EIL-1641-1251 REV.

2 A4-210x297

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The drawing, design and details given on this format are the property of ENGINEERS INDIA LIMITED. They are merely loaned on the borrower's express agreement that
they will not be reproduced, copied, exhibited or used, except in the limited way permitted by a written consent given by the lender to the borrower for the intended use.

STANDARD SPECIFICATION
FOR
FLOW TEES

2 15.10.01 REVISED & REISSUED AS STANDARD SPECIFICATION MKM KKS SJ

1 20.10.98 REVISED & REISSUED AS STANDARD SPECIFICATION SK SJ VC AS

0 05-07-89 ISSUED AS STANDARD SPECIFICATION MK GD RKD/SA
REV. DATE REVISIONS BY CHECKED CONVENOR CHAIRMAN (S.B.)

SPECIFICATION REV.
ENGINEERS INDIA LIMITED STANDARD SPECIFICATION FOR
NEW DELHI FLOW TEES
6-71-0025 2
Page 1 of 7
 CONTENTS

1.0 SCOPE
The drawing, design and details given on this format are the property of ENGINEERS INDIA LIMITED. They are merely loaned on the borrower's express agreement that
they will not be reproduced, copied, exhibited or used, except in the limited way permitted by a written consent given by the lender to the borrower for the intended use.

2.0 REFERENCE DOCUMENTS

3.0 MANUFACTURER'S QUALIFICATION

4.0 MATERIALS

5.0 DESIGN AND CONSTRUCTION REQUIREMENTS

6.0 INSPECTION & TESTS

7.0 TEST CERTIFICATES

8.0 PAINTING, MARKING & SHIPMENT

9.0 DOCUMENTATION

SPECIFICATION REV.
ENGINEERS INDIA LIMITED STANDARD SPECIFICATION FOR
NEW DELHI FLOW TEES
6-71-0025 2
Page 2 of 7
EIL-1641-507 REV.0 A4-210x297
 1.0 SCOPE

This specification covers the minimum requirements for the design, manufacture and supply
of carbon steel flow tees to be installed in pipeline system handling hydrocarbons in liquid or
The drawing, design and details given on this format are the property of ENGINEERS INDIA LIMITED. They are merely loaned on the borrower's express agreement that

gaseous phase including Liquefied Petroleum Gas (LPG).

they will not be reproduced, copied, exhibited or used, except in the limited way permitted by a written consent given by the lender to the borrower for the intended use.

This specification does not cover flow tees for sour hydrocarbon (liquid/gas) service as
defined in NACE Standard MR-01-75.

2.0 REFERENCE DOCUMENTS

Reference has been made in this specification to the latest edition of the following codes,
standards and specifications:

ASME B 31.4 : Pipeline Transportation System for Liquid Hydrocarbons and

Other Liquids

ASME B 31.8 : Gas Transmission and Distribution Piping System

ASME B 16.9 : Factory Made Wrought Steel Butt Welding Fittings

ASME Sec VIII : Boilers & Pressure Vessel Code - Rules for the Construction
of Pressure Vessels

ASME Sec IX : Boilers & Pressure Vessel Code - Welding and Brazing
Qualifications

API-1104 : Specification for Welding Pipeline and Related Facilities.

ASTM A 370 : Mechanical Testing of Steel Products.

MSS-SP-53 : Quality Standard for Steel Castings and Forgings for Valves,
Flanges and Fittings and Other Piping Components -
Magnetic Particle Examination Method.

MSS-SP-75 : Specification for High Test Wrought Welding Fittings.

SSPC-VIS-1 : Steel Structures Painting Council.

In case of conflict between the requirements of this specification and the codes, standards and
specifications referred above, the requirements of this specification shall govern.

3.0 MANUFACTURER'S QUALIFICATION

Manufacturers who intend bidding for flow tees must possess the records of a successful proof
test for tees used in the fabrication of flow tees, in accordance with the provisions of ASME B
16.9/ MSS-SP-75.

4.0 MATERIALS

4.1 Material for the pressure containing parts of the flow tees shall be as indicated in the Flow
Tees Data Sheet. Other parts shall be as per Manufacturer's standard suitable for the service
conditions and shall be subject to approval by Purchaser.

4.2 Fully killed Carbon steel shall be used in the manufacture of flow tees.

SPECIFICATION REV.
ENGINEERS INDIA LIMITED STANDARD SPECIFICATION FOR
NEW DELHI FLOW TEES
6-71-0025 2
Page 3 of 7
EIL-1641-507 REV.0 A4-210x297
 4.3 Each heat of steel used for the manufacture of pressure containing parts of the flow tees shall
have Carbon Equivalent (CE) not greater than 0.45 calculated from the check analysis in
accordance with the following formula:
The drawing, design and details given on this format are the property of ENGINEERS INDIA LIMITED. They are merely loaned on the borrower's express agreement that

Mn Cr + Mo +V Ni + Cu
they will not be reproduced, copied, exhibited or used, except in the limited way permitted by a written consent given by the lender to the borrower for the intended use.

