Water, Wastewater & Pump Systems Manufacturing worked example

Skid Piping Labor at 7.2% fit-up, tack, and rework allowance: a worked example

Suppose fit-up, tack, and rework allowance falls to 7.2%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate skid piping labor for water, wastewater and pump systems manufacturing using production-ready inputs so teams can plan labor hours, schedule the work, or check whether the job fits the available shift time.

The inputs for this scenario

  • Skid pipe spools to fabricate and fit: 120 units (held at the documented default)
  • Spools fitted and welded per minute: 12 units / min (held at the documented default)
  • Fit-up, tack, and rework allowance: 7.2 % (the input this scenario stresses; the baseline uses 10)

Working through the calculation

  • The calculation starts from the formula this tool documents: Base skid piping labor time = skid piping labor workload รท skid piping labor completion rate.
  • Required skid piping labor time works out to 10.72 hr at these inputs, and this is the headline figure for the scenario.
  • Base skid piping labor time works out to 10 hr at these inputs.
  • Skid piping labor allowance applied works out to 7.2 % at these inputs.
  • Skid piping labor completion rate works out to 12 pieces / min at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where fit-up, tack, and rework allowance sits at 10% and the headline result is 11 hr, this scenario comes in 2.55% below the baseline at 10.72 hr.
  • It computes total piping labor hours from the spool count, the fit-and-weld completion rate, and a fit-up/rework allowance. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Required skid piping labor time: 10.72 hr (headline result)
  • Base skid piping labor time: 10 hr
  • Skid piping labor allowance applied: 7.2 %
  • Skid piping labor completion rate: 12 pieces / min

Run it with your numbers

  • To rerun this with your own numbers, open the live Skid Piping Labor calculator, set fit-up, tack, and rework allowance to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.