.
W. G. Knecht, Anchor/Darling Valve Co., Williamsport, Pennsylvania

vii
F. R. O’Brien, Pacific Valves, Long Beach, California
G. J. Paptzun, Yarway Corp., Blue Bell, Pennsylvania
D. W. Rahoi, CCM 2000, Rockaway, New Jersey
F. C. Rosch, Jr., Technicon Enterprises, Inc., Oley, Pennsylvania
H. R. Sonderegger, Grinnel Corp., Cranston, Rhode Island
F. C. Tsao, Department of Navy, Washington, D.C.

...
VI11
 ASME 816.34-1996

VALVES - FLANGED, THREADED, AND WELDING END

1 SCOPE edition have been met. However, where suchcompo-

nents were installed under the pressuretemperature
1 .l General ratingsof an earlier edition of ASME B16.5 or ASME
B16.34, those ratings shall apply except as may be
This Standard applies to new valve construction
governedby an applicableCode (see para. 1.2.2)
and covers pressure-temperature ratings, dimensions,
tolerances,materials, nondestructiveexaminationre- 1.2.4 User Accountability. This Standardcites
quirements,testing,and markingfor cast, forged, and duties and responsibilities
that are to be assumedby
fabricatedflanged,threaded,andweldingend andwafer the valve userin the areasof, for example,application,
or flangelessvalves of steel, nickel-basealloys, and installation,systemhydrostatictesting,operation,and
other alloys shown in Table 1. Wafer or flangeless material selection.
valves, bolted or through-bolttypes, that are installed
betweenflangesor againsta flange shall be treatedas 1.2.5 Quality Systems. Requirementsrelating to
flanged-endvalves. Alternative rules for small valves the valve manufacturesQuality SystemProgramsare
(NPS 21/2and smaller) are given in Annex G. describedin nonmandatoryAnnex H.

1.2 Applicability 1.3 Service Conditions

1.2.1 Standards and Specifications. Standards Criteria for selectionof valve types and materials
and specificationsadoptedby referencein this Standard suitablefor particularfluid service are not within the
andthe namesandaddresses of the sponsoring organiza- scopeof this Standard.
tionsare shownin AnnexI. It is not considered practical
to refer to a specificedition of each of the standards 1.4 Convention
and specificationsin the individualreferences.Instead, For the purposeof determiningconformancewith
the specificedition referencesare includedin Annex this standard,the conventionfor fixing significantdigits
I. A productmadein conformancewith a prior edition wherelimits, maximumandminimumvalues,are speci-
of referencestandards andin all otherrespectsconform- fied shall be “rounding off’ as defined in ASTM
ing to this Standardwill be consideredto be in confor- PracticeE 29. This requiresthat an observedor calcu-
mance even though the edition reference may have lated value shall be roundedoff to the nearestunit in
beenchangedin a subsequent revisionof this Standard. the last right-handdigit usedfor expressingthe limit.
Decimal valuesand tolerancedo not imply a particular
1.2.2 Codes and Regulations. A valveusedunder
methodof measurement.
the jurisdiction of the ASME Boiler and Pressure
VesselCode, the ASME Code for PressurePiping, or
governmentalregulationsis subjectto any limitation 2 PRESSURE-TEMPERATURE RATINGS
of that code or regulation.This incudesany maximum
temperaturelimitationfor a materialor rule governing 2.1 General
the use of a material at a low temperature.
Pressure-temperatureratingsare designatedby class
1.2.3 Time of Purchase, Manufacture, or In- numbers.Each class number is further identified as
stallation. The pressure-temperature ratingsincluded Standard,Special,or Limited Class.Ratingsare tabu-
in this Standardare applicable,upon its publication, lated in Tables 2 for Standardand SpecialClass 150,
to all valves coveredwithin its scopewhich otherwise 300, 400, 600, 900, 1500, 2500, and 4500. Ratings
meet its requirements.For unusedvalves, valves that for Limited Class are determinedby the method of
have been maintainedin inventory, the manufacturer Annex G.
may certify conformanceto this edition providedthat (a) Flangedend-valvesshall be rated only as Stan-
it can be demonstratedthat all requirementsof this dard Class.
 VALVES - FLANGED,
ASME 616.34-1996 THREADED, AND WELDING END

(b) Class 4500 appliesonly to welding end-valves. Limited Classvalves may be assignedusingpressure-
(c) A classdesignationgreaterthan Class 2500 or temperatureratingsas determinedby the method de-
a rating temperaturegreater than 1000°F applied to scribedin AnnexG in conjunctionwith the interpolation
threaded-end valvesis beyondthe scopeof thisStandard. proceduredescribedin para. 6.1.4.
(d) Threadedand socket welding-endvalves larger
than NPS 21/2are beyond the scopeof this Standard. 2.1.5 Valves Fabricated by Welding. A valve
(e) Except as provided in para. 2.5, the tabulated made wholly or partly from segmentsof castings,
ratingsare the maximumallowableworking pressures, forging,bars,plates,or tubularproductweldedtogether
expressedas gagepressure,at the temperatures shown. will merit the applicableratingsonly if:
If) Ratingsintermediateto tabulatedvaluesare deter- (a) it conformsto all applicablerequirements of this
mined by linear interpolationbetween temperatures Standard;
within a classnumberor betweenclassnumbers,except (b) weld fabricationand heat treatmentof weldsare
that for flanged-endvalves interpolationbetweentabu- in accordancewith the ASME Boiler and Pressure
lated classesis not permitted. Vessel Code, SectionVIII, Division 1;
(g) In all cases,valves shall be constructedso that (c) nondestructive examinationof weldsis in accord-
the body bonnet or cover, body, bolting, and bonnet ancewith the ASME Boiler and PressureVesselCode.
or coverboltingmeetthe 100°F pressureratingrequire- SectionVIII, Division 1, as requiredto warranta joint
ments for the designatedpressureclass or pressure- efficiency E not less than:
temperaturerating.However, pressure-temperature rat- (1) 0.80 for flanged-endand StandardClassweld-
ingsfor the valve may be otherwiselimitedby construc- ing-end valves larger than size NPS 6;
tion details or materialsconsiderations,in which case (2) 1.OOfor SpecialClasswelding-endor threaded-
the requirementsof paras.4.3.3 and 7.2.3 shallbe met. end valves in all sizes (see para. 8.3.3).
These requirementsare not applicableto seal welds
2.1.1 Standard Class Valves. Valves conforming or attachmentwelds such as for backseatbushings,
to the requirementsof this Standard,except for those seat rings, lifting lugs, and auxiliary connections.
meeting the additionalrequirementsof Section 8 for
SpecialClassvalvesor of Annex G for Limited Class 2.2 Rating Temperature
valves,shallbe designatedStandardClassvalves.Rat-
ings shall not exceedthe valuesshownin thoseTables The temperatureshownfor a corresponding pressure
2 having an identifying suffix “A”. rating is the temperatureof the pressure-containing
shell of the component.In general,this temperatureis
2.1.2 Special Class Valves. Threaded-or welding- the same as that of the contained fluid. Use of a
end valves which conform to all the requirementsof pressurerating correspondingto a temperatureother
para.2.1.1, andin additionhave successfully
passedthe than that of the containedfluid is the responsibilityof
examinationsrequiredby Section8, may be designated the user,subjectto the requirements of applicablecodes
SpecialClassvalves.Ratingsshallnot exceedthe values and regulations.
shownin those Tables 2 having an identifying suffix
“B”. SpecialClassratingsshallnot be usedfor flanged- 2.3 Temperature Effects
end valves.
Some considerationsof the effect of temperaturein
2.1.3 Limited Class Valves. Welding-or threaded- applicationare given below. Additional guidancecan
end valves in sizesNPS 2’12 and smallerthat conform be found in ASME B16.5 as related to line flange
to the requirementsof Annex G may be designated joints.
Limited Class valves. Ratings shall not exceed the
valuescalculatedin accordancewith Annex G. Limited 2.3.1 High Temperature. Applicationat tempera-
Classratingsshall not be usedfor flanged-endvalves. tures in the creep range will result in decreasingbolt
loadsas relaxationof flanges,bolts, and gasketstakes
2.1.4 Intermediate Rated Valves. A welding-or place. Flangedjoints subjectto thermalgradientsmay
threaded-endvalve may be assignedan intermediate likewisebe subjectto decreasingbolt loads.Decreased
pressure-temperature rating or Class, either Standard bolt loads diminish the capacity of the flangedjoint
or Special, in accordancewith para. 6.1.4, provided to sustainloadseffectively withoutleakage.At elevated
all other applicablerequirementsof this Standardare temperatures,flanged joints, and in particular Class
met.Correspondingly, an intermediateratingor Classfor 150, may developleakageproblemsunlesscareis taken

2
VALVES - FLANGED
THREADED, AND WELDING END ASME 616.34-1996

usingcarbonsteel bonnetbolts suchas ASTM A307, previously refined metal of a single furnace charge.
Grade B. Tensile specimensshall be cast in moldsof the same
refractoryas the castingsand shall be given the same
4.4 Conformity heattreatmentasthe castings.When investmentcastings
are used for sizes and pressureclassesgreater than
4.4.1 Designation. Valves conformingto Standard those describedabove, all the requirementsof the
Class requirements shall include the designation applicableTable 1 ASTM specificationshall be met.
“B16.34” on the identificationplate. For all Special
Class valves, the identificationplate shall include the 5.1.3 Cast Surfaces. Cast surfacesof pressure
designation “B16.34 SPL”. For all Limited Class boundarypartsshallbe in accordancewith MSS SP-55.
valves,the identificationplate shallincludethe designa-
tion “B16.34 LTD”. The use of the prefix “ASME” 5.1.4 Mechanical Properties. Mechanicalproper-
to these designationsis optional. ties shallbe obtainedfrom test specimensthat represent
the final heat-treatedconditionof the materialrequired
4.4.2 Compliance. The “B 16.34” identification by the material specification.
markingof 4.4.1 designates
thatthe valve wasmanufac-
tured in conformancewith ASME B16.34. 5.2 Material Selection

5.2.1 Service Conditions. Criteriafor the selection

5 MATERIALS of materialsare not within the scopeof this Standard.
The possibilityof materialdeteriorationin serviceand
5.1 General the need for periodic inspectionsis the responsibility
of the user. Carbide phase conversionto graphite,
The body, bonnetor cover, body joint bolting, and
oxidationof ferritic materials,decreasein ductility of
body-bonnetor cover bolting, shall be constructedof
carbonsteelsat low temperature(even in applications
materialsas listedin the respectiveASTM specifications
above20”F), andsusceptibilityto intergranular
corrosion
referredto in Table 1. Identicalmaterialsin accordance
of austeniticmaterials or grain boundary attack of
with the ASME Boiler andPressureVesselCodeSection
nickel-basealloys are among those items requiring
II may also be usedfor theseparts.It is not required
attentionby the user. A discussionof precautionary
that identical material or material form be used for
considerationscan be found in AppendixF of ASME
body and bonnet or cover parts. The rating applied,
B31.3.
however,shallbe basedon the valve body. The bonnet
or cover shallbe designedandmaterialselectedaccord- 5.2.2 Responsibility. When serviceconditionsdic-
ingly. Selectionof stems,disks,and other parts,such tatethe implementation of specialmaterialrequirements,
as bonnetgasketsand bolting, subjectto pressureand e.g., usinga Group 2 materialabove lOOO”F,it is the
other loading, must be consistentwith the applicable user’s responsibilityto so specify to the manufacturer
valve pressure-temperature rating. in orderto ensurecompliancewith metallurgicalrequire-
mentslistedin the end notesto Table 1 and the notes
5.1.1 Carbon Steel Bonnet or Cover Bolting.
in Table 2.
It is permissibleto use carbon steel, for example,
ASTM A 307, Grade B, for bonnet or cover bolting
only for Class 300 and lower, provided the service 5.3 Electrical Continuity
temperatureis limited to 400°F and marking is in Internalpartsthat are insulatedfrom the valve body
accordancewith para. 4.3.3. may build up a static electric charge.An example is
a ball valve with seats and seals of nonconductive
5.1.2 Investment Castings. When investment
materials.When service conditionsrequire electrical
castingsare usedfor bodies,bonnets,and cover plates
continuityto preventstaticdischarge,the useris respon-
of valvesin sizesNPS 4 and smallerwherethe ratings
sible for specifyingstatic grounding.
do not exceed Class 600. The requirementsof the
ASTM specifications referredto in Table 1 shallbe met,
5.4 Flange Removal
exceptthatit is permissibleto determinemechanicaland
chemicalpropertiesfrom a masterheat and to use a When an end flange is removedfrom a flanged-end
1 in. x 0.25 in. diametertensile specimenin place of valve body castingto make a weld-endvalve casting,
the standard2 in. tensile specimen.A masterheat is discontinuitiesmay be observedthat would not have

5
 VALVES - FLANGED,
ASME 616.34-1996 THREADED, AND WELDING END

been detrimental in the flanged casting. The valve neck direction. The diameter, d, is as defined in para.
manufacturer that removes an end flange from a valve 6.1.2, and rm is the minimum wall thickness as shown
body casting during the course of manufacture has in Table 3. Minimum wall thickness requirements are
responsibility for the acceptability of the resultant weld- applicable to and measured from internally wetted
end valve casting. This responsibility includes pressure surfaces, e.g., up to the point where the body-bonnet
testing the resultant weld-end valve in accordance with seal is affected.
Section 7. Beyond the aforementioned 1.1 & region, straight
circular sections of valve body necks with inside diame-
6 DIMENSIONS ter d’ shall be provided with local wall thickness at
least equal to t’ where t’ is taken from the appropriate
6.1 Body Dimensions (tabulated or intermediate) rating Class in Table 3 using
an appropriate diameter d”.
6.1.1 Wall Thickness. For inspection purposes,the
wall thickness of valve bodies at the time of manufacture For rating of Class 150 to 2500:
shall be no less than the minimum values cm shown
in Table 3, except as indicated in paras. 6.1.3 through
6.1.7, 6.2, and 6.7. When using the table, linear interpo-
lation may be used for values intermediate to those
listed. The minimum thickness requirement for the body
For ratings over Class 2500:
wall is applicable only as measured from internal wetted
surfaces. Minimum wall thickness shall not include
liners, linings, or cartridges.

6.1.2 Inside Diameter. For the purpose of de-

termining the wall thickness r,, the inside diameter d where P, is the pressure class designation as defined
is taken as the minimum diameter of the flow passage in Annex F, para. F1.3.
but not less than 90% of the basic inside diameter at (a) For the special case where d’ > 1.5d, it is
the valve end. For socket welding- and threaded-end necessary that the wall thickness be equal to or greater
valves, the socket or thread diameters and associated than r’ for the entire body neck length having diameter
counterbores or tapped bores need not be considered d’, including the aforementioned 1.1 & region.
in establishing the value of d (see paras. 6.2.3 and (b) For the special case of valve body necks having
6.2.4). For the special case of valves used between a small diameter relative to the body run diameter,
high and low pressure sections of a system where an that is, did 2 4 (for example, a butterfly valve stem
end connection is specified for a thinner pipe wall (or penetration), the minimum local wall thickness within
lower class flange) on one end than on the other, the
the region of tm (1 + 1.l &), measured starting from
inside diameter d shall be based on the end connection
with the heavier pipe wall (or higher class flange). the intersection of the body inside diameter and the
Localized variations of inside diameter associated with axis of the body neck diameter, shall be equal to t’
transitions to weld preparations need not be considered. where r’ is obtained from Table 3 using the appropriate
Note, however, limitations of proximity of body neck body neck inside diameter d’ and the appropriate pres-
in para. 6.1.5. Where linings, liners, or cartridges are sure class. This special case is illustrated in Fig. 16.
used to form the flow passage or portions of the flow Be ond the aforemention region of t, (1 + 1.1
passage, the inside diameter d shall be that at the 8 d&), valve body necks shall be provided with local
liner-body interface. For inside diameters which lie minimum wall thickness based on d”, in accordance
BETWEEN diameters for which minimum wall thick- with para. 6.1.3.
ness is tabulated, f, may be determined by linear (c) For the special case of a body neck in which
interpolation. holes are drilled or tapped in the body neck wall
parallel with the body neck axis, it is required that
6.1.3 Valve Body Necks. Valve body necks shall the sum of the ligaments at the inner and outer sides
maintain the minimum wall thickness as described in be equal to or greater than tm or f’, as applicable. The
paras. 6.1.1 and 6.1.2 within a region of 1.1 & inner ligament and the ligament at the bottom of the
measured from the outside of the body run along the drill hole shall be no less than 0.25?,,, or 0.25t’, as

6
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

applicable. Furthermore, it is required that this thickness (c) Completed Ends. After the tests required by para.
shall extend for a length along the body neck, starting 7.1 have been completed, and at the manufacturer’s
at the top of the neck, at least equal to the depth of discretion, semifinished buttwelding ends may be ma-
the hole plus a distance equal to one-half of the hole chined to final dimensions, flange gasket seating surfaces
or bolt diameter. may be machined to a final surface finish or threaded
ends may be converted to socket welding ends, all
6.1.4 Welding or Threaded End Valves with without any additional pressure testing.
Intermediate Ratings. The intermediate pressure rat-
ing class designation, Prd, and minimum wall thickness, 6.1.6 Local Areas. Local areas having less than
t,, for threaded- or welding-end valves with intermediate minimum wall thickness will be acceptable provided
pressure ratings shall be determined by linear interpola- that all of the following limitations are satisfied.
tion. The method is illustrated in (a) and (b) below. (a) The area of subminimum thickness can be en-
(a) Enter the appropriate pressure-temperature rating closed b a circle whose diameter is no greater than
table of Tables 2 with the design temperature and 0.35 /--dOtO).For valve body necks, use d, = d and
working pressure Pd, and determine the pressure rating t0 = r’ (see para. 6.1.3). For all other local areas, use
PI, next below, and P2, next above Pd, where P1 d, = d (see para 6.1.2) and to = t,,, (see para. 6.1.1 or
and P2 are ratings corresponding to pressure class 6.1.4, as appropriate);
designations PrI and P,.z. Determine the intermediate (b) Measured thickness is no less than 0.75t,;
pressure rating class designation, Prd, corresponding (c) Enclosure circles are separated from each other
to design conditions using by an edge-to-edge distance of no less than 1.75
GLZ.
prd = p,l + H (PIZ- PA)
6.1.7 Additional Metal Thickness. Additional
(b) Using the appropriate inside diameter, d, in Table metal thickness needed, for example, for assembly
3, select the minimum wall thicknesses fl and t2 corres- loads, actuating (closing and opening) loads, shapes
ponding to pressure classes Prl and Pr2 respectively. other than circular, and stress concentrations, must be
Determine the minimum wall thickness, f,, correspond- determined by individual manufacturers since these
ing to design conditions using factors vary widely. In particular, inclined stem valves,
intersections and openings in enlarged body cavities,
and some types of fabricated body valves may require
additional reinforcement to assure adequate strength
and rigidity.

