Process Manufacturing worked example

Pump Runtime at 7.2% priming, valve, and line-clear allowance: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop priming, valve, and line-clear allowance to 7.2%, then walk the calculation through step by step. Estimate pump runtime from transfer volume, measured pump rate, and operating allowance.

The inputs for this scenario

  • Required transfer volume: 5,000 gal (held at the documented default)
  • Measured pump rate: 110 gal / min (held at the documented default)
  • Priming, valve, and line-clear allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base pump runtime = required transfer volume รท measured pump rate.
  • required pump runtime works out to 48.73 min at these inputs, and this is the headline figure for the scenario.
  • base pump runtime works out to 45.45 min at these inputs.
  • pump allowance applied works out to 7.2 % at these inputs.
  • measured pump rate works out to 110 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where priming, valve, and line-clear allowance sits at 10% and the headline result is 50 min, this scenario comes in 2.55% below the baseline at 48.73 min.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to priming, valve, and line-clear allowance, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. The allowance is a flat percentage; it won't capture a pump that loses rate as head rises or as a tank draws down toward the suction.

Results at a glance

  • required pump runtime: 48.73 min (headline result)
  • base pump runtime: 45.45 min
  • pump allowance applied: 7.2 %
  • measured pump rate: 110 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Pump Runtime calculator, set priming, valve, and line-clear allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.