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RE: [PSUBS-MAILIST] Soft ballast venting valve



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