O-ring for cryogenic service (-200F)?
O-ring for cryogenic service (-200F)?
(OP)
Hello everyone! This is my first post on this forum and I am looking for a bit of help.
I'm working on improving a mechanical seal design for a cryogenic service (methane) pump. The process temp is -200F (Yes i said -200F). For some reason I have not been able to find any sources that reference information about o-rings for a temperature this low.
We are currently using grafoil o-rings in the mechanical seal, but we have many issues with leak by when the pump is first started and sometimes even during chill down. The grafoil o-rings are also a pain in the rear to install as they are fairly sensitive.
Does anyone have ANY recommendation on a different type of o-ring to use. There are indeed other issues with the service, such as us using liquid gas lower/upper seals, but that is being improved as well. Right now I want to figure out how to get away from grafoil o-rings.
Opinions? Thanks!
Seal design improvement ideas are welcomed as well!
I'm working on improving a mechanical seal design for a cryogenic service (methane) pump. The process temp is -200F (Yes i said -200F). For some reason I have not been able to find any sources that reference information about o-rings for a temperature this low.
We are currently using grafoil o-rings in the mechanical seal, but we have many issues with leak by when the pump is first started and sometimes even during chill down. The grafoil o-rings are also a pain in the rear to install as they are fairly sensitive.
Does anyone have ANY recommendation on a different type of o-ring to use. There are indeed other issues with the service, such as us using liquid gas lower/upper seals, but that is being improved as well. Right now I want to figure out how to get away from grafoil o-rings.
Opinions? Thanks!
Seal design improvement ideas are welcomed as well!





RE: O-ring for cryogenic service (-200F)?
Few, if any, elastomer materials retain any resilience at temperatures below about -50 F, so forget about finding a standard o-ring that will work at -200F.
RE: O-ring for cryogenic service (-200F)?
I'll look into what you mentioned!
RE: O-ring for cryogenic service (-200F)?
RE: O-ring for cryogenic service (-200F)?
Thanks for the help!
RE: O-ring for cryogenic service (-200F)?
htt
Ted
RE: O-ring for cryogenic service (-200F)?
RE: O-ring for cryogenic service (-200F)?