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>Posted on 20 Sep 1996 at 07:40:35 by Greg Dawe

>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?)

The sources of error include (from memory):
1ATM is 0.986 bar.
An AL80 measures in at 77 cf.
And then there is the effect of the temperature.

John

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