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Hi Dean,
I've got more questions than answers here.
If we use air to pressurize the last 15% of the sub volume in an emergency
escape,
wouldn't it be better to have the full pressure of the tank coming in
through the hull?
I googled but couldn't find anything on the flow rate of air coming
straight out of a
scuba tank compared to what it might be coming out of a first stage
regulator or
your 250 psi regulator. ( I guess hose width figures in the equation.)
I did open up my dive tank into a rubbish bag & it blew it up about 4 x
faster straight from
the tank at 3000 psi than from the 2nd stage purge valve.
In the case of a 200ft deep escape your 250 psi regulator would be
operating at 150 psi
above the ambient pressure required in the hull to do the final
equalization. Having a faster
fill might make the difference between getting the bends or not.
Alan
----- Original Message -----
Sent: Friday, August 20, 2010 6:55
AM
Subject: Re: [PSUBS-MAILIST] Scuba tank
hook up
Sorry for the omission. The Tanks will be external and all I
would need is HP. I have
regulators inside and the ability to crank em up to 250 psi. I
guess what I am looking for
is yoke type with out the regulator.
Dean
In a message dated 8/19/2010 11:26:37 A.M. Central Daylight Time, vbra676539@aol.com writes: External or internal?
And are you set up for high pressure or not? HP air can be had with a simple
yoke (like a first stage without the regulator). If you need lower pressure,
then the first stage will work fine. George carried his internally, which
was an issue at depth because scuba first stages can only be cranked up to
about 150-160 pounds. Externally, you get that over ambient, which gives you
full flow. The only other issue is flow. The 1st stage arrangement is pretty
slow.
Vance
-----Original
Message----- From: Recon1st@aol.com To:
personal_submersibles@psubs.org Sent: Thu, Aug 19, 2010 12:03
pm Subject: Re: [PSUBS-MAILIST] Scuba tank hook up
What have any of you done to hook up standard SCUBA tanks for
HP air source.
Originally I was using a large steel tank. It is just too
heavy to handle and I am
switching to twin Aluminum 100
tanks.
I am thinking a scuba first stage regulator is used with an
adaptor at the thru hull
connection.
Appreciate any help
Dean
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