# Compressed Gas or Air - Storage Volume

## Calculate the storage volume of compressed gas or air

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

pa Va = pc Vc                                                      (1)

where

pa = atmospheric pressure (14.7 psia, 101.325 kPa)

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

pc = pressure after compression (psi, kPa)

Vc = 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)

Va = pc Vc / pa                                                     (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 air volume in a 1.76 cubic feet K-type cylinder at 2200 psig (2214.7 psia) can be calculated

Va = (2214.7 psia) (1.76 cu ft) / (14.7 psia)

= 265 (cu ft)

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