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AG-04 / AUTIXON ENGINEERING

Pump & TDH Sizing

Calculate preliminary TDH, friction, hydraulic, shaft and electrical power.
USER INPUT

Calculation inputs

Saved locally

Empty fields are never replaced with invented agronomic values. Results update only from visible data.

Pipe and losses

Efficiencies and operation

METHOD / TRACEABILITY

Visible formulas and assumptions

HMT = hauteur statique + pression + pertes | Ph = ρgQH | Parbre = Ph/ηpompe | Pélec = Parbre/ηmoteur
  • ρ = 1 000 kg/m³; g = 9,80665 m/s²; 1 bar = 10,1972 mCE
  • User-entered friction loss.
  • Preliminary sizing: confirm the duty point against the manufacturer curve and detailed minor losses.
PROJECT PROGRESSION→ SOLAR
AUTIXON / SOLAR PUMPING

Design the pump’s solar power system

Complete flow, TDH, motor power and pumping hours before transfer.

PUMP SIZING REQUIRED
Engineering reference

Irrigation Pump Sizing, TDH & Power Calculator

Calculate required flow, total dynamic head, hydraulic power, shaft power and electrical input for an irrigation pump.

Calculation method

TDH combines static lift, outlet pressure and entered component losses. Friction is user-provided or estimated with the visible Hazen–Williams inputs; efficiencies convert hydraulic power to shaft and electrical power.

Formulas used

  • TDH = static head + pressure head + friction + component losses
  • Hydraulic power = ρ × g × Q × TDH
  • Electrical power = hydraulic power / (pump efficiency × motor efficiency)

Worked example

At 4 m³/h and 53.4 m TDH, hydraulic power is about 0.58 kW; at 70% pump and 90% motor efficiency, input is about 0.92 kW.

How to interpret the result

Select a real pump from its curve near the duty point; the calculated power is a requirement, not a commercial motor selection by itself.

Common mistakes

  • Using well depth as dynamic water level.
  • Omitting filter and valve losses.
  • Applying peak efficiency away from the duty point.

Scope and limitations

  • This is preliminary steady-state sizing, not a pump-curve, transient or water-hammer simulation.

Frequently asked questions

What is TDH?

Total dynamic head is the total energy per unit weight the pump must add at the design flow.

Why is electrical power higher than hydraulic power?

Pump and motor losses require more input power than the useful hydraulic output.

Can I send the result to Solar Engineering?

Yes. The tool can transfer the calculated flow, TDH and power to the solar-pumping workflow.