Is the failure rate really limited to 100%?

Yes. The rate is a share of one fleet over the warranty term, so it cannot exceed every pump failing. A value above 100 means the claim count exceeds the population, which is impossible.

What belongs in the replacement cost?

Parts, labor and any crane or rigging time for one seal replacement at the current rate. Use a blended cost if the fleet mixes seal sizes, and revisit it when parts prices move.

Why is claim administration fixed?

It covers claim handling, freight and paperwork that arrive whatever the claim count. If your handler bills per claim, move that part into the replacement cost instead and keep only the true fixed cost here.

How do I read reserve per pump?

It is the total reserve divided by the pumps under warranty. Compare it with your target reserve per pump; when it runs above target, the claim rate or replacement cost is high for the fleet.

Water, Wastewater & Pump Systems Manufacturing calculator

Seal Failure Warranty Reserve Calculator

Size a warranty reserve from the pumps under seal warranty, the replacement cost and the expected failure rate, then read the reserve per pump against your target. The rate stays a share of the same fleet.

What this calculator does

Warranty reserve for expected mechanical seal failures across a pump fleet, plus the per-pump reserve against your target.

Formula used

Expected claims cost = pumps under warranty × seal replacement cost × failure rate ÷ 100
Total reserve = expected claims cost + fixed claim administration
Reserve per pump = total reserve ÷ pumps under warranty
Reserve over target = reserve per pump − target reserve per pump

Inputs explained

Pumps Under Seal Warranty: Pumps still inside the seal warranty term on the fleet list.
Mechanical Seal Replacement Cost per Pump: Parts and labor for one seal replacement at today's rate.
Expected Seal Failure Rate Over Warranty Term: Expected share of the fleet needing a seal claim over the term.
Fixed Claim Administration Cost: Claim handling, freight and paperwork not tied to claim count.
Target Reserve per Pump: Reserve per pump your warranty plan wants to hold.

How to use the result

Best suited to setting a warranty reserve for a fleet, reviewing seal claim exposure.
A single average failure rate cannot show infant seal failures or a bad batch of seals. Claims arrive unevenly over the term, so the reserve is a planning figure, not a cash schedule.

Current U.S. benchmarks

The U.S. has 21,668 machinery manufacturing establishments employing about 1,086,146 workers (Census County Business Patterns, 2023).

Common questions

Is the failure rate really limited to 100%? Yes. The rate is a share of one fleet over the warranty term, so it cannot exceed every pump failing. A value above 100 means the claim count exceeds the population, which is impossible.
What belongs in the replacement cost? Parts, labor and any crane or rigging time for one seal replacement at the current rate. Use a blended cost if the fleet mixes seal sizes, and revisit it when parts prices move.
Why is claim administration fixed? It covers claim handling, freight and paperwork that arrive whatever the claim count. If your handler bills per claim, move that part into the replacement cost instead and keep only the true fixed cost here.
How do I read reserve per pump? It is the total reserve divided by the pumps under warranty. Compare it with your target reserve per pump; when it runs above target, the claim rate or replacement cost is high for the fleet.

Last reviewed 2026-10-01.