It is frequently convenient to express gas flow in terms of flow at standard conditions. This is useful for calculation purposes, or for application to flow measuring instruments.
T = Gas temperature, °R = 460 + °F
P = Gas pressure, psia
ACFM = Gas flow, actual cubic feet/minute
SCFM = Gas flow, standard cubic feet/minute
EXAMPLE: What is SCFM corresponding to 0.032 ACFM at 300 psia and at 240°F?