Port, Crane & Terminal Equipment worked example

Lift Capacity Derating at 65% expected crane availability: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop expected crane availability to 65%, then walk the calculation through step by step. Estimate lift capacity derating for port, crane and terminal equipment using production-ready inputs so teams can confirm whether capacity can cover demand before committing the schedule.

The inputs for this scenario

  • Containers moved per crane cycle: 4 units / cycle (held at the documented default)
  • Available crane cycles in the period: 480 cycles (held at the documented default)
  • Expected crane availability: 65 % (the input this scenario stresses; the baseline uses 90)
  • Expected first-pass move success rate: 97 % (held at the documented default)

Working through the calculation

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

How this compares with the baseline

  • Against the tool's baseline example, where expected crane availability 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 expected crane availability, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It uses single average figures for availability and first-pass rate; it does not model hour-by-hour variation, operator fatigue late in a shift, or weather stoppages that cluster losses.

Results at a glance

  • Good lift capacity derating capacity: 1,211 units (headline result)
  • Gross lift capacity derating capacity: 1,920 units
  • Lift capacity derating downtime loss: 672 units
  • Lift capacity derating yield loss: 37.44 units

Run it with your numbers

  • To rerun this with your own numbers, open the live Lift Capacity Derating calculator, set expected crane availability to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.