Water, Wastewater & Pump Systems Manufacturing worked example

Skid Piping Labor at 12% fit-up, tack, and rework allowance: a worked example

Push fit-up, tack, and rework allowance up to 12% and the picture changes. This example computes every intermediate figure at that operating point. Use it when skid piping labor in water, wastewater and pump systems manufacturing is being added to next week's schedule and you need an honest hours estimate.

The inputs for this scenario

  • Skid pipe spools to fabricate and fit: 120 units (unchanged)
  • Spools fitted and welded per minute: 12 units / min (unchanged)
  • Fit-up, tack, and rework allowance: 12 % (raised for this scenario; the documented default is 10)

Working through the calculation

  • Applying the documented formula (Base skid piping labor time = skid piping labor workload รท skid piping labor completion rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.2 hr for required skid piping labor time, the number this scenario is built around.
  • At this operating point the engine returns 10 hr for base skid piping labor time.
  • At this operating point the engine returns 12 % for skid piping labor allowance applied.
  • At this operating point the engine returns 12 pieces / min for skid piping labor completion rate.

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 1.82% above the baseline at 11.2 hr.
  • It computes total piping labor hours from the spool count, the fit-and-weld completion rate, and a fit-up/rework allowance. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Required skid piping labor time: 11.2 hr (headline result)
  • Base skid piping labor time: 10 hr
  • Skid piping labor allowance applied: 12 %
  • Skid piping labor completion rate: 12 pieces / min

Run it with your numbers

  • Every input above is editable in the live Skid Piping Labor calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.