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Pump Selection Prep

Prepare a pump duty point, check the basic piping assumptions, then use official manufacturer tools for curve-backed selection.

WorkflowpumpsPublishedLast reviewed: 2026-05-25

Decision Path

  1. Convert pressure requirements to liquid head
  2. Estimate straight-pipe pressure loss
  3. Open the curated pump selection tools

Pump selection starts with a defensible duty point. Use this workflow to collect flow, head, fluid, and installation information before opening a manufacturer selector.

What This Helps You Decide

This workflow helps decide whether you have enough information to use a manufacturer pump selection tool and which site checks should happen first. It is useful when you know the required flow and have a preliminary piping layout, pressure target, or head estimate.

Final pump selection depends on manufacturer curves, product-specific performance data, available configurations, fluid compatibility, materials, motor options, and NPSH requirements. Eng Calculators has not independently validated vendor tool outputs.

Inputs To Collect Before Opening A Vendor Tool

  • Design flow rate at the main duty point.
  • Static elevation difference and required discharge pressure or head.
  • Pipe length, diameter, fittings, valves, and expected pressure losses.
  • Fluid, temperature, density or specific gravity, and viscosity.
  • Suction conditions, available pressure, vapor pressure, and NPSH available when known.
  • Power supply, materials, seals, connection type, installation limits, and duty cycle.

Site Sanity Checks Before Vendor Selection

  • Use Pump Head From Pressure when a pressure requirement must be converted to head for a specific liquid density.
  • Use Darcy-Weisbach Pressure Loss to estimate straight-pipe pressure loss when pipe length, diameter, velocity, density, and friction factor are known.
  • Use Pipe Velocity From Flow Rate to check whether a proposed pipe size gives a plausible velocity before product selection.
  • Read Pump Head Basics when the distinction between pressure, head, elevation, and losses is not clear.

When To Use Manufacturer Selection Software

Use official manufacturer software after the basic duty point and fluid assumptions are organized. Manufacturer tools are the right place to compare curves, efficiency, NPSH requirements, motor loading, materials, controls, and available configurations.

For current provider tools and disclosure notes, use the Pump Selection Tools directory.

Cautions

  • A selected pump should be checked against its curve, preferred operating region, minimum flow, motor limits, and NPSH margin.
  • Viscous, hot, corrosive, aerated, or solids-bearing fluids may require manufacturer review or application support.
  • A single duty point may not represent startup, turndown, fouling, control-valve, or parallel-pump conditions.
  • Vendor tools use provider data and assumptions; review the output instead of treating it as an independent engineering check.

Sources

  • White, Fluid Mechanics, 7th ed., for pump head and fluid-mechanics context.
  • Crane TP-410, 2009, for practical pipe-flow and pump-system head context.