Re: OT: Cubic Feet in a Compressed Gas Cylinder?

--- In CAD_CAM_EDM_DRO@egroups.com, "Tim Goldstein" <timg@k...> wrote:

> Totally off topic, but I though someone on the list might know how

to figure

> this.
>
> I am looking to be able to calculate the number of cubic feet of

gas at

> standard atmospheric pressure that are in a cylinder at any given

time. The

> 2 scenarios are:
>
> If I know the rated capacity of a cylinder at a given pressure How

do I

> calculate the remaining cubic feet at a different pressure. As an

example,

> if I have a cylinder that is rated to hold 219 cubic feet at 2080

psi, how

> many cubic feet does it hold at 500 psi or any other pressure?
>
> If I know the internal volume of a cylinder how can I calculate the

capacity

> in cubic feet at 100 psi? As an example, if I have a cylinder that

has a

> calculated internal volume of 3.5 cubic feet, how much gas can it

hold at

> 100 psi.
>
> TIA,
>
> Tim
> [Denver, CO]

The following was taken from a FESTO catalog.

As Boyle-Mariotte's law says that P1*V1=P2*V2=P3*V3...

As a exemple:A volume V1=1m3,under P1=100Kpa(1 bar)is compressed to
V2=0.5m3 keeping a constante temperature;
P1*V1=P2*V2
P2=P1*V1/V2
P2=100Kpa*1m3/0.5m3 =200Kpa.(2 bar)
keep in mind that gas pressure changes with the temperature.
It should work with U.S measuring system.