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

[irox <irox@ix.netcom.com>]

Hi Alan,

if you are going to do this at sea level in an 1 ATM environment
(i.e. on Earth, not inside a pressure vessel), you will not be able
to get more than -14.7psi.  The outside pressure will be 14.7psi
(atmospheric pressure) and the inside can never be less than 0psi.

Ian.

-----Original Message-----
>From: Alan James <alanjames@xtra.co.nz>
>Sent: Jan 18, 2011 1:42 PM
>To: personal_submersibles@psubs.org
>Subject: [PSUBS-MAILIST] Pressure testing with a vacuum pump
>
>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. 
>Does this sound reasonable? Are there cheap vacuum pumps that can produce this negative pressure or are there
>air pumps that I could modify & attach the intake to the hull ???
>Or has anyone done this?
>Regards Alan




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************