6.1.5 Contours at Body Ends

6.2 End Dimensions
(a) Buttwelding Ends. The weld preparation (see
para. 6.2.1) shall not reduce the body wall thickness 6.2.1 Buttwelding Ends. Unless otherwise speci-
to less than the values required by para. 6.1.1 or 6.1.4 fied, the details of the welding-end preparation shall
within a region closer to the outside surface of the be in accordance with ASME B16.25, with the inside
body neck than t, measured along the run direction. diameter (denoted as dimension B in ASME B16.25)
The transition to the weld preparation shall be gradual having the following tolerance:
and the section must be essentially circular through (a) sizes NPS 10 smaller: 20.03 in. +
the entire length of the transition. Sharp discontinuities (6) sizes NPS 12 to 18: 2 0.06 in. 2
or abrupt changes in sections that infringe into the (c) sizes NPS 20 and larger: kO.12, -0.06 in.
transition shall be avoided, except that test collars or In all cases, the thickness of the body run or nozzle
bands, either welded or integral, are allowed. In no transition (see para. 6.1.5) starting at a distance 1.33t,
case shall the thickness be less than 0.77t,,, at a distance from the buttwelding end, shall be no less than 0.77f,.
of 1.33t, from the weld end.
(b) Socket Welding and Threaded Ends. The distance 6.2.2 Flanged Ends. Flanged ends shall be pre-
from the center line of generally cylindrical flow pas- pared with flange facing, nut-bearing surfaces, outside
sages to the external surface of the body run shall be diameter, thickness, and drilling in accordance with
no less than 0.5 times the appropriate nominal pipe ASME B16.5 requirements for flanged fittings. When
outside diameter listed in ANSI/ASME B36.10M. required, end flanges may be furnished with tapped

7
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

holes for flange bolting. Thread engagement in a pipe procedure, both in accordance with ASME Boiler and
flange assembly with tapped holes shall provide full Pressure Vessel Code, Section IX.
effective thread engagement, not including the cham-
fered threaded, for a length at least equal to the nominal 6.3.2 Pipe Thread Tapping. Holes may be tapped
diameter of the thread. For additional considerations, in the wall of a valve if the metal is thick enough to
see para. 6.4.3. allow the effective thread length specified in Fig. 2.
Where metal thickness is insufficient or the tapped hole
6.2.3 Socket Welding Ends. The socket bore needs reinforcement, a boss shall be added as shown
diameter, depth of socket, and end surfaces shall be in Fig. 5.
in accordance with ASME B 16.11. The minimum thick-
6.3.3 Socket Welding. Sockets may be provided
ness of the socket wall extending over the socket
in the wall of a valve if the metal is thick enough to
depth, including any associated counterbore, shall be
accommodate the depth of socket and retaining wall
in accordance with Table 4.
specified in Fig. 3. Where the metal thickness is insuffi-
cient or the socket opening requires reinforcement, a
6.2.4 Threaded Ends. End connections shall have
boss shall be added as shown in Fig. 5. The length
taper pipe threads in accordance with ANSI/ASME
of the leg of the attachment weld shall be not less
B 1.20.1. The minimum thickness of the wall extending
than 1.09 times the nominal pipe wall thickness of the
over the length of the thread, including any associated
auxiliary connection or 0.12 in., whichever is greater.
tap bore or counterbore, shall be in accordance with
Table 4. Thread lengths and gaging requirements shall
6.3.4 Butt Welding. Auxiliary connections may be
be in accordance with ASME B16.11.
attached by butt welding directly to the wall of the
valve (see Fig. 4). Where the size of the opening is
6.2.5 Intermediate Rated Socket Welding- and
such that reinforcement is necessary, a boss shall be
Threaded-End Valves. The minimum socket wall
added as shown in Fig. 5.
thickness and the minimum threaded-end wall thickness
for valves with intermediate ratings may be determined 6.3.5 Bosses. Where bosses are required, the in-
by interpolation using the method of para. 6.1.4(b) scribed diameters shall be not less than those shown
using wall thickness values from Table 4. in Fig. 5 and the height shall provide metal thickness
to satisfy the requirements of Fig. 2 or 3.
6.2.6 End to End. End-to-end dimensions and face-
to-face dimensions shall be in accordance with ASME 6.3.6 Size. Unless otherwise specified, auxiliary
B16.10 or other dimensions by agreement between connections shall be as follows:
manufacturer and purchaser. For some valve types, both
Valve Size, NPS Connection, NPS
long and short pattern dimensions are listed in ASME
B16.10. It should not be assumed that all designs of 2-4 ‘4
the type listed can be accommodated in the short pattern 5-8 Sk
10 and up 1
dimension series. For example, full port top entry ball
valves cannot, in all cases, be fitted to the short pattern
dimensions. For valves not included in ASME B16.10, 6.3.7 Designating Locations. A means of desig-
dimensions shall be the manufacturer’s standard. nating locations for auxiliary connections for some
valve types is shown in Fig. 1. Each of these locations
is designated by a letter so that the desired locations
6.3 Auxiliary Connections
for the illustrated types of valves may be specified
without using further sketches or description.
6.3.1 General. Auxiliary connections shall be de-
signed, fabricated, and examined so as to warrant at
least the same pressure-temperature ratings as the valve 6.4 Valve Joints
and shall be installed prior to the shell test of the Valves with bolted or threaded bonnet, cover, or body
valve to which they are attached, except that upon joints shall meet the requirements of this subsection.
agreement between the manufacturer and purchaser,
auxiliary connections installed after the valve shell tests 6.4.1. Bonnet or Cover Joints. Valve bonnet or
are acceptable. Welded auxiliary connections shall be cover joints are joints that are not subject to direct
made by a qualified welder using a qualified welding piping loads.

8
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

(a) Bolted Bonnet or Cover Joints. Bolting shall be specified service conditions. Since these factors vary
threaded in accordance with ANSI B 1.l and, as a widely, these requirements must be determined by
minimum, shall satisfy the following bolt cross-sectional individual manufacturers.
area requirements:

6.5 Stems
P, 2 5 0.45s, I 9000
Special consideration for stems for certain valve
(b) Threaded Bonnet or Cover Joints. Thread shear types shall be as follows.
area, as a minimum, shall satisfy the following.
6.5.1 Stem Retention. Valves shall be designed
y 2 4200
so that the stem seal retaining fasteners (e.g., packing
s gland fasteners) alone do not retain the stem. Specifi-
cally, the design shall be such that the stem shall not
where be capable of removal from the valve, while the valve
S, = allowable bolt stressat lOO”F, psi (when greater is under pressure, by the removal of the stem seal
than 20,000 psi, use 20,000 psi) retainer (e.g., gland) alone.
P, = pressurerating class designation, psi (see Annex
F, para. F1.3) 6.5.2 Position Indication. Valves of the quarter-
A, = area bounded by the effective outside periphery turn type (e.g., ball, plug, or butterfly) shall have a
of a gasket or O-ring or other seal effective means to indicate the ball, plug, or disk position. The
periphery, except that in the case of a ring- design shall be such that the components of the indicat-
joint the bounded area is defined by the pitch ing means cannot be assembled to falsely indicate the
diameter of the ring, sq in. valve open or closed position.
A6 = total effective bolt tensile stress area, sq in.
A, = total effective thread shear area, sq in.
The allowable stress values shall be taken from the 6.6 Installation Limitations
ASME Boiler and Pressure Vessel Code, Section VIII,
Division 1, or Section III, Division 1, Class 2 or Class 3. 6.6.1 Single Flange Installation. Flanged and
wafer or flangeless valves are intended for installation
6.4.2 Body Joints. Valves with bodies of sectional between flange pairs. These valves, however, can also
construction such that bolted or threaded body joints be designed for installation against a single flange for
are subject to piping mechanical loadings shall, as a the purpose of effecting closure in dead-end piping.
minimum, satisfy the following requirements. Valves for the latter service shall be designed such
(a) Bolted Body Joints. Bolted body joints shall use that all parts which are necessary to support pressure
bolting threaded in accordance with ANSI B 1.1 and loads acting across the seating element safely support
shall, as a minimum, satisfy the following bolt cross- the maximum differential pressure rating of the valve.
sectional area requirement. Examples of such parts are end entry threaded seat
retaining ferrules of ball valves and bolted seat seal
retaining plates of butterfly valves. In the event that
the valve design cannot accommodate these pressure
loads, then the valve shall be marked to show such
(b) Threaded Body Joints. Threaded body joints shall,
installation restriction.
as minimum, satisfy the following thread shear area
requirement.
6.6.2 Disk Clearance. Valves that can be bolted
between flanges or against a flange (e.g., butterfly or
P, 2 2 3300 swing check valves) may have a disk that will, upon
s
rotation, project beyond the plane of the flange gasket.
6.4.3 Additional Considerations. Bolting or The valve design shall be such that there will be no
threading in excess of the minimum requirements of interference between the valve disk and companion
this Standard may be required because of valve design, flanges or adjacent piping for the following pipe
special gasket compression requirements, or special schedules.

9
 VALVES - FLANGED,
ASME 616.34-1996 THREADED, AND WELDING END

Pressure Class Valve Size, NPS Pipe Schedule next higher 25 psi increment. The test shall be made with
150 2-24 40 water, which may contain a corrosion inhibitor, with kero-
300 2-24 80 sene, or with other suitable fluid,’ provided such fluid has
600 2-6 80 viscosity not greaterthan that of water, at a temperaturenot
600 8-14 100
above 125°F. Visually detectableleakagethroughpressure
boundary walls not acceptable. Test duration shall be not
For other valve sizes and pressureclasses,pipe inside less than shown below.
diameter and disk clearance shall be as agreed between
manufacturer and purchaser. Valve Size, NPS Test Time, set

2 and smaller 15
6.7 Wafer of Flangeless Valves 2.5-8 60
10 and larger 180
The design of valves that can be bolted between
flanges or against a flange (e.g., butterfly valves) shall Test shall be made with the valve in the partially
conform to the applicable requirements for flanged open position. Leakage through the stem packing shall
valves and the requirements of (a) through (g) below not be cause for rejection, however, stem seals shall
(see Fig. 17). be capable or retaining pressure at least equal to the
(a) The design shall provide for boltup using all of 100°F ratings without visible leakage.
the bolt holes and bolt circle of the specified flange.
(b) Bolt holes, parallel to the body run, may be 7.2 Valve Closure Tests3
either threaded or unthreaded. Threaded holes may be
blind holes suitable for use with bolt studs. When Each valve designed for shut-off or isolation service,
threaded, full-thread engagement, excluding chamfers, such as a stop valve, and each valve designed for
shall be provided to a depth not less than one nominal limiting flow reversal, such as a check valve, shall be
bolt diameter. given a closure test. The test fluid shall be as in para.
(c) The required minimum valve body wall thickness 7.1. The test pressure shall be not less than 110% of
rmshall be measured from the valve body inside circum- the 100°F rating except that, at the manufacturer’s
ference out to the lesser of the valve body outside option, a gas closure test at gage pressure not less
circumference or the circumference of a circle inscribed than 80 psi may be substituted for valve sizes and
through the inner tangent points to the flange bolt holes. pressure classes shown below.
(d) The inner ligament (e of Fig. 17) of either a
Valve Size, NPS Pressure Class
through-hole or a blind threaded hole in the vicinity
of a stem penetration shall not be less than 25% of 12 and smaller 400 and lower
4 and smaller All
the required wall thickness of body neck but in no
case less than 0.1 in.
The closure test shall follow the shell test except
(e) The inner ligament (f of Fig. 17) for holes
that for valves NPS 4 and smaller with ratings Class
parallel to the body run shall not be less than 0.25&
1500 and lower the closure test may precede the shell
but in no case less than 0.1 in. The sum of the inner
test when a gas closure test is used. The closure test
and outer ligaments shall not be less than rm.
duration shall be not less than shown below.
cf) A ligament within the minimum body wall be-
tween two adjacent holes within the minimum body Valve Size, NPS Test Time, set
wall (j of Fig. 17) shall be 0.25t,,, or greater but not
2 and smaller 15
less than 0.1 in. 21/T8 30
(g) The inner ligament of a radial blind hole (c of lo-18 60
Fig. 17) shall not be less than 0.75t,,,. 20 and larger 120

7 PRESSURE TESTING
2 There are hazards involved when gas is used as the fluid for testing.
Appropriate precautions are required when a gas is used.
7.1 Shell Test 3 Closure tightnessrequirementsvary with intended service application
and are not considered,to be within the scope of this Standard. For
Each valve shall be given a shell test at a gage pressure guidance in this regard see, for example, MSS SP-61 or API-598.
no less than 1.5 times the 100°F rating, rounded off to the

10
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

A 30 deg.

ts
30 deg.

Section X-X

FIG. 14 CONDUIT GATE BODY (PRESSURE SEAL BONNET)

FIG. 15 DISHED COVER FIG. 16 FLAT COVER

21
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

Eli

r9
h

Radial hole/’ \

Blind axial hole- stern bore

Relationship Reference

t 2 tm 6.1.1 [Note 21
m 2 t; 6.1.3(b) [Note 21
n 2 t6 6.1.3(b) [Notes 2, 31
L rt,(l 6.1.3(b)
+ 1.1 m
f 2 0.25 t,,, [Note I] 6.7(e)
f+g2t, 6.7(e)
f’ 2 0.25 t; [Note l] 6.1.3(c)
f’+g’>t$ 6.1.3(c)
c 2 0.75 tm 6.7M
j 2 0.25 tm [Note l] 6.7(f)
e 2 0.25 t; [Note I] 6.7[d)
Notes
(I) In no case less than 0.1 in.
(2) Except where para. 6.1.6 applies.
(3) If di is located outside of the stem seal, i.e., beyond
the internal wetted perimeter, the minimum thickness
requirements shall be determined by the manufacturer.

FIG. 17 BUTTERFLY VALVE BODY

22
 TABLE 1 MATERIAL SPECIFICATION LIST
Applicable ASTM Specification
GROUP 1 MATERIALS
Material Product Form

Forgings Castings Plates

Group Nominal Spec. Spec. Spec. Spec.

No. Designation No. Grade No. Grade No. Grade No.

