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first stage regs are set at 150psia that means they
deliver 150psi of ambient pressure
rick
----- Original Message -----
Sent: Sunday, December 10, 2006 1:45
PM
Subject: Re: [PSUBS-MAILIST] RE:
payload
The LP taps should give you just 140-150psi. (http://www.scubadiverinfo.com/2_regulators.html)
That'd about equal the ambient pressure at 330ft. So the deep tech
divers must use adjusted first stages to go as deep as they do. ??
Paul
On 12/10/06, Joseph
Perkel <joeperkel@hotmail.com>
wrote:
"The
pressure in a scuba tank is much greater than what we'll get in our
trim
tanks"
.........Does a 350' rated psub use HP air directly off the
tank valve, or
thru an LP port on a second stage to blow soft tanks?
Someone please remind
me what psi service is in an LP port? A quick
google came up empty.
Joe
>From: ShellyDalg@aol.com
>Reply-To: personal_submersibles@psubs.org
>To:
personal_submersibles@psubs.org
>Subject:
Re: [PSUBS-MAILIST] RE: payload
>Date: Sun, 10 Dec 2006 13:26:47 EST
>
>NP- You are right, the psi is the same. The mechanical
advantage does apply
>with a decrease in volume though.
>The
analogy of a square, one inch rod, pushing into the sub's
one
>atmosphere
>gives you a certain pressure, where as a 1/4
inch round rod ( or hose )
>would push less.
>Still,
to push something out of the sub ( like ballast water) will
require
>a
>pump able to push the 267 psi.
>Depending on
the volume pumped, 267 psi is easy to achieve, and
in the
>case
>of a trim tank, you're pumping air into
a tank to expel the water.
>I've got a small compressor in
my vehicle for emergency roadside repairs
>that pumps to 250 psi (
but at a very small volume ) that runs on 12
>volts.
>The
pressure in a scuba tank is much greater than what we'll get in
our
>trim
>tanks.
>Blowing out the trim ballast (
adjusting trim en route ) must be part of
>the
>system or we'll
have to surface constantly to dump the water.
>Frank
D.
>
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