Pressure Spike

Hydraulic Calculator

Pascals Law(F = P x A) - Pressure applied on a confined fluid is applied equally, in all directions, with equal force on all equal areas

Pressure(psi) Area(in2) Force(lbs) =

Force(lbs) Area(in2) Pressure(psi) =

Force(lbs) Pressure(psi) Area(in2) =

Calculate area of a cylinder(Area = diameter2 x .7854)

Diameter(inches) Area(in2) =

Calculate annular area of a cylinder(Bore - Rod Area)

Bore Diameter(inches): Rod diameter(inches): Annular Area(in2) =

Cylinder Velocity formulas

Find velocity for a cylinder(Velocityin/min = Strokein x (60sec/min / Timesec)

Stroke(inches): Time(sec): Velocity(in/min) =

Find cylinder velocity(Velocityin/min = (Flowgpm x 231) / Areain2)

Flow(gpm): Area(in2): Velocity(in/min) =

Find flow requirement for cylinder extending(Flowgpm = (Velocityin/min * Areain2)/231)

velocity(in/min): Bore Diameter(inches): Flow Requirement(gpm)=

Find flow requirement for cylinder retracting(Flowgpm = (Velocityin/min * Areain2)/231)

Velocity(in/min): Diameter(inches): Rod Diameter(inches): Flow Requirement(gpm)=

Pump formulas

Calculate Horse Power

Horsepower = (Pressure x flow)/1714

Pressure(psi): Flow(gpm): Horsepower =

Calculate pump flow given displacement and rpm

Flow = Displacementcir * rpm

Displacement(cir) : Rpm: Pump Flow(gpm)=

Motor Torque Formulas

Calculate horsepower given torque and rpm

HP = (Torquelbs-ft * rpm)/5252

Torque(lbs-ft): RPM: Horsepower =

HP = (Torquelbs-in * rpm)/63025

Torque(lbs-ft): RPM: Horsepower =

Calculate Motor Torque given displacement and pressure

Torquelbs-in=(Displacementcir * Pressure)/6.28

Enter Displacement(cir): Enter Pressure(psi): Torque(lbs-in) =

Inlet Conditions

Head(Inlet pressurepsig = Specific Gravity x .433psi/ftH2O)

Understanding factors that affect fluid weight is critical for ensuring adequete pump inlet conditions.

Calculate Pressure Generated from Positive Head

Positive Head(ft): Specific Gravity: Gauge pressure generated from Positive head(psi):