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JUHA FLINKMAN wrote:
>
> (SNIP)
> I'm not really familiar with the american system of expressing the
> tank sizes in cuft at working pressures, that are usually _not_
> mentioned.
>
Life would certainly be easier if we (the US) adopted the metric system.
Although awkward at first, many tasks, such as making a diving gas
estimate, are a lot easier if you know the water capacity of the
cylinder in litres. I've been able to do some estimates without the
need for a calculator...
And this brings me to a question I'd like to pose to the non-US
members of the list. There are several tanks that are available in
the US that are not sold in many countries. The notable ones that
some of my UK friends and colleagues have mentioned to me are the
Sherwood Genesis and US Divers HP tanks. When communicating with them
I have converted the US designations in cubic feet (CF) to water
capacity (WC) in liters using:
rated CF
WC = --------------------------- x 28.3
((rated PSIG + 14.7) / 14.7)
This works if we allow the assumption that one bar and one atmosphere
are the same, which is commonly done here in the US. The question is,
does this assumption cause the results to differ enough from the true
water capacity (or better, the manufacturer's >reported< WC), such that
it might cause confusion? By this formula, some converted values are:
AL80 @ 3000 PSIG -> 11.0 L (luxfer)
GEN80 @ 3500 PSIG -> 9.5 L (pressed-steel)
OMS125 @ 2640 PSIG -> 19.5 L (faber?)
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Greg Dawe Raptor Systems http://www.raptor.com
gdawe@ra*.co* (888)-RAPTOR1 (617) 890-6532 (FAX)
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