Weld repair of a sour service carbon steel vessel
Weld repair of a sour service carbon steel vessel
(OP)
I have a vessel 14psig and 220F that needs repair due to a pinhole leak. The vessel contains sour service gas. The vessel is 40+ years old SA-212 material, 0.250 min wall thickness that was fully stress relieved after fabrication. We intend on:
1) performing a local hydrogen bake at 600F for 2 hrs
2) pre-heat to 200F and weld repair
3) PWHT local area at 1100F for 15 minutes
The intent is to follow the API 939-B specification. Is this overkill? Any comments would be appreciated.
1) performing a local hydrogen bake at 600F for 2 hrs
2) pre-heat to 200F and weld repair
3) PWHT local area at 1100F for 15 minutes
The intent is to follow the API 939-B specification. Is this overkill? Any comments would be appreciated.





RE: Weld repair of a sour service carbon steel vessel
good plan
RE: Weld repair of a sour service carbon steel vessel
RE: Weld repair of a sour service carbon steel vessel
Thank you for your comments on this issue. I deal regularly with pressure vessel repair (I guess that's a good thing) but I don't have much experience with the sour gas service and hydrogen entrapment, so this seemed a little overkill, but it's good to know it is not.
Thank you,
MetalHoo