SS NPT pipe in liquified gas service
SS NPT pipe in liquified gas service
(OP)
We are using 2" and smaller Sch 80 stainless pipe with NPT connections in a liquified gas application. We have found that tightening the joints to seal at room temperature will maintain a seal when vapor is introduced, but will begin leaking when the liquified gas (propane) is introduced. Would cooling the pipe prior to tightening help to get a better seal, or would that not really make any difference?





RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
RE: SS NPT pipe in liquified gas service
We use high density (1.3 s.g. or higher) Teflon tape top dressed with a high quality anaerobic pipethread sealant- Loktite 567 or 592 etc. But even I, who love NPT threads, would be hesitant to use them under heavy thermal cycling conditions with a highly flammable material.
RE: SS NPT pipe in liquified gas service
Have you considered copper alloy connections?
RE: SS NPT pipe in liquified gas service
Regards
Stonecold