Tunnel Boring & Heavy Civil Equipment worked example

Weld Inspection Load with weld inspection station connected load of 6 kW: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop weld inspection station connected load to 6 kW, then walk the calculation through step by step. Estimate weld inspection load for tunnel boring and heavy civil equipment using production-ready inputs so teams can budget energy cost, compare equipment settings, or include electricity in the quote.

The inputs for this scenario

  • Weld inspection station connected load: 6 kW (the input this scenario stresses; the baseline uses 12)
  • Inspection station runtime: 8 hr (held at the documented default)
  • Blended electricity rate: 0.12 $ / kWh (held at the documented default)
  • Welds inspected during runtime: 1,000 units (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Total weld inspection load energy cost = weld inspection load connected load × weld inspection load runtime × blended electricity rate.
  • Weld inspection load energy used works out to 48 kWh at these inputs, and this is the headline figure for the scenario.
  • Total weld inspection load energy cost works out to 5.76 $ at these inputs.
  • Energy cost per kWh works out to 0.01 $ / piece at these inputs.
  • Hourly weld inspection load energy cost works out to 0.72 $ / hr at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where weld inspection station connected load sits at 12 kW and the headline result is 96 kWh, this scenario comes in 50% below the baseline at 48 kWh.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to weld inspection station connected load, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It uses connected load, so it overstates consumption if the station idles or cycles; apply a duty factor to the kW input for a truer average.

Results at a glance

  • Weld inspection load energy used: 48 kWh (headline result)
  • Total weld inspection load energy cost: 5.76 $
  • Energy cost per kWh: 0.01 $ / piece
  • Hourly weld inspection load energy cost: 0.72 $ / hr

Run it with your numbers

  • To rerun this with your own numbers, open the live Weld Inspection Load calculator, set weld inspection station connected load to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.