Use this form for calculating the Theoretical Cubic Inches Displacement Per Shaft Revolution (C.I.R) of a pump by measuring its internal parts. Make all measurements in inches, as accurately as possible. Convert fractional dimensions into decimal equivalents.

Displacement from Measurements Pump/Motor Type: Gear Vane Gear Width (W): Gear Bore Dia. (D): Bore to Bore (L): Displacement (CIR)   =    _________

Formula for Gear Pumps: CIR = 6*W*(2*D-L)*(L-D)/2 Formula for Vane Pumps: CIR = 12*W*(L+D)/4*(L-D)/2