How do you calculate a surface profile risk score?

Multiply severity by 0.40, likelihood by 0.35, and detection difficulty by 0.25, then sum. With severity 8, likelihood 5, and detection 4, the score is 8(0.40) + 5(0.35) + 4(0.25) = 5.95.

What counts as a high profile risk score?

On a 1-10 scale, scores above roughly 6 warrant added inspection and process controls. The 5.95 in our example sits just under that line: severity is high, but moderate likelihood and detection keep it from being a top-priority item.

Why is severity weighted more than detection?

Because a coating failure from a missed anchor profile is expensive to remediate once in service, severity carries the largest weight at 40%. Detection is weighted lowest at 25%, reflecting that catching it matters but the consequence of a miss drives priority.

How is this different from a standard FMEA RPN?

A classic FMEA multiplies severity, occurrence, and detection for an RPN. This score instead weights and adds them, which avoids the multiplicative jumps that overstate risk and keeps results on the same 1-10 scale as the inputs.

How do I score detection difficulty for blast profile?

Rate how hard a profile miss is to catch before coating. Replica tape or a depth micrometer on every part scores low; relying on visual judgment or sampling one part per lot scores high because shallow or inconsistent profiles slip through.

What do I do with a high risk score?

Tighten the highest-weighted driver first. If severity is fixed by the spec, attack likelihood with abrasive and pressure control and attack detection with replica-tape testing, then re-score to confirm the action moved the number.

Abrasive Blasting, Shot Peening & Surface Prep calculator

Surface Profile Risk Estimate Calculator

Surface profile risk scoring weights how bad an out-of-spec blast profile would be, how likely it is to happen, and how hard it is to catch before coating, into a single prioritized number. Coatings inspectors, quality engineers, and blast supervisors use it as a focused, FMEA-style screen on the one defect that most often causes premature coating failure: a profile that is too shallow, too deep, or inconsistent for the specified anchor pattern. Because adhesion and coating life hinge on anchor profile, and a missed profile is invisible once paint goes on, this score steers inspection effort and process controls toward the jobs where a profile miss would be both consequential and easy to overlook.

What this calculator does

Score the risk that blast profile will miss the required anchor pattern using profile severity, occurrence, and detection ratings.
a coating inspector or blast lead wants a quick risk screen before releasing a profile-critical surface prep job
It blends profile miss severity, likelihood, and detection difficulty into a single weighted risk score using a 40/35/25 weighting.

Formula used

Profile risk score = severity × 0.40 + likelihood × 0.35 + detection difficulty × 0.25

Inputs explained

Profile miss severity:
Profile miss likelihood:
Detection difficulty:

How to use the result

Use it when triaging blast jobs for inspection intensity, building a coating QC plan, or prioritizing process fixes across multiple parts or contracts.
Scores are judgment-based on a relative scale, so they only compare meaningfully when the same rater uses consistent anchors across jobs.

Common questions

How do you calculate a surface profile risk score? Multiply severity by 0.40, likelihood by 0.35, and detection difficulty by 0.25, then sum. With severity 8, likelihood 5, and detection 4, the score is 8(0.40) + 5(0.35) + 4(0.25) = 5.95.
What counts as a high profile risk score? On a 1-10 scale, scores above roughly 6 warrant added inspection and process controls. The 5.95 in our example sits just under that line: severity is high, but moderate likelihood and detection keep it from being a top-priority item.
Why is severity weighted more than detection? Because a coating failure from a missed anchor profile is expensive to remediate once in service, severity carries the largest weight at 40%. Detection is weighted lowest at 25%, reflecting that catching it matters but the consequence of a miss drives priority.
How is this different from a standard FMEA RPN? A classic FMEA multiplies severity, occurrence, and detection for an RPN. This score instead weights and adds them, which avoids the multiplicative jumps that overstate risk and keeps results on the same 1-10 scale as the inputs.
How do I score detection difficulty for blast profile? Rate how hard a profile miss is to catch before coating. Replica tape or a depth micrometer on every part scores low; relying on visual judgment or sampling one part per lot scores high because shallow or inconsistent profiles slip through.

Last reviewed 2026-05-12.