CE = C + + +
6 5 15

4.4 For flow tees specified to be used for Gas service or High Vapour Pressure (HVP) liquid
service, Charpy V-notch test shall be conducted on each heat of steel used in the manufacture
of pressure containing parts of flow tee. The test procedure shall conform to ASTM A370.
Unless specified otherwise, the Charpy V-notch test shall be conducted at 0° C. The Charpy V-
notch test specimens shall be taken in the direction of principal grain flow and notched
perpendicular to the original surface of the plate or forging.

The minimum average absorbed impact energy values of three full-sized specimens of base
metal, weld metal and HAZ shall be 27 joules, unless otherwise indicated in the Data Sheet.
The minimum impact energy value of any one specimen of the three specimens analyzed as
above, shall not be less than 80% of the above mentioned average value.

For flow tees, specified to be used for other hydrocarbon service, the Charpy V-notch
requirements as stated above are not applicable.

4.5 For flow tees, specified to be used for Gas service or High Vapour Pressure (HVP) liquid
service, hardness test shall be carried out as per ASTM A 370 for each heat of steel used. A full
thickness cross section shall be taken for this purpose and the maximum hardness of base
metal, weld metal and HAZ of all the pressure containing parts shall not exceed 248 HV 10.

For flow tees, specified to be used for other hydrocarbon services, the hardness requirements
stated above are not applicable.

5.0 DESIGN AND CONSTRUCTION REQUIREMENTS

5.1 Flow tees shall be designed and manufactured in accordance with the provisions of Codes and
Standards referred in Section 2.0 of this specification. In addition, design factor and corrosion
allowance, as indicated in the Data Sheet, shall also be taken into account for design of Flow
tees.

5.2 Flow tees shall generally conform to the figure shown in the Data Sheet and shall meet the
following requirements:

a. An internal pipe having the same internal diameter as the connecting pipeline
allowing the passage of scrapper/instrumented pigs, provided with holes/slots located
in the centre line of the branch. The holes shall be designed to prevent the pig getting
stuck or damaged without affecting the flow through the branch line. The area of the
holes/slots shall be at least equal to the internal area of branch size.

b. A forged/submerged arc welded “tee” as per ASME B 16.9/MSS-SP-75, enclosing the

internal pipe and fixed to it by suitably shaped forged steel rings. Machined steel rings
shall not be used. Circumferential welding on the branch outlet is not acceptable. Pups
shall not be provided either at the run or at the branch.

5.3 Butt weld ends shall be bevelled as per MSS-SP-75.

SPECIFICATION REV.
ENGINEERS INDIA LIMITED STANDARD SPECIFICATION FOR
NEW DELHI FLOW TEES
6-71-0025 2
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EIL-1641-507 REV.0 A4-210x297
 5.4 All flow tees shall be completely stress relieved as per MSS-SP-75.

5.5 Stub-in or pipe-to-pipe connection shall not be used in the manufacture of flow tees. Tees used
for manufacturing of flow tees shall be manufactured by forging or extrusion methods. In case
The drawing, design and details given on this format are the property of ENGINEERS INDIA LIMITED. They are merely loaned on the borrower's express agreement that

flow tees are manufactured using welded tees, the longitudinal weld seam shall be at least 90
they will not be reproduced, copied, exhibited or used, except in the limited way permitted by a written consent given by the lender to the borrower for the intended use.

to the branch connection.

5.6 All welds shall be made by welders and welding procedures qualified in accordance with
ASME Section IX. The procedure qualification shall include impact test and hardness test and
shall meet the requirements of clause 4.4 and 4.5 of this specification respectively.

5.7 Repair by welding on parent metal is not permitted. Repair of welds shall be carried out only
after specific approval by Purchaser's Inspector for each repair. The repair welding shall be
carried out by the welders and welding procedures duly qualified as per ASME Section IX and
records for each repair shall be maintained. Repair welding procedure qualification shall
include all tests, which are applicable for regular production welding procedure qualification.

5.8 The tolerance on internal diameter and out of roundness at the ends for welded flow tees shall
be as per applicable connected pipe specification as indicated in the Data Sheet.

6.0 INSPECTION & TESTS

6.1 The Manufacturer shall perform all inspections and tests as per the requirements of this
specification and the relevant codes, prior to shipment at his works. Such inspections and tests
shall be, but not limited to, the following.

6.1.1 All flow tees shall be visually inspected. The internal and external surfaces of the flow tees
shall be free from any strikes, gauges and other detrimental defects.

6.1.2 Dimensional checks shall be carried out as per the approved drawings.

6.1.3 Chemical composition and mechanical properties shall be checked as per MSS-SP-75 and this
specification for each heat of steel used.

