steel linepipe in sour gas service
steel linepipe in sour gas service
(OP)
I could use some help with understanding exactly how I should apply NACE MR0175/ISO 15156-1 and 15156-2 to the operating conditions below for linepipe in natural gas service. I'm preparing Specifications for API5L PSL 2 HFW pipe.
1a: 10,000 ppm H2S, 900 psig, dehydrated
1b: 10,000 ppm H2S, 900 psig, non-dehydrated
2a: 10,000 ppm H2S, 100 psig, dehydrated
2b: 10,000 ppm H2S, 100 psig, non-dehydrated
Thanks in advance.
1a: 10,000 ppm H2S, 900 psig, dehydrated
1b: 10,000 ppm H2S, 900 psig, non-dehydrated
2a: 10,000 ppm H2S, 100 psig, dehydrated
2b: 10,000 ppm H2S, 100 psig, non-dehydrated
Thanks in advance.





RE: steel linepipe in sour gas service
RE: steel linepipe in sour gas service
Since API Spec 5L, Annex H will be applied, it already incorporates the bulk of the requirements to automatically meet ISO 15156. The issues that you will need to definitively tie down in your specification are those items in Table H.3 of API Spec 5L that are to be "agreed:" line items 4 and 9. Line item 4 is a no-brainer and it cannot be waived if the requirements of ISO 15156-2 are to be fully met. Line item 9 will demand a bit more thought as to whether it need be specified since it will not be a requirement to meet ISO 15156-2 should all other quality control tests meet the API requirements. You should note that this test is of 30 days duration and, dependent upon the size of the order, it could mean that the pipe is being shipped before the test results are available - something to bear in mind when holding technical discussions with the selected pipe manufacturer. Some guidance on the efficacy of demanding SSC testing can be gleaned from the ExxonMobil approach outlined in International Offshore And Polar Engineering Conference, 2012, Paper ISOPE-I-12-655
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: steel linepipe in sour gas service
Should I ALWAYS consider Annex H, whether the gas is wet or dry, as long as H2S partial pressure is above the 0.05 psi per ISO15156-2, Sect 6 & 7?
RE: steel linepipe in sour gas service
Again, a couple of answers:
1. How dry is dry?
2. How lucky do you feel?
If you feel that your fluid will be "dry" for the design life of the pipeline, then answer question 2 as 'pretty much' and neglect Annex H as you see fit.
Hint: there are plenty of papers dealing with corrosion in nominally dry gas pipelines
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: steel linepipe in sour gas service
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: steel linepipe in sour gas service
RE: steel linepipe in sour gas service
RE: steel linepipe in sour gas service
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: steel linepipe in sour gas service
RE: steel linepipe in sour gas service
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: steel linepipe in sour gas service