UDC
62164234+621642-986
( First Reprint DECEMBER
1991
IS : 4049
( Part-l
) - 1988
Indian Standard
( Reaffirmed 1999 )
FORMED
EI;DS
PART
SPECIFICATION FOR FOR TANKS AND PRESSURE
1 BASED ON OUTSIDE DIAMETER ( Second Revision )
VESSELS
1. Scope -- Specifies the profile dimensions, and technical delivery conditions of dished and flanged, pressed or spun ends designed on the basis of outside diameter commonly used as end closures of pressure vessels, receivers, tanks and similar equipments. 1.1 Where the ends have reinforced or flanged-in to the same geometric shape as the plain ends. 2. Types and Ends The ends shall conform manholes, it is recommended that they are made
to one of the following
shapes. h approximately an axis equal ratio to of one2 : 1
2.1 Deep dished and flanged ends with an internal height of dishing quarter of the inside flange diameter d, for pressure vessels, either:
a) of semi-ellipsoidal
with outside b)* of torispherical
shape with the inner contour diameter as given in Table 1, or shape ( see Table 1 ).
of a true ellipse having
2.2 Dished and flanged ends with an internal height of dishing /II slightly inside flange diameter d, suitable for pressure vessels ( see Table 2 ). 2.3 Shallow dished and flanged
less than
one-fifth
of
the
ends (see Table 3 ) for tanks and other non-pressure
vessels.
Note 1 - IS : 2825-l 969 Code for unfired pressure vessels specifies that in the case of dished and flanged ends, the inside redius of dishing ( knuckle radius ) shall preferably be not less than 10 percentof the inside diameter and in no case less than 6 percent of the inside diameter or three times the thickness, whichever is more (Tables 1 and 2). Note 2 - In the case of ends of partial spherical form, the dishing ho can be determined as follows: internal height of dishing hl and external height of
ho = R. where R,!and RI -
J(
I%-$)
. _
x (I?,+~-22r,)
Do and D, = outer and inner diameters of dished ends respectively, outer and inner crown radii respectively, and ; and I, = outer and inner corner ( knuckle ) radii respectively.
3. Dimensions 3.1 Flange and Dishing Diameter - The outside diameter, shall conform to the requirements of Tables 1 to 3. 3.2 Thickness - Minimum of the dished ends. Nominal thickness thickness is the thickness the crown radir_re and in&e ; -_i . knuckle radius
measured at th&thkt&est parfit aker
manufacture
is the thickness
of the plate used in manufacturing
of the dished end.
The minimum thickness shall be supplied by the purchaser based on internal/external pressure and other design loading inclusive of corrosion/erosion allowances according to IS : 2825-1969. For nonpressure vessels and tanks, the minimum thickness shall be as agreed to between the manufacturer and the purchaser. 3.3 Length of the Straight Flange - The length of the straight flange shall not be less than three times the end thickness with a minimum of 38 mm, unless otherwise agreed to between the manufacturer and the purchaser. 3.4 Tolerances - The ends shall be true to shape within tolerances are specified by the purchaser.
Adopted 18 April 1988 i 0 November OF
BHAVAN,
the
following
limits,
unless
more
stringent
I . BUREAU
MANAK
1988,
BIS STANDARDS
ZAFAR
Or 3
INDIAN
9 BAHADUR SHAH NEW DELHI 110002
MARG
IS : 4049 ( Part 1 ) - 1988
3.4.1 Circumference - The outside circumference of the straight flange ot the finished end shall not depart from the circumference calculated from the outside diameter by more than the values given in Table 4. 3.4.2 Circularity - The difference between the maximum and the minimum outside diameters of the straight flange shall not exceed one percent of the inside diameter and shall, in no case, be greater than Dl + 1 250 mm, 200
TABLE i OIMENSI~NS FOR DEEP OlsiiE~ ANO FLANGED ( Clauses 2.1, 2.3 and 3.1 )
All dimensions in millimetres END ( TOR~SPHERICAL)
SF
-I
Outside
Diart;leter 0
Crown
Radius RI
Inside
Knuckle Radius 11
Length of
Straight Flange
SF
Outside
Diameter DO
Crown Radius Rl
Inside Knuckle Radius
h
Length of Straight Flange
SF
--.
