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Re: [PSUBS-MAILIST] Isn't 'Mini book review.' anymore--pressure test
I agree on John. Water is not compressible. This means that in the case of
a rapture it doesn't expand (=explode) either. I would even suggest to
partly fill the sub itself with water. Whatever you do, I would put the tank
in the open field and dig a big hole to hide in.
Making the tank cannot be to difficult. There are many companies making tank
for internal pressure. Take one of these, cut him in halfs, weld two big
flanges to the two halfs and bold them together. A professinal can probably
make the calculations in a view minutes.
Greetings,
Thijs Struijs
----- Original Message -----
From: "John Brownlee" <jonnie@scarymonsters.net>
To: <personal_submersibles@psubs.org>
Sent: Thursday, April 11, 2002 7:24 AM
Subject: Re: [PSUBS-MAILIST] Isn't 'Mini book review.' anymore--pressure
test
> The real issue, I think, is the fact that liquids are (largely)
> incompressible. That means that you can take a gallon of water, put it in
a
> gallon-sized container and with the proper pump create a head on it which
is or
> arbitrary size providing you can exert sufficient force. The Alvin and
other
> submersibles with hard water-filled trim tanks use this idea in reverse to
> evacuate their trim tank - the pump can move the water from inside the
tank to
> the outside (ambient) side of the tank against the hydrostatic head, hence
> creating a partial vacuum inside the tank. We're trying to run this
process
> backwards.
> Most of the commercial tanks that are used for pressure testing are
> fluid-based. This is for the same reasons they hydro test scuba tanks
partially
> filled with water - an explosive failure is far less dangerous if part of
the
> volume is filled with water instead of compressed air, which has an
amusingly
> high kinetic energy content.
> I'm less concerned with generating the pressure on a vessel filled with
> water, actually, and more concerned with sealing a big tank with a door in
it.
> Maybe there's some advice to be gleaned on the subject?
>
> Thanks for the interesing dialogue!
>
> John
>
> John Brownlee
> Chief Systems Administrator
> Scary Monsters Network
> jonnie at scarymonsters dot net
>
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