How is the warranty exposure score calculated?

It is severity x 0.40 + occurrence x 0.35 + detection x 0.25. With severity 7, occurrence 3, and detection 4 the score is 2.8 + 1.05 + 1.0 = 4.85.

What is a high warranty exposure score?

On a 1-10 scale, scores above roughly 6 flag failure modes that warrant action now. The example's 4.85 is moderate — worth monitoring but not the top priority unless its severity (7) makes a field burst unacceptable.

Why is severity weighted more than detection?

In fluid conveyance a single high-severity failure — a hydraulic hose burst or a coolant-line leak — can dwarf the cost of many minor escapes, so the model gives severity the largest 40% weight.

How does this differ from an RPN in FMEA?

A traditional RPN multiplies the three numbers, which over-weights extremes and is hard to compare. This weighted-sum keeps the score on the same 1-10 scale and makes the severity emphasis explicit.

What should I do about a high-severity, low-occurrence item?

That is exactly what this score catches. Even with occurrence 3, a severity-7 burst risk keeps exposure at 4.85 — add a 100% proof-pressure test or tighter crimp traceability rather than relying on it being rare.

How do I keep the scores consistent across engineers?

Write anchored definitions for each 1-10 level — e.g. severity 7 = customer machine downtime, 9 = safety event — and tie occurrence to your actual ppm and return rates.

Hose, Tubing & Fluid Conveyance Products calculator

Warranty Exposure Calculator

Warranty exposure is a weighted risk score that tells a fluid-conveyance manufacturer which hose or tubing failure modes are most likely to cost them in the field. It blends how bad a failure is (a burst on a hydraulic line versus a cosmetic mark), how often it happens, and how hard it is to catch before the assembly ships. Quality engineers and warranty managers use it to rank failure modes from an FMEA so limited inspection and design dollars go where they prevent the most returns. Unlike a raw defect count, it surfaces the low-frequency-but-catastrophic risks that quietly drain a warranty budget.

What this calculator does

Score warranty exposure risk for a hose or tubing assembly product from failure severity, occurrence likelihood, and detection difficulty.
Use it when reviewing warranty risk for a hose assembly product, ranking claims by risk priority, or deciding whether a design or process change is justified.
It combines a severity, occurrence, and detection score into one weighted exposure number, with severity weighted most heavily (40%) and detection least (25%).

Formula used

Warranty exposure score = severity x 0.40 + occurrence x 0.35 + detection x 0.25

Inputs explained

Field-failure severity (impact if it fails):
Failure occurrence likelihood:
Detection difficulty before shipment:

How to use the result

Use it when prioritizing failure modes from a hose/tubing FMEA, or when deciding where to add proof testing, traceability, or design margin.
The 1-10 inputs are judgment-based, so the score is only as good as your scoring discipline — calibrate the scales against real field-return data, not gut feel.

Current U.S. benchmarks

The U.S. has 11,391 plastics and rubber products establishments employing about 815,988 workers (Census County Business Patterns, 2023).

Common questions

How is the warranty exposure score calculated? It is severity x 0.40 + occurrence x 0.35 + detection x 0.25. With severity 7, occurrence 3, and detection 4 the score is 2.8 + 1.05 + 1.0 = 4.85.
What is a high warranty exposure score? On a 1-10 scale, scores above roughly 6 flag failure modes that warrant action now. The example's 4.85 is moderate — worth monitoring but not the top priority unless its severity (7) makes a field burst unacceptable.
Why is severity weighted more than detection? In fluid conveyance a single high-severity failure — a hydraulic hose burst or a coolant-line leak — can dwarf the cost of many minor escapes, so the model gives severity the largest 40% weight.
How does this differ from an RPN in FMEA? A traditional RPN multiplies the three numbers, which over-weights extremes and is hard to compare. This weighted-sum keeps the score on the same 1-10 scale and makes the severity emphasis explicit.
What should I do about a high-severity, low-occurrence item? That is exactly what this score catches. Even with occurrence 3, a severity-7 burst risk keeps exposure at 4.85 — add a 100% proof-pressure test or tighter crimp traceability rather than relying on it being rare.

Last reviewed 2026-05-12.