C A 675
1.1 C-Si A 105 A 216 WCB A515 70 A 105
C-Mn-Si A 350 LF2 A516 70 A 350
A 537 Cl. 1 A 696

C-Si
1.2 P?iNi A 352 LC2 A 203 B
3’/2Ni A 350 LF3 A 352 LC3 A 203 E A 350
C-Mn-Si A 216 WCC
A 352 LCC

C A675
1.3 C-Si A 352 LCB A515 65
25iNi A 203 A
3’/2Ni A 203 D
C-Mn-Si A516 65

C A 675
1.4 C-Si A515 60

C-Mn-Si A 350 LFl A516 60 A 350

A 696

1.5 C--SiMo A 182 Fl A 217 WC1 A 204 A A 182

A 352 LCl A 204 B

C-‘/*MO
1.6
/‘$r-‘/zMo A 387 2 Cl. 1
A 387 2 Cl. 2
1Cr-‘/2Mo A 387 12 Cl. 1

C-‘/2Mo A 204 C
1.7 /‘zCr-‘/2Mo A 182 F2 A 182
Ni-‘QZr-‘/zMo A217 WC4
3/4Ni-Mo-%‘,,‘Cr A 217 WC5

/Table 1 continues on the next page/

 TABLE 1 MATERIAL SPECIFICATION LIST (CONT’D)
Applicable ASTM Specification
GROUP 1 MATERIALS (CONT’D)
T Product Form

Forgings Castings Plates

Group Nominal Spec. Spec. Spec. Spec.

No. Designation No. Grade No. Grade No. Grade No.

lCr-‘/2Mo A 387 12 Cl. 2

1.8

1L
‘ ~Cr-~zMo-Si A 387 11 Cl. 1

27&r-1 Mo A 387 22 ct. 1

I
Y 1 Cr-‘/zMo A 182 F12CI.2 A 182
1.9 1&‘ r-SiMo-Si A 182 Fll Cl.2 A 387 11 Cl. 2 A 182
1 I/4Cr-1/2Mo A 217 WC6 A 739

2’&r-1 MO A 182 F22 Cl. 3 A 217 WC9 A 387 22 Cl. 2 A 182

1.10 A 739

3Cr-1 Mo A 182 F21 A 387 21 Cl. 2 A 182

1.11 Mn-SiMo A 302 A&B
Mn--sV2Mo-‘/2Ni A 302 C
Mn-1/2Mo-?‘..‘Ni A 302 D
C-Mn-Si A 537 CL2

5Cr-‘/zMo A 387 5 Cl. 1

1.12 A 387 5 Cl. 2

5Cr-%Mo-Si

5Cr-‘/2Mo A 182 F5a A217 C5 A 182

1.13 Al82 F5 A 182

1.14 9Cr-1 MO Al82 F9 A 217 Cl2 I A 182

 TABLE 1 MATERIAL SPECIFICATION LIST
Applicable ASTM Specification
GROUP 2 MATERIALS
Material T Product Form

Forgings Castinas Plates

Group Nominal Spec. Spec. Spec. Spec.

No. Designation No. Grade No. Grade No. Grade No.

18Cr-8Ni A 182 F304 A 351 CF3 A 240 304 A 182

2.1 A 182 F304H A 351 CF8 A 240 304H A 182
A 479
A 479

16Cr-2Ni-2Mo A 182 F316 A 240 316 A 182

2.2 A 182 F316H A 240 316H A 182
A 479
A 479
k!

18Cr-8Ni A 351 CF3A

A 351 CF8A
18Cr-13Ni3Mo A 240 317
16Cr-12Ni-2Mo A 351 CFBM
A 351 CF8M
19Cr-lONi3Mo A 351 CG8M

18Cr-8Ni A 182 F304L A 240 304L A 182

2.3 A 479
16Cr-12Ni-2Mo A 182 F316L A 240 316L A 182
A 479

18Cr-1 ONi-Ti A 182 F321 A 240 321 A 182

2.4 A 182 F321H A 240 321H A 479
A 182
A 479

/Table 1 continues on the next page]

 TABLE 1 MATERIAL SPECIFICATION LIST (CONT’D)
Applicable ASTM Specification
GROUP 2 MATERIALS (CONT’D)
Material I Product Form

Castings I Plates

spec. Spec. Spec.

No. Grade No. Grade No. Grade

A 162 F347 A 351 CFIC A 240 347 A 18

2.5 A 162 F347H A240 347H A 18
Al62 F348 A240 348 A 18
A 182 F348H A240 348H A 18
A 47

A 47
A 47
A 47

25Cr-12Ni A 351 CH8

2.6 A 351 CH20
23Cr-12Ni A 240 309s
A240 309H

1 25Cr-20Ni A 182 F3lOH A 351 CK20 A240 310s A 18

2.7 A240 310H A 47
I A 47

A 182 F44 A 351 CK3MCuN A 240 S31254

A 47
A 182 F51 A240 S31803 A 47

A 182 F53 A240 S32750 A 47

VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-1.5
RATINGS FOR GROUP 1.5 MATERIALS
A 162 Gr. Fl (1) A 204 Gr. A (1) A 352 Gr. LCl (3) A 691 Gr. CM-70 (1)
A 204 Gr. A (1) A 217 Gr. WC1 (l)(2)

NOTES:
(1) Upon prolonged exposure to temperatures above 675°F. the carbide phase of Carbon-molybde-
num steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 875°F.
(2) Use normalized and tempered material only.
(3) Not to be used over 650°F.

TABLE 2-1.5A STANDARD CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 265 695 925 1,390 2,085 3,470 5,785 10,415
200 260 680 905 1,360 2,035 3,395 5,660 10,185
300 230 655 870 1,305 1,955 3,260 5,435 9,780
400 200 640 855 1,280 1,920 3,200 5,330 9,595
500 170 620 830 1,245 1,865 3,105 5,180 9,320

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 280 375 560 845 1,405 2,345 4,215
1000 20 165 220 330 495 825 1.370 2,470

TABLE 2-1.58 SPECIAL CLASS

T Working Pres! *es by Class1es. Psi9

Temperature, “F 150 300 400 900 1500 2500 4500

-20 to 100 265 695 925 1,390 2,085 3,470 5,785 10,415
200 265 695 925 1,390 2,085 3,470 5,785 10,415
300 265 695 925 1,390 2,085 3,470 5,785 10,415
400 265 695 925 1,390 2,085 3,470 5,785 10,415
500 265 695 925 1,390 2,085 3,470 5,785 10,415

600 265 695 925 1,390 2,085 3,470 5,785 10,415

650 265 695 925 1,390 2,085 3,470 5,785 10,415
700 265 695 925 1,390 2,085 3,470 5,785 10,415
750 265 695 925 1,390 2,085 3,470 5,785 10,415
800 265 695 925 1,390 2,085 3,470 5,785 10,415

850 260 680 905 1,355 2,030 3,335 5,645 10,160

900 225 590 785 1,175 1,760 2,935 4,895 8,810
950 135 350 470 705 1,065 1,755 2,930 5,270
1000 80 205 275 410 615 1,030 1,715 3,085

37
 VALVES - FLANGED,
ASME 616.34-1996 THREADED, AND WELDING END

TABLE 2-1.6
RATINGS FOR GROUP 1.6 MATERIALS
A 335 Gr. PI (l)(3) A 367 Gr. 12 Cl. 1 (2) A 387 Gr. 2 Cl. 2 (3) A 691 Gr. /2CR
‘ (3)
A369 Gr. FPI (l)(3) A 387 Gr. 2 Cl. 1 (3)

NOTES:
(1) Upon prolonged exposure to temperatures above 875°F. the carbide phase of Carbon-molybde-
num steel may be converted to graphite. Permissible, but not recommended for prolonged
use above 875°F.
(2) Permissible, but not recommended for prolonged use above 1100°F.
(3) Not to be used over 1000°F.

TABLE 2-1.6A STANDARD CLASS

-r Working Pressures by Classes )sig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 225 590 790 1,185 1,775 2,955 4,930 8,870
200 225 590 790 1,185 1,775 2,955 4,930 8,870
300 225 590 790 1,185 1,775 2,955 4,930 8,870
400 200 570 765 1,145 1,715 2,880 4,765 8,580
500 170 550 735 1,105 1,655 2,755 4,595 8,270

600 140 535 710 1,065 1,600 2,665 4,440 7,990

650 125 525 695 1,045 1,570 2,615 4,355 7,840
700 110 510 685 1,025 1,535 2,560 4,270 7,685
750 95 475 630 945 1,420 2,365 3,945 7,095
800 80 475 830 945 1,420 2,365 3,945 7,095

850 65 460 615 920 1,380 2,295 3,830 6,890

900 50 440 590 885 1,325 2,210 3,685 6,635
950 35 315 420 630 945 1,575 2,630 4,730
1000 20 200 270 405 605 1,010 1,685 3,035
1050 20(l) 155 205 310 465 770 1,285 2,315

1100 20(l) 95 130 190 290 480 800 1,440

1150 20(l) 60 80 125 185 310 515 925
1200 15(l) 40 50 75 115 190 315 565

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

38
VALVES-FLANGED
THREADED,ANDWELDlNG END ASME 816.34-1996

TABLE 2-1.13
RATINGS FOR GROUP 1.13 MATERIALS
A182Gr.F5 A 182 Gr.F5a A 217 Gr. C5 (1)

NOTE:
(1) Use normalized and tempered material only.

TABLE 2-1.13A STANDARD CLASS

I Working Pressures by Classes bsig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 745 995 1,490 2,235 3,725 6,205 11,170
300 230 715 955 1,430 2,150 3,580 5,965 10,740
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 705 1,055 1,585 2,640 4,400 7,920
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 645 965 1,450 2,415 4,030 7,250

900 50 370 495 740 1,110 1,850 3,085 5,555
950 35 276 365 550 825 1,370 2,285 4,115
1000 20 200 265 400 595 995 1,655 2,985
1050 20(l) 145 190 290 430 720 1,200 2,160

1100 20(l) 100 135 200 300 495 830 1,490

1150 20(l) 60 80 125 185 310 515 925
1200 15(l) 35 45 70 105 170 285 515
L

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

TABLE 2-1.13B SPECIAL CLASS

r Workina Pressures bv ClasseIS. psi9
Temperature, “F 150 300 400 l--=--- 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 8,250 11,250
300 280 730 970 1,455 2,185 3,645 6,070 10,930
400 275 720 960 1,440 2,160 3,600 6,000 10,800
500 275 720 960 1,440 2,160 3,600 6,000 10,800

600 270 705 945 1,415 2,120 3,535 5,895 10,605

650 270 700 930 1,395 2,095 3,495 5,820 10,480
700 265 685 915 1,370 2,055 3,430 5,715 10,285
750 255 660 880 1,320 1,980 3,300 5,500 9,900
800 245 640 850 1,275 1,915 3,195 5,320 9,580

850 230 605 805 1,210 1,815 3,020 5,035 9,065

900 175 465 615 925 1,390 2,315 3,855 6,945
950 130 345 455 685 1,030 1,715 2,855 5,145
1000 95 250 330 495 745 1,245 2,070 3,730
1050 70 180 240 360 540 900 1,500 2,700

1100 50 125 165 250 375 620 1,035 1,865

1150 30 75 105 155 230 385 645 1,155
1200 15 45 55 85 130 215 355 645

51
 VALVES - FLANGED,
ASME 616.34-1996 THREADED,ANDWELDlNGEND

TABLE 2-1.14
RATINGS FOR GROUP 1.14 MATERIALS
A 182 Gr.F9 A217 Gr.Cl2 (I)

NOTE:
(I) Use normalized and tempered material only.

TABLE 2-1.14A STANDARD CLASS

Working Pressures bv Classe! wig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 375 505 755 1,130 1,885 3,145 5,655
1000 20 255 340 505 760 1,270 2,115 3,805
1050 20(l) 170 230 345 515 855 1,430 2,570

1100 20(l) 115 150 225 340 565 945 1,695

1150 20(l) 75 100 150 225 375 630 1,130
1200 20(l) 50 70 105 155 255 430 770

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

TABLE 2-1.148 SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,655 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6,000 10,800

850 260 680 905 1,355 2,030 3,385 5,645 10,160

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 180 470 630 945 1,415 2,355 3,930 7,070
1000 120 315 425 635 950 1,585 2,645 4,755
1050 80 215 285 430 645 1,070 1,785 3,215

1100 55 140 190 285 425 710 1,180 2,120

1150 35 95 125 190 285 470 785 1,415
1200 25 65 85 130 195 320 535 965

52
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-2.1
RATINGS FOR GROUP 2.1 MATERIALS
A 182 Gr. F304(1) A312 Gr.TP304(1) A358Gr.304 (1) A430 Gr.FP304H
A 182 Gr. F304H A 312 Gr.TP304H A 376 Gr.TP304 (1) A479 Gr.304 (I)
A 240 Gr.304 (1) A 351 Gr.CF3(2) A376 Gr.TP304H A479 Gr.304H
A240 Gr.304H A 351 Gr.CF8(1) A430 Gr.FP304(1)

NOTES:
(1) At temperatures over 1000°F. use only when the carbon content is 0.04% or higher.
(2) Not to be used over 800°F.

TABLE 2-2.1A STANDARD CLASS

l- Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 230 600 800 1,200 1,800 3,000 5,000 9,000
300 205 540 720 1,080 1,620 2,700 4,500 8,100
400 190 495 660 995 1,490 2,485 4,140 7,450
500 170 465 620 930 1,395 2,330 3,880 6,985

600 140 435 580 875 1,310 2,185 3,640 6,550

650 125 430 575 860 1,290 2,150 3,580 6,445
700 110 425 565 850 1,275 2,125 3,540 6,370
750 95 415 555 830 1,245 2,075 3,460 6,230
800 80 405 540 805 1,210 2,015 3,360 6,050

850 65 395 530 790 1,190 1,980 3,300 5,940

900 50 390 520 780 1,165 1,945 3,240 5,830
950 35 380 510 765 1,145 1,910 3,180 5,725
1000 20 320 430 640 965 1,605 2,675 4,815
1050 20(l) 410 615 925 1,545 2,570 4,630

1100 20(l) 255 345 515 770 1,285 2,145 3,855

1150 20(l) 200 265 400 595 995 1,655 2,985
1200 20(l) 155 205 310 465 770 1,285 2,315
1250 20(l) 115 150 225 340 565 945 1,695
1300 20(l) 85 115 170 255 430 715 1,285

1350 20(l) 60 80 125 185 310 515 925

1400 20(l) 50 65 95 145 240 400 720
1450 15(l) 35 45 70 105 170 285 515
1500 10(l) 25 35 55 80 135 230 410

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.
 VALVES-FLANGED,
ASME 616.34-1996 THREADED,ANDWELDlNG END

TABLE 2-2.1 (CONT’D)

RATINGS FOR GROUP 2.1 MATERIALS
A 182 Gr. F304(1) A 312 Gr.TP304(1) A358 Gr.304(1) A430 Gr.FP304H
Al82 Gr.F304H A312 Gr.TP304H A376 Gr.TP304(1) A479 Gr.304 (1)
A 240 Gr.304(1) A 351 Gr.CF3 (2) A376Gr.TP304H A479 Gr.304H
A 240 Gr.304H A351 Gr.CF8(1) A430 Gr. FP304 (1)

NOTES:
(1) At temperatures over 1000°F. use only when the carbon content is 0.04% or higher.
(2) Not to be used over 800°F.

TABLE 2-2.1B SPECIAL CLASS

r Working Pressures by Classes, psig

Temperature,'F 150 300 400 600 900 1500 2500 4600

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 255 870 890 1,355 2,005 3,345 5,570 10,030
300 230 600 800 1,200 1,800 3,000 5,000 9,000
400 210 555 735 1,105 1,660 2,765 4,605 8,295
500 200 520 690 1,035 1,555 2,595 4,320 7,780

600 185 490 650 975 1,465 2,440 4,065 7,315

650 185 480 640 960 1,440 2,395 3,995 7,190
700 180 470 630 945 1,415 2,355 3,930 7,070
750 175 465 615 925 1,390 2,315 3,855 6,945
800 175 450 600 900 1,350 2,250 3,750 6,750

850 170 440 590 885 1,325 2,205 3,680 6,620

900 165 435 575 865 1,300 2,165 3,605 6,495
950 165 425 565 850 1,275 2,120 3,535 6,385
1000 155 405 545 815 1,220 2,035 3,395 6,105
1050 150 385 515 770 1,115 1,930 3,215 5,785

1100 125 320 430 645 965 1,605 2,680 4,820

1150 95 250 330 495 745 1,245 2,070 3,730
1200 75 195 255 385 580 965 1,605 2,895
1250 55 140 190 285 425 705 1,180 2,120
1300 40 105 145 215 320 535 895 1,605

1350 30 75 105 155 230 385 645 1,155

1400 25 60 80 120 180 300 500 900
1450 15 45 55 85 130 215 355 645
1500 15 35 45 70 105 170 285 515

54
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-2.2
RATINGS FOR GROUP 2.2 MATERIALS
A 182 Gr. F316 (1) A 312 Gr. TP316 (1) A351 Gr.CFaA(2) A430 Gr.FP316(1)
Al82 Gr.F316H A312Gr.TP316H A351 Gr.CFIH(l) A430 Gr.FP316H
A240 Gr.316 (1) A312 Gr.TP317 (1) A358 Gr.316(1) A479 Gr.316(1)
A240 Gr.318l-l A351 Gr.CF3A(2) A376 Gr.TP316(1) A479 Gr.316H
A240 Gr.317 (1) A351 Gr.CF3H (3) A376 Gr.TP316H A351 Gr.CG8H (4)

NOTES:
(1) At temperatures over 1000°F. use only when the carbon content is 0.04% or higher.
(2) Not to be used over 650°F.
(3) Not to be used over 850°F.
(4) Notto be used over 1000°F.

