As the pressure is already in PSI then
the force (pounds) pushing your plug out of the 1/4" leak is the
219 or 275 pounds not PSI. whatever the math is (I didn't figure
it out) but you have to apply that many pounds not psi.
Jay. (B)
Jon Wallace <jon@psubs.org> Sent by: owner-personal_submersibles@psubs.org
2009-01-06 17:11
Please respond to
personal_submersibles@psubs.org
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Subject
Re: [PSUBS-MAILIST] Soft ballast venting
valve
Thanks for that Jay. The 125 pound figure didn't sound right to me
either and I calculated a pressure of 275.125 pounds for a square 1/4
tube, but was too lazy to look up the formula for a 1/4 round tube.
Jon
Jay K. Jeffries wrote:
>
> Some notes on this discussion:
>
> 1. I have had the opportunity to spend some time in a US Navy
> submarine damage control simulator as part of a team that took on
a
> series of leaks. With a team, a lot more room than found in a PSUB
> (even a large one), proper damage control response resources, and
cold
> water under pressure, we were hard pressed to stop a variety leaks
> that would be encountered aboard a submarine. It was very stressful
> but someplace in the back of your mind you knew that it wasn’t real,
> there was a hot shower waiting for you, and there would definitely
be
> at least a cold beer at the end of the day. Aboard a typical PSUB,
> there has been little if any previous damage control training, there
> are few resources available to combat a leak, reserve buoyancy is
at a
> premium, you probably don’t have someone to assist in combating the
> casualty, and it is VERY cramped.
>
> 2. The actual pressure behind a ¼” leak at 10,000 fsw:
> 1 fsw = 0.445 psi therefore 10,000 fsw equals 4450 psi.
> The area of a circle (A) equals π times the radius squared, where
the
> radius in this case equals 0.125” resulting in an area of 0.0491
in.^2
> Therefore the pressure through our ¼” tube at 10,000 fsw equals (4450
> x 0.0491) ~219 psi.
>
> 3. A hatch that is leaking in shallow water may not stop leaking with
> an increase in depth as the inflow of water disrupts the seating pressure.
>
> Later,
>
> Jay
>
> Respectfully,
>
> Jay K. Jeffries
>
> Andros Is., Bahamas
>
> */As scarce as the truth is, the supply has always been in excess
of
> the demand./*
>
> -Josh Billings
>
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