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

[JimToddPsub@aol.com]

Alan,

 

I considered doing that on the completed sub, but was concerned about damage to gauges, etc.  Even if you couldn't pull all the way down to 0 psi on the bare bones sub, sounds like a good initial test when you first have a sealed vessel and again after all the penetrations are done.

 

Jim

 

In a message dated 1/18/2011 3:43:20 P.M. Central Standard Time, alanjames@xtra.co.nz writes:

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