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#1
11-15-2011, 05:02 PM
 Crayber Junior Member Join Date: Nov 2011 Posts: 2 Rep Power: 0
Volume of Air Under Pressure

I have a 1000Lt Compressed Air Receiver at 8Bar. How many liters of air is contained within the vessel.

Please may someone help me with a formula for this as I have different size vessels at different pressure to work out.

Thanks

Last edited by Crayber; 11-15-2011 at 05:28 PM. Reason: additional info
#2
11-15-2011, 06:05 PM
 HerrWarum Supreme Member Join Date: May 2011 Location: MD, USA Posts: 303 Rep Power: 3
Re: Volume of Air Under Pressure

Here's a start
http://en.wikipedia.org/wiki/Ideal_gas_law
#3
11-16-2011, 02:44 PM
 Crayber Junior Member Join Date: Nov 2011 Posts: 2 Rep Power: 0
Re: Volume of Air Under Pressure

Thank You HerrWarum

Unfortunately the page you sent me to is very complicated to the untrained eye.

Does anybody know of a simplified version. I only need to know the volume (in liters or cubic meters) of air stored in a 1000Lt Air Vessel which is pressurized to 8Bar.

my end result is the time it takes to release that volume of air if released at 370Lt/min.
#4
11-16-2011, 03:37 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,434 Rep Power: 12
Re: Volume of Air Under Pressure

Assuming it is being released at the same temperature it is stored at, you have a 1000L vessel at 8 Bar. You will eventually end up with 1000L left at 1.01 bar. (call it 1 bar).

Assuming you can control the release rate fairly precisely, you want to know how much time it takes to get from 8bar to 1 bar.

Probably the easiest way of understanding this for your future reference is to ask yourself "If all my air was originally at 1 bar, how many 1000L containers would this occupy?" - As air pressure is almost directly proportional to content, the answer is about 8 1000L cylinders. (8000L)

So your question is really, how long will it take to use up 7000L at the rate of 370L/min?

7000/370 = about 18 or 19 minutes.

* this only applies to gases that obey the ideal gas law, air more or less does, as long as it is fairly dry.

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