A raw damage count ignores use. If damage and cycle scopes differ, the rate can mislead.

Numerator and denominator. Fix the period and plate group. Use recorded cycle entries for that group as denominator and damage events from the same scope as numerator.

Calculate the rate

Divide damage events by cycle entries and multiply by 100. This gives recorded events per 100 entries; it does not show cause or lifetime.

Separate damage types

  • Impact: an observed drop or collision.
  • Leakage: a recorded seepage finding.
  • Deformation: an observed change in shape.

Types may differ; review separate rates before combining them into one total.

Limits of comparison

Do not compare directly if group, definition or record coverage changed. A rising rate alone proves neither ageing nor a specific cause.

Record event date separately from discovery date. For example, do not assume damage found during washing happened then.

Next review. For groups with a rise, check cycle definitions, damage classes and missing records. Then follow the workplace maintenance process and exact model instructions for review.

Record fields

Keep plate or group ID, period, entry total, event type, known occurrence time and discovery date in the same report.