The actual CFM of a compressor operating at "non-standard" conditions like
can be calculated as
ACFM = (100 SCFM) [(14.7 psia) / ((12.23 psia) - (0.5069 psia) (80 / 100))]((540 o R ) / (520 o R))
Inlet Cubic Feet per Minute - ICFM - is used by compressor vendors to establish conditions in front of additional equipment like inlet filter, blower or booster.
When air passes through the filter there will be a pressure drop. The conversion from ACFM to ICFM can be expressed as
ICFM = ACFM (P act / P f ) (T f / T act ) (2)
ICFM = Inlet Cubic Feet per Minute
P f = Pressure after filter or inlet equipment (psia)
T f = Temperature after filter or inlet equipment ( o R)
The Ideal Gas Law is accurate only at relatively low pressures and high temperatures. To account for the deviation from the ideal situation, another factor is included. It is called the Gas Compressibility Factor, or Z-factor . This correction factor depends on the pressure and temperature for each gas considered.
The True Gas Law, or the Non-Ideal Gas Law, becomes:
P V = Z n R T (3)
Z = Gas Compressibility Factor
n = number of moles of gas present
Air volume conversion factors related to air with temperature 70°F (21.1°C) :
Air, LNG, LPG and other common gas properties, pipeline capacities, sizing of relief valves.
Yearly power cost for operating an air compressor.
Inlet pipe size and maximum air flow.
Elevation above sea level and air temperature, pressure and density.
Air consumption of air tools.
Elevation above sea level - in feet and meter - with barometric and atmospheric pressure - inches mercury, psia, kg/cm2 and kPa.
Relative humidity in moist air is the ratio of partial vapor pressure to air pressure.
The van der Waals constants for more than 200 gases used to correct for non-ideal behavior of gases caused by intermolecular forces and the volume occupied by the gas particles.
Common rating terms for air flow capacity are ICFM, FAD, ANR, SCFM or nl/min.
The relationship between volume, pressure, temperature and quantity of a gas, including definition of gas density.
Calculate specific work done by pumps, fans, compressors or turbines.
Reciprocating, rotary screw and rotary centrifugal air compressors.
Calculate pressure drops in vacuum pipe lines.
Online calculator, figures and tables giving the boiling temperatures of water in varying vacuum, SI and Imperial units.
Online calculator, figures and tables with water saturation (vapor) pressure at temperatures ranging 0 to 370 °C (32 to 700°F) - in Imperial and SI Units.
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