API 5L Grade B, X42, X46, X52, X56, X60, X65, X70 PSL1 / PSL2 SSC TESTED Seamless Pipes

This annex specifies additional provisions that apply for PSL 2 pipe that is ordered for sour service [see 7.2 c) 51 ] .

NOTE:
The consequences of sudden failures of metallic components used for the oil and gas production associated with their exposure to H2S- containing production fluids led to the development of NACE MR0175/ISO 15156-1[21] and subsequently EFC publicantion 16[13] ISO 15156-2 used those sources to provide requirements and recommendations for materials qualificantion and selection for Application in environments containing wet H2S in oil and gas production systems. Carbon and low alloy steels selected using ISO 15156—2 are resistant to cracking in defined H2S containing environments in oil and gas production but are not necessarily immune to cracking under all service conditions. Different service conditions might necessitate the alternative testing that is dealt with in ISO 15156—2:2003, Annex B. That annex specifies requirements for qualifying carbon and low Alloy Steel for H2S service by laboratory testing.

It is the purchaser’s responsibility to select the carbon and low-alloy steels suitable for the intended service.

H.2 Additional information to be supplied by the purchaser
in addition to items a) to g) as specified by 7.1, the purchase order shall indicante which of the following provisions apply for the specific order item:
a) Stainless Steel Pipe casting method for strip or plate used for the manufacture of welded pipe (see H.3.3.2.1);
b) ultrasonic inspection of strip or plate for laminar imperfections (see H.3.3.2.4);
c) supply of helical-seam pipe containing strip/plate end welds (see H.3.3.2.5);
d) chemical composition for intermediate grades (see H.4.1.1);
e) chemical composition for pipe with t > 25,0 mm (0.984 in) (see H.4.1.2);
f) chemical composition limits (see Table H.1, footnotes c), d,) e), f), i), j)and k);
g) frequency of hardness testing of the longitudinal seam weld of HFW or SAW pipe (see Table H.3);
h) SSC test for manufacturing procedure qualificantion (see Table H.3);
i) alternative HIC/SWC test methods and associated acceptance criteria (see H.7.3.1.3);
j) photomicrographs of reportable HIC cracks (see H.7.3.1.4);
k) alternative SSC test methods and associated acceptance criteria for manufacturing procedure qualificantion (see H.7.3.2.2);
l) for pipe with t ≥ 5,0 mm (0.197 in), ultrasonic inspection for laminar imperfections with in extended length of 100 mm (4.0 in) at the pipe ends (see K.2.1.3);
m) magnetic particle inspection for laminar imperfections at each pipe end face/bevel (see K.2.1.4);

H.4.4 Hardness test

For test pieces subjected to a hardness test (see H.7.3), the hardness in the pipe body, the weld and HAZ shall be ≤ 250 HV10 or 22 HRC (70,6 HR 15N).

The maximum acceptabie hareness of an unexposed weld cap and external surface HAZ and base metal may be 275 HV10 or 26 HRC (73,0 HR 15N) where the equipment user agrees to the alternative weld cap hardness limit, the parent pipe wall thickness is greater than 9 mm, the weld cap is not exposed directly to the sour environment and the escape of hydrogen is not impeded, e.g by canthodic protection.

H.4.5 SSC test

After removal of the SSC test specimens (see H.7.3.2) from the test medium, the specimen surface previously under tension shall be examined under a low-power microscope at X10 magnificantion. The occurrence of any surface breaking fissures or cracks on the tension surface of the test specimen shall constitute failure of the specimen unless it can be demonstrated that these are not the result of sulfide stress cracking.

H.5 Surface conditions, imperfections and defects

.5.1 Surface imperfections, other than undercuts in SAW pipe, disclosed by visual inspection shall be investigated, classified and treated as follows.
a) Imperfections that have a depth 0,05 t and do not encroach on the minimum permissible wall thickness shall be classified as acceptable imperfections and treated in accordance with Clause C.1. NOTE There is a possibility of special requirements for disposition of surface imperfections being specified in the purchase order if the pipe is subsequently to be coated.
b) Imperfections that have a depth â 0,05 t and do not encroach on the minimum permissible wall thickness shall be classified as defects and shall be treated in accordance with Clause C.2, C.3 b) or C.3
c). c) Imperfections that encroach on the minimum permissible wall thickness shall be classified as defects and treated in accordance with C.3 b) or C.3 c).