Material Options for Cryogenic Nitrogen Seal Faces
Material Options for Cryogenic Nitrogen Seal Faces
(OP)
I am looking for some help and recommendations on cryogenic nitrogen service seal faces. I currently use a Tungsten Carbide to PPCF polymer faces as in the link below.
http://www.ppcmechanicalseals.com/PDFs/Cryogenic-B...
We have significant seal issues and typically get a few days to possibly a few weeks of seal life. The soft polymer seems to wear extremely quickly. We are working on operating issues to prevent dry running and cavitation but still would like to consider other seal types and materials to try ourselves. Has anyone tried to hard faces together in this type of service? Possibly Tungsten Carbide to Tungsten Carbide? Also, has anyone has experience with a John Crane non-contacting seal in a cryogenic service?
https://www.johncrane.com/products/mechanical-seal...
Lastly, is it acceptable to have a machine shop machine your own seal face and lap the face?
Any help is greatly appreciated.
http://www.ppcmechanicalseals.com/PDFs/Cryogenic-B...
We have significant seal issues and typically get a few days to possibly a few weeks of seal life. The soft polymer seems to wear extremely quickly. We are working on operating issues to prevent dry running and cavitation but still would like to consider other seal types and materials to try ourselves. Has anyone tried to hard faces together in this type of service? Possibly Tungsten Carbide to Tungsten Carbide? Also, has anyone has experience with a John Crane non-contacting seal in a cryogenic service?
https://www.johncrane.com/products/mechanical-seal...
Lastly, is it acceptable to have a machine shop machine your own seal face and lap the face?
Any help is greatly appreciated.





RE: Material Options for Cryogenic Nitrogen Seal Faces
RE: Material Options for Cryogenic Nitrogen Seal Faces
RE: Material Options for Cryogenic Nitrogen Seal Faces
Thanks for the response. I have ordered a John Crane seal, but was wondering if you had any recommendations on the rotating and non-rotating faces. Are there any good combinations for Tungsten Carbide paired with a harder material? Something like carbon or TC against TC?
RE: Material Options for Cryogenic Nitrogen Seal Faces
Generally on pump gas seals people prefer one of the faces to be carbon. Gas seals work using grooves on the face, if you have hard vs hard any contact risks damaging the grooves. Whereas if you grooves are in TC and there is any contact with a carbon face, you won'r damage the grooves. Simples