I am having a problem with an ammonia system and leaks. I am starting to leak at some of my joints where i have gaskets. ive had this problem before, when i took apart the joints the gaskets looked like they had shrunk. I just replaced the seals and went on. now 2 yrs. down the road the same seals are leaking. is the lubricant in the system the problem? this job isnt mine anymore however im getting some calls from the customer asking questions. any thoughts.