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Re: Question
Hi,
> 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.
Could be some confusion here. 14.696 in the States means fourteen and 696
thousandths. The period is the delimeter between units and thousanths of units.
In Europe they use the period to mean the delimiter between thousands and
hundreds. So 14.696 reads fourteen thousand six hundred ninety six.
>
> 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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Regards,
Ray