Re: [PSUBS-MAILIST] RE: payload

["Joseph Perkel" <joeperkel@hotmail.com>]

"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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