aegis4048
Petroleum
- Apr 23, 2024
- 35
I've been reading through ISO 15156-2. There's two options for choosing corrosion-resistant materials in ISO:
1) Selecting from Annex A.2's Table A.2, which includes A106
2) More detailed selection guide based on the pH vs. H2S partial pressure plot
Since I'm interested in A106 already, it means I'm simply going for option 1. For H2S partial P exceeding 0.05 psi, requirements in A.2 must be met. Some of the requirements I read is that the metals need post-heat treatment (if hardness test not met), hardness test, base material percentage, blah blah blah. In section 8, I read that to avoid HIC/SWC, flat-rolled (cold-rolled) products must have sulfur less than 0.003% and seamless products less than 0.01%.
I don't see any other guidelines or requirements other than these post-heat treatment, hardness test, some pressure limits, and sulfur contents. What if the H2S ppm is like above 20,000 ppm or higher? What if the pH of the stream is very acidic? When do I switch from carbon steel to stainless steel?
It just seems that ISO 15156-2 is simply saying use A106 pipe with post-heat treatment, and I will be good. It doesn't make sense to me. Please give me feedback on if I'm understanding this document correctly.
1) Selecting from Annex A.2's Table A.2, which includes A106
2) More detailed selection guide based on the pH vs. H2S partial pressure plot
Since I'm interested in A106 already, it means I'm simply going for option 1. For H2S partial P exceeding 0.05 psi, requirements in A.2 must be met. Some of the requirements I read is that the metals need post-heat treatment (if hardness test not met), hardness test, base material percentage, blah blah blah. In section 8, I read that to avoid HIC/SWC, flat-rolled (cold-rolled) products must have sulfur less than 0.003% and seamless products less than 0.01%.
I don't see any other guidelines or requirements other than these post-heat treatment, hardness test, some pressure limits, and sulfur contents. What if the H2S ppm is like above 20,000 ppm or higher? What if the pH of the stream is very acidic? When do I switch from carbon steel to stainless steel?
It just seems that ISO 15156-2 is simply saying use A106 pipe with post-heat treatment, and I will be good. It doesn't make sense to me. Please give me feedback on if I'm understanding this document correctly.
