Desalination & Membrane Water Treatment Equipment worked example

Field Service Reserve at 58% service reserve probability included: a worked example in desalination & membrane water treatment equipment

Suppose service reserve probability included falls to 58%. This page works the full calculation at that level so you can see exactly which result moves and by how much. Estimate reserve dollars for startup support, warranty visits, membrane troubleshooting, pump service, controls support, or operator training on delivered water treatment systems.

The inputs for this scenario

  • Systems or service events covered: 100 events (held at the documented default)
  • Expected service cost per event: 45 $ / event (held at the documented default)
  • Service reserve probability included: 58 % (the input this scenario stresses; the baseline uses 80)
  • Fixed travel or mobilization reserve: 250 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Expected variable field service reserve = systems or service events covered × expected service cost per event × service reserve probability included.
  • Total field service reserve works out to 2,860 $ at these inputs, and this is the headline figure for the scenario.
  • Field service reserve per covered event works out to 28.6 $ / piece at these inputs.
  • Expected variable field service reserve works out to 2,610 $ at these inputs.
  • Fixed travel or mobilization reserve works out to 250 $ at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where service reserve probability included sits at 80% and the headline result is 3,850 $, this scenario comes in 25.71% below the baseline at 2,860 $.
  • It multiplies covered service events by the expected per-event cost and a claim probability to get the variable reserve, then adds a fixed travel or mobilization reserve for the total. When the numbers land here, the stressed input is the lever to work; the walkthrough above shows exactly how much each output recovers as it climbs back toward the baseline.

Results at a glance

  • Total field service reserve: 2,860 $ (headline result)
  • Field service reserve per covered event: 28.6 $ / piece
  • Expected variable field service reserve: 2,610 $
  • Fixed travel or mobilization reserve: 250 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Field Service Reserve calculator, set service reserve probability included to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.