How should a plant rank bad actor equipment for a defect elimination program?
A bad actor list should identify recurring losses