How do you calculate leak test capacity?

Multiply assemblies per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 per cycle, 480 cycles, 90% uptime and 97% yield: 4×480 = 1,920 gross, ×0.90×0.97 = about 1,676 passed assemblies.

What's the difference between gross and passed leak-test capacity?

Gross capacity (1,920 here) is the theoretical maximum if the stand never stopped and nothing failed. Passed capacity (about 1,676) subtracts the 192 units lost to downtime and the roughly 52 lost to first-pass rejects — it's the number you can actually ship.

What is a good first-pass leak-test yield?

For mature membrane-housing assembly, first-pass yields above 95% are typical and 97-99% is strong. The 97% default loses only about 52 units of the post-uptime capacity; a drop to 90% would cost far more and signals a sealing or assembly problem.

How much does test-stand uptime cost me?

At 90% uptime on 1,920 gross capacity, you lose 192 assemblies of throughput to downtime alone — more than the rework loss. Improving stand availability is often the biggest lever for capacity on a leak-test bottleneck.

Should I count reworked assemblies in this capacity?

This calculator treats first-pass rejects as lost, so it's conservative. If you successfully re-test and pass most rejects, your true qualified output sits between the passed figure (1,676) and gross (1,920); model rework separately to capture it.

How do I increase forecast passed capacity?

You have four levers: fixture more assemblies per cycle, run more cycles, raise stand uptime, or raise first-pass yield. Because they multiply, the biggest gain comes from fixing whichever input is currently lowest — here uptime at 90% is the weak point.

Desalination & Membrane Water Treatment Equipment calculator

Leak Test Capacity Calculator

Leak Test Capacity forecasts how many membrane housings, pressure-vessel assemblies, or manifold modules a leak-test stand can actually qualify in a period, after stand downtime and first-pass rejects are subtracted from the gross theoretical count. Production planners and quality engineers building membrane and desalination equipment use it to size the test bottleneck, plan staffing, and commit to delivery dates. The headline figure is passed capacity, not gross capacity, because an assembly that fails the leak test consumes a slot but yields no shippable unit. Knowing the realistic passed number keeps the test stand from quietly becoming the line's constraint.

What this calculator does

Forecast how many membrane skids, pressure vessels, piping modules, or valve assemblies can complete leak testing in the available test window.
Use it when leak test capacity in desalination and membrane water treatment equipment is being asked to take on more work and you need to know if there is room.
It computes forecast passed leak-test capacity by multiplying assemblies-per-cycle and available cycles into gross capacity, then derating for test-stand uptime and first-pass yield.

Formula used

Gross leak-test capacity = assemblies tested per cycle × available leak-test cycles
Forecast passed leak-test capacity = gross capacity × expected test stand uptime × first-pass leak-test yield

Inputs explained

Assemblies tested per leak-test cycle:
Leak-test cycles available in the period:
Expected test-stand uptime:
First-pass leak-test yield:

How to use the result

Use it when planning leak-test throughput, sizing a test stand against demand, or committing to a build schedule for membrane assemblies.
It assumes failed assemblies are scrapped from the count, not reworked back through the stand — if you re-test rejects, true qualified output is higher than the first-pass figure shows.

Current U.S. benchmarks

Global copper trades at $13,484 per tonne (IMF via FRED, May 2026), up 41.5% in a year, and U.S. industrial electricity averages 8.66 cents per kWh. Both feed electrified-hardware unit economics.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate leak test capacity? Multiply assemblies per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. With 4 per cycle, 480 cycles, 90% uptime and 97% yield: 4×480 = 1,920 gross, ×0.90×0.97 = about 1,676 passed assemblies.
What's the difference between gross and passed leak-test capacity? Gross capacity (1,920 here) is the theoretical maximum if the stand never stopped and nothing failed. Passed capacity (about 1,676) subtracts the 192 units lost to downtime and the roughly 52 lost to first-pass rejects — it's the number you can actually ship.
What is a good first-pass leak-test yield? For mature membrane-housing assembly, first-pass yields above 95% are typical and 97-99% is strong. The 97% default loses only about 52 units of the post-uptime capacity; a drop to 90% would cost far more and signals a sealing or assembly problem.
How much does test-stand uptime cost me? At 90% uptime on 1,920 gross capacity, you lose 192 assemblies of throughput to downtime alone — more than the rework loss. Improving stand availability is often the biggest lever for capacity on a leak-test bottleneck.
Should I count reworked assemblies in this capacity? This calculator treats first-pass rejects as lost, so it's conservative. If you successfully re-test and pass most rejects, your true qualified output sits between the passed figure (1,676) and gross (1,920); model rework separately to capture it.

Last reviewed 2026-05-12.