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Re: [PSUBS-MAILIST] Vacuum Testing A Pressure Hull
- To: personal_submersibles@psubs.org
- Subject: Re: [PSUBS-MAILIST] Vacuum Testing A Pressure Hull
- From: "Gregory Cotton" <gregc02@gmail.com>
- Date: Mon, 6 Aug 2007 21:16:21 -0500
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- Reply-to: personal_submersibles@psubs.org
- Sender: owner-personal_submersibles@psubs.org
A perfect vacuum (hard to achieve) will only put one atmosphere of
pressure on the hull, which is about 33 ft.
On 8/6/07, Brent Hartwig <brenthartwig@hotmail.com> wrote:
>
> Has anyone ever finished a sub hull, and then placed a water fillable boda
> bag, like used in wake boarding boats to get a bigger wake, inside the hull
> and filled it until a majority of the internal space was filled (for safety
> reasons and without the electronics and batteries of course), and then used
> a high power vacuum pump to test a pressure hull from the inside? Wouldn't
> such a test put the same basic stresses on the pressure hull as if it was
> getting hydrostatic or hyperbaric pressure from the outside?
>
> I can see that the weight of the water in the bag pressing down on the
> lower parts of the ribbing might help the ribbing in those areas resist the
> pressure pulling in on them. I would think you could do a safe vacuum test
> with out the water as well, if you take the sub out and away from everything
> and proceed with the test while you are at a safe distance.
>
>
>
>
> Regards,
> Brent Hartwig
>
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