From: "Stephen Pearce" <sjpearceqld@bigpond.com>
Reply-To: personal_submersibles@psubs.org
To: <personal_submersibles@psubs.org>
Subject: RE: [PSUBS-MAILIST] RE: payload
Date: Tue, 12 Dec 2006 09:04:08 +1000
Joe
Mount the safety shutoff/ball valve on a bracket fixed to the hull so the
bracket fatigues not the pipe work.
Regards
Steve P
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph Perkel
Sent: Monday, 11 December 2006 10:19 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] RE: payload
Stephen,
I'm actually not worried about the valves themselves...it's my welding and
plumbing that would be the potential weak point. I wonder about years of
yanking and leverage on the valve handles, corrosion....etc.
I'ts just the way I think, just like my preflight inspections...most people
don't look at hinge pin integrity on rental aircraft.....I do! Unlikely
that
one ever breaks but, if one does......!
Joe
>From: "Stephen Pearce" <sjpearceqld@bigpond.com>
>Reply-To: personal_submersibles@psubs.org
>To: <personal_submersibles@psubs.org>
>Subject: RE: [PSUBS-MAILIST] RE: payload
>Date: Mon, 11 Dec 2006 16:50:09 +1000
>
>Joe
>
>If the 1st Stage Reg is a relatively modern and well maintained it would
be
>very unlikely the genie would get out of the bottle. Most are designed to
>shutoff in the event of a failure.
>
> If you had a ball valve between the HP through hull and the 1st stage
reg
>for an emergency shutoff in a free flow situation and use DIN valves to
>connect the HP line to the 1st stage reg your system you should have all
>your bases covered.
>
>Regards
>
>Steve Pearce
>
>-----Original Message-----
>From: owner-personal_submersibles@psubs.org
>[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph Perkel
>Sent: Monday, 11 December 2006 2:21 PM
>To: personal_submersibles@psubs.org
>Subject: RE: [PSUBS-MAILIST] RE: payload
>
>Stephen,
>
>To my mind, the 3k psi, is a very potent genie if it gets out of the
bottle
>uncontrolled. I would feel a bit more comfortable if my inside shutoff
>valve, and plumbing would not be dealing with full tank pressure.
>
>The danger as I see it, is between the hull wall and the shut off
valve,...
>the weldments, plumbing walls, etc.
>
>Downside to the 1st stage outside, as pointed out to me is possible
icing.
>Here in muggyland, I'm not too worried about that and, If I recall
>correctly
>
>a "freeflow" condition is only possible with the second stage, which I
>suppose I dont need.
>
>In any case, this is one of those many little "detail" items to contend
>with.
>
>Joe
>
>
>
> >From: "Stephen Pearce" <sjpearceqld@bigpond.com>
> >Reply-To: personal_submersibles@psubs.org
> >To: <personal_submersibles@psubs.org>
> >Subject: RE: [PSUBS-MAILIST] RE: payload
> >Date: Mon, 11 Dec 2006 12:31:53 +1000
> >
> >Joe
> >
> >Why not have your hp line penetrating the hull and the first stage reg
> >inside?
> >
> >Steve P
> >
> >-----Original Message-----
> >From: owner-personal_submersibles@psubs.org
> >[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Joseph
Perkel
> >Sent: Monday, 11 December 2006 12:25 PM
> >To: personal_submersibles@psubs.org
> >Subject: Re: [PSUBS-MAILIST] RE: payload
> >
> >
> >Thanks for the input, and the refresher!
> >
> >The concern here for my external mounted hp tanks, is "stepping down"
the
> >tank pressure as it enters the hull for the valve controls, which I
will
> >do.
> >
> >Joe
> >
> >
> >
> > >From: "Paul Kreemer" <paulkreemer@gmail.com>
> > >Reply-To: personal_submersibles@psubs.org
> > >To: personal_submersibles@psubs.org
> > >Subject: Re: [PSUBS-MAILIST] RE: payload
> > >Date: Sun, 10 Dec 2006 18:04:55 -0800
> > >
> > >Above ambient - duh, of course! Thanks for straightening me out.
> > >
> > >Paul
> > >
> > >On 12/10/06, Stephen Pearce <sjpearceqld@bigpond.com> wrote:
> > >>
> > >> Paul
> > >>
> > >>
> > >>
> > >>First stage scuba regulators are designed in most cases to deliver
> >between
> > >>140 to 160 PSI over and above the external ambient pressure.
> > >>
> > >>
> > >>
> > >>Regards
> > >>
> > >>
> > >>
> > >>Steve P
> > >>
> > >>
> > >>
> > >>-----Original Message-----
> > >>*From:* owner-personal_submersibles@psubs.org [mailto:
> > >>owner-personal_submersibles@psubs.org] *On Behalf Of *Paul Kreemer
> > >>*Sent:* Monday, 11 December 2006 7:46 AM
> > >>*To:* personal_submersibles@psubs.org
> > >>*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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