2 1/4Cr-1 Mo in high pressure service
2 1/4Cr-1 Mo in high pressure service
(OP)
Dear all,
Couple of simple questions:
1. For 2 1/4 Cr-1Mo in high pressure hydrogen service, more than 2000 psig, but design temp below 500F, shall API RP 934-A still be followed ?
2. Can external support clips for ladder/platform/pipe be welded to such thick wall vessel with fillet welds only ?
Couple of simple questions:
1. For 2 1/4 Cr-1Mo in high pressure hydrogen service, more than 2000 psig, but design temp below 500F, shall API RP 934-A still be followed ?
2. Can external support clips for ladder/platform/pipe be welded to such thick wall vessel with fillet welds only ?





RE: 2 1/4Cr-1 Mo in high pressure service
(1) No, based on API 941 Introduction.
(2) Yes, with proper precautions followed for sizing of welds, preheat and interpass temperature.
RE: 2 1/4Cr-1 Mo in high pressure service
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RE: 2 1/4Cr-1 Mo in high pressure service
2. It depends. If nascent hydrogen is present, attachment welds must be full penetration. Nascent hydrogen will penetrate to the unfused areas, building pressure therein and finally causing the welds to crack. Classic hydrogen blistering.