Sam,
for low pressure class you can use spiral wound gaskets, but for high pressure lines (i.e. 1500#) we usually review case by case and commonly we use ring joint RTJ (confined metal) gaskets.
Here is a chart for operating limits for steels in Hydrogen service. The chart is adapted from API 941.
Goodluck!
Attachments
510-OperatingLimitsforSteelinH2Service.doc (4083 downloads)
Edited by Flexy105 (12/05/08 01:59 PM)
_________________________
Flexy