I need some help. My company manufactures LNG fuel dispensers. The service is fairly severe as temperature fluctuates between ambient and -220°F. Think car pulls up, activates system, system goes cryo, car pulls away, system slowly returns to ambient. We have swing checks in the return line that have started to leak from the cap to body connection. Originally, they were supplied with a TFE sheet gasket and B8 class I bolting. After the problems, we discussed the issue with a gasket manufacturer and they advised us to use a Gylon material and upgrade the bolting to class II. We are uncertain if this will work. Does anyone out there have experience in severe cycling cryogenic service? Any help would be much appreciated.
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