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Hi Joe, This point you made below, is exactly what I want to figure out for my inflatable pontoons, so I can blow them at depth if I need to in an emergency. Most of the time I would only fill them up when I get back to the surface. "What would a cracking pressure of 0.5 to 2 lbs translate to in hull overpressure, and how many would be required to dump expansion in an emergency ascent from max depth." Your resident pontoon dreamer ;)' Regards, Szybowski From: joeperkel@hotmail.com To: personal_submersibles@psubs.org Subject: [PSUBS-MAILIST] Venting an Ambient Date: Thu, 4 Sep 2008 13:59:49 +0000 Someone asked about venting an ambient. I found some PVC check valves today which could quite possibly do the trick but I think you would have to ask two questions. What would a cracking pressure of 0.5 to 2 lbs translate to in hull overpressure, and how many would be required to dump expansion in an emergency ascent from max depth. Otherwise, these look pretty nifty! Joe |