Municipal Waste Sorting Equipment worked example

Warranty and Field Failure Reserve at 69% share of install base under warranty: a worked example

This scenario runs the warranty and field failure reserve calculation on the strong side: 69% share of install base under warranty, with every other input held at its documented default. Use it when an equipment supplier prices the warranty reserve into a quote, or an operator sets aside contingency for early-life field issues on a new line.

The inputs for this scenario

  • Expected field failures in period: 12 events (unchanged)
  • Average cost per field failure event: 2,500 $ / event (unchanged)
  • Share of install base under warranty: 69 % (raised for this scenario; the documented default is 60)
  • Fixed program contingency: 5,000 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Variable field failure cost = expected field failures x cost per field failure event x share of install base in scope) to the inputs above produces each figure below.
  • At this operating point the engine returns 25,700 $ for total warranty and field failure reserve, the number this scenario is built around.
  • At this operating point the engine returns 2,142 $ / piece for reserve cost per failure event.
  • At this operating point the engine returns 20,700 $ for variable field failure cost.
  • At this operating point the engine returns 5,000 $ for fixed program contingency.

How this compares with the baseline

  • Against the tool's baseline example, where share of install base under warranty sits at 60% and the headline result is 23,000 $, this scenario comes in 11.74% above the baseline at 25,700 $.
  • Use it at quoting time to price warranty, and quarterly to true up the reserve against actual field experience. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Total warranty and field failure reserve: 25,700 $ (headline result)
  • Reserve cost per failure event: 2,142 $ / piece
  • Variable field failure cost: 20,700 $
  • Fixed program contingency: 5,000 $

Run it with your numbers

  • Every input above is editable in the live Warranty and Field Failure Reserve calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.