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Dear namesake,

By now you must have gotten a zillion replies explaining how to
make the conversion. If that's the case, just ignore this.

Yes, the working pressure is important. When the capacity of a tank
is stated in liters, we're talking about the size of the tank. When 
it's stated in cubic feet, that's the amount of gas that can be put
in it, compressed at the working pressure.

The bigger the tank, more gas can we put in it. The higher the
pressure, more gas can we put in it. In short, these two factors - 
internal volume and working pressure - dictate the amount of gas 
that'll fit in the tank.

Let's suppose your tank's working pressure is 3000 PSI. Let's convert
this to atmospheres (or bars, for all practical purposes the same thing).
We'll do this by dividing into 14.7:

        3000 / 14.7 = 204 atm

So each liter of gas in the tank can be compressed 204 times. Since
it's an 18 liter tank, it can contain

        18 x 204 = 3672 liters

A cubic foot equals 28.317 liters, so we'll divide the compressed gas
capacity by this constant:

        3672 / 28.317 = 130 cu ft (approx.)

To make it short:

        Cu ft = Liters x Working pressure (PSI) / 28.317
                         ----------------------
                                  14.7

Or, if you're lazy:

        Cu ft = Liters x Working pressure (PSI)
                         ----------------------
                                416.26


Hope this helps.

Cheers,

Carlos




At 12:47 PM 06/02/97 -0800, carlosv@ma*.co*.br* wrote:
>Dear All,
>
>Do any of you know how to calculate how many cubic feet has a cilinder
>of X litters. I tried to find out the exchange constant but i didn't.
>
>for example: How many cubic feet has a cilinder of 18 Liters ?
>
>Is the work pressure important to make this calculation or the only
>informations i have to know are the ammount of litters or Cubic Feet
>(capacity) of the cilinder to convert and the exchange constant ?
>
>
>Best Regards,
>
>
>Carlos Vasconcellos
>CarlosV@ma*.co*.br*
>
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