Psi Scuba

Psi Scuba
If I have a 80 cu ft 3000psi scuba tank and I use to fill a 72 cu in 3000 psi tank what is left in the scuba?

I bought a 80 cubic foot 3000 psi aluminum scuba tank and I'm going to use it to fill a 72 cubic inch tank for paintball gun. After filling the smaller tank one time how much pressure should be in each of the tanks? I am using a device that will allow the pressure in each to equalize which will fill the smaller tank.

Starting with the math:

An 80 Cft tank would be 12 x 12 x 80 = 11,520 Cubic Inches. If you multiply that by 3000 psi, you get 34,560,000.

The new combined volume the gas will occupy is 11,592 (11520 plus 72) . So, 34,560,000 divided by 11,592 means that each tank will be about 2981 psi.

That is the theory -- the actual will be somewhat different. Why? As you transfer the gas, the temp in both containers will change and that will change pressures. Second, the hose will contain some gas and, after you equalize pressure in both cylinders, you will clsoe them leaving a pressurized fill hose. You will then ven some of that air.

All of that said:
a) Be certain the 72 inch cylinder is rated to at least 72 psi, that it is within hydro, has been inspected and is in very good condition (i.e., nothing other than purely cosmetic issues). Verify that the fill rate you are considering does not exceed the manufacturer specs.
b) Fill the tank super slowly. I would probably do that by hooking the two to the hose. Open the big tank but keep the small tank closed. Close the big tank. Slowly open the small tank. This will let some of the air in the hose into the small tank. Close the small tank. Repeat as needed.
c) Ideally, keep the small tank submerged in a container of water. This will help keep it cool.
d) Exploding scuba tanks can be lethal -- this is not something to fool around with.

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The temperatures in Akumal range around 80 degree during September to April and during the rest of the year you can expect 90 degree temperatures. The area receives a gentle sea breeze from the nearby Caribbean and during the winter season you may require a sweater in the evenings.

The local dive shop will setup your equipment and have it ready for your dive when you arrive at the dock. They have all the necessary diving equipment you will need at reasonable rental rates. You will be provided with an 80 cu. Ft aluminum tank which is filled to approximately 3000 psi. You will board one of the 28 foot open panga boats docked nearby. The dives are generally limited to eight people plus the dive master and the ships captain. Should you happen to be part of a larger group you can easily make special arrangements for all members to dive.

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M Gravlee is a retired newspaper publisher who spends several months a year traveling. He has visited every continent except Antarctica and over 30 countries.

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