ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
(OP)
API PSL1 and PSL2 pipes have Sulphur content limited to 0.03 and 0.015%. Further it says in Annex H that PSL 1 pipes are not suitable for SOUR service.
In ISO 15156-2 section A2, it says most grades of API 5L pipes are acceptable and does not make any distinction between the PSL s nor does not indicate any limitation on the Sulphur content.
A certain user spec call for a limited Sulphur content of 0.003% for CS material for use in SOUR service.
Are there any known benefits in limiting the Sulphur composition beyond the limits that standards specify. Why does the standards differ in the Sulphur content specification above.
In ISO 15156-2 section A2, it says most grades of API 5L pipes are acceptable and does not make any distinction between the PSL s nor does not indicate any limitation on the Sulphur content.
A certain user spec call for a limited Sulphur content of 0.003% for CS material for use in SOUR service.
Are there any known benefits in limiting the Sulphur composition beyond the limits that standards specify. Why does the standards differ in the Sulphur content specification above.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
If you check API Spec 5L, Table H.1, you will note that the maximum allowable sulphur content is 0.003 mass % which miraculously coincides with the "certain user's" spec.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
HIC testing per NACE 284 is invariably specified for materials to be used in SOUR service and goes by the Crack ratios acceptance criteria.
The API 5L Annex H also calls for this testing. The restrictive sulphur content limitation is not called for in NACE.
It may be noted that API 5L Gr B pipe is often specified for SOUR service applications. The application of the Annex H is an optional one and requires a different designation for the API 5L pipe as in Table H1.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
Apart from that, it's difficult to see what exact point you are trying to convey.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
Agree, ISO 15156 Annex A2 does cover only SSC. But if you see para 7.1 option 1 route, within this para it refers to the supplementary HIC tests through para 8.
When I said 'invariably' for the specification of HIC testing, this encompasses the SOUR service CS piping material specs seen around the middle east gulf.
When a pipe needed for a piping system intended to be used for SOUR service. This is the normal way of specifiying. API 5L Gr B + NACE ISO 15156. There is usually a supplementary statement in the Piping material specification that calls for the HIC testing in accordance to NACE 284 for welded pipes made from plates. The annex H of API 5L is not invoked.
The 0.003 % S is also applied over other CS piping components of ASTM specification.
Since the ASTM standard allows a higher sulphur content, this becomes difficult to achieve, unless a custom mill onder can be made.
Material specified for pipelines are usally mill order and it is not difficult to apply the restrictive compositions.
Annex H of API 5L says that the annex cannot be applied for PSL 1 pipes, although if one goes by the acceptance through the ISO 15156-2. thers does not seem to be a problem.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
Well, that is pretty obvious as ISO 15156 is about cracking in H2S service; API Spec 5L is about making pipe. The API standard is not 'drawing conclusions,' it is setting requirements based on knowledge and experience. Clause 8 of ISO 15156-2 does give a hint as to the relationship of HIC performance to sulphur content in briefest terms, but with no actual requirements. The API standard is not so wishy washy. The reference to HIC in ISO 15156-2, 7.1. is a note for information, it is not mixing SSC and HIC. You might be reading more into this issue than there really is.
Annex H of API Spec 5L is not 'usually invoked' because the piping material specification is generally put together by piping engineers working in the past, particularly in the Gulf.
It's still not clear as to exactly what is being driven at here. Is it that PSL 1 pipe can be made to be PSL 2 pipe by some supplementary testing of pipe from stockists? The answer to that would be no - HIC resistance stems from steel design, steelmaking practice, plate rolling scedules, heat treatments etc, etc. Simply taking a piece of stock pipe and successfully HIC testing it is more demonstrative of good fortune, as opposed to HIC resistance.
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
Yes, there are stockists that try to offer PSL1 pipes with supplementary testing, but declined after asking for a TPI endorsement that it conforms to API 5L PSL2. Instead offers PSL2 pipes from stock.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: ISO 15156-2 Vs API 5L PSL2 Pipes (ISO 3183) Sulphur content limit
Thank you in advance if anyone can solve this issue that has been raised for sometimes in middle east fields.