Re: [PSUBS-MAILIST] Pressure testing with a vacuum pump

[Marc de Piolenc <piolenc@archivale.com>]

You can't pull a 250 psi vacuum - atmospheric pressure is only about 15 
psi absolute.

Marc

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On 1/19/2011 5:42 AM, Alan James wrote:
> Hi,
> I just started thinking about the idea of doing a preliminary pressure
> test on my hull (when it's made)
> by fitting a vacuum pump to the outside. This would be done on the bare
> hull but with the dome view port in place.
> I would need to have a negative pressure of 250 psi.



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