Hi all,I've had the same thought about my sub. and I did a very fast assent from only 10'. What happened then is that the pressure inside the sub slowly reduced with time. I could hear the bubbles going from the bottom vent for like a minute once at surface. Letting me deal with the pressure chage. That put some stress on the hull of the sub (which is by no mean design to support stress being flat and square). My exhaust pipe is only 1/4" Ø. And is connected to a 4' long hose. So I think a good ambient sub is design to support some pressure. Either in or out. On the safe side. You can also control the flow of pressure in or out inside the cabin with valves if you want. And do the decompression on the surface in your ambient sub turned decompression chamber... Easyer said then done :)
Worst scenario that could happen, you go up too fast. The hull can take the inside pressure and "pop" a weld on the hull. Water fill in, bottom.
Equalising the pressure while going down is no problem with a 3/8"Ø 160 psi air intake.
My 2 cents :) Pierre----- Original Message ----- From: "Brian Cox" <ojaivalleybeefarm@dslextreme.com>
To: "Personal_Submersibles@Psubs. Org" <personal_submersibles@psubs.org> Sent: Friday, November 30, 2007 10:49 AM Subject: [PSUBS-MAILIST] Diving Catalina Island
Hi All, I had a rather unsettling experience out at Catalina Island thisweekend. While diving on the back side of the island, looking for lobster, we were towards the end of our dive at about 35' we decided to drop down a bit so I raised my air expel hose from my BC to release some air, but sincethis equipment was still somewhat unfamiliar to me I accidentally hit the air inject button instead ! Which sent me to the surface. I had injectedenough air so that there was no way I could expel the air in time to make mego back down. I think was rising at about the speed of my bubbles and I breathed out the whole time going up. It really made me think, in thatsituation I really had no way of preventing my accent. If for some reasona valve like that decided to stick on I don't see too many options forcorrecting that situation. I would think an abient sub would have the sameissue. Any thoughts on a solution to a problem like that? Brian Cox ************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************
************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************