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OK, I'll bite.
The absolute pressure at 245 feet is approximately:
245/33 + 1 = 8.4ATM
Assuming an IP of 150PSI, the regulator will stop delivering air somwhere
around:
8.4 x 14.7 + 150 = 275PSI
Assuming linear compression of the gas, and a luxfer Al80, the gas available
in the drop from 1200 to 275PSI is:
(1200 - 275)/3000 * 77.4 = 23.9cuft
Given a surface consumption of .7 cuft/min, gas consumption at depth would be:
8.4 x 0.7cuft/min = 5.9cuft/min
Looks to me to be about 4 minutes. Personally, I would be tempted to add a
safety factor.
That was fun, I actually got to use my calculator today.
Cheers
David
In message "Formula", bcolman@gt*.ne* writes:
> =09
> Can anyone help me out...
>
> At 245 FSW, there is 1200 PSI in a 80Cu.Ft Cylinder, if the divers
> gas consumption is .7ft/min, how long will it last..?? I cant seem
> to find the right formula..??
> =20
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