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# Compressed Air - Storage Volume

The storage volume for a compressed gas can be calculated by using Boyle's Law

p a V a = p c V c = constant                                                (1)

where

p a = atmospheric pressure (14.7 psia, 101.325 kPa )

V a = volume of the gas at atmospheric pressure (cubic feet, m3 )

p c = pressure after compression (psi, kPa )

V c = volume of gas after compression (cubic feet, m3 )

### Volume of free gas in a Storage Volume

The amount of free gas at atmospheric pressure in a given volume - like a cylinder storage - can be calculated my modifying (1)

V a = p c V c / p a (2)

Gas can be stored in high-pressure cylinders ranging to more than 6000 psig (410 bar) . Normal-pressure cylinders are in the range 2000 and 2500 psig (140 and 175 bar) and low-pressure cylinders are in the range 480 psig (34 bar).

### Example - Volume of Air in a Cylinder Storage

Standard atmospheric volume of air compressed in a 1.76 cubic feet K-type cylinder at 2200 psig (2214.7 psia) can be calculated

V a = (2214.7 psia) (1.76 cu ft) / (14.7 psia)

= 265 (cu ft)

In other words - if air in a 1.76 cubic feet container is compressed to 2200 psig - the same air at atmospheric pressure will occupy 265 cubic feet .

## Related Topics

### • Gases and Compressed Air

Properties of air, LNG, LPG and other common gases. Pipeline capacities and sizing of relief valves.

## Related Documents

### Compressed Air Quality

Compressed air is used for power tools, instrumentation, processing, breathing and medical purposes.

### Compressed Air vs. Free Air - Compression Ratio

The ratio of compressed air pressure to free air pressure.

### Rating of Air Compressors and Air Equipment

Common rating terms for air flow capacity are ICFM, FAD, ANR, SCFM or nl/min.

### Types of Air Compressors

Reciprocating, rotary screw and rotary centrifugal air compressors.

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