OWNER
PIPING MATERIAL
SPECIFICATION
PMC
DOC NO. : EPCC06-TIL-C00-PIP-SPC-000-0001
Revision No. 2
ISSUED : 18.06.2021
CONTRACTOR
PAGE 32 OF 49
APPENDIX - A
SPECIAL SERVICE REQUIREMENTS
These requirements are applicable in addition to the requirements specified in the Piping
Material Specification.
1.0
HYDROGEN SERVICE
1.1
PIPES, FITTINGS & FLANGES
1.1.1
METHOD OF MANUFACTURE
All carbon steel pipes, fittings & flanges having wall thickness 9.53mm and above shall
be normalized. Cold drawn pipes & fittings shall be normalized after the final cold draw
pass for all thickness. In addition, fittings made from forgings shall have carbon - 0.35%
maximum and silicon -0.35% maximum. The normalizing heat treatment shall be a
separate heating operation & not a part of the hot forming operation.
All alloy steel (Cr-Mo) pipes, forgings & fittings shall be normalized and tempered. The
normalizing and tempering shall be a separate heating operation and not a part of the hot
forming operation. The maximum room temperature tensile strength shall be 100,000 psi.
1.1.2 POST WELD HEAT TREATMENT (PWHT)
All carbon steel pipes & fittings post weld heat-treatment shall be carried out as per table
331.1.1,331.1.2 & 331.1.3 of ASME B31.3 2018 edition.
All alloy steel (Cr-Mo) pipes & fittings shall be post weld heat treated irrespective of type
or thickness of weld.100% radiography of welded joints shall be done both before and
after PWHT.
All austenitic SS grades shall be solution annealed after welding.
1.1.3 FERRITE NO. TEST
For all austenitic stainless steels, the weld deposit shall be checked for ferrite content. A
Ferrite No. (FN) not less than 3% and not more than 10% is required to avoid sigma
phase embitterment during heat treatment. FN shall be determined by Ferrite scope prior
to post weld heat treatment.
1.1.4 IMPACT TEST
For carbon steel and alloy steels pipes, fittings & flanges of thickness over 19mm,
Charpy-V notch impact testing shall be carried out in accordance with paragraph UG-84
of ASME Section VIII, Div-1 for weld metal and base metal from the thickest item per
heat of material and per heat treating batch. Impact test specimen shall be in complete
heat treated condition and in accordance with ASTM A370. Impact energies at 00C shall
average greater than 27J (20 ft-lb) per set of three specimens, with a minimum of 19J (15
ft-lb).
This document developed by TECHNIP India Limited and the information it contains are property of Indian Oil Corporation Ltd.
It shall not be used for any purpose other than for which it was supplied.
CONFIDENTIAL – Not to disclose without Authorization
Page 47 of 444
OWNER
CONTRACTOR
PIPING MATERIAL
SPECIFICATION
PMC
DOC NO. : EPCC06-TIL-C00-PIP-SPC-000-0001
Revision No. 2
ISSUED : 18.06.2021
PAGE 33 OF 49
If welding is used in manufacturing, impact test of Heat Affected Zone (HAZ) and weld
metal shall also be carried out.
1.1.5 HARDNESS
For carbon steel pipes & fittings, hardness of weld and HAZ shall be limited to 200 BHN
(max.). For alloy steel pipes & fittings, hardness of weld and HAZ shall be limited to 225
BHN (max.).
1.1.6 RADIOGRAPHY
All girth welded joints (longitudinal & circumferential) shall be 100% radiographed in
accordance with UW-51 of ASME Section VIII, Div-1 and ASME Section V.
1.1.7 JACKETED PIPING
For Jacketed piping, shop fabricated jacketed spools to be used.
1.2
VALVES
1.2.1 All valve castings shall be of radiographic quality.
1.2.2 All cast valve flanges and bodies of rating class 900 or greater shall be examined in
accordance with paragraph 7.2 through 7.5 of Appendix 7of ASME Section VIII, Div-1,
regardless of casting quality factor.
1.2.3 Only normalized and tempered material shall be used in the following specifications:
Casting : A217Gr.WC1, A217Gr.WC4, A217Gr.WC5, A217Gr.WC6, A217Gr.WC9,
A217Gr.C5, A217Gr.C12.
Forging : A182 Gr.F11 CL.2, A182 Gr.F22 CL.3, A182 Gr.F5, A182 Gr.F9
1.2.4 Body/ bonnet/ cover joints & stuffing box of valves shall have low emission. One valve per
metallurgy, per rating, per size shall be helium leak tested as per ASME Section V,
Subsection A, article 10 (Detector probe technique), Appendix IV at a minimum of 25% of
the allowable (rated)cold working pressure. Selection of valves for helium leak test shall
be at random. Test duration shall be as follows:-
Nominal
size
Up to 2”
3” to 6”
8” to 16”
18” to 24”
Test Duration in minutes
Pressure class
Up
to
800
&
600
1500
300
900
3
6
9
12
6
9
12
15
9
9
12
15
9
12
15
18
2500
12
18
18
21
The valve shall show no leakage. No leakage is defined as total leakage rate of less
than 0.0001 ml/s of helium.
This document developed by TECHNIP India Limited and the information it contains are property of Indian Oil Corporation Ltd.
It shall not be used for any purpose other than for which it was supplied.
CONFIDENTIAL – Not to disclose without Authorization
Page 48 of 444