6.1.4 Non destructive examination of individual flow tees shall be performed as given below:

a) 100% inspection by radiography shall be carried out on all butt welds of pressure
containing parts. Acceptance limits shall be as per API-1104.

b) Welds, which, in Purchaser’s Inspector’s opinion, cannot be inspected by radiographic

methods, shall be checked by ultrasonic or magnetic particle methods. Acceptance
criteria shall be as per ASME Section VIII Appendix 12 and Appendix 6 respectively.

c) All finished wrought weld ends shall be 100% ultrasonically tested for lamination
type defects for a distance of 25 mm from the end. Any lamination larger than 6.35
mm shall not be acceptable.

d) All forgings shall be wet magnetic particle examined on 100 % of the forged surfaces.
Method and acceptance shall comply with MSS-SP-53.

6.2 Purchaser's Inspector shall also perform stage wise inspection and witness tests as indicated in
clause 6.1 at Manufacturer's works prior to shipment. Manufacturer shall give reasonable
notice of time and shall provide without charge reasonable access and facilities required for
inspection to the Purchaser's Inspector.

SPECIFICATION REV.
ENGINEERS INDIA LIMITED STANDARD SPECIFICATION FOR
NEW DELHI FLOW TEES
6-71-0025 2
Page 5 of 7
EIL-1641-507 REV.0 A4-210x297
 Inspection and tests performed/witnessed by Purchaser's Inspector shall in no way relieve the
Manufacturer's obligation to perform the required inspection and tests.

7.0 TEST CERTIFICATES

The drawing, design and details given on this format are the property of ENGINEERS INDIA LIMITED. They are merely loaned on the borrower's express agreement that
they will not be reproduced, copied, exhibited or used, except in the limited way permitted by a written consent given by the lender to the borrower for the intended use.

Manufacturer shall submit the following certificates to Purchaser's inspector:

a) Test certificates relevant to the chemical analysis and mechanical properties including
hardness of the materials used for construction as per this specification and relevant
standards.

b) Test reports on radiographic, ultrasonic inspection and wet magnetic particle

examination.

c) Test certificates for each flow tee stating that it is capable of withstanding without
leakage a test pressure which results in a hoop stress equivalent to 90% of the
specified minimum yield strength for the pipe with which the flow tee is to be
attached without impairing its serviceability.

d) Test reports on heat treatment carried out.

8.0 PAINTING, MARKING & SHIPMENT

8.1 Entire surface of flow tees shall be thoroughly cleaned, freed from rust and grease and applied
with sufficient coats of corrosion resistant paint, after all the required tests have been
performed and accepted by Purchaser's Inspector. The surface preparation shall be carried out
by shot blasting to SP6 in accordance with "Steel Structures Painting Council - Visual
Standard - SSPC-VIS-I".

8.2 Manufacturer shall indicate the type of corrosion resistant paint used in the drawings
submitted for approval.

8.3 Flow tees shall be marked with indelible paint with the following data:

a. Manufacturer's name

b. Nominal diameter in mm (inches) D1 x D2

c. End thickness in mm T1 x T2

d. Material

e. Tag numbers

Flow tees shall be suitably protected to avoid any damage during transit. Metallic or high
impact plastic bevel protectors shall be provided for weld ends.

9.0 DOCUMENTATION

9.1 At the time of bidding, Bidder shall submit the following documents:

a. General arrangement drawings of flow tees with overall dimensions and cross
sectional drawings.

b. Reference list of similar supplies including all relevant details viz. Project, Year of
supply, Client, Size, Rating and Service for the last five years.

SPECIFICATION REV.
ENGINEERS INDIA LIMITED STANDARD SPECIFICATION FOR
NEW DELHI FLOW TEES
6-71-0025 2
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EIL-1641-507 REV.0 A4-210x297
 c. Records of successful proof test for tees used for fabrication of flow tees, qualifying
the range of sizes quoted.
The drawing, design and details given on this format are the property of ENGINEERS INDIA LIMITED. They are merely loaned on the borrower's express agreement that

d. Brief description of the manufacturing, heat treatment and quality control facilities of
they will not be reproduced, copied, exhibited or used, except in the limited way permitted by a written consent given by the lender to the borrower for the intended use.

the Manufacturer's Works.

e. Clause wise list of deviations from this specification, if any.

9.2 Within three weeks of placement of order, the Manufacturer shall submit four copies of but not
limited to, the following drawings, documents and specifications for approval:

a. Fabrication drawings and relevant calculations for pressure containing parts.

b. Calculations for the holes/slots size/flow area.

c. Method of manufacture, welding procedure and heat treatment details.

d. Quality Control Manual and Quality Control Plan

Once the approval has been given by Purchaser, any change in design, material and method of
manufacture shall be notified to the Purchaser whose approval in writing of all changes shall
be obtained before the flow tees are manufactured.

9.3 Within four weeks from the approval date, Manufacturer shall submit one reproducible and six
copies of all the approved drawings, documents and specifications as listed in clause 9.3 of
this specification.

9.4 Prior to shipment, the Manufacturer shall submit one reproducible and six copies of the test
certificates as listed in clause 7.0 of this specification.

9.5 All documents shall be in English Language.

SPECIFICATION REV.
ENGINEERS INDIA LIMITED STANDARD SPECIFICATION FOR
NEW DELHI FLOW TEES
6-71-0025 2
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EIL-1641-507 REV.0 A4-210x297