Pressure Loss & Pump Selection

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Input Data

Enter your project data

System Type

Select your system type for optimized pump selection

Flow Input

Enter the flow directly, or let it be calculated from the heat load and ΔT (Q = P / (ρ · cp · ΔT)). Only the inputs of the selected way are shown and used.

Diameter Source

"Recommend from Flow" sizes the pipe automatically (same verified velocity/friction-rate targets as the Pipe DN Recommendation calculator) instead of using the Pipe Diameter field below — useful when you only know the heat load and want the diameter suggested, not just checked.

Pipe Material (for Auto-Size)

Used only when "Diameter Source" above is set to Recommend from Flow / Heat Load

Hazard Class

NFPA hazard classification

Flow Rate (m³/h)

Total flow rate through the pipe

Pipe Length (m)

Total pipe length including equivalent length for fittings

Pipe Inner Diameter (mm)

Internal pipe diameter (not nominal DN)

Pipe Roughness (mm)

Steel: 0.045mm, PVC: 0.0015mm, Copper: 0.0015mm

Fluid Temperature (°C)

Heating: 70-80°C, Cooling: 5-12°C, DHW: 60°C

Heat Load (kW)

Optional: Calculate flow from heat load and ΔT

Temperature Difference (°C)

ΔT for heating/cooling systems (typically 20°C for heating, 5-10°C for cooling)

Building Height (m)

Total building height from suction to highest fixture

Number of Floors

Total number of floors served

Total Fixture Units (FU)

Hunter's method: Total fixture units for flow calculation

Well Depth (m)

Total well depth from surface

Static Water Level (m)

Water level when pump is OFF (from surface)

Dynamic Water Level (m)

Water level when pump is RUNNING (from surface)

Drawdown (m)

Static - Dynamic water level (auto-calculated if empty)

Drainage Area (m²)

Area to be drained (roof, basement, etc.)

Rainfall Intensity (l/s/m²)

Local rainfall intensity (typical: 0.03-0.05 l/s/m²)

Max Solid Particle Size (mm)

Maximum solid particle size pump must handle

Design Density (mm/min)

NFPA required density (Light: 2.25, Ordinary: 5.0, Extra: 8.0+ mm/min)

Coverage Area (m²)

Area covered by sprinkler system

Fluid Density (kg/m³)

Water: 1000 kg/m³ (auto-adjusted by temperature)

Dynamic Viscosity (Pa·s)

Water at 20°C: 0.001 Pa·s (auto-adjusted by temperature)

90° Elbows (pcs)

Number of 90 degree elbows

Valves (pcs)

Gate or ball valves

Tees (pcs)

Number of tee fittings

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Calculation Results

Calculated instantly from your inputs

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Pressure Loss & Pump Selection

This calculator determines pressure loss in piping systems and recommends the optimal pump based on your system type. Supports heating/cooling circulation, pressure boosting, submersible, drainage, and fire fighting applications.

Key Points:

Darcy-Weisbach with Colebrook-White friction factor
System-specific pump recommendations
NPSH calculation for submersible pumps
Multi-pump configuration suggestions
Real-time system curve visualization

Calculation Steps:

Enter all required parameters
Click "Update Calculation"
Review results and analysis

Formula Variables:

ΔP Pressure Loss (Pa)

f Friction Factor (-)

L Length (m)

D Diameter (m)

ρ Density (kg/m³)

V Velocity (m/s)

ε Roughness (m)

Re Reynolds (-)

H System Head (m)