How do you calculate water leak test capacity?

Multiply vehicles per cycle by planned cycles for gross capacity, then multiply by booth availability and first-pass yield. Here 1 x 30 = 30 gross, x 90% x 88% = 23.76 usable vehicles.

Why is usable capacity lower than gross?

Gross assumes the booth never stops and every vehicle passes. The example loses 3 vehicles to downtime and 3.24 to retest or rework, dropping 30 gross to 23.76 usable.

What booth availability should I plan for?

A well-maintained water booth runs 88 to 92% available once you subtract spray-system maintenance and changeovers; the default 90% is a sound planning figure.

How does first-pass yield affect capacity?

Every leaker that comes back for a retest consumes a booth slot a passing vehicle would have used. At 88% first-pass, 12% of throughput is effectively spent on retests.

How do I increase water leak test capacity?

Lift availability with preventive spray-nozzle maintenance, raise first-pass yield by fixing upstream sealing and glazing, or add cycles by extending the test window.

Capacity vs throughput — what is the difference here?

Capacity is the usable ceiling the booth can clear; throughput is what it actually clears on a given day, which is capacity minus unplanned stops and queue starvation.

Commercial Vehicle, Bus & Coach Manufacturing calculator

Water Leak Test Capacity Calculator

Water leak test capacity is how many buses or coaches a water-spray booth can actually clear in a planning period once you account for booth uptime and first-pass yield. Plant schedulers and quality managers use it because the water booth is a single-vehicle gate near end of line — every coach must pass a spray test before handover, so the booth's real throughput caps the whole plant. It matters because gross cycle counts overstate capacity: downtime steals slots and leakers come back for a retest that eats another cycle. The calculator separates gross from usable capacity and shows exactly how many vehicles are lost to downtime versus rework.

What this calculator does

Estimate water leak test capacity for buses, coaches, vans, shuttles, or specialty vehicle bodies.
planning vehicle water leak test throughput
It multiplies vehicles per booth cycle by planned cycles for gross capacity, then derates by booth availability and first-pass yield to give the usable vehicles cleared.

Formula used

Gross water leak test capacity = vehicles tested per water booth cycle × planned water leak test cycles
Usable water leak test capacity = gross output × water test booth availability × first-pass water leak test yield

Inputs explained

Vehicles tested per water booth cycle:
Planned water leak test cycles:
Water test booth availability:
First-pass water leak test yield:

How to use the result

Use it when planning a shift or week at the water-test gate, or checking whether the booth can keep pace with line output.
It treats yield loss as fully lost capacity, but a leaker that only needs a quick reseal may re-enter faster than a full cycle, so usable capacity can be slightly conservative.

Current U.S. benchmarks

U.S. light vehicles sell at a 16.9 million annual rate (BEA, Jun 2026), up 4.1% from a year earlier, the volume signal for automotive supply chains.
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).
The U.S. has 11,691 transportation equipment establishments employing about 1,682,910 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate water leak test capacity? Multiply vehicles per cycle by planned cycles for gross capacity, then multiply by booth availability and first-pass yield. Here 1 x 30 = 30 gross, x 90% x 88% = 23.76 usable vehicles.
Why is usable capacity lower than gross? Gross assumes the booth never stops and every vehicle passes. The example loses 3 vehicles to downtime and 3.24 to retest or rework, dropping 30 gross to 23.76 usable.
What booth availability should I plan for? A well-maintained water booth runs 88 to 92% available once you subtract spray-system maintenance and changeovers; the default 90% is a sound planning figure.
How does first-pass yield affect capacity? Every leaker that comes back for a retest consumes a booth slot a passing vehicle would have used. At 88% first-pass, 12% of throughput is effectively spent on retests.
How do I increase water leak test capacity? Lift availability with preventive spray-nozzle maintenance, raise first-pass yield by fixing upstream sealing and glazing, or add cycles by extending the test window.

Last reviewed 2026-05-12.