Pump, Compressor & Rotating Equipment Assembly worked example

Test Stand Capacity at 65% test-stand uptime: a worked example in pump, compressor & rotating equipment assembly

This worked example runs the test stand capacity numbers for a tougher week than the baseline: 65% test-stand uptime instead of the typical 90%. Test stand capacity is the real number of pumps or compressors your certification bay can pressure-test, spin-test, and pass in a period — after uptime and first-pass yield eat into the theoretical maximum.

The inputs for this scenario

  • Units tested per test-stand cycle: 4 units / cycle (held at the documented default)
  • Available test-stand cycles: 480 cycles (held at the documented default)
  • Test-stand uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • First-pass test yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross test stand capacity capacity = units per cycle × available cycles.
  • Good output capacity works out to 1,211 units at these inputs, and this is the headline figure for the scenario.
  • Gross capacity works out to 1,920 units at these inputs.
  • Uptime loss works out to 672 units at these inputs.
  • Yield loss works out to 37.44 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where test-stand uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • Use it when the test bay is the suspected constraint, when quoting lead times, or when justifying a second stand or a yield-improvement project. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Good output capacity: 1,211 units (headline result)
  • Gross capacity: 1,920 units
  • Uptime loss: 672 units
  • Yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Test Stand Capacity calculator, set test-stand uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.