Why apply yield after uptime?

Downtime removes whole cycles, then yield removes failed pumps from the cycles that ran. Applying the losses in that order keeps the two loss rows separate and easy to trace.

How do I estimate first-pass yield?

Use the last month of test records: pumps that passed every acceptance check on the first run divided by pumps tested. Count retests as failures of the first pass.

What if the target exceeds good capacity?

The gap is the shortfall in good pumps. Add cycles, raise uptime or improve first-pass yield; the capacity gap row shows how far the stand falls short of the target.

Does every tested pump become good capacity?

No. Pump test stand capacity counts first-pass good pumps only. Pumps that fail a check and return later sit in the yield loss row until a retest passes.

Water, Wastewater & Pump Systems Manufacturing calculator

Pump Test Stand Capacity Calculator

Count the pumps a test stand can pass in a period once uptime and first-pass yield are applied, then compare that capacity with the target. Downtime and yield losses show where the capacity goes.

What this calculator does

Good pump capacity from stand cycles, uptime and first-pass yield, against the target the schedule needs.

Formula used

Gross test stand capacity = pumps tested per stand cycle × available test stand cycles
Good test stand capacity = gross capacity × uptime ÷ 100 × first-pass yield ÷ 100
Downtime loss = gross capacity − gross capacity × uptime ÷ 100
Yield loss = gross capacity × uptime ÷ 100 − good test stand capacity
Capacity gap = good test stand capacity − target good pumps

Inputs explained

Pumps Tested per Stand Cycle: Pumps loaded on the stand in one test cycle.
Available Test Stand Cycles: Test cycles the stand can run in the period.
Expected Test Stand Uptime: Share of scheduled cycles the stand is available.
Expected Test First-Pass Yield: Share of tested pumps that pass first time.
Target Good Pumps: Good pumps the period must deliver, from the schedule.

How to use the result

Best suited to sizing test stands for a build rate, checking capacity for a witness test campaign.
A capacity count is not a performance test; acceptance runs check head, flow, efficiency and net positive suction head. Changeover, setup and retest time sit inside uptime, not modeled separately.

Current U.S. benchmarks

The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

Why apply yield after uptime? Downtime removes whole cycles, then yield removes failed pumps from the cycles that ran. Applying the losses in that order keeps the two loss rows separate and easy to trace.
How do I estimate first-pass yield? Use the last month of test records: pumps that passed every acceptance check on the first run divided by pumps tested. Count retests as failures of the first pass.
What if the target exceeds good capacity? The gap is the shortfall in good pumps. Add cycles, raise uptime or improve first-pass yield; the capacity gap row shows how far the stand falls short of the target.
Does every tested pump become good capacity? No. Pump test stand capacity counts first-pass good pumps only. Pumps that fail a check and return later sit in the yield loss row until a retest passes.

Last reviewed 2026-10-01.