Refractories, Furnace Linings & Foundry Consumables worked example

Crew Utilization at 68% target crew utilization: a worked example

This worked example runs the crew utilization numbers for a tougher week than the baseline: 68% target crew utilization instead of the typical 95%. Crew Utilization measures how much of a refractory relining crew's available time is actually charged to productive lining work versus idle standby, waiting on furnace cooldown, or material delays.

The inputs for this scenario

  • Relining crew hours actually charged: 8 units (held at the documented default)
  • Total crew hours available in window: 250 units (held at the documented default)
  • Target crew utilization: 68 % (the input this scenario stresses; the baseline uses 95)

Working through the calculation

  • The calculation starts from the formula this tool documents: Crew Utilization rate = affected amount รท total amount.
  • Rate works out to 3.2 % at these inputs, and this is the headline figure for the scenario.
  • Gap to target works out to 64.8 points at these inputs.
  • Affected count works out to 8 count at these inputs.
  • Total count works out to 250 count at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where target crew utilization sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • Use it during and after a furnace relining outage to judge how effectively crew time was used, or to track a contractor's productivity week over week. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Rate: 3.2 % (headline result)
  • Gap to target: 64.8 points
  • Affected count: 8 count
  • Total count: 250 count

Run it with your numbers

  • To rerun this with your own numbers, open the live Crew Utilization calculator, set target crew utilization to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.