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Plant Engineering Calculator

Pump Minimum Flow Recirculation Calculator — Bypass Flow, kW & Heat

Calculate required bypass flow when process demand falls below a pump minimum-flow limit and estimate recirculation hydraulic power.

Inputs

Results

Required bypass 15.00 L/s
Hydraulic recirculation 7.35 kW
Input equivalent 9.81 kW
Process share 62.5 % of minimum

Formula

Qbypass=max(0,Qmin−Qprocess); Phyd=ρgQbypassH.

Worked example

A pump requiring 40 L/s minimum with 25 L/s process demand needs 15 L/s recirculation.

Assumptions & limits

  • Minimum stable/thermal flow must come from the pump OEM or validated engineering basis.
  • A bypass protects the pump but can waste energy and heat the fluid.

FAQs

What does this Pump Minimum Flow Recirculation Calculator calculate?

Calculate required bypass flow when process demand falls below a pump minimum-flow limit and estimate recirculation hydraulic power.

Is this suitable for final design?

Use it for transparent engineering screening and diagnostics. Verify final design or operating changes against measured site data, OEM curves and applicable standards.

Why are assumptions shown?

Plant calculations depend on operating boundaries. Explicit assumptions make scenarios auditable and prevent false precision.

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Last updated: 17 September 2026