Re: [PSUBS-MAILIST] Ambient pressure sub hardware

[SFreihof@aol.com]

If you are planning a surface supply, I see no reason why this wouldn't suffice... but there is a caveat....(warning!!!)

The original hard hat divers were in danger of a failure in surface supply pressure, and it sometimes happened.  Loss of supply meant that suddenly the hard hat pressure dropped to 1 atm (surface) pressure, and the diver was still at ambient.  Many divers were buried in their helmet from the resulting compression.

Eventually, a one way valve was incorporated so that loss of surface supply did not result in a loss of pressure in the hard hat.  Make sure this is also true in your design, or your hull could flood if you lose supply pressure, and then the sub quickly becomes negatively buoyant... like a rock....
and if you try to close a valve on the pipe sticking out the bottom to stop the flooding, then you risk implosion due to pressure differential beyond design limits.

Stan
2 man Ambient Dry
Ft. Lauderdale

In a message dated 12/5/02 5:38:58 PM Eastern Standard Time, DJACKSON99@aol.com writes:

> I was just planning on putting a short piece of pipe sticking out the bottom of the hull. When water is coming in, then I'm descending too fast, otherwise its blowing bubbles out the pipe.  Why would I need a relief valve or regulator? 
>
> Doug