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RE: [PSUBS-MAILIST] RE: payload
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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