Reply To: 88 cu ft Tank and the amount of fills I should get with my Crown

Forums Air Tanks, Pumps, Compressors, & Filters 88 cu ft Tank and the amount of fills I should get with my Crown Reply To: 88 cu ft Tank and the amount of fills I should get with my Crown

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Eaglebeak
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Spray1Mark

In the UK it's Liters with air but the math is very simple.

So 88 CUFT= 3.1L 300 bar is 4500 PSI etc. etc.

3.1L X 300BAR=930L-140BAR X 3.1L=434 (930-434)=496L USEABLE AIR (tank full volume minus the pressure when you get it refilled)

480CC X 245BAR=117L-480CC X 145BAR=70L, 117-70=47L per fill so you should get 10.5 fills (not including losses).

The fact that you are getting more means either the dive shop is filling the bottle to over 300 or you have an incorrect gauge (probably the gun). FX gauges have been reported to be upto 50 bar out on some occasions, 10-20 is probably much more common.

Hope that makes at least some sense!

Sorry Spray1Mark, but your equation doesn't make any sense. 88 CUFT= 2492 litres. The Imperial volume in cubic feet is the pressurised capacity of the bottle and depends on what pressure the tank is rated for. The litre capacity is the amount of liquid that the tank can hold. A 9 litre tank at 300 bar or 4300 psi has a pressurized capacity of roughly 88 cubic feet.