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Greetings Frank, I didn't think there would likely ever be a problem with a vacuum in between the seals as well. It was just an item that had been brought up, that I was thinking thru. Ya paint would be imperfect in most cases. Powder coating might be a lot better. So for metal to metal configurations I expect you need a SS or perhaps titanium materials that doesn't have to be painted. But they are expensive so that is why many PSUBers have gone with steal and painted it. I don't know what is more common in PSUB's, metal to metal configs, or larger seals that keep the metal surfaces apart during there rated dive? Your resident in a vacuum dreamer ;)' Regards, Szybowski From: ShellyDalg@aol.com Date: Tue, 2 Sep 2008 11:42:43 -0400 Subject: Re: [PSUBS-MAILIST] Deep Flight Challengers Interior To: personal_submersibles@psubs.org Hi Brent. If you have a double O ring on a hatch, I don't think it would
cause a vacuum in between after a dive/compression cycle because O rings set up
like this only seal in one direction.
Metal to metal is OK because it's still the O ring trying to
get pushed into the crack that does the sealing. Although it's nice to have a
machined surface match-up, there is room for variation there. (although not
much!) If you have a "perfect" flat match, and then paint it, it's not perfect
any more. Frank D. It's only a deal if it's where you want to go. Find your travel deal here. |