TABLE 2.2.2A STANDARD CLASS

T Working Pressures bv Classel s. Psi9

Temperature, “F 150 300 400 600 900 1500 2500 4500

-2oto 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 235 620 825 1,240 1,860 3,095 5,160 9,290
300 215 560 745 1,120 1,680 2,795 4,660 8,390
400 195 515 685 1,025 1,540 2,570 4,280 7,705
500 170 480 635 955 1,435 2,390 3,980 7,165

600 140 450 600 900 1,355 2,255 3,760 6,770

650 125 445 590 890 1,330 2,220 3,700 6,660
700 110 430 580 870 1,305 2,170 3,620 6,515
750 95 425 570 855 1,280 2,135 3,560 6,410
800 80 420 565 845 1,265 2,110 3,520 6,335

850 65 420 555 835 1,255 2,090 3,480 6,265

900 50 415 555 830 1,245 2,075 3,460 6,230
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 350 465 700 1,050 1,750 2,915 5,245
1050 20(l) 345 460 685 1,030 1,720 2,865 5,155

1100 20(l) 305 405 610 915 1,525 2,545 4,575

1150 20(l) 235 315 475 710 1,185 1,970 3,550
1200 20(l) 185 245 370 555 925 1,545 2,775
1250 20(l) 145 195 295 440 735 1,230 2,210
1300 20(l) 115 155 235 350 585 970 1,750

1350 20(l) 95 130 190 290 480 800 1,440

1400 20(l) 75 100 150 225 380 630 1,130
1450 20(l) 60 80 115 175 290 485 875
1500 20(l) 40 55 85 125 205 345 620

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

55
 VALVES - FLANGED,
ASME 616.34-1996 THREADED, AND WELDING END

TABLE 2-2.2 (CONT’D)

RATINGS FOR GROUP 2.2 MATERIALS
A 162 Gr. F316 (1) A 312 Gr. TP316 (1) A 351 Gr. CWA (2) A 430 Gr. FP316 (I)
A 162 Gr. F316H A 312 Gr. TP316H A 351 Gr. CFIH (1) A 430 Gr. FP316H
A 240 Gr. 316 (1) A 312 Gr. TP317 (1) A 356 Gr. 316 (I) A 479 Gr. 316 (1)
A 240 Gr. 316H A 351 Gr. CF3A (2) A 376 Gr. TP316 (1) A 479 Gr. 316H
A 240 Gr. 317 (1) A 351 Gr. CF3H (3) A 376 Gr. TP316H A 351 Gr. CGIH (4)

NOTES:
(1) At temperatures over lOOO”F, use only when the carbon content is 0.04% or higher.
(2) Not to be used over 650°F.
(3) Not to be used over 650°F.
(4) Not to be used over 1000°F.

TABLE 2-2.2B SPECIAL CLASS

T Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 265 690 920 1,360 2,070 3,450 5,750 10,350
300 240 625 630 1,250 1,670 3,120 5,200 9,360
400 220 570 760 1,140 1,710 2,650 4,750 6,550
500 205 530 710 1,065 1,595 2,655 4,430 7,970

600 195 505 670 1,005 1,510 2,520 4,195 7,555

650 190 495 655 965 1,460 2,465 4,105 7,395
700 165 465 645 970 1,455 2,420 4,035 7,265
750 160 475 635 950 1,425 2,360 3,965 7,135
600 160 470 630 945 1,415 2,355 3,930 7,070

650 160 465 620 930 1,400 2,330 3,665 6,990

900 175 465 615 925 1,390 2,315 3,655 6,945
950 175 460 610 915 1,375 2,290 3,615 6,670
1000 160 420 560 a40 1,260 2,105 3,505 6,310
1050 160 420 560 a40 1,260 2,105 3,505 6,310

1100 145 360 510 765 1,145 1,905 3,160 5,720

1150 115 295 395 590 665 1,460 2,465 4,435
1200 90 230 310 465 695 1,155 1,930 3,470
1250 70 165 245 370 555 920 1,535 2,765
1300 55 145 195 290 435 730 1,215 2,165

1350 45 120 160 240 360 600 1,000 1,600

1400 35 95 125 190 265 470 765 1,415
1450 30 75 100 145 200 365 610 1,095
1500 20 50 70 105 155 260 430 770

56
VALVES-FLANGED
THREADED,ANDWELDlNG END ASME 616.34-1996

TABLE 2-2.3
RATINGS FOR GROUP 2.3 MATERIALS
A 162 Gr. F304L (1) A 240 Gr.304L (1) A312 Gr.TP304L (1) A479 Gr.304L (1)
Al62 Gr.F316L A 240 Gr.316L A312 Gr.TP316L A479Gr.316L

NOTE:
(1) Not to be used over 800°F.

TABLE 2-2.3A STANDARD CLASS

Working Pressures byClasses,psig

Temperature,"F 150 300 400 600 900 1500 2500

-2oto 100 230 600 600 1,200 1,800 3,000 5,000 9,000
200 195 505 675 1,015 1,520 2,530 4,220 7,595
300 175 455 605 910 1,360 2,270 3,780 6,805
400 160 415 550 825 1,240 2,065 3,440 6,190
500 145 380 510 765 1,145 1,910 3,180 5,725

600 140 360 480 720 1,080 1,800 3,000 5,400

650 125 350 470 700 1,050 1,750 2,920 5,255
700 110 345 460 685 1,030 1,715 2,860 5,150
750 95 335 450 670 1,010 1,680 2,800 5,040
600 80 330 440 660 985 1,645 2,740 4,930

850 65 320 430 645 965 1,610 2,680 4,825

TABLE 2-2.38 SPECIAL CLASS

r Working Pressures by Classes, psig

Temperature,"F 150 300 400 600 900 1500

-2oto 100 255 670 890 1,340 2,005 3,345 5,570 10,030
200 215 565 755 1,130 1,695 2,825 4,710 8,460
300 195 505 675 1,010 1,520 2,530 4,215 7,585
400 175 460 615 920 1,365 2,305 3,840 6,910
500 165 425 570 850 1,280 2,130 3,550 6,390

600 155 400 535 805 1,205 2,010 3,350 6,025

650 150 390 520 760 1,170 1,950 3,250 5,850
700 145 380 510 765 1,145 1,910 3,160 5,720
750 145 375 500 745 1,120 1,865 3,110 5,595
800 140 365 490 735 1,110 1,835 3,060 5,505

850 140 360 480 750 1,075 1,795 2,990 5,385

57
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-2.4
RATINGS FOR GROUP 2.4 MATERIALS
A 182 Gr. F321 (2) A 312 Gr. TP321 (2) A 376 Gr. TP321 (2) A 430 Gr. FP321H
A 182 Gr. F321H (1) A 312 Gr. TP321H A 376 Gr. TP321 H A 479 Gr. 321 (2)
A 240 Gr. 321 (2) A 358 Gr. 321 (2) A 430 Gr. FP321 (2) A 479 Gr. 321H
A 240 Gr. 321H (1)

NOTES:
(1) At temperatures over lOOO”F, use only if the material is heat treated by heating to a minimum
temperature of 2000°F.
(2) Not to be used over 1000°F.

TABLE 2-2.4A STANDARD CLASS

T Working Pressures by Classes, psig

Temperature,'F 150 306 400 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 245 645 860 1,290 1,935 3,230 5,380 9,685
300 230 595 795 1,190 1,785 2,975 4,960 8,930
400 200 550 735 1,105 1,655 2,760 4,600 8,280
500 170 515 685 1,030 1,545 2,570 4,285 7,715

600 140 485 650 975 1,460 2,435 4,060 7,310

650 125 480 635 955 1,435 2,390 3,980 7,165
700 110 465 620 930 1,395 2,330 3,880 6,985
750 95 460 610 915 1,375 2,290 3,820 6,875
800 80 450 600 900 1,355 2,255 3,760 6,770

850 65 445 595 895 1,340 2,230 3,720 6,695

900 50 440 590 885 1,325 2,210 3,680 6,625
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 355 475 715 1,070 1,785 2,970 5,350
1050 20(l) 315 415 625 940 1,565 2,605 4,690

1100 20(l) 270 360 545 615 1,360 2,265 4,075

1150 20(l) 235 315 370 710 1,185 1,970 3,550
1200 20(l) 185 245 365 555 925 1,545 2,775
1250 2011) 140 185 280 420 705 1,170 2,110
1300 20(l) 110 145 220 330 550 915 1,645

1350 20(l) 85 115 170 255 430 715 1,285

1400 2011) 65 85 130 195 325 545 975
1450 20(l) 50 70 105 155 255 430 770
1500 20(l) 40 50 75 115 190 315 565
NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

58
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-2.7 (CONT’D)

RATINGS FOR GROUP 2.7 MATERIALS
A 182 Gr. F310H A 312 Gr. TP310H A 358 Gr. 310H A 479 Gr. 310s (l)(2)(3)
A 240 Gr. 310s (l)(2)(3) A 351 Gr. CK20 (I)
A 240 Gr. 310H A 479 Gr. 310H

NOTES:
(1) At temperatures over lOOO”F, use only when the carbon content is 0.04% or higher.
(2) For temperatures above lOOO”F, use only if the material is solution heat treated to the minimum
temperature specified in the material specification but not lower than 1900°F and quenching
in water or rapidly cooling by other means.
(3) Service temperatures of 1050°F and above should be used only when assurance is provided
that grain size is not finer than ASTM 6.

TABLE 2-2.7B SPECIAL CLASS

l- Working Pres: *es by Class1 psi9
Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 270 700 930 1,395 2,095 3,495 5,820 10,480
200 245 640 850 1,275 1,915 3,195 5,320 9,580
300 235 610 810 1,215 1,825 3,045 5,070 9,130
400 225 590 790 1,185 1,775 2,955 4,930 8,870
500 215 565 755 1,130 1,695 2,825 4,710 8,480

600 205 535 715 1,070 1,605 2,680 4,465 8,035

650 200 520 695 1,045 1,565 2,610 4,355 7,835
700 195 510 680 1,020 1,525 2,545 4,240 7,635
750 190 500 670 1,000 1,505 2,505 4,175 7,515
800 185 490 650 975 1,465 2,440 4,065 7,315

850 180 475 635 950 1,425 2,380 3,965 7,135

900 180 465 620 930 1,400 2,330 3,885 6,990
950 175 455 605 910 1,365 2,270 3,785 6,815
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,100 3,500 6,300

1100 125 325 435 650 975 1,630 2,715 4,885

1150 90 235 315 470 705 1,180 1,965 3,535
1200 65 170 230 345 515 855 1,430 2,570
1250 50 130 170 255 385 645 1,070 1,930
1300 35 95 125 190 285 470 785 1,415

1350 30 75 95 145 220 365 605 1,095

1400 20 55 75 110 165 280 465 835
1450 15 40 55 85 125 210 345 625
1500 10 30 45 65 95 160 270 480

65
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-2.8
RATINGS FOR GROUP 2.8 MATERIALS
A 182 Gr. F44 A 182 Gr. F53 (1) A 240 Gr. S31254 A 351 Gr. CK3MCuN
A 182 Gr. F51 (1) A 240 Gr. S31803 (1) A 240 Gr. S32750 (1)
A 479 Gr. S31254 A479 Gr. S31803 (1) A 479 Gr. S32750 (1)
A 312 Gr. S31254 A 789 Gr. S31803 (1) A 789 Gr. S32750 (1)
A 358 Gr. S31254 A790 Gr. S31803 (1) A 790 Gr. S52750 (1)

NOTE:
(1) This steel may become brittle after service at moderately elevated temperatures. Not to be
used over 600°F.

TABLE 2-2.8A STANDARD CLASS

Working Pressures by Classs psi9
Temperature, F
‘ 150 460 600 900 1500 2566 1 4500

-20 to 100 290 750 3,750 6,250 11,250

200 260 720 3,600 6,000 10,800
300 230 665 3,325 5,540 9,970
400 200 615 3,070 5,120 9,215
500 170 575 2,880 4,800 8,640

600 140 555 2,785 4,640 8,350

650 125 550 2,750 4,580 8,245
700 110 540 2,710 4,520 8,135
750 95 530 2,660 4,430 7,970

TABLE 2-2.8B SPECIAL CLASS

I Working Pressures by Classes, psig

Temperature, “F 150 I 300 I 400 600 900 I 1500 2500 1 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750

200 290 750 1,000 1,500 2,250 3,750
300 285 740 990 1,485 2,225 3,710
400 265 685 915 1,370 2,055 3,430
500 245 645 855 1,285 1,930 3,215

600 240 620 830 1,245 1,865 3,105

650 235 615 820 1,225 1,840 3,065
700 230 605 805 1,210 1,815 3,025
750 230 595 795 1,195 1,790 2,985

66
VALVES - FLANGED
THREADED, AND WELDING END ASME B16.34-1996

TABLE 2-3.1
RATINGS FOR GROUP 3.1 MATERIALS
A 351 Gr. CN7M (2)(3) B 463 Gr. NO8020 (1) B 468 Gr. NO8020 (1) B 473 Gr. NO8020 (1)
B 462 Gr. NO8020 (1) B 464 Gr. NO8020 (I)

NOTES:
(1) Use annealed material only.
(2) Use solution annealed material only.
(3) Ratings apply for 300°F and lower.

TABLE 2-3.1A STANDARD CLASS

Working Pressures by Classe Psi9
Temperature,"F 1 150 300 400 600 900 1500 2500 1 4500
I I
-2oto 100 230 600 800 1,200 1,800 3,000 5,000 9,000
200 200 520 695 1,045 1,565 2,610 4,350 7,830
300 190 490 655 980 1,470 2,450 4,080 7,345
400 190 490 655 980 1,470 2,450 4,080 7,345
500 170 490 655 980 1,470 2,450 4,080 7,345

600 140 490 655 980 1,470 2,450 4,080 7,345

650 125 490 655 980 1,470 2,450 4,080 7,345
700 110 490 655 980 1,470 2,450 4,080 7,345
750 95 490 655 980 1,470 2,450 4,080 7,345
800 80 490 655 980 1,470 2,450 4,080 7,345
L

TABLE 2-3.18 SPECIAL CLASS

Working Pressures by Classes, psig

Temperature,"F 1 150 I 300 400 1 600 go0 1500 1 2500 1 4500

I I I I I
-20 to 100 255 670 890 1,335 2,005 3,345 5,570 10,030
200 225 585 775 1,165 1,750 2,915 4,855 8,740
300 210 545 730 1,095 1,640 2,730 4,555 8,195
400 210 545 730 1,095 1,640 2,730 4,555 8,195
500 210 545 730 1,095 1,640 2,730 4,555 8,195

600 210 545 730 1,095 1,640 2,730 4,555 8,195

650 210 545 730 1,095 1,640 2,730 4,555 8,195
700 210 545 730 1,095 1,640 2,730 4,555 8,195
750 210 545 730 1,095 1,640 2,730 4,555 8,195
800 1 210 1 545 730 1,095 1,640 2,730 4,555 8,195

67
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-3.2
RATINGS FOR GROUP 3.2 MATERIALS
B 160 Gr. NO2200 (l)(2) B 161 Gr. NO2200 (I) B 162 Gr. NO2200 (I) B 163 Gr. NO2200 (1)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
8564.

