Abrasive Blasting, Shot Peening & Surface Prep calculator

Surface Profile Risk Estimate Calculator

Surface profile is often checked after blasting with replica tape, depth micrometers, or comparators, but the risk starts with media size, hardness, pressure, angle, and dwell time. This calculator turns those controls into a practical risk score for jobs where anchor pattern matters to coating adhesion.

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
  • Returns a weighted profile risk score for deciding how much control and inspection the job needs.

Formula used

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

Inputs explained

  • Profile miss severity: Higher when coating spec, immersion service, or warranty exposure is severe.
  • Profile miss likelihood: Higher for worn media, low pressure, hard substrate, or uncertain prior coating.
  • Detection difficulty: Higher when readings are sparse or access makes profile checks difficult.

How to use the result

  • Use it before profile-critical coating work, specification changes, media changes, or blasting hard substrates.
  • It does not predict mils directly; always verify actual anchor profile with the method required by the coating specification.

Common questions

  • Does this output mils or microns? No. It is a risk score. Use replica tape, a depth micrometer, or the specified method to measure actual profile depth.
  • What raises likelihood? Low nozzle pressure, undersized media, excessive stand-off, worn media, or hard substrate can all raise the likelihood score.
  • How should inspectors use the score? A higher score supports more frequent readings, a hold point before coating, or a trial blast before production.
  • Can this replace a coating spec? No. It supports planning and risk review; the specification controls acceptance.

Last reviewed 2026-05-12.