Tunnel Boring & Heavy Civil Equipment worked example

Steel Plate Yield at 99% target plate acceptance rate: a worked example in tunnel boring & heavy civil equipment

What does the result look like when target plate acceptance rate reaches 99%? The full calculation is worked below with real intermediate numbers. Use it when steel plate yield in tunnel boring and heavy civil equipment needs a clean rate and gap-to-target you can put on a tier board.

The inputs for this scenario

  • Steel plates rejected at inspection: 8 count (unchanged)
  • Total steel plates fabricated: 250 count (unchanged)
  • Target plate acceptance rate: 99 % (raised for this scenario; the documented default is 95)

Working through the calculation

  • Applying the documented formula (Steel plate yield rate = steel plate yield count ÷ total steel plate yield population × 100) to the inputs above produces each figure below.
  • At this operating point the engine returns 3.2 % for steel plate yield rate, the number this scenario is built around.
  • At this operating point the engine returns 95.8 points for steel plate yield gap to target.
  • At this operating point the engine returns 8 count for steel plate yield count.
  • At this operating point the engine returns 250 count for total steel plate yield population.

How this compares with the baseline

  • Against the tool's baseline example, where target plate acceptance rate sits at 95% and the headline result is 3.2 %, this scenario lands almost exactly on the baseline at 3.2 %.
  • A figure at this level is achievable when target plate acceptance rate is genuinely sustained, not just peaked for a shift. It is an aggregate reject ratio and does not separate defect types or distinguish scrap from reworkable plates, which have very different cost and schedule impacts.

Results at a glance

  • Steel plate yield rate: 3.2 % (headline result)
  • Steel plate yield gap to target: 95.8 points
  • Steel plate yield count: 8 count
  • Total steel plate yield population: 250 count

Run it with your numbers

  • Every input above is editable in the live Steel Plate Yield calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.