Tunnel Boring & Heavy Civil Equipment worked example

Weld Inspection Load with weld inspection station connected load of 30 kW: a worked example

What does the result look like when weld inspection station connected load reaches 30 kW? The full calculation is worked below with real intermediate numbers. Use it when weld inspection load in tunnel boring and heavy civil equipment is up for an upgrade and you want a defensible savings story.

The inputs for this scenario

  • Weld inspection station connected load: 30 kW (raised for this scenario; the documented default is 12)
  • Inspection station runtime: 8 hr (unchanged)
  • Blended electricity rate: 0.12 $ / kWh (unchanged)
  • Welds inspected during runtime: 1,000 units (unchanged)

Working through the calculation

  • Applying the documented formula (Total weld inspection load energy cost = weld inspection load connected load × weld inspection load runtime × blended electricity rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 240 kWh for weld inspection load energy used, the number this scenario is built around.
  • At this operating point the engine returns 28.8 $ for total weld inspection load energy cost.
  • At this operating point the engine returns 0.03 $ / piece for energy cost per kwh.
  • At this operating point the engine returns 3.6 $ / hr for hourly weld inspection load energy cost.

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 150% above the baseline at 240 kWh.
  • A figure at this level is achievable when weld inspection station connected load is genuinely sustained, not just peaked for a shift. 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: 240 kWh (headline result)
  • Total weld inspection load energy cost: 28.8 $
  • Energy cost per kWh: 0.03 $ / piece
  • Hourly weld inspection load energy cost: 3.6 $ / hr

Run it with your numbers

  • Every input above is editable in the live Weld Inspection Load calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.