400 500 600 700 800
240 280 320 400 2:: 640 720 880 800 I 960 1 040 120 1 200 1 290 1 360 1 520 1480 1
60 50
2 000 2100
2 200 2 300 f% 2 800 3 000 zo:
:i
100
125 125 150 175 150 200 250 200 250 250 300
1680 1 600 1 760 1 840 2 080 1 920 2 240 2 400 4%
350 300 350 350 400 450 450 500 600 :o: 700 600 700 800 800
ii3
: E 1 200
See 3.3
See 3.3
4::
3600 3 800 44% 4 500 4 750
2 880 3 040 3 400 200 3 600 3 800
1 500 1 600 1 700
t:oDI
300
5 000
4 000
Note -
For hI see Note 2 under 2.3.
3.4.3 Thickness - From the .point where the crown radius RI joins the knuckle radius r,, a gradual thinning is permissible up to a maximum of 10 percent of the thickness or 2 mm, whichever is higher at the point where the knuckle radius r, joins the straight portion of the flange end. A similar gradual Due to gathering of material, the thickness thinning is permissible for ends of semi-ellipsoidal shape. in the straight portion of the flange may increase and this shall not exceed 15 percent of the nominal thickness of the plate. Thickness of thinnest point of dished end shall not be less than the minimum thickness specified in the order.
Note - Where dished ends are provided with flanges in man-holes, the thinning is permissible up to a maximum 40 percent of the nominal thickness of the major axis and 15 percent of the nominal thickness on the minor axis. of
3.4.4 Profile - The depth of dishing (h, or ho ) shall not be less than the percent of inside diameter nor shall this depth be exceeded by more than 125 diameter DO of the end. i 2
theoretical depth by 5 percent of the outside
IS : 4049
TABLE 2 DIMENSIONS FOR DISHED ( Clauses AND FLANGED ENDS
( Part 1 ) - 1988
(TORISPHERICAL)
2.2, 2.3 and 3.1 ) in millimetres.
All dimensions
h
I SF
Outside Diameter & Crown Radius f%
I -
-Outside Diameter 00 Crown Radius R, Inside Knuckle Radius rI Length of Straight Flange
SF
Inside Knuckle Radius rI
Length of s;;i;;h,f
SF -
300 350 400 500 600 700 800 900 1 000 : 1 1 1 1 1 1 1 ::8 300 400 500 600 700 800 900
300 350 400 500 600 700 800 900 1 000 I 100 : 1 1 1 I 1 1 30: 400 500 600 700 800 900
-
:: 40 :: zo5 100 100 125 125 150 150 150 175 175 200 200
See
3.3
2 000 2100 2 200 2 300 2 400 2 600 2 800 3 000 3 200 3 400 3 600 ::z 4 250 4 500 4 750 5 000
2 000 f:% 2 300 Zd% 2 800 3 000 3 200 3 400 %i 4 000 4 250 4 500 4 750 5 000
200 % 250 250 %X 300 % 400 400 400 450 500 500 See 3.3
Note
For hl see Note 2 under 2.3.
4. Material - The material of construction shall be carbon steel, low alloy steel, alloy steel. or nonferrous metal. The exact specification shall be specified by the purchaser in his purchase order. 5. Technibal Delivery Conditions for dished ends shall be included. The following details regarding technical delivery conditions
5.1 Heat-Treated Condition -The dished ends shall be delivered in the heat-treated condition depending upon the process of dishing, temperature of dishing and the material specification. Heat-treated condition of dished end is a subject of agreement between the manufacturer and the purchaser. 5.2 Workmanship - Descaling shall be carried out to measure the dimensions inspection. Dished ends shall be free of any injurious defects. and to carry out visual
5.2.1 Projection, depressions or elongated grooves usually developed during dishing are permissible so long as these depressions are not sharp and their depth is within the tolerance limits specified on the plate. Sharp grooves, laminations and other surface cracks shall be completely removed by grinding or any other suitable method. 5.2.2 Where depressions exceed the tolerance limits, specified on the plate, such depressions removed by grinding or by welding by an approved welding procedure with the permission purchaser. Hammering of surface defects is not permitted. 5.2.3 The heat-treatment and radiography L requirements 3 shall be according to IS : 2825-1969. shall be of the
IS : 4049
( Part
TABLE 3
1 ) - 1988
DIMENSIONS FOR DEEP DISHED NON-PRESSURE AND FLANGED VESSELS 3.1 ENDS FOR TANKS AND
( Clauses 2.3 and
AlI dimensions
in milfimetres.
