How do you calculate leak test capacity?

Multiply units per cycle by available cycles to get gross capacity, then multiply by uptime and yield. With 4 units/cycle, 480 cycles, 90% uptime and 97% yield, gross is 1,920 and good output is about 1,676 units.

What is the difference between gross and good leak-test capacity?

Gross capacity (1,920 in the example) is the raw ceiling if nothing were lost. Good capacity (1,676) subtracts the 192 units lost to downtime and roughly 52 lost to rejects — it's what actually ships.

Should I improve uptime or yield first on a leak tester?

Chase the bigger loss. In the example uptime costs 192 units versus 52 for yield, so fixing downtime — fixture seals, cycle jams, staffing gaps — returns more than shaving the reject rate.

What is a good first-pass yield for leak testing?

For mature tube/pipe leak testing, first-pass yield above 96-98% is typical. Lower yields usually trace back to upstream weld or forming defects rather than the tester itself.

Does available cycles mean parts or machine cycles?

Machine cycles. Multiply by units per cycle to convert to parts, since a fixture may test several assemblies at once — 4 units across 480 cycles is 1,920 gross parts.

Why is my good output so much lower than gross capacity?

Because uptime and yield multiply. Even 90% uptime and 97% yield combine to about 87%, turning 1,920 gross into roughly 1,676 good — the compounding is why both factors matter.

Tube, Pipe & Profile Forming calculator

Leak Test Capacity Calculator

Leak test capacity tells you how many good, pressure-verified tube or pipe assemblies a leak-test station can deliver over a period once downtime and reject rates are accounted for. Quality and production engineers in tube and profile forming rely on it to confirm the leak booth won't become the bottleneck behind forming and welding. Because a leak tester is often a single serial station feeding shipment, its good-output capacity — not its gross cycle count — is what governs the line. This calculator separates gross capacity from the units lost to uptime and yield so you can target the bigger loss first.

What this calculator does

Leak test capacity tells you how many good, pressure-verified tube or pipe assemblies a leak-test station can deliver over a period once downtime and reject rates are accounted for.
Use it when leak test capacity in tube, pipe and profile forming is being asked to take on more work and you need to know if there is room.
It computes good output capacity as units per cycle times available cycles times uptime times yield, and breaks out the units lost to uptime and to yield separately.

Formula used

Gross leak test capacity capacity = units per cycle × available cycles
Good capacity = gross capacity × uptime × yield

Inputs explained

Tubes leak-tested per cycle:
Available leak-test cycles:
Leak-test station uptime:
First-pass leak-test yield:

How to use the result

Use it when planning leak-test staffing and shifts, checking if the test station can keep pace with upstream forming, or justifying a second fixture or booth.
It assumes uptime and yield are independent, stable percentages; a station with correlated failures (a bad batch that both jams and rejects) will behave worse than the model predicts.

Current U.S. benchmarks

The producer price index for steel mill products stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. Quotes priced off last quarter's material cost miss this move.

Common questions

How do you calculate leak test capacity? Multiply units per cycle by available cycles to get gross capacity, then multiply by uptime and yield. With 4 units/cycle, 480 cycles, 90% uptime and 97% yield, gross is 1,920 and good output is about 1,676 units.
What is the difference between gross and good leak-test capacity? Gross capacity (1,920 in the example) is the raw ceiling if nothing were lost. Good capacity (1,676) subtracts the 192 units lost to downtime and roughly 52 lost to rejects — it's what actually ships.
Should I improve uptime or yield first on a leak tester? Chase the bigger loss. In the example uptime costs 192 units versus 52 for yield, so fixing downtime — fixture seals, cycle jams, staffing gaps — returns more than shaving the reject rate.
What is a good first-pass yield for leak testing? For mature tube/pipe leak testing, first-pass yield above 96-98% is typical. Lower yields usually trace back to upstream weld or forming defects rather than the tester itself.
Does available cycles mean parts or machine cycles? Machine cycles. Multiply by units per cycle to convert to parts, since a fixture may test several assemblies at once — 4 units across 480 cycles is 1,920 gross parts.

Last reviewed 2026-05-12.