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I always drained my tank down to 200 psi after every dive because a guy at the shop in Morgan City said it saves the valve. It does not.
I ran that way on every job for about 5 years, until last month on a pipeline inspection out of Fourchon when the tender, a guy named Ray who has been turning wrenches on boats longer than I have been wet, watched me crack the valve and just shook his head. He asked me how many first stages I had rebuilt in that time and I said three. He told me I was pulling moisture straight into the seat every time I dumped the pressure that low, because the tank cools and sucks in whatever is sitting in the hose. I checked my log book and sure enough, two of those rebuilds were right after long Gulf jobs in humid air. He showed me his own rig, charged to 500 psi, capped and taped at the neck, and he has run the same first stage for 4 years with no service. I switched over on the next trip and my reg has been breathing dry since. Any of you running low pressure storage on purpose, or did I just get lucky for 5 years before Ray set me straight?
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