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Re: Question
OK, I hadn't gone through all the work to figure out the PSIG/foot of depth of water, but everyone seems to be talking thousands of PSI, not the hundreds involved in what a reasonable sub would goto.. If I built a test fixture for my boat (sub) to simulate a trip to 400 feet I would only need to presurize it to 200psi? I can build a tank that will handle 200psi for testing... Especially a 200psi rig for testing of windows. I'm dumbfounded, If it's really the thousands of PSI I was thinking of.
Well onto list material :) What testing rigs have you developed, and do any of you want to describe them or publish plans for them.
*********** REPLY SEPARATOR ***********
On 8/7/99, at 12:02 PM, Paul Suds wrote:
>Charlie, I would highly recommend a scuba class. They cover Boyles, law,
>Charle's law, and Dlaton's law. Fresh water density is 62.3164 lb/ft2 at 20
>degrees C. Saltwater is ~64lb/ft2. Divide by 144 (12inches x 12 inches), and
>you get 0.43 psi/ft for fresh water and 0.44 psi/ft for salt water. Rule of
>thumb that keeps you safe is: half the depth to give you psi. Example: in
>100 ft of H2O, you have 50 psig of pressure, even though it's actually 43 to
>44 psig. The "g" in psig is gauge pressure. That means if the pressure gauge
>on the surface measures 0 psi, then it would read 50 psi at 100 ft of water.
>Psia is absolute pressure. We currently have 1 atmosphere, or 14.696 psi of
>pressure from the air over our heads. Hope this helps,
>Paul
>
>
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