Engineering editorial · Updated 2026-09-18
The short answer
Required head combines elevation difference, pressure difference and flow-dependent losses along the circuit.
What to check
For a closed filled loop, elevation gains and losses balance around the circuit; resistance remains. List pipe lengths, diameters, fittings and components, then check the system curve.
Make the comparison meaningful
Record supply voltage, medium temperature, circuit arrangement and the measurement location. Compare candidate pumps under the same conditions. Maximum flow, maximum pressure and a single noise value do not describe a complete working point.
Before you choose a model
Ask for the current specification, performance curve and approved operating limits for the exact variant. Agree on the test method and acceptance criteria, then validate a sample in your equipment. This guide describes selection principles, not verified performance for a Shan Neng model.