Formulas
Pump Formulas
Pump Displacement (IN³/REV)
D = Q x 231 ÷ RPM
- D = Displacement (in³/rev)
- Q = Flow (gpm)
- RPM = Speed (rpm)
D = T x 75.4 ÷ P
- D = Displacement (in³/rev)
- T = Torque (ft-lb)
- P = Pressure (psi)
Pump Flow (GPM)
Q = HP x 1714 ÷ P
- Q = Flow (gal/min)
- HP = Power (hp)
- P = Pressure (psi)
Q = D x RPM ÷ 231
- Q = Flow (gpm)
- D = Displacement (in³/rev)
- RPM = Speed (rpm)
Pump Horsepower (HP)
HP = P x Q ÷ 1714
- HP = Power (hp)
- P = Pressure (psi)
- Q = Flow (gpm)
HP = P x RPM x D ÷ 395934
- HP = Power (hp)
- P = Pressure (psi)
- RPM = Speed (rpm)
- D = Displacement (in³/rev)
Pump Pressure (PSI)
P = HP x 1714 ÷ Q
- P = Pressure (psi)
- HP = Power (hp)
- Q = Flow (gpm)
P = HP x 395934 ÷ RPM ÷ D
- P = Pressure (psi)
- HP = Power (hp)
- RPM = Speed (rpm)
- D = Displacement (in³/rev)
Pump Speed (RPM)
RPM = Q x 231 ÷ D
- RPM = Speed (rpm)
- Q = Flow (gpm)
- D = Displacement (in³/rev)
RPM = HP x 5252 ÷ T
- RPM = Speed (rpm)
- HP = Power (hp)
- T = Torque (ft-lb)
Pump Torque (FT-LB)
T = HP x 5252 ÷ RPM
- T = Torque (ft-lb)
- HP = Power (hp)
- RPM = Speed (rpm)
T = D x P ÷ 75.4
- T = Torque (ft-lb)
- D = Displacement (in³/rev)
- P = Pressure (psi)
Motor Formulas
Motor Torque (FT-LB)
T = HP x 5252 ÷ RPM
- T = Torque (ft-lb)
- HP = Power (hp)
- RPM = Speed (rpm)
T = D x P ÷ 75.4
- T = Torque (ft-lb)
- D = Displacement (in³/rev)
- P = Pressure (psi)
Motor Speed (RPM)
RPM = Q x 231 ÷ D
- RPM = Speed (rpm)
- Q = Flow (gpm)
- D = Displacement (in³/rev)
RPM = HP x 5252 ÷ T
- RPM = Speed (rpm)
- HP = Power (hp)
- T = Torque (ft-lb)
Motor Horsepower (HP)
HP = T x RPM ÷ 5252
- HP = Power (hp)
- T = Torque (ft-lb)
- RPM = Speed (rpm)
HP = P x Q ÷ 1714
- HP = Power (hp)
- P = Pressure (psi)
- Q = Flow (gpm)
HP = P x RPM x D ÷ 395934
- HP = Power (hp)
- P = Pressure (psi)
- RPM = Speed (rpm)
- D = Displacement (in³/rev)
Motor Pressure (PSI)
P = T x 75.4 ÷ D
- P = Pressure (psi)
- T = Torque (ft-lb)
- D = Displacement (in³/rev)
P = HP x 1714 ÷ Q
- P = Pressure (psi)
- HP = Power (hp)
- Q = Flow (gpm)
P = HP x 395934 ÷ RPM ÷ D
- P = Pressure (psi)
- HP = Power (hp)
- RPM = Speed (rpm)
- D = Displacement (in³/rev)
Motor Flow (GPM)
Q = HP x 1714 ÷ P
- Q = Flow (gpm)
- HP = Power (hp)
- P = Pressure (psi)
Q = D x RPM ÷ 231
- Q = Flow (gpm)
- D = Displacement (in³/rev)
- RPM = Speed (rpm)
Motor Displacement (IN³/REV)
D = Q x 231 ÷ RPM
- D = Displacement (in³/rev)
- Q = Flow (gpm)
- RPM = Speed (rpm)
D = T x 75.4 ÷ P
- D = Displacement (in³/rev)
- T = Torque (ft-lb)
- P = Pressure (psi)
Cylinder Formulas
Cylinder Bore (IN)
BORE = DIA = C ÷ π
- DIA = Piston Diamaeter (in)
- C = Circumference (in)
- π = 3.14159
DIA = sqrt (F ÷ P ÷ 0.785)
- DIA = Piston Diameter (in)
- F = Force (lb)
- P = Pressure (psi)
Cylinder Piston Area (IN²)
A = DIA² x 0.785
- A = Area (in²)
- DIA = Piston Diameter (in)
A = F ÷ P
- A = Area (in²)
- F = Force (lb)
- P = Pressure (psi)
Cylinder Force (LB)
F = A x P
- F = Force (lb)
- A = Area of Piston (in²)
- P = Pressure (psi)
F = DIA² x P x 0.785
- F = Force (lb)
- DIA = Piston Diameter (in)
- P = Pressure (psi)
Cylinder Pressure (PSI)
P = F ÷ A
- P = Pressure (psi)
- F = Force (lb)
- A = Flow (gpm)
Cylinder Speed (IN/SEC)
Extend Speed
S = Q x 4.904 ÷ DIA²
- S = Speed (in/sec)
- Q = Flow (gpm)
- DIA = Piston Diameter (in)
Retract Speed
S = Q x 4.904 ÷ (pDIA² – rDIA²)
- S = Speed (in/sec)
- Q = Flow (gpm)
- pDIA = Piston Diameter (in)
- rDIA = Rod Diameter (in)
Cylinder Flow (GPM)
Q = S x DIA² ÷ 4.904
- Q = Flow (gpm)
- S = Speed (in/sec)
- DIA = Piston Diameter (in)
Cylinder Volume (GAL)
V = A x L ÷ 231
- V = Volume (gal)
- A = Area of Piston (in²)
- L = Length of Stoke (in)
V = DIA² x L ÷ 294.27
- V = Volume (gal)
- DIA = Piston Diameter (in)
- L = Length of Stoke (in)
Reservoir Formulas
Reservoir Volume (GAL)
V = L x W x H ÷ 231
- V = Volume (gal)
- L = Length (in)
- W = Width (in)
- H = Height of Oil (in)
Saddle Tank Volume (GAL)
V = DIA² x L x ÷ 294.27
- V = Volume (gal)
- DIA = Tank Diameter (in)
- L = Tank Length (in)