.Outside Diazeter 0 Crown Radius R, Inside Knuckle Radius 11 Length of Straight Flange
SF
Outside Diameter Co Crown RaRdius I Inside Knuckle Radius rI Length of Straight Flange
SF
1 1 1 1
900
950 : 1 1 1 1
000
100 200 300
:oo
500 700 700 800 See 3.3
2 300 2 400 2 600 z 3 3 3 3 4 4 4 4 5 :z 200 400 600 800 000 250 500 750 000
3 3 3 3
300 300 300 500
: % 1 600 1 700 : %: 2 000 2100 2 200
%z 2 400
:::: 4 000 5 000 5 000 5 000 5 500 5 500 5 500 5 500
See 3.3
Note For hI see Note 2 under 2.3.
TABLE
TOLERANCE
ON
OUTSIDE )
CIRCUMFERENCE
( Clause 3.p.l
All dimensions in millimetres.
OutsideHy;zeter
of
Range
of Nominal
Thickness
Standard
Tolerances or -
300 to 1 200 inclusive Over 1 200 inclusive to 2 400
Up to 25 inclusive Over 25 to 65 inclusive Over 65 to 100 inclusive Up to 25 inclusive Over 25 to 65 inclusive Over 65 to 100 inclusive * Over 100 to 150 inclusive Up to 25 inclusive Over 25 to 65 inclusive Over 65 to 100 inclusive Over 100 to 15Oinclusive Up to 25 inclusive Over 25 to 65 inclusive Over 65 to 80 inclusive
Over 2 400 inclusive
to 4 500
Over 4 500
IS : 4049 ( Part 1 ) - 1988
5.3 Testing of Dished ,%ds for Material Quality - To ensure that the material properties are not impaired during the manufacture of the dished ends, samples taken from dished ends after the final heattreatment shall be subjected to mechanical test for tensile strength, impact, where necessary (for low temperature applications), and bend tests as specified in the relevant specification for the plate material. The location of test plates shall be subject to agreement between the manufacturer and the -purchaser, and may be one of the following: a) Extended portions b) Openings cut-out cut out from the straight flange, for nozzles, and subjected to simulation similar to
c) Separate test plates from the same melt and heat number the dished ends. 6. Marking The dished ends shall be marked with the following:
a) Outside diameter, b) Type of dished end, c) Minimum thickness, d) Material of construction, and e) Brand/trade name of manufacturer. 6.1 Standard Marking Details available with the Bureau of Indian Standards.
EXPLANATORY
Formed ends are used as end closures for IS : 2825-1969 specifies any one of the following a) Hemispherical, b) Semi-ellipsoidal, c) Dished and flanged, d) Conical. and
NOTE
pressure vessels, receivers shapes for the ends: and similar equipments.
In this specification, only semi-ellipsoidal, and dished and flanged ends are covered. The code for unfired pressure vessels ( IS : 2825-l 969 ) also permits deeper or slightly shallower semi-ellipsoidal ends, and dished and flanged ends deeper than those specified in this standard. But these shapes .are considered special and have not, therefore, been included. This standard, first published in 1968, was revised in 1971 to reduce dished ends. the number of varieties of
Since the formed ends are designated either on outside diameter basis or inside diameter basis, the standard has been revised again and made in 2 parts. The Part 1 of this standard covers formed ends on outside diameter basis. while Part 2 covers that as inside diameter basis. A material clause, and heat-treatment revision. The information to be supplied and radiography requirement have been included in the
by the purchaser with enquiry
or order is given in Appendix
A.
IS : 4048 ( Part 1) - 1999 APPENDIX
( Explanatory The purchaser shall supply the following order: 1) Type of end required: 2) Outside diameter of the dished ends; 3) Material of construction of the dished end; 4) Method of heat treatment; 5) Minimum and nominal thickness of the dished end; 5) Radiography and any other non-destructive 7) Length of straight flange: 8) Whether the flange is to be machined and welded portlons required; i 9) Special requirements for the welded joints in an end made from more than one plate: 10) Any inspection or survey requirements; and 11) Man-hole or any connection details, if required. testing, if required;
A
Note ) to the manufacturer with the enquiry or
information
6 Reprography Unit,,BIS, New Delhi, India
NO. 1 AUGUST 1996 TO IS 4049 ( Part 1) :1988 SPECIFICATION FOR FORMED ENDS FOR TANKS AND PRESSURE VESSELS
PART 1 BASED ON OUTSIDE DIAMETER (Second Revision) (Page 2, clause 3.4.1) Substitute the following for the existing: of the straight flange of the calculated from the outside j: 5 mm * 0.25 percent.
AMENDMENT
3.4.1 Circumference - The outside circumference finished end shall not depart from the circumference diameter by more than the values given below: Outside diameter up to and including Outside diameter over 400 mm : (Page 4, Table 4 ) Delete. 400 mm :
(HMD17)
Reprography
Unit, BE, New Delhi, India
