Pump, Compressor & Rotating Equipment Assembly worked example

Motor Sizing with load flow or torque demand of 250 units: a worked example in pump, compressor & rotating equipment assembly

Push load flow or torque demand up to 250 units and the picture changes. This example computes every intermediate figure at that operating point. Use it when motor sizing in pump, compressor and rotating equipment assembly needs a few factors combined into one defensible number for pump, compressor and rotating equipment assembly.

The inputs for this scenario

  • Load flow or torque demand: 250 units (raised for this scenario; the documented default is 100)
  • Operating factor (head, pressure or duty): 4 units (unchanged)
  • Unit-conversion constant to motor power: 0.01 x (unchanged)
  • Service factor / efficiency multiplier: 1 x (unchanged)

Working through the calculation

  • Applying the documented formula (Motor Sizing = first factor × second factor × conversion factor × process multiplier) to the inputs above produces each figure below.
  • At this operating point the engine returns 5 units for result, the number this scenario is built around.
  • At this operating point the engine returns 5 value for base product.
  • At this operating point the engine returns 1 x for multiplier.
  • At this operating point the engine returns 1,000 value for factor a x b.

How this compares with the baseline

  • Against the tool's baseline example, where load flow or torque demand sits at 100 units and the headline result is 2 units, this scenario comes in 150% above the baseline at 5 units.
  • It multiplies a load factor, an operating factor, a conversion constant and a process multiplier into a single motor-sizing value. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Result: 5 units (headline result)
  • Base product: 5 value
  • Multiplier: 1 x
  • Factor A x B: 1,000 value

Run it with your numbers

  • Every input above is editable in the live Motor Sizing calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.