Re: RE: [PSUBS-MAILIST] Isn't 'Mini book review.' anymore--pressure test

[SFreihof@aol.com]

From: Alec Smyth <Asmyth@changepoint.com
snip>>
I'm getting into an area here that I don't know much about. But no, I'm not talking about a stress gauge. I'm referring to a thin tube that allows you to track air flow out of the hull as the hull compresses. I have not seen this done, but I've read somewhere that's how they do it. 
<<snip


This sounds very similar to the method used for hydrostatic testing of scuba cylinders.  The scuba tank is filled with water and placed in a water-filled pressure chamber.  Water is used so if the scuba tank ruptures, it will not explode because water is not compressible.  As pressure is applied into the scuba cylinder, the scuba tank will expand and displace water in the test chamber.  This displaced water rises in a tube and is used to gauge the expansion of the scuba tank under pressure.  What you're referring to is a method to conversely gauge the compression of the pressure hull.  Sounds like a good idea to me.

Stan
2 man Ambient Dry
Ft. Lauderdale