How do you calculate good test capacity?

Multiply units per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. Here 4 x 480 x 90 percent x 97 percent gives about 1,676 good units.

What is the difference between gross and good capacity?

Gross is the theoretical maximum, 1,920 units, before any losses. Good capacity, 1,676 here, is what actually passes after downtime and first-pass yield are applied.

How much capacity is lost to downtime?

With 90 percent uptime the cell loses 192 units to downtime in this example, the difference between the 1,920 gross and the uptime-adjusted figure.

How much capacity is lost to yield?

At 97 percent first-pass yield about 52 units fail on the first test, dropping output from the uptime-adjusted level to the 1,676 good units.

What is a good first-pass test yield for hydraulic assemblies?

Well-controlled hydraulic test cells run 95 percent or higher first-pass yield; the 97 percent default is realistic for a mature line testing for leaks, pressure and flow.

How do I increase good test capacity?

The two levers are uptime and yield. Cutting bench downtime recovers the 192-unit loss, while improving fit-up and seal quality upstream recovers the 52-unit yield loss.

Port, Crane & Terminal Equipment calculator

Hydraulic System Test Capacity Calculator

Hydraulic System Test Capacity projects how many crane and terminal hydraulic assemblies a test cell can validate as good over a run window, after downtime and first-pass yield losses. Test-cell supervisors and production planners use it to commit realistic throughput on hoist, luffing and steering hydraulic packs before they ship to crane assembly. Because a hydraulic test rig ties up a bench, an operator and instrumentation, knowing good output rather than gross output is what keeps assembly lines fed without over-promising. The downtime and yield loss breakdown shows exactly where capacity leaks so improvement effort lands where it pays.

What this calculator does

Estimate hydraulic system test capacity for port, crane and terminal equipment using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.
Use it when hydraulic system test capacity in port, crane and terminal equipment is being asked to take on more work and you need to know if there is room.
It multiplies units per cycle by available cycles for gross capacity, then multiplies by uptime and first-pass yield to give good tested output, with the losses broken out separately.

Formula used

Gross hydraulic system test capacity = hydraulic system test capacity output per cycle × available hydraulic system test capacity cycles
Good hydraulic system test capacity = gross capacity × expected hydraulic system test capacity uptime × expected hydraulic system test capacity first-pass yield

Inputs explained

Hydraulic assemblies tested per cycle:
Available test cycles in the window:
Expected test-cell uptime:
Expected first-pass test yield:

How to use the result

Use it when planning test-cell throughput, committing a delivery date for tested hydraulic assemblies, or sizing a second bench.
It applies uptime and yield as flat multipliers on the full window and ignores retest recovery, warm-up ramp, and cycle-time variation across assembly types, so a mixed test schedule will vary from the single-rate estimate.

Current U.S. benchmarks

U.S. housing starts run at 1,177k per year (Census, May 2026), down 8.7% from a year earlier, the demand driver for building products.
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 good test capacity? Multiply units per cycle by available cycles for gross capacity, then multiply by uptime and first-pass yield. Here 4 x 480 x 90 percent x 97 percent gives about 1,676 good units.
What is the difference between gross and good capacity? Gross is the theoretical maximum, 1,920 units, before any losses. Good capacity, 1,676 here, is what actually passes after downtime and first-pass yield are applied.
How much capacity is lost to downtime? With 90 percent uptime the cell loses 192 units to downtime in this example, the difference between the 1,920 gross and the uptime-adjusted figure.
How much capacity is lost to yield? At 97 percent first-pass yield about 52 units fail on the first test, dropping output from the uptime-adjusted level to the 1,676 good units.
What is a good first-pass test yield for hydraulic assemblies? Well-controlled hydraulic test cells run 95 percent or higher first-pass yield; the 97 percent default is realistic for a mature line testing for leaks, pressure and flow.

Last reviewed 2026-05-12.