Hydraulic Designer

Cylinder, pump and valve sizing for a hydraulic circuit.

🔧 Hydraulic System DesignerDesign hydraulic systems with cylinder, pump, and pipe sizing calculations
System ParametersSystem Pressure (bar)
Flow Rate (L/min)
Hydraulic Fluid
Fluid Temperature (°C)
CylinderBore Diameter (mm)
Rod Diameter (mm)
Stroke (mm)
PipingPipe Material
Inner Diameter (mm)
Total Length (m)
90° Elbows 
45° Elbows 
Tees 
Valves 
Filters 
Pump & MotorPump Displacement (cc/rev)
Pump Speed (RPM)
Pump Efficiency (%)
Motor Efficiency (%)
Flow AnalysisFlow Velocity
2.35m/s
Reynolds Number
1060.65
Flow Regime
Laminar
Friction Factor
0.06
Viscosity @ T
36.86cSt
K-Total (Fittings)
8.70
Pressure LossesPipe Losses
0.77bar
Fitting Losses
0.21bar
Total ΔP
0.98bar
Pressure Efficiency
99.51%
Cylinder PerformanceExtend Force
100.53kN
Retract Force
75.40kN
Extend Speed
132.63mm/s
Retract Speed
176.84mm/s
Extend Time
2.26s
Retract Time
1.70s
Bore Area
5026.55mm²
Annulus Area
3769.91mm²
Power RequirementsHydraulic Power
13.33kW
Pump Input
14.49kW
Motor Power
15.58kW
Heat Generated
1.22kW
System SizingPump Flow (Theor)
40.60L/min
Pump Flow (Actual)
37.35L/min
Reservoir Min
112.06L
Reservoir Rec'd
149.41L
Pressure Drop BreakdownLoss contributions by component
Flow vs Pressure DropSystem pressure loss curve
Design Guidelines• Flow Velocity: Pressure lines: 3-6 m/s, Return lines: 2-4 m/s, Suction lines: < 1.2 m/s
• Pressure Drop: Keep total system ΔP < 10% of working pressure for efficiency.
• Oil Temperature: Optimal 40-55°C. Above 65°C accelerates seal/oil degradation.
• Reservoir Sizing: 3-5× pump flow rate. Include cooling if heat > 1.5kW.
• Rod/Bore Ratio: Common ratios: 1:1.4, 1:1.6, 1:2 for balanced extend/retract speeds.
• Pump Selection: Size for 90% of theoretical flow; account for volumetric efficiency losses.

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🔧 Hydraulic System DesignerDesign hydraulic systems with cylinder, pump, and pipe sizing calculations
System ParametersSystem Pressure (bar)
Flow Rate (L/min)
Hydraulic Fluid
Fluid Temperature (°C)
CylinderBore Diameter (mm)
Rod Diameter (mm)
Stroke (mm)
PipingPipe Material
Inner Diameter (mm)
Total Length (m)
90° Elbows 
45° Elbows 
Tees 
Valves 
Filters 
Pump & MotorPump Displacement (cc/rev)
Pump Speed (RPM)
Pump Efficiency (%)
Motor Efficiency (%)
Flow AnalysisFlow Velocity
2.35m/s
Reynolds Number
1060.65
Flow Regime
Laminar
Friction Factor
0.06
Viscosity @ T
36.86cSt
K-Total (Fittings)
8.70
Pressure LossesPipe Losses
0.77bar
Fitting Losses
0.21bar
Total ΔP
0.98bar
Pressure Efficiency
99.51%
Cylinder PerformanceExtend Force
100.53kN
Retract Force
75.40kN
Extend Speed
132.63mm/s
Retract Speed
176.84mm/s
Extend Time
2.26s
Retract Time
1.70s
Bore Area
5026.55mm²
Annulus Area
3769.91mm²
Power RequirementsHydraulic Power
13.33kW
Pump Input
14.49kW
Motor Power
15.58kW
Heat Generated
1.22kW
System SizingPump Flow (Theor)
40.60L/min
Pump Flow (Actual)
37.35L/min
Reservoir Min
112.06L
Reservoir Rec'd
149.41L
Pressure Drop BreakdownLoss contributions by component
Flow vs Pressure DropSystem pressure loss curve
Design Guidelines• Flow Velocity: Pressure lines: 3-6 m/s, Return lines: 2-4 m/s, Suction lines: < 1.2 m/s
• Pressure Drop: Keep total system ΔP < 10% of working pressure for efficiency.
• Oil Temperature: Optimal 40-55°C. Above 65°C accelerates seal/oil degradation.
• Reservoir Sizing: 3-5× pump flow rate. Include cooling if heat > 1.5kW.
• Rod/Bore Ratio: Common ratios: 1:1.4, 1:1.6, 1:2 for balanced extend/retract speeds.
• Pump Selection: Size for 90% of theoretical flow; account for volumetric efficiency losses.