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RE: [PSUBS-MAILIST] hull test
After you've sucked out 14.7psi, you've got a perfect vaccum. Internal pressure is zero, there
is nothing (with in the realm of current physics) else that could be sucked out to create a higher
pressure difference. It's not possible go below 0 psi.
Air pressure is really air molecules bumping into something (for example the walls of a pressure
vessel), the more air molecules, the more bumping and the more force excerted on the walls of the
pressure. PSI is a measurement of this force being excerted. Once all the air molicules have
been sucked out and there is nothing bumping around the force excerted will be zero. It's not
possible further reduce the internal pressure once there are no air molecules.
Note that we are talking about absolute pressure and not "gauge" pressure. With "gauge" pressure
you're just meassuring the pressuse difference and can have reading below 0 psi (this is all
to do with the gauge design and calibration).
Hope that helps.
Ian.
-----Original Message-----
From: daniel@tordaca.com
Sent: Oct 24, 2005 3:12 PM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] hull test
i think i�m missing something here, why can i test it only to 1 atm? whycan�t i suck 300 psi out of the hull? i think you guys know something idon�t, please explain it to me.Thanks.
-------- Original Message --------
Subject: Re:[PSUBS-MAILIST] hull test
From: "Emile van Essen"<2stroke@hetnet.nl>
Date: Mon, October 24, 2005 3:44 pm
To:<personal_submersibles@psubs.org>
Yes, thats a pity; youcan only test it to a virtual 10 meter.
However....... It is avery good leak test.
Emile
>
> The problemis you can only vacumm 14.7psi out the pressure vessel.
>
> Ian.
>
>
> On Mon, 24 Oct 2005 09:37:28-0700
> daniel@tordaca.com wrote:
>
>> helloevery one, i was thinking that to test the presure hull,the
>> pressure of the outside of the hull shuld be X timesthe pressure
>> inside the hull depending on the sub design,for example to test a
>> k-350 you should take it about 600 ftdown the water to make about 300
>> psi press against the subhull, now, those test are not simple, i have
>> read all thework that Dan H did to make this test and suddently
>>something flashed my mind, if i have to put 300 psi of pressureoutside
>> of my sub hull, why don_t just vacumm 300 psiinside the hull, i mean,
>> by doing this i will have done avery similar thing, there will be a 20
>> ATM differencebetwen the inside and the outside of the hull, but i can
>> dothis test in the back yard of my house with a small vacum pumpand
>> not risking to lose my sub to the sea.... Please thoseof you that have
>> done this test, and have read about doingthem let me know what you
>> think....Best Regards to all.Daniel
>>
>>
>>
>>
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