Whitepaper: Select the Right Pump before Errors Get Costly

27.10.2026
Seven pump selection errors that stay invisible at quote time – from NPSH margins to viscosity correction. The free VSX whitepaper “Best Practices for Avoiding Hydraulic Pump Selection Errors” shows engineering and sales teams how to spot them early, what they cost and which standards apply. Includes an 8-point pre-selection checklist.
Whitepaper: Select the Right Pump before Errors Get Costly

Image source: VSX - VOGEL SOFTWARE GmbH

The datasheet looks right, the duty point matches and the order goes through. The problems only show up months later, as cavitation, an overheating motor, clogged impellers or energy bills well above plan.

The seven errors at a glance

  • NPSH margins: why the minimum often isn’t enough
  • Booster oversizing: the costly safety factor
  • Motor thermal derating: what happens at high ambient temperatures and altitudes
  • Sewage pump sizing: choosing the right impeller for ragging-prone media
  • Operating point drift: when the real system curve differs from the plan
  • Viscosity correction: an error that is often overlooked with non-water media
  • Parallel pump selection: the trap in the combined curve

Grounded in practice

The authors are application engineers who selected pumps at manufacturers before they started writing selection software. Two case studies show what correct selection achieves. In one, a high-rise booster replacement cut energy use by 28 percent. In the other, a municipal lift station ended its monthly de-ragging after an impeller change.

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