SCFM to ACFM Conversion Formula

[santhosh]

we are using Absolute Pressure Pa in the formula,
say if we have Gauge Pressure Psig, then we need to add this constant to get pressure in Pa

Read the following article -

Difference between Atmospheric Pressure and Gauge Pressure

Atmospheric pressure is the pressure exerted by the atmosphere on the earth’s surface. This pressure will vary with altitude, but is normally assumed at 14.7 psia, the value at sea level. Gauge pressure is the pressure of a closed system measured by gauge. This pressure excludes the effects of atmospheric pressure.