Process Skids, Modular Equipment & Packaged Plants worked example

Instrument Loop Labor at 58% billable loop completion factor: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop billable loop completion factor to 58%, then walk the calculation through step by step. Instrument Loop Labor cost captures what it actually costs to loop-check the instrumentation on a process skid, blending per-loop technician labor with the fixed calibration and mobilization spend that hits every job.

The inputs for this scenario

  • Instrument loops checked out: 100 units (held at the documented default)
  • Labor cost per loop check: 45 $ / unit (held at the documented default)
  • Billable loop completion factor: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed calibration and mobilization cost: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Instrument Loop Labor cost = quantity × rate × capture factor + fixed cost.
  • Weighted cost works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Per piece value works out to 28.6 $ / piece at these inputs.
  • Captured value works out to 2,610 $ at these inputs.
  • Fixed adjustment works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where billable loop completion factor sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to billable loop completion factor, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. A single per-loop rate assumes loops are similar in complexity; a skid heavy in analytical or safety-instrumented loops will run well above a simple pressure-and-temperature average.

Results at a glance

  • Weighted cost: 2,860 $ (headline result)
  • Per piece value: 28.6 $ / piece
  • Captured value: 2,610 $
  • Fixed adjustment: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Instrument Loop Labor calculator, set billable loop completion factor to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.