Water, Wastewater & Pump Systems Manufacturing worked example

Corrosion Allowance Cost at 110% share of parts requiring corrosion allowance: a worked example

What does the result look like when share of parts requiring corrosion allowance reaches 110%? The full calculation is worked below with real intermediate numbers. a pump engineering team needs to price the extra wall thickness specified as corrosion allowance for aggressive-service casings

The inputs for this scenario

  • Pressure-containing parts requiring review: 80 parts (unchanged)
  • Added material cost per part for allowance: 45 $ / part (unchanged)
  • Share of parts requiring corrosion allowance: 110 % (raised for this scenario; the documented default is 100)
  • Fixed upgrade engineering cost: 900 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Total corrosion allowance cost = pressure-containing parts x added material cost per part x share requiring allowance + fixed upgrade engineering cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 4,860 $ for total corrosion allowance cost, the number this scenario is built around.
  • At this operating point the engine returns 60.75 $ / piece for corrosion allowance cost per unit.
  • At this operating point the engine returns 3,960 $ for variable corrosion allowance cost.
  • At this operating point the engine returns 900 $ for fixed corrosion allowance cost adder.

How this compares with the baseline

  • Against the tool's baseline example, where share of parts requiring corrosion allowance sits at 100% and the headline result is 4,500 $, this scenario comes in 8% above the baseline at 4,860 $.
  • A figure at this level is achievable when share of parts requiring corrosion allowance is genuinely sustained, not just peaked for a shift. It uses a single added-cost figure per part, so it won't capture part-to-part variation in size, alloy, or machining difficulty.

Results at a glance

  • Total corrosion allowance cost: 4,860 $ (headline result)
  • Corrosion allowance cost per unit: 60.75 $ / piece
  • Variable corrosion allowance cost: 3,960 $
  • Fixed corrosion allowance cost adder: 900 $

Run it with your numbers

  • Every input above is editable in the live Corrosion Allowance Cost calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.