Tank, Vessel & Pressure Equipment Fabrication worked example

Hydrotest Capacity at 65% test-bay uptime: a worked example in tank, vessel & pressure equipment fabrication

Here is what the math looks like when conditions slip. We hold every other input steady and drop test-bay uptime to 65%, then walk the calculation through step by step. Hydrotest Capacity estimates how many tanks or pressure vessels your hydrostatic test station can actually pass in a given period, after accounting for downtime and first-pass failures.

The inputs for this scenario

  • Vessels hydrotested per test cycle: 4 units / cycle (held at the documented default)
  • Available test cycles in the period: 480 cycles (held at the documented default)
  • Test-bay uptime: 65 % (the input this scenario stresses; the baseline uses 90)
  • First-pass hydrotest yield: 97 % (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Gross hydrotest capacity capacity = units per cycle × available cycles.
  • Good output capacity works out to 1,211 units at these inputs, and this is the headline figure for the scenario.
  • Gross capacity works out to 1,920 units at these inputs.
  • Uptime loss works out to 672 units at these inputs.
  • Yield loss works out to 37.44 units at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where test-bay uptime sits at 90% and the headline result is 1,676 units, this scenario comes in 27.78% below the baseline at 1,211 units.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to test-bay uptime, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes uniform vessel size and a fixed cycle; a run of large or multi-chamber vessels will consume more of each cycle than the average implies.

Results at a glance

  • Good output capacity: 1,211 units (headline result)
  • Gross capacity: 1,920 units
  • Uptime loss: 672 units
  • Yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Hydrotest Capacity calculator, set test-bay uptime to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.