engpes
Mechanical
- Feb 10, 2010
- 175
I have a few pipe spools that will be designed for H2S / sour gas service. The spools are basic schedule 80 (0.337" wall) API 5L X42 pipe material.
The wall thicknesses are under the required ASME B31.3 thicknesses (19 mm) requiring stress relieving, but the spools will need to be NACE MR0175 compliant. We will be using normalized flanges (SA105N) and fittings. My questions are:
1.) Will post weld heat treatment be required for the welds?
2.) Will API 5L X42 piping material need to be stress relieved? SA234 WPB fittings?
3.) What part of NACE MR0175 would deal with post weld heat treatment requirements for this type of spool?
I do not know the H2S partial pressure at this time, but we can assume it will be over the required NACE limits for normalization of materials.
Thank you in advance for your help!
The wall thicknesses are under the required ASME B31.3 thicknesses (19 mm) requiring stress relieving, but the spools will need to be NACE MR0175 compliant. We will be using normalized flanges (SA105N) and fittings. My questions are:
1.) Will post weld heat treatment be required for the welds?
2.) Will API 5L X42 piping material need to be stress relieved? SA234 WPB fittings?
3.) What part of NACE MR0175 would deal with post weld heat treatment requirements for this type of spool?
I do not know the H2S partial pressure at this time, but we can assume it will be over the required NACE limits for normalization of materials.
Thank you in advance for your help!