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Fluid Power Information Center

Basic Pneumatic (Gas) Formulas

Formula For: Word Formula: Letter Formula:
HOW TO GET ABSOLUTE PRESSURE
from Ground Pressure
ABSOLUTE PRESSURE = GROUND PRESSURE + 14.7
PSIA = PSIG + 14.7
PNEUMATIC CYLINDER SPEED
CYLINDER SPEED(feet per sec.) = STROKE(inches)

TIME TO COMPLETE THE ABOVE STROKE(seconds)x12
Vp = S

Tx12
PNEUMATIC FLOW REQUIRED
(Average)"Q"
SCFM(avg) = Avg ft3 free air per minute required
Dp = Displacement of cylinder in ft3 per inch of stroke
S = Stroke in inches
SPM = Strokes per minute, count both in and out strokes
C = Compression ratio: Supply pressure(PSIG) + 14.7 psi

14.7 psi
SCFMavg = C x Dp x S x SPM
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