# Compressed Gas and Air - Storage Volumes

## Calculate the storage volume of compressed air or gas

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

p_{a}V_{a}= p_{c}V_{c}(1)

where

p_{a}= atmospheric pressure (14.7 psia,101.325 kPa)

V_{a}= volume of the gas at atmospheric pressure (cubic feet, cubic meter)

p_{c}= compressed pressure (psi,kPa)

V_{c}= volume of the gas at compressed pressure (cubic feet, cubic meter)

### Volume of free gas in a Storage Volume

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

V_{a}= p_{c}V_{c}/ p_{a}(2)

Gas can be stored in high-pressure cylinders ranging to *6000 psig (410 bar)*, normal-pressure cylinders ranging between *2000 and 2500 psig (140 and 175 bar) *and low-pressure cylinders ranging up to *480 psig (34 bar).*

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

The standard atmospheric air in a *1.76 cubic feet *K-type* *cylinder at *2200 psig (2214.7 psia) *can be calculated as:

V_{a}= (2214.7 psia) (1.76 cu ft) / (14.7 psia)

= 265 (cu ft)

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