TABLE 2-3.2A STANDARD CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 140 360 460 720 1,060 1,600 3,000 5,400
200 140 360 460 720 1,060 1,600 3,000 5,400
300 140 360 460 720 1,060 1,600 3,000 5,400
400 140 360 460 720 1,060 1,600 3,000 5,400
500 140 360 460 720 1,060 1,600 3,000 5,400

600 140 360 460 720 1,060 1,600 3,000 5,400

TABLE 2-3.2B SPECIAL CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4600

-20 to 100 155 400 535 605 1,205 2,010 3,350 6,025
200 155 400 535 605 1,205 2,010 3,350 6,025
300 155 400 535 605 1,205 2,010 3,350 6,025
400 155 400 535 605 1,205 2,010 3,350 6,025
500 155 400 535 605 1,205 2,010 3,350 6,025

600 155 400 535 605 1,205 2,010 3,350 6,025

68
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-3.3
RATINGS FOR GROUP 3.3 MATERIALS
B 160 Gr. NO2201 (l)(2) B 162 Gr. NO2201 (1)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.3A STANDARD CLASS

-r Working Pressures bv Class psi9
Temperature, “F 150 380 400 600 900 1500 2500 4500

-20 to 100 90 240 320 480 720 1,200 2,000 3,600

200 85 230 305 455 685 1,140 1,900 3,420
300 85 225 300 445 670 1,115 1,860 3,350
400 85 215 290 430 650 1,080 1,800 3,240
500 85 215 290 430 650 1,080 1,800 3,240

600 85 215 290 430 650 1,080 1,800 3,240

650 85 215 290 430 650 1,080 1,800 3,240
700 85 215 290 430 650 1,080 1,800 3,240
750 80 210 280 420 635 1,055 1,760 3,170
600 80 205 270 410 610 1,020 1,700 3,060

850 65 205 270 410 610 1,020 1,700 3,060

900 50 140 185 280 415 695 1,155 2,085
950 35 115 150 230 345 570 950 1,715
1000 20 95 125 185 280 465 770 1,390
1050 20(l) 75 100 150 220 370 615 1,100

1100 20(l) 60 80 125 185 310 515 925

1150 20(l) 45 60 95 140 230 385 695
1200 15(l) 35 50 75 110 185 310 555

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

69
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-3.3 (CONT’D)

RATINGS FOR GROUP 3.3 MATERIALS
B 160 Gr. NO2201 (l)(2) B 162 Gr. NO2201 (1)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.38 SPECIAL CLASS

r Workina Pressures bv Classes, usia

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 105 270 355 535 805 1,340 2,230 4,020
200 100 255 340 510 765 1,270 2,120 3,815
300 95 250 330 500 745 1,245 2,075 3,735
400 90 240 320 480 725 1,205 2,010 3,615
500 90 240 320 480 725 1,205 2,010 3,615

600 90 240 320 480 725 1,205 2,010 3,615

650 90 240 320 480 725 1,205 2,010 3,615
700 90 240 320 485 725 1,205 2,010 3,615
750 90 235 315 470 705 1,180 1,965 3,535
800 85 230 305 455 685 1,140 1,895 3,415

850 85 230 305 455 685 1,140 1,895 3,415

900 70 180 240 360 540 905 1,505 2,710
950 55 150 200 295 445 745 1,240 2,230
1000 45 120 160 240 360 605 1,005 1,810
1050 35 95 130 195 290 480 805 1,445

1100 30 80 105 160 240 400 670 1,205

1150 25 60 80 120 180 300 500 905
1200 20 50 65 95 145 240 400 725

70
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-3.4
RATINGS FOR GROUP 3.4 MATERIALS
B 127 Gr. NO4400 (1) B 164 Gr. NO4400 (I) B 165 Gr. NO4400 (1) B 564 Gr. NO4400 (1)
B 163 Gr. NO4400 (I) B 164 Gr. NO4405 (l)(2)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.4A STANDARD CLASS

Working Pressures by Classes, psig

Temperature,"F 150 300 499 699 900 1500 2500 4509

-2oto 100 230 600 800 1,200 1,800 3,000 5,000 9,000
200 200 530 705 1,055 1,585 2,640 4,400 7,920
300 190 495 660 990 1,485 2,470 4,120 7,415
400 185 480 635 955 1,435 2,390 3,980 7,165
500 170 475 635 950 1,436 2,375 3,960 7,130

600 140 475 635 950 1,435 2,375 3,960 7,130

650 125 475 635 950 1,435 2,375 3,960 7,130
700 110 475 635 950 1,435 2,375 3,960 7,130
750 95 470 625 935 1,405 2,340 3,900 7,020
800 80 460 610 915 1,375 2,290 3,820 6,675

850 65 340 455 680 1,020 1,695 2,830 5,090

900 50 245 330 495 740 1,235 2,055 3,705

TABLE 2-3.4B SPECIAL CLASS

l- L
Working Pressures bv Classes, psig

Temperature,'F 150 300 600 900 2500 4500

-2oto 100 255 670 895 1,340 2,010 3,350 5,580 10,045
200 225 590 785 1,180 1,770 2,945 4,910 8,840
300 210 550 735 1,100 1,650 2,755 4,590 8,260
400 205 535 710 1,065 1,600 2,665 4,440 7,995
500 205 530 710 1,060 1,590 2,650 4,420 7,955

600 205 530 710 1,060 1,590 2,650 4,420 7,955

850 205 530 710 1,060 1,590 2,650 4,420 7,955
700 205 530 710 1,060 1,590 2,650 4,420 7,955
750 200 520 695 1,045 1,565 2,610 4,355 7,835
800 195 510 680 1,025 1,535 2,560 4,265 7,675

850 170 440 590 885 1,325 2,210 3,685 6,630

900 125 320 430 645 965 1,605 2,680 4,820
L

71
 VALVES-FLANGED,
ASME 816.34-1996 THREADED,ANDWELDlNG END

TABLE 2-3.5
RATINGS FOR GROUP 3.5 MATERIALS
B 163 Gr. NO6600(1) B 167 Gr.N06600(1) B 166Gr.NO6600 (I) B564 Gr.N06600(1)
B 166 Gr.NO6600 (1)

NOTE:
(I) Use annealed material only.

TABLE 2-3.5A STANDARD CLASS

I Working Pressures bv Classes Psi9
Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,165 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,660 10,565
500 170 665 665 1,330 1,995 3,325 5,540 9,965

600 140 605 605 1,210 1,615 3,025 5,040 9,070

650 125 590 765 1,175 1,765 2,940 4,905 6,625
700 110 570 755 1,135 1,705 2,640 4,730 6,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
600 60 510 675 1,015 1,525 2,540 4,230 7,610

650 65 465 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 325 435 655 960 1,635 2,725 4,905
1000 20 215 290 430 650 1,060 1,600 3,240
1050 20(l) 140 165 260 415 695 1,155 2,085

1100 20(l) 95 125 165 260 465 770 1,390

1150 20(l) 70 90 135 205 340 565 1,070
1200 20(l) 60 60 125 165 310 515 925

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

TABLE 2-3.5B SPECIAL CLASS

Working Pressures by Classes, psig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 285 745 995 1,495 2,240 3,735 6,230 11,210

650 280 735 980 1,470 2,200 3,670 6,115 11,010
700 275 725 965 1,445 2,170 3,615 6,025 10,850
750 270 710 945 1,420 2,130 3,550 5,915 10,645
600 270 700 930 1,400 2,095 3,495 5,825 10,485

650 260 680 905 1,355 2,030 3,385 5,645 10,160

900 230 600 800 1,200 1,800 3,000 5,000 9,000
950 165 425 570 850 1,280 2,130 3,550 6,390
1000 110 280 375 565 845 1,405 2,345 4,220
1050 70 180 240 360 540 905 1,505 2,710

1100 45 120 160 240 360 605 1,005 1,810

1150 35 90 120 175 265 440 735 1,325
1200 30 80 105 160 240 400 670 1,205

72
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-3.7
RATINGS FOR GROUP 3.7 MATERIALS
B 333 Gr. N10665 (1) B 335 Gr. N10665 (l)(2) B 622 Gr. N10665 (1)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
8564.

TABLE 2-3.7A STANDARD CLASS

T Working Pressures by Classe Psi9
Temperature, “F 150 1500 4600

-20 to 100 290 750 1,000 2,250 3,750 6,250 11,250

200 260 750 1,000 2,250 3,750 6,250 11,250
300 230 730 970 2,185 3,640 6,070 10,925
400 200 705 940 2,115 3,530 5,880 10,585
500 170 665 885 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
600 80 510 675 1,015 1.525 2,540 4,230 7,610

TABLE 2-3.78 SPECIAL CLASS

Working Pressures by Classes, psig
Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 290 750 1,000 1,500 2,250 3,750 6,250 11,250
500 290 750 1,000 1,500 2,250 3,750 6,250 11,250

600 290 750 1,000 1,500 2,250 3,750 6,250 11,250

650 290 750 1,000 1,500 2,250 3,750 6,250 11,250
700 280 735 980 1,465 2,200 3,655 6,110 10,995
750 280 730 970 1,460 2,185 3,645 6,070 10,930
800 275 720 960 1,440 2,160 3,600 6,000 10,800

75
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-3.8
RATINGS FOR GROUP 3.8 MATERIALS
6 333 Gr. NlOOOl (l)(6) B 434 Gr. N10003 (3) B 564 Gr. N10276 (l)(4) B 575 Gr. N10276 (l)(4)
B 335 Gr. NlOOOl (l)(2)(6) B 443 Gr. NO6625 (3){5) I3 573 Gr. N10003 (2)(3) B 622 Gr. NO6455 (l)(6)
B 423 Gr. NO8825 (3)(7) B 446 Gr. NO6625 (3)(5) B 574 Gr. NO6455 (l)(2)(6) B 822 Gr. NlOOOl (3)(6)
B 424 Gr. NO8825 (3)(7) B 564 Gr. NO6625 (3)(5) B 574 Gr. N10276 (l)(2)(4) B 622 Gr. N10276 (l)(4)
B 425 Gr. NO8825 (2)(3)(7) B 564 Gr. NO8825 (3)(7) B 575 Gr. NO6455 (l)(6)

NOTES:
(I) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and grain
size requirements shall conform to the applicable ASTM specification. The manufacturing procedures,
tolerances, tests, certification, and markings shall be in accordance with ASTM B 564.
(3) Use annealed material only.
(4) Not to be used over 1250°F.
(5) Not to be used over 1200°F. Alloy NO6625 in the annealed condition is subject to severe loss of impact
strength at room temperatures after exposure in the range of 1000°F to 1400°F.
(6) Not to be used over 800°F.
(7) Not to be used over 1000°F.

TABLE 2-3.8A STANDARD CLASS

r Working Pressures by Classer 5, I:rsig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 665 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 875 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 4,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 20(l) 325 430 645 965 1,610 2,685 4,835

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 185 245 370 555 925 1,545 2,775
1250 20(l) 145 195 295 440 735 1,220 2,200
1300 20(l) 110 145 215 325 540 900 1,620

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

76
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-3.9 (CONT’D)

RATINGS FOR GROUP 3.9 MATERIALS
B 435 Gr. NO6002 (I) B 572 Gr. NO6002 (l)(2) B 622 Gr. NO6002 (1)

NOTES:
(1) Use solution annealed material only.
(4 Forforgings,thechemicalcomposition,mechanicalproperties,heattreating requirements,and
grain size requirementsshallconformtotheapplicable ASTM specification.The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.9B SPECIAL CLASS

Working Pressures by Classes, psig
L

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 255 665 890 1,335 2,000 3,325 5,560 10,005
500 245 645 855 1,285 1,930 3,215 5,355 9,645

600 240 625 630 1,250 1,870 3,120 5,200 9,360

650 240 625 830 1,250 1,870 3,120 5,200 9,360
700 240 625 830 1,250 1,870 3,120 5,200 9,360
750 240 625 830 1,250 1,870 3,120 5,200 9,360
600 240 625 830 1,250 1,870 3,120 5,200 9,360

650 225 585 780 1,175 1,760 2,935 4,890 8,800

900 225 585 775 1,165 1,750 2,915 4,855 8,740
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 155 405 540 805 1,210 2,015 3,360 6,045

1150 130 345 460 685 1,030 1,715 2,860 5,145
1200 100 260 345 515 770 1,285 2,145 3,860
1250 90 230 305 455 680 1,135 1,895 3,410
1300 65 170 230 345 515 860 1,430 2,570

1350 50 130 170 260 385 645 1,070 1,930

1400 35 95 125 190 285 470 765 1,415
1450 30 75 100 145 220 365 610 1,095
1500 20 50 70 105 155 260 430 770

79
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-3.10
RATINGS FOR GROUP 3.10 MATERIALS
B 599 Gr. NO6700 (1) B 672 Gr. NO6700 (l)(2)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.1OA STANDARD CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,160 3,600 6,000 10,600
200 260 720 960 1,440 2,160 3,600 6,000 10,600
300 230 680 905 1,360 2,040 3,400 5,670 10,205
400 200 640 855 1,280 1,920 3,205 5,340 9,610
500 170 610 815 1,225 1,835 3,060 5,100 9,180

600 140 595 790 1,190 1,780 2,970 4,950 8,910

650 125 570 760 1,140 1,705 2,845 4,740 6,530

TABLE 2-3.108 SPECIAL CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 460 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 290 750 1,000 1,500 2,250 3,750 6,250 11,250
300 290 750 1,000 1,500 2,250 3,750 6,250 11,250
400 275 715 955 1,430 2,145 3,575 5,960 10,730
500 260 685 910 1,365 2,050 3,415 5,690 10,245

600 255 665 885 1,325 1,990 3,315 5,525 9,945

650 245 635 845 1,270 1,905 3,175 5,290 9,520

80
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

TABLE 2-3.11
RATINGS FOR GROUP 3.11 MATERIALS
B 625 Gr. NO8904 (1) B 649 Gr. NO8904 (l)(2) B 677 Gr. NO8904 (1)

NOTES:
(1) Use annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.11A STANDARD CLASS

Working Pressures by Classes, psig

Temperature, “F 150 400 600 900 1500 2500 4500

I
-20 to 100 245 640 855 1,280 1,920 3,205 5,340 9,610
200 230 600 800 1,200 1,805 3,005 5,010 9,020
300 210 645 725 1,085 1,630 2,720 4,530 8,155
400 190 495 660 995 1,490 2,485 4,140 7,450
500 170 455 610 915 1,370 2,285 3,810 6,860

600 140 430 575 865 1,295 2,160 3,600 6,480

650 125 420 560 840 1,265 2,105 3,510 6,320
700 110 410 545 820 1,230 2,050 3,420 6,155
L

TABLE 2-3.11B SPECIAL CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2600 4596

-20 to 100 275 715 955 1,430 2,145 3,575 5,960 10,730
200 255 670 895 1,340 2,015 3,355 5,590 10,065
300 235 605 810 1,215 1,820 3,035 5,055 9,100
400 215 555 740 1,110 1,665 2,770 4,620 8,315
500 195 510 680 1,020 1,530 2,550 4,250 7,655

600 185 480 645 965 1,445 2,410 4,020 7,230

650 180 470 625 940 1,410 2,350 3,915 7,050
700 170 460 610 915 1.375 2,290 3,815 6,870

81
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

TABLE 2-3.12
RATINGS FOR GROUP 3.12 MATERIALS
B 561 Gr. NO6965 (l)(2) B 582 Gr. NO6985 (1) B 620 Gr. NO8320 (I) B 621 Gr. NO8320 (l)(2)
B 622 Gr. NO6985 (1) B 622 Gr. NO8320 (1)

NOTES:
(1) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.12A STANDARD CLASS

r Working Pressures by Classces,
, psi9
Temperature, “F 150 300 460 600 900 1500 4500

-20 to 100 260 670 895 1,345 2,015 3,360 5,600 10,080
200 240 625 830 1,245 1,870 3,115 5,190 9,340
300 225 585 780 1,175 1,760 2,935 4,890 8,600
400 200 535 715 1,075 1,610 2,680 4,470 8,045
500 170 500 665 1,000 1,500 2,500 4,170 7,505

600 140 475 635 950 1,425 2,375 3,960 7,130

650 125 465 620 930 1,395 2,320 3,870 6,965
700 110 450 600 900 1,350 2,250 3,750 6,750
750
800
95
60
445
430
590
575
1 885
865
1,330
1,295
2,215
2,160
3,690
3,600
6,640
6,480

TABLE 2-3.12B SPECIAL CLASS

Working Pressures by Classes, psig

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 265 695 925 1,390 2,085 3,475 5,790 10,425
300 250 655 875 1,310 1,965 3,275 5,460 9,825
400 230 800 800 1,195 1,795 2,995 4,990 8,980
500 215 560 745 1,115 1,675 2,790 4,655 6,375

600 205 530 705 1,060 1,590 2,650 4,420 7,955

650 200 520 690 1,035 1,555 2,590 4,320 7,775
700 195 500 670 1,005 1,505 2,510 4,185 7,535
750 190 495 660 990 1,485 2,470 4,120 7,415
800 185 480 645 965 1,445 2,410 4,020 7,230

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TABLE 2-3.15
RATINGS FOR GROUP 3.15 MATERIALS
B407 Gr. N06610(1) B 408 Gr.N08810(1) B409Gr.N08810(1) B 564Gr.NO8810 (1)
A494 Gr. N-lZMV(1)(2) A 494 Gr. CW-12MW (l)(2)

NOTES:
(1) Use solution annealed material only.
(2) Not to be used over 1000°F.

TABLE 2-3.15A STANDARD CLASS

T Working Pressures by Classes .I: Bsig

Temperature,"F 150 300 400 600 900 1500 2500 4500

-2oto 100 230 600 800 1,200 1,800 3,000 5,000 9,000
200 205 540 720 1,080 1,620 2,700 4,500 8,100
300 195 505 675 1,015 1,520 2,530 4,220 7,595
400 185 480 640 960 1,440 2,400 4,000 7,200
500 170 455 610 910 1,370 2,280 3,800 6,840

600 140 440 585 880 1,320 2,195 3,660 6,590

650 125 425 565 850 1,275 2,125 3,540 6,370
700 110 420 560 840 1,260 2,100 3,500 6,300
750 95 415 550 825 1,240 2,065 3,440 6,190
800 80 410 545 815 1,225 2,040 3,400 6,120

850 65 400 530 795 1,195 1,990 3,320 5,975

900 50 395 530 790 1,190 1,980 3,300 5,940
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 325 435 650 975 1,625 2,710 4,875

1100 20(l) 320 430 640 965 1,605 2,675 4,815

1150 20(l) 275 365 550 825 1,370 2,265 4,115
1200 20(l) 205 275 410 620 1,030 1,715 3,085
1250 20(l) 180 245 365 545 910 1,515 2,725
1300 20(l) 140 185 275 410 685 1,145 2,060

1350 20(l) 105 140 205 310 515 660 1,545

1400 20(l) 75 100 150 225 380 630 1,130
1450 20(l) 60 80 115 175 290 485 875
1500 20(l) 40 55 85 125 205 345 620

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

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TABLE 2-3.15 (CONT’D)

RATINGS FOR GROUP 3.15 MATERIALS
B 407 Gr.NO8810 (1) B 408 Gr. N08810(1) B409 Gr.N08810(1) B 564Gr.N08810(1)
A494 Gr. N-lPMV(1)(2) A 494 Gr. CW-12MW (l)(2)

NOTES:
(1) Use solution annealed material only.
(2) Not to be used over 1000°F.

TABLE 2-3.158 SPECIAL CLASS

l- 'orking Pres! -es by Class Psi9
Temperature, “F 150 300 400 600 900 1500 2500 4500

-2oto 100 255 670 895 1,340 2,010 3,350 5,580 10,045
200 230 605 805 1,205 1,810 3,015 5,020 9,040
300 215 565 755 1,130 1,695 2,825 4,710 8,480
400 205 535 715 1,070 1,605 2,680 4,465 8,035
500 195 510 680 1,020 1,525 2,545 4,240 7,635

600 190 490 655 980 1,470 2,450 4,085 7,355

650 180 475 630 950 1,420 2,370 3,950 7,110
700 180 470 625 940 1,405 2,345 3,905 7,030
750 175 460 615 920 1,380 2,305 3,840 6,910
800 175 455 605 910 1,365 2,275 3,795 6,830

850 170 445 595 890 1,335 2,225 3,705 6,670

900 170 440 590 885 1,325 2,210 3,685 6,630
950 165 435 580 870 1,300 2,170 3,615 8,510
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 160 420 560 840 1,260 2,105 3,505 6,310

1100 155 405 540 805 1,210 2,015 3,360 6,045

1150 130 345 480 685 1,030 1,715 2,860 5,145
1200 100 260 345 515 770 1,285 2,145 3,860
1250 90 230 305 455 680 1,135 1,865 3,410
1300 85 170 230 345 515 860 1,430 2,570

1350 50 130 170 260 385 645 1,070 1,930

1400 35 95 125 190 285 470 785 1,415
1450 30 75 100 145 220 365 610 1,095
1500 20 50 70 105 155 260 430 770

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TABLE 2-3.16
RATINGS FOR GROUP 3.16 MATERIALS
B 511 Gr. NO8330 (l)(2) B 535 Gr.N08330(1) B 536Gr.N08330(1)

NOTES:
(1) Use solution annealed material only.
(2) Forforgings,the chemicalcomposition,mechanicalpropetties, heattreating requirements,and
grain size requirements shallconformtothe applicableASTM specification.The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.16A STANDARD CLASS

l- Working Pressures bv Classe:5. psi9

Temperature, “F 150 300 400 600 900 1500 2500 4500

-20 to 100 275 720 960 1,440 2,160 3,600 6,000 10,800
200 245 635 850 1,270 1,910 3,180 5,300 9,540
300 225 590 785 1,175 1,765 2,940 4,900 8,820
400 200 550 735 1,105 1,655 2,760 4,600 8,280
500 170 525 700 1,050 1,575 2,630 4,380 7,885

600 140 500 670 1,005 1,505 2,510 4,180 7,525

650 125 490 655 980 1,470 2,450 4,080 7,345
700 110 480 645 965 1,445 2,410 4,020 7,235
750 95 470 625 940 1,410 2,350 3,920 7,055
800 80 465 620 925 1,390 2,315 3,860 6,950

850 65 455 605 905 1,360 2,270 3,780 6,805

900 50 445 590 885 1,330 2,215 3,690 6,640
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 310 410 615 925 1,545 2,570 4,630

1100 20(l) 240 320 480 720 1,205 2,005 3,610

1150 20(l) 185 245 370 555 925 2,545 2,775
1200 20(l) 145 195 290 435 725 1,210 2,175
1250 20(l) 115 155 235 350 585 975 1,760
1300 20(l) 95 130 190 285 480 795 1,435

1350 20(l) 75 100 150 220 370 615 1,110

1400 20(l) 55 75 110 165 280 465 835
1450 20(l) 45 60 95 140 230 385 695
1500 1511) 35 45 70 100 170 285 510

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

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TABLE 2-3.16 (CONT’D)

RATINGS FOR GROUP 3.16 MATERIALS
B 511 Gr. NO6330 (l)(2) B 535 Gr. NO6330 (1) B 536 Gr. NO8330 (1)

NOTES:
(I) Use solution annealed material only.
(2) For forgings, the chemical composition, mechanical properties, heat treating requirements, and
grain size requirements shall conform to the applicable ASTM specification. The manufacturing
procedures, tolerances, tests, certification, and markings shall be in accordance with ASTM
B 564.

TABLE 2-3.168 SPECIAL CLASS

r Working Pressures by Classes, psig

Temperature, ‘F 150 300 400 600 900 1560 2500 4600

-20 to 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 270 710 945 1,420 2,130 3,550 5,915 10,645
300 250 655 875 1,315 1,970 3,280 5,470 9,845
400 235 615 820 1,230 1,850 3,080 5,135 9,240
500 225 585 780 1,175 1,760 2,935 4,890 8,800

600 215 560 745 1,120 1,680 2,800 4,665 8,395

650 210 545 730 1,095 1,640 2,730 4,555 8,195
700 205 540 720 1,075 1,615 2,690 4,485 8,075
750 200 525 700 1,050 1,575 2,625 4,375 7,875
800 200 515 690 1,035 1,550 2,585 4,310 7,755

850 195 505 675 1,015 1,520 2,530 4,220 7,595

900 190 495 660 990 1,485 2,470 4,120 7,415
950 180 470 630 945 1,415 2,360 3,930 7,070
1000 160 420 560 840 1,260 2,105 3,505 6,310
1050 155 400 535 805 1,205 2,010 3,350 6,025

1100 120 315 420 825 940 1,565 2,610 4,700

1150 90 240 320 480 725 1,205 2,010 3,615
1200 70 190 250 380 565 945 1,575 2,835
1250 60 155 205 305 460 765 1,270 2,290
1300 50 125 165 250 375 625 1,040 1,870

1350 35 95 130 195 290 480 805 1,445

1400 30 70 95 145 215 360 605 1,085
1450 25 60 80 120 180 300 500 905
1500 15 45 60 90 135 220 370 665

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VALVES-FLANGED
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TABLE 3 VALVE BODY MINIMUM WALL THICKNESS t,. in. ICONT’D)

r Class

Inside
Diameter&in.
[Note WI 150 300 400 600 900 1500 2500 4500

24.00 0.58 0.97 1.24 1.72 2.61 4.53 8.28 18.94

24.25 0.58 0.98 1.26 1.74 2.64 4.57 8.37 19.13
24.62 0.59 0.99 1.27 1.77 2.67 4.64 8.49 19.43
25.00 0.59 1.00 1.28 1.79 2.71 4.71 6.62 19.97
25.25 0.60 1.01 1.29 1.81 2.74 4.76 8.71 19.92

25.50 0.61 1.02 1.30 1.82 2.76 4.60 6.79 20.11

26.00 0.61 1.04 1.32 1.85 2.82 4.90 6.96 20.51
26.25 0.62 1.05 1.33 1.88 2.84 4.94 9.05 20.70
26.37 0.62 1.05 1.34 1.89 2.86 4.96 9.09 20.80
27.00 0.62 1.07 1.36 1.93 2.92 5.08 9.30 21.29

27.25 0.62 1.08 1.37 1.95 2.95 5.13 9.39 21.49

27.37 0.63 1.08 1.37 1.96 2.96 5.15 9.43 21.59
28.00 0.64 1.10 1.39 2.00 3.03 5.26 9.65 22.08
28.25 0.65 1.11 1.40 2.01 3.05 5.31 9.73 22.27
29.00 0.66 1.14 1.43 2.07 3.13 5.45 9.99 22.86

29.25 0.66 1.14 1.44 2.08 3.16 5.49 10.07 23.06

30.00 0.67 1.17 1.47 2.13 3.23 5.63 10.33 23.65
31.00 0.69 1.20 1.51 2.20 3.34 5.82 10.67 24.43
32.00 0.71 1.23 1.54 2.27 3.44 6.00 11.01 25.22
33.00 0.72 1.27 1.58 2.34 3.55 6.19 11.35 26.00

34.00 0.74 1.30 1.62 2.40 3.65 6.37 11.69 26.79

35.00 0.75 1.33 1.65 2.47 3.76 6.55 12.03 27.57
36.00 0.77 1.37 1.69 2.54 3.86 6.74 12.37 28.36
37.00 0.79 1.40 1.73 2.61 3.97 6.92 12.71 29.14
38.00 0.80 1.43 1.79 2.68 4.07 7.11 13.05 29.93

39.00 0.62 1.47 1.83 2.74 4.18 7.29 13.40 30.71

40.00 0.84 1.50 1.68 2.61 4.28 7.48 13.74 31.50
41.00 0.85 1.53 1.92 2.88 4.38 7.66 14.08 32.26
42.00 0.87 1.56 1.96 2.95 4.49 7.65 14.42 33.07
43.00 0.88 1.60 2.01 3.01 4.59 8.03 14.76 33.65

44.00 0.90 1.63 2.05 3.08 4.70 8.21 15.10 34.63

45.00 0.92 1.66 2.10 3.15 4.80 8.40 15.44 35.42
46.00 0.93 1.70 2.14 3.22 4.91 8.58 15.78 36.20
47.00 0.95 1.73 2.19 3.29 5.01 8.77 16.12 36.99
46.00 0.97 1.76 2.23 3.35 5.12 8.95 16.46 37.77

49.00 0.98 1.80 2.27 3.42 5.22 9.14 16.60 36.56

50.00 1.00 1.83 2.32 3.49 5.32 9.32 17.15 39.34

NOTE:
(1) See para. 6.1.2.

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TABLE 4 MIMINUM WALL THICKNESS FOR SOCKET WELDING AND

THREADED ENDS
Wall Thickness C, in.

? Pressure Rating Class Designation

50 400
Size thrOUgh through 800
NPS 300 600 [Note WI 900 2500 4500

0.12 0.12 0.12 0.14 0.14 0.21 0.22

0.12 0.13 0.13 0.16 0.16 0.26 0.29
0.12 0.14 0.14 0.17 0.17 0.26 0.37
0.13 0.16 0.16 0.21 0.21 0.32 0.44
0.14 0.17 0.17 0.24 0.24 0.34 0.51

0.15 0.20 0.20 0.27 0.27 0.39 0.62

0.15 0.21 0.21 0.28 0.32 0.46 0.75
0.16 0.22 0.23 0.31 0.35 0.51 0.84
0.16 0.24 0.27 0.38 0.42 0.62 1.02
0.22 0.30 0.31 0.41 0.49 0.73 1.22

NOTE:
(I) Class 800 is not a normally tabulated ASME 816.34 designation, but it is an intermediate class
that is widely used for socket welding and threaded end valves.

92
 ANNEX A
RELATIONSHIP BETWEEN NOMINAL PIPE SIZE AND INSIDE DIAMETER

(ThisAnnex is a nonmandatory part of ASME 816.34-1996 and is provided for information purposes only.)

The relationshipbetween wall thicknessand inside designbasisfor the corresponding flangedend valves,
diameter shown in Table 3 is the basis for pressure subsequentlyextendedin applicationto welding end
rating of valves. By interpolation,a definitive design valves, which in many casesare identical except for
basis can be determinedfor any pressure-diameter- the pipe ends. Table Al is basedon the dimensions
material combination. given in B16.5 dimensionaltablesas “Inside Diameter
Following the evolution of standarddimensionsfor of Fitting”. The Valves above nominal pipe size 24
flanges in a series of rating classes,corresponding for the lower pressureclassesand above nominalpipe
standardrelationshipswere establishedbetweennominal size 12 for Class2500 are obtainedby linear extrapo-
pipe sizesand the insidediameterof fittingsmatching lation.
the ratingclassof the flanges.These provideda useful

TABLE Al INSIDE DIAMETER d, in.

r Class

Nominal
Pipe Size 150 300 400 600 900 1600 2500

'/2 0.50 0.50 0.50 0.50 0.50 0.50 0.44

%I 0.75 0.75 0.75 0.75 0.69 0.69 0.56
1 1.00 1.00 1.00 1.00 0.67 0.87 0.75
11/d 1.25 1.25 1.25 1.25 1.12 1.12 1.00
1'/2 1.50 1.50 1.50 1.50 1.37 1.37 1.12

2 2.00 2.00 2.00 2.00 1.67 1.87 1.50

2'4 2.50 2.50 2.50 2.50 2.25 2.25 1.87
3 3.00 3.00 3.00 3.00 2.67 2.75 2.25
4 4.00 4.00 4.00 4.00 3.67 3.62 2.87
5 5.00 5.00 5.00 5.00 4.75 4.37 3.62

6 6.00 6.00 6.00 6.00 5.75 5.37 4.37

6 6.00 6.00 6.00 7.67 7.50 7.00 5.75
10 10.00 10.00 10.00 9.75 9.37 8.75 7.25
12 12.00 12.00 12.00 11.75 11.12 10.37 8.62
14 13.25 13.25 13.12 12.67 12.25 11.37 9.50

16 15.25 15.25 15.00 14.75 14.00 13.00 10.87

16 17.25 17.00 17.00 16.50 15.75 14.62 12.25
20 19.25 19.00 16.67 16.25 17.50 16.37 13.50
22 21.25 21.00 20.75 20.12 19.25 18.00 14.87
24 23.25 23.00 22.62 22.00 21.00 19.62 16.25

26 25.25 25.00 24.50 23.75 22.75 21.25 17.62

26 27.25 27.00 26.37 25.50 24.50 23.00 19.00
30 29.25 29.00 26.25 27.37 26.25 24.62 20.37

93
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX F
METHODS FOR ESTABLISHING PRESSURE-TEMPERATURE RATINGS

(This Annex is an integral part of ASME 816.34-1996 and is placed after the main text for convenience.)

Fl GENERAL CONSIDERATIONS The equation does not apply for values of PC greater
than 4,500.
Fl .l Introduction
F1.4 Additional Considerations
Pressure-temperature ratings for this Standard have
been determined by the procedures described in this The equation in para. F1.3 results in a wall thickness
Annex. The method is general and considers dimensions of 50% greater for Class 150 to 2500 and approximately
of this and related standards. Valve performance is 35% greater for Class 4500 than for a simple cylinder
related to stressand deformation. Valves require special designed for a stressof 7000 psi subjected to an internal
consideration since they are mechanically operated de- pressure equal to the pressure rating class designation.
vices that must be able to provide partial or complete The actual values in Table 3 are approximately 0.1 in.
restriction to fluid flow under a wide variety of condi- heavier than those given by the equation. Additional
tions. metal thickness, particularly for ratings over Class
2500, needed for assembly stress,valve closing stresses,
F1.2 Materials shapes other than circular, and stress concentrations
must be determined by individual manufacturers, since
It is not required that identical materials be used for these factors vary widely.
a valve body and bonnet or a valve body and cover.
The assigned pressure rating shall be based on the F1.5 Material Properties
valve body. The bonnet or cover shall be designed and
the material selected accordingly. Selection of stems, The pressure-temperature rating method uses allow-
discs, and other parts, such as bonnet gaskets and able stressesand yield strengths from reference ASME
bolting, subject to pressure and other loading, shall be Boiler and PressureVessel Code Sections. For materials
consistent with the pressure-temperature rating. listed herein which have temperature tabulations above
those listed or are not listed at all, allowable stresses
and yield strength data have been provided directly by
F1.3 Wall Thickness the ASME Boiler and Pressure Vessel Subcommittee
Wall thickness requirements for valve bodies are on Materials.
specified in para. 6.1. The minimum wall thickness
values shown in Table 3 are all greater than those F1.6 Material Groups
determined by the following equation. Materials are grouped in Table 1 based on identical
or closely matched allowable stress and yield strength
Pcd
I = lS [ 2s - 1.2P, 1 values. When these values are not identical for each
material listed, the lowest value has been used.

where
F2 STANDARD CLASS RATING METHOD
f= calculated thickness, in.
PC = pressure rating class designation or number,
F2.1 Method for Group 1 Materials
psi (e.g., for Class 150, PC = 150 psi; for Class
300, PC = 300 psi) Pressure-temperature ratings for Standard Class
d= inside diameter or port opening as defined in valves, Class 300 and higher, of materials corresponding
para. 6.1.2, in. (see Table 3 and Annex A) to those in Materials Group 1 of Table 1, are established
S = stress factor of 7,000 psi by the equation

103
 VALVES - FLANGED,
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cf) Yield strengthshallbe as listedin ASME Boiler

and PressureVesselCode, SectionII, Part D, for either
SectionIII or SectionVIII, Division 2.
where (g) Allowablestressvaluesas listedin ASME Boiler
PSI = rated working pressure,psi for the specified and PressureVessel Code, Section II, Part D, for
material at temperatureT Section III, Class 2 or Class 3 values only, may be
Pm = ceilingpressure,psi, at temperatureT as speci- used for a material not listed for either Section I or
fied in SectionF4 for StandardClass SectionVIII, Division 1.
P, = pressureratingclassindex,psi.For all designa-
tions Class 300 and above. P, equal to the F2.2 Method for Groups 2 and 3 Materials
classdesignation(e.g., for Class300, P = 300
Pressure-temperatureratings for Standard Class
psi; for Class 150, see para. F2.3 of this
valves,Class300 andhigher,of materialscorresponding
Annex)
to those in Materials Groups2 and 3 of Table 1 are
SI = selectedstress,psi, for the specifiedmaterial
establishedby the methodof para F2.1, exceptthat in
at temperatureT. The value of SI shall be
paras. F2.I(a) and F2.l(a)( l), 60% shall be changed
establishedas follows.
to 70%.
(a) At temperaturesbelow the creep range,SI shall
F2.3 Method for Class 150 - All Materials
be equal to or less than 60% of the yield strengthat
temperatureT, but shall not exceed: Pressure-temperatureratings for Standard Class
(I) 60.0% of the specifiedminimumyield strength valves. Class 150 rating designation,are established
at 100°F: by the methodgiven for the relatedmaterialsin paras.
(2) 1.25 timesthe allowablestressvalueat temper- F2.1 and F2.2, subject to the following additional
ature T, as listed in ASME Boiler and PressureVessel requirements:
Code, SectionII, Part D, for either SectionI or Section P, = 115 psi. For a ratingdesignation
lessthanClass
VIII, Division 1; 300, an interpolationmustbe madeusingP, =
(b) At temperatures in the creeprange,the value of 115 psi for Class 150.
SI shall be the allowable stressat temperatureT, as S1 = selectedstress,psi, for the specificmaterialat
listed in ASME Boiler and PressureVessel Code, temperatureT in accordancewith the require-
SectionII, Part D, for either SectionI or SectionVIII, mentsstatedin either para. F2.1 or F2.2
Division 1, but not exceeding60% of the yield strength ps, = rated working pressure,psi, for temperatures
at temperature. lOOoFand lower, shall not exceed values at
(c) In no caseshallthe selectedstressvalueincrease temperatureT expressedin degreesFahrenheit,
with increasingtemperature. as given by the equation.
(d) The creep is consideredto be at temperatures
in excessof 700°F for Group 1 materialsand 950°F psr= 320 - 0.3T
for Group2 materials,unlessmaterialpropertiesindicate
lower temperatures to be used.For Group 3 materials, For values of temperatureless than lOO”F, use T
the creep rangetemperaturelimits shall be determined equal to 100°F.
on an individual material basis.
(e) When the allowablestresseslisted for the refer-
encedASME Boiler and PressureVesselCode Section F3 SPECIAL CLASS RATING METHOD
show a higher and lower value for allowable stress F3.1 Pressure-temperatureratings for Special Class
and the higher value is noted to the effect that these valves(see2.1.2) areestablished
for all materialsof Table
stressvaluesexceedtwo-thirdsof the yield strengthat 1 by the equation
temperature,then the lower value shall be used. If
lower allowable stressvalues do not appearand it is
noted in the allowable stresstable that the allowable psp
s2
-- -7000 pr5 Pcb
stressvaluesexceedtwo-thirdsof the yield strengthat
temperature,then the allowable stressvalues shall be where
determinedas two-thirdsof the tabulatedyield strength Psp= Special Class rated working pressurefor the
at temperature. specifiedmaterialat temperatureT, psi

104
VALVES - FLANGED
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P cb = ceilingpressure,
psi, at temperatureT as speci- 3 materials,the creep range temperaturelimits shall
fied in para.F4 for SpecialClass be determinedon an individual materialbasis.
P, = pressure ratingclassindex,psi.For all designa- (e) When the allowablestresseslistedfor the refer-
tions Class300 and aboveP,, is equal to the encedASME Boiler and PressureVesselCode Section
classdesignation(e.g, for Class300, P, = 300 show a higher and lower value for allowable stress
and the higher value is noted to the effect that these
psi). For Class150, P, = 115 psi. For a rating
stressvaluesexceedtwo-thirdsof the yield strengthat
designationlessthanClass300, an interpolation
temperature,then the lower value shall be used. If
is requiredusingP, = 115 psi for Class150
lower allowable stressvalues do not appearand it is
s* = selectedstressfor the specifiedmaterialat tem- noted in the allowable stresstable that the allowable
peratureT, psi. The value of S, shallbe estab- stressvaluesexceedtwo-thirdsof the yield strengthat
lishedas follows. temperature,then the allowable stressvalues shall be
determinedas two-thirdsof the tabulatedyield strength
(a) At temperatures below the creep range,S, shall at temperature.
be equal to or less than 62.5% of the yield strength (f) Yield strengthshallbe as listedin ASME Boiler
at temperatureT, but shall not exceed: and PressureVesselCode, SectionII, Part D, for either
(I) 62.5% of the specifiedminimumyield strength SectionIII or SectionVIII, Division 2.
at 100°F; (g) Allowablestressvaluesas listedin ASME Boiler
(2) 1.0 timesthe allowablestressvalueat tempera- and PressureVessel Code, Section II, Part D, for
Section III, Class 2 or Class 3 values only, may be
ture T, as listed in ASME Boiler and PressureVessel
used for a material not listed for either Section I or
Code,SectionII, Part D, for eitherSectionI or Section
SectionVIII, Division 1.
VIII, Division 1.
(b) At temperatures in the creep range,the value of
S2 shall be the allowable stressat temperatureT, as F4 MAXIMUM RATINGS
listed in ASME Boiler and PressureVessel Code, The rulesfor establishing StandardClassand Special
SectionII, Part D, for either SectionI or SectionVIII, Classpressure-temperature ratingsincludeconsideration
Division 1, but shall not exceed 62.5% of the yield of a ceiling pressurethat effectively setslimits on the
strengthat temperatureT. selectedstress.The ceilingpressure-temperature values
(c) In no caseshallthe selectedstressvalueincrease set an upperboundfor high strengthmaterialsand are
with increasingtemperature. imposedto limit deflection.By definition,ceilingvalues
(d) The creep range is to be consideredthat at apply to all intermediateratings(para. 2.1.4). Ceiling
temperatures in excessof 7OO’F for Group 1 materials valuesare listed in Tables F4-A and F4-B. Except for
and950°F for Group2 materials,unlessmaterialproper- Limited Class,ratingsin excessof theseare not permit-
ties indicatelower temperatures to be used.For Group ted under this Standard.

105
 VALVES-FLANGED,
ASME 816.34-1996 THREADED,ANDWELDlNGEND

TABLE F4
PRESSURE RATING CEILING VALUES

TABLE F4-A SPECIAL CLASS VALVES

Working Pressures bv Classe! Bsig
I
Temperature, F
‘ 150 300 400 600 900 1500 2500 4500

-2oto 100 290 750 1,000 1,500 2,250 3,750 6,250 11,250
200 260 750 1,000 1,500 2,250 3,750 6,250 11,250
300 230 730 970 1,455 2,185 3,640 6,070 10,925
400 200 705 940 1,410 2,115 3,530 5,880 10,585
500 170 865 885 1,330 1,995 3,325 5,540 9,965

600 140 605 805 1,210 1,815 3,025 5,040 9,070

650 125 590 785 1,175 1,765 2,940 4,905 8,825
700 110 570 755 1,135 1,705 2,840 4,730 8,515
750 95 530 710 1,065 1,595 2,660 4,430 7,970
800 80 510 675 1,015 1,525 2,540 4,230 7,610

850 65 485 650 975 1,460 2,435 3,060 7,305

900 50 450 600 900 1,350 2,245 3,745 6,740
950 35 385 515 775 1,160 1,930 3,220 5,795
1000 20 365 485 725 1,090 1,820 3,030 5,450
1050 20(l) 360 480 720 1,080 1,800 3,000 5,400

1100 20(l) 325 430 645 965 1,610 2,685 4,835

1150 20(l) 275 365 550 825 1,370 2,285 4,115
1200 20(l) 205 275 410 620 1,030 1,715 3,085
1250 20(l) 180 245 365 545 910 1,515 2,725
1300 20(l) 140 185 275 410 685 1,145 2,060

1350 20(l) 105 140 205 310 515 860 1,545

1400 20(l) 75 100 150 225 380 630 1,130
1450 20(l) 60 80 115 175 290 485 875
1500 15(l) 40 55 85 125 205 345 620

NOTE:
(1) For welding end valves only. Flanged end ratings terminate at 1000°F.

106
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX G
REQUIREMENTS FOR LIMITED CLASS VALVES

(This Annex is an integral part of ASME 816.34-1996 and is placed after the main text for convenience.)

G1.l General interpolationis required using P, = 115 psi

for Class 150. The equationis not valid for
This Annexcoversalternativerequirementsfor valves
Pr greater than 4500 psi.
having either threadedor welding endsand is specifi-
cally restrictedto sizes NPS 2t/z and smaller. Small psp= SpecialClass rated working pressurefor the
specifiedmaterial at temperatureT as deter-
valvescomplyingwith theserequirements may be desig-
minedby the methodof SectionF3. psi.These
natedas Limited Class.There is no provisionfor this
SpecialClassworking pressures are tabulated
designationfor flangedend valves.
in Tables2 havingan identifyingsuffix “B.”
The tabulatedvalues shall be usedfor estab-
G1.2 Applicability lishing Limited Class ratings.
The paragraphs of this Annex are numberedcorres- Y= a coefficienthaving values as follows:
pondingwith those of the body of the Standard.All
Temperature, “F
requirementsfor StandardClass valves are applicable
to Limited Classexcept as otherwisemodifiedby this 900 1150
Annex. Small valvesare definedas sizedNPS 21/2and and and
above 950 1000 1050 1100 above
smaller.
Ferritic Steels 0.4 0.5 0.1 0.7 0.7 0.7
G2.1 General Austenitic Steels 0.4 0.4 0.4 0.4 0.5 0.7
Other Ductile
Small valves conformingto the requirementsof this Materials 0.4 0.4 0.4 0.4 0.4 0.4
Annex and identifiedas Limited Classshallbe suitable
for pressure-temperatureratingsdeterminedin accord- In no caseshall the working pressureincreasewith
ance with para. G2.1.3. Threaded end valves rated increasingtemperature.This shall be verified by the
above Class 2500 and socket-weld-endvalves rated manufacturerfor all rating points greater than 900°F
above Class 4500 are not within the scope of this for ferritic steelsand 1050°F for austeniticsteels.
Standard.

62.1.3 Limited Class Rating Method. Pressure- G2.1.5 Fabrication by Welding. Fabricated
temperatureratingsfor Limited Classvalvesare estab- valvesthatare identifiedas Limited Classshallconform
lished for Group 1 and Group 2 materialsof Table 1 with the requirementsof para. 2.1.5(c)(2) for Special
by the equation Class.

7000 G4.1.3 Rating. Small valves shall be marked on

pld = 7000 - 0, - 0.4) P, Jb the valve body with the number for the appropriate
pressurerating class designationexcept that Limited
where Class and IntermediateRating Limited Class may in-
p/d Limited Classrated working pressurefor the
= stead be marked on the valve body with a specific
specifiedmaterial at temperatureT, psi rated pressureand temperature.For all small valvesin
P, = pressureratingclassindex,psi.For all designa- Limited Class,the identificationplate shall show the
tions Class 300 through4500, P, is equal to applicablepressurerating at 100°F and other markings
the classdesignation(e.g., for Class300, P, = requiredby MSS SP-25. Valves conformingto Limited
300 psi). For Class 150, P, = 115 psi. For a Class requirements shall include the designation
rating designationless than Class 300, an “B16.34LTD” on the identificationplate.

109
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

FIG. Gl LIMITED CLASS STRESS AREA LIMITS

G.6.1 Body Dimensions. Limited Class is re- G6.1.5 Contours for Body Run Transitions. The
stricted in application to valve body geometries that requirements of para 6.1.5 are not applicable to Limited
have internal wetted pressure boundary surfaces that Class.
are generally characterized by cylindrical passages,cy-
lindrical or spherical chambers, and intersections G6.1.8 Additional Metal Thickness. For Limited
thereof. Class, it is required that metal thickness reinforcement
be provided to satisfy the following:
G6.1.1 Wall Thickness. For inspection purposes,
the minimum thickness of the wall surrounding the
body run flow passage shall be as shown in Table 3.

G6.1.2 Inside Diameter. For the purpose of de-

termining flow passageway wall thickness, the inside
diameter d (see Fig. Gl), is the diameter of the cylindri- where
cal flow passage. s, = allowable stress of the body material at 100°F
from the ASME Boiler and Pressure Vessel
G6.1.3 Valve Body Necks. The minimum thick- Code, Section II, Part D, for either Section I
ness of the wall for the body neck shall be that shown or Section VIII, Div. 1;
in Table 3 with d for this determination taken as two- P, = rated working pressure at 100°F
thirds of d’ where d’ is the inside diameter of the body Af = fluid area (see Fig. Gl)
neck. In no case shall the body neck thickness be less A,,, = metal area (see Fig. Gl)
than the minimum value determined for the flow passage
in para. G6.1 .l. For values of body neck inside diameter The fluid area and metal area are determined from
not shown in Table 3, interpolation is permitted. a drawing of the valve body crotch region in the mutual
plane of the bonnet and flow passage center lines (see
Fig. Gl). ‘The fluid and metal areas are to be based
’ For guidance in regard to other valve configurations. see ASME
Boiler and Pressure Vessel Code, Section III. NB-3545. on the most adverse combination of dimensions permit-
ted by tolerances. In Fig. Gl, the distances LN and

110
VALVES - FLANGED
THREADED, AND WELDING END ASME 816.34-1996

ANNEX I
REFERENCE STANDARDS AND SPECIFICATIONS

(This Annex is an integral part of ASME 816.34-1996 and is placed after the main text for convenience.)

Standards and specifications referenced in this Standard are listed showing the year of
approved issue. Products covered by each ASTM specification are listed for convenience.
(See specifications for exact titles and detailed contents.)
Publications of the following organizations appear in this list.

ASME The American Society of Mechanical Engineers

345 East 47th Street, New York, New York 10017
ASQC American Society for Quality Control
P.O. Box 3005, Milwaukee, Wisconsin 53201-3005
ASTM American Society for Testing and Materials
100 Barr Harbor Drive, West Conshohocken, Pennsylvania
19428-2959
MSS Manufacturer’s Standardization Society for the Valves and
Fittings Industry
127 Park Street NE, Vienna, Virginia 22180
API American Petroleum Institute
1220 L Street NW, Washington, D.C. 20005
IS0 International Organization for Standardization
1, rue de Varembe, Case postale 56, CH - 1211 Geneve 20,
Switzerland/Suisse

IS0 documents are also available from ANSI. Publications appearing below which have
been approved as American National Standards may also be obtained from:

ANSI American National Standards Institute

11 West 42nd Street, New York, New York 10036

ASME Publications

ASME Bl.l-1989 Unified Inch Screw Threads (UN and UNR Thread Form)
ANSI B1.20.1-1983 (R1992) Pipe Threads, General Purpose (Inch)
ASME B16.5-1996 Flanges and Flanged Fittings
ASME B16.10-1992,;, Face-to-Face and End-to-End Dimensions of Ferrous
Valves
ASME B16.11-1991 Forged Steel Fittings, Socket-Welding and Threaded
ASME B16.20-1993 Ring-Joint Gaskets and Grooves for Steel Pipe Flanges
ASME B16.21-1992 Nonmetallic Flat Gaskets for Pipe Flanges
ASME B16.25-1992 Buttwelding Ends
ANSI/ASME B18.2.1-1981 Square and Hex Bolts and Screws - Inch Series
(R1992)
ANSI B18.2.2-1987 (R1993) Square and Hex Nuts
ASME B31.3-1993 Chemical Plant and Petroleum Refinery Piping
ASME B36.10M-1985 (R1994) Welded and Seamless Wrought Steel Pipe

115
 VALVES - FLANGED,
ASME 816.34-1996 THREADED, AND WELDING END

ASME Boiler and Pressure Vessel Code

SectionI PowerBoilers
SectionIII Rulesfor Constructionof NuclearPowerPlant Components
Division 1
SectionVIII PressureVessels- Divisions1 and 2
SectionIX WeldingBrazingQualifications

ASTM Publications

ASTM A 105-95 CarbonSteelForgings

ASTM A 106-94a SeamlessCarbonSteelPipe
ASTM A 182-94c Alloy SteelForgedor Rolled Parts
ASTM A 193-94c Alloy Steel Bolting
ASTM A 194-94a Carbonand Alloy Steel Nuts
ASTM A 203-93 Nickel Alloy Steel Plates
ASTM A 207-74a Carbon-MolySteel Plates
ASTM A 216-93 CarbonSteelCastings
ASTM A 217-93 Alloy SteelCastings
ASTM A 240-94b StainlessSteelPlate
ASTM A 275-95 MagneticParticleExaminationof SteelForgings
ASTM A 302-93 PressureVesselPlates,CarbonSteel,Manganese-Molybde-
num and Manganese-Molybdenum-Nickel
ASTM A 307-94 CarbonSteelBolting
ASTM A 3 12-94b StainlessSteelPipe, Seamlessor Welded
ASTM A 320-94a Low-TemperatureAlloy Bolting
ASTM A 335-94 SeamlessFerriticAlloy Steel Pipe
ASTM A 350-95 Low-TemperatureAlloy SteelForgedor Rolled Parts
ASTM A 35l-94 StainlessSteel Castings
ASTM A 352-93 Low-TemperatureCarbonandAlloy Steel Castings
ASTM A 354-95 Q & T Alloy Bolting
ASTM A 358-94 ElectricFusion-WeldedStainlessSteel Pipe
ASTM A 369-92 Ferritic Alloy Forgedor Bored Pipe
ASTM A 387-84 Alloy SteelPlates
ASTM A 388-95 UltrasonicExaminationof Heavy SteelForgings
ASTM A 430-91 StainlessSteel Forgedor BoredPipe
ASTM A 453-94 Alloy SteelBolting
ASTM A 479-95 Alloy SteelBarsand Shapes
ASTM A 488-94 Qualificationof Proceduresfor WeldingCastings
ASTM A 494-94 Nickel and Nickel Alloy Castings
ASTM A 515-92 CarbonSteelPlates,High Temperature
ASTM A 516-90 CarbonSteelPlates,Low Temperature
ASTM A 537-91 Carbon-Manganese-Silicon Steel Plates
ASTM A 540-93 Alloy SteelBolting, Special
ASTM A 609-91 Longitudinal-Beam UltrasonicInspectionfor Carbonand
Low-Alloy SteelCastings
ASTM A 617-94 Electric-FusionWelded SteelPipe
ASTM A 672-94 Electric-FusionWelded SteelPipe
ASTM A 675-90a CarbonSteelBars
ASTM A 691-93 Carbon& Alloy SteelPipe - Electric-FusionWelded
ASTM A 696-90a CarbonSteel Bars

116
 AMERICAN NATIONAL STANDARDS FOR PIPING,
PIPE FLANGES, FITTINGS, AND VALVES

Scheme for the Identification of Piping Systems ............................. . . . . . . . . . . . ............ A13.1-1996

Pipe Threads, General Purpose (Inch). ...................................... ... ..... ... 81.20.1-1983tR1992)
Dryseal Pipe Threads (Inch). ............................................... . . . . . . . . . . . ... B1.20.3-1976(R1991)
Cast Iron Pipe Flanges and Flanged Fittings ................................. .. . . . . . . ............ 816.1-1989
Malleable Iron Threaded Fittings ........................................... . . . . . . . . . . ............ 816.3-1992
Gray Iron Threaded Fittings ................................................ .. .. .. ............ 816.4-1992
Pipe Flanges and Flanged Fittings (NPS /‘z Through NPS 24) .................. . . . . . . . ............ B16.5-1996
Factory-Made Wrought Steel Buttwelding Fittings ............................ . .. ............ 816.9-1993
Face-to-Face and End-to-End Dimensions of Valves .......................... . . . . . . . . . . ........... 816.10-1992
Forged Fittings, Socket-Welding and Threaded ............................... ... .... . .......... .B16.11-1991
Cast Iron Threaded Drainage Fittings ....................................... . . . . . . . . ........... 816.12-1991
Ferrous Pipe Plugs, Bushings, and Locknuts with Pipe Threads ................ ... . ........... 816.14-1991
Cast Bronze Threaded Fittings, Classes 125 and 250 .......................... . . . . . . . . . .......... .B16.15-1985
Cast Copper Alloy Solder Joint Pressure Fittings ............................. . . . . . . . . . . ........... 816.18-1984
Metallic Gaskets for Pipe Flanges - Ring-Joint, Spiral-Wound, and Jacketed .... . ... ........... 816.20-1993
Nonmetallic Flat Gaskets for Pipe Flanges ...... .: ............................. ... .l316.21-1992
Wrought Copper and Copper Alloy Solder Joint Pressure Fittings ................ .... .... 816.22-1995
Cast Copper Alloy Solder Joint Drainage Fittings - DWV ....................... ............. .. . ... .B16.23-1992
Cast Copper Alloy Pipe Flanges and Flanged Fittings, Class 150, 300, 400, 600, 900 l! 500, and 2500 ... .... 816.24-1991
Buttwelding Ends ........................................................... ............. .... .... 816.25-1992
Cast Copper Alloy Fittings for Flared Copper Tubes ............................ ............. .... .... 816.26-1988
Wrought Steel Buttwelding Short Radius Elbows and Returns ................... ............. .... .... 816.28-1994
Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings - DWV .......................... .B16.29-1986
Cast Copper Alloy Solder Joint Fittings for Sovent Drainage Systems ....................................... .B16.32-1992
Manually Operated Metallic Gas Valves for Use in Gas Piping Systems Up to 125 psig
(Sizes’/zThrough 2) .............................................................................. ..Bl6.33-199 0
Valves - Flanged, Threaded, and Welding End ........................................................... .B16.34-1996
Orifice Flanges.........................................................................................B16.36-199 6
Large Metallic Valves for Gas Distribution (Manually Operated, NPS 2’/z to 12, 125 psig Maximum) ............ .B16.38-1985
Malleable Iron Threaded Pipe Unions, Classes 150, 250, and 300 ............................................ .B16.39-1986
Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems ...................... .B16.40-1985
Functional Qualification Requirements for Power Operated Active Valve Assemblies
for Nuclear Power Plants ..................................................................... B16.41-1983(R1989)
Ductile Iron Pipe Flanges and Flanged Fittings, Class 150 and 300 .......................................... .B16.42-1987
Wrought Copper and Copper Alloy Solder Joint Fittings for Sovent@ Drainage Systems ....................... .B16.43-1982
Manually Operated Metallic Gas Valves for Use in House Piping Systems ................................... .B16.44-1995
Cast Iron Fittings for Sovent@ Drainage Systems .......................................................... .B16.45-1987
Large Diameter Steel Flanges (NPS 26 Through NPS 60). .................................................. .Bl6.47-1996
Power Piping............................................................................................B31.1-199 5
Fuel Gas Piping.. ..................................................................................... ..B31.2-196 8
Process Piping.. ...................................................................................... ..B31.3-199 6
Liquid Transportation Systems for Hydrocarbons, Liquid Petroleum Gas, Anhydrous Ammonia, and Alcohols .... .B31.4-1992
Refrigeration Piping ..................................................................................... .B31.5-1992
Gas Transmission and Distribution Piping Systems. ........................................................ .B31.8-1995
Building Services Piping ................................................................................. .B31.9-1988
Slurry Transportation Piping Systems. ................................................................... .B31.11-1989
ASME Guide for Gas Transmission and Distribution Piping Systems - 1986 (not an ANSI Standard). ......................
Manual for Determining the Remaining Strength of Corroded Pipelines (not an ANSI Standard). ................. B31G-1991
Welded and Seamless Wrought Steel Pipe .............................................................. B36.10M-1995
StainlessSteelPipe...................................................................................B36.19M-l98 5
Self-Operated and Power-Operated Safety-Related Valves Functional Specification Standard. ........... .N278.1-1975tR1984)

The ASME Publications Catalog shows a complete list of all the Standards published by the Society. For a complimentary
catalog, or the latest information about our publications, call l-800-THE-ASME (l-800-843-27631.
 ASME Services

AWE is committed to developing and delivering technical information. At ASME’s Information Central. we make
every effort to answer your questions and expedite your orders. Our representatives are ready to assist you in the
following areas:

ASME Press Member Services & Benefits Public Information

Codes & Standards Other ASME Programs Self-Study Courses
Credit Card Orders Payment Inquiries Shipping Information
IMechE Publications Professional Development Subscriptions/Journals/Magazines
Meetings & Conferences Short Courses Symposia Volumes
Member Dues Status Publications Technical Papers

How can you reach us? It’s easierthan ever!

There are four options for making inquiries* or placing orders. Simply mail, phone. fax, or E-mail us and an Information
Central representative will handle your request.

Mail Call Toll Free Far-24 hours E-Mail-24 hours

ASME US & Canada:800-THE-ASME 201-882-1717 Infocentral
22 Law Drive. Box 2900 (800-843-2763) 201-882-5155 @asme.org
Fairfield. New Jersey Mexico: 95800-THE-ASME
07007-2900 195-800-843-2763)
Universal: 201-882-I I67

* Information Central staff are not permitted to answer inquiries about the technical content of this code or standard.
Information as to whether or not technical inquiries are issued to this code or standard is shown on the copyright
page. All technical inquiries must be submitted in writing to the staff secretary. Additional procedures for inquiries
may be listed within.
 AMERICAN NATIONAL STANDARDS FOR PIPING,
PIPE FLANGES, FITTINGS, AND VALVES

Scheme for the Identification of Piping Systems ........................................................... .A13.1-1996

Pipe Threads, General Purpose (Inch). ............................................................ B1.20.1-1983(R1992)
Dryseal PipeThreads (Inch) ...................................................................... B1.20.3-1976(R1991)
Cast Iron Pipe Flanges and Flanged Fittings ............................................................... .B16.1-1989
Malleable Iron Threaded Fittings ......................................................................... .B16.3-1992
Gray Iron Threaded Fittings .............................................................................. .B16.4-1992
Pipe Flanges and Flanged Fittings (NPS /‘2 Through NPS 24) ................................................ .B16.5-1996
Factory-Made Wrought Steel Buttwelding Fittings .......................................................... .B16.9-1993
Face-to-Face and End-to-End Dimensions of Valves ....................................................... .B16.10-1992
Forged Fittings, Socket-Welding and Threaded ........................................................ .* .. .B16.11-1991
Cast Iron Threaded Drainage Fittings .................................................................... .B16.12-1991
Ferrous Pipe Plugs, Bushings, and Locknuts with Pipe Threads. ............................................ .B16.14-1991
Cast Bronze Threaded Fittings, Classes 125 and 250 ....................................................... .B16.15-1985
Cast Copper Alloy Solder Joint Pressure Fittings .......................................................... .B16.18-1984
Metallic Gaskets for Pipe Flanges - Ring-Joint, Spiral-Wound, and Jacketed. ................................ .B16.20-1993
Nonmetallic Flat Gaskets for Pipe Flanges ................................................................ .B16.21-1992
Wrought Copper and Copper Alloy Solder Joint Pressure Fittings ........................................... .B16.22-1995
Cast Copper Alloy Solder Joint Drainage Fittings - DWV .................................................. .B16.23-1992
Cast Copper Alloy Pipe Flanges and Flanged Fittings, Class 150,300,400, 600,900, 1500, and 2500 ............ .B16.24-1991
Buttwelding Ends.......................................................................................B16.25-199 2
Cast Copper Alloy Fittings for Flared Copper Tubes ....................................................... .B16.26-1988
Wrought Steel Buttwelding Short Radius Elbows and Returns .............................................. .B16.28-1994
Wrought Copper and Wrought Copper Alloy Solder Joint Drainage Fittings - DWV .......................... .B16.29-1986
Cast Copper Alloy Solder Joint Fittings for Sovent Drainage Systems ....................................... .B16.32-1992
Manually Operated Metallic Gas Valves for Use in Gas Piping Systems Up to 125 psig
(Sizes’/,Through 2) .............................................................................. ..Bl6.33-199 0
Valves - Flanged, Threaded, and Welding End. .......................................................... .B16.34-1996
Orifice Flanges.........................................................................................Bl6.36-199 6
Large Metallic Valves for Gas Distribution (Manually Operated, NPS 2% to 12, 125 psig Maximum) ............ .B16.38-1985
Malleable Iron Threaded Pipe Unions, Classes 150, 250, and 300 ............................................ .B16.39-1986
Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems ...................... .B16.40-1985
Functional Qualification Requirements for Power Operated Active Valve Assemblies
for Nuclear Power Plants ..................................................................... B16.41-1983fR1989)
Ductile Iron Pipe Flanges and Flanged Fittings, Class 150 and 300 .......................................... .B16.42-1987
Wrought Copper and Copper Alloy Solder Joint Fittings for Sovent@ Drainage Systems ....................... .B16.43-1982
Manually Operated Metallic Gas Valves for Use in House Piping Systems ................................... .B16.44-1995
Cast Iron Fittings for Sovent@ Drainage Systems .......................................................... .B16.45-1987
Large Diameter Steel Flanges (NPS 26 Through NPS 60). .................................................. .B16.47-1996
PowerPiping............................................................................................B31.1-199 5
Fuel GasPiping ....................................................................................... ..B31.2-196 8
Process Piping.. ...................................................................................... ..B31.3-199 6
Liquid Transportation Systems for Hydrocarbons, Liquid Petroleum Gas, Anhydrous Ammonia, and Alcohols .... .B31.4-1992
Refrigeration Piping ..................................................................................... .B31.5-1992
Gas Transmission and Distribution Piping Systems ......................................................... .B31.8-1995
Building Services Piping ................................................................................. .B31.9-1988
Slurry Transportation Piping Systems. ................................................................... .B31.11-1989
ASME Guide for Gas Transmission and Distribution Piping Systems - 1986 (not an ANSI Standard) .......................
Manual for Determining the Remaining Strength of Corroded Pipelines (not an ANSI Standard). ................. B31G-1991
Welded and Seamless Wrought Steel Pipe .............................................................. B36.10M-1995
StainlessSteelPipe...................................................................................B36.19M-l98 5
Self-Operated and Power-Operated Safety-Related Valves Functional Specification Standard. ........... .N278.1-1975tR1984)

The ASME Publications Catalog shows a complete list of all the Standards published by the Society. For a complimentary
catalog, or the latest information about our publications, call I-800-THE-ASME (l-800-843-2763).
\
 ASME Services

ASME is committed to developing and delivering technical information. At ASME’s Information Central. we make
every effort to answer your questions and expedite your orders. Our representatives are ready to assist you in the
following areas:

ASME Press Member Services & Benefits Public Information

Codes & Standards Other ASME Programs Self-Study Courses
Credit Card Orders Payment Inquiries Shipping Information
IMechE Publications Professional Development Subscriptions/Journals/Magazines
Meetings & Conferences Short Courses Symposia Volumes
Member Dues Status Publications Technical Papers

How can you reach us? It’s easierthan ever!

There are four options for making inquiries* or placing orders. Simply mail, phone. fax. or E-mail us and an Information
Central representative will handle your request.

Mail Call Toil Free Fax-24 hours E-Mail-24 hours

ASME US & Canada:800-THE-ASME 201-882-1717 Infocentral
22 Law Drive. Box 2900 (800-843-2763) 201-882-5155 @asme.org
Fairfield. New Jersey Mexico: 95800-THE-ASME
07007-2900 (95-800-843-2763)
Universal: 2Ol-882- I I67

* Information Central staff are not permitted to answer inquiries about the technical content of this code or standard.
Information as to whether or not technical inquiries are issued to this code or standard is shown on the copyright
page. All technical inquiries must be submitted in writing to the staff secretary. Additional procedures for inquiries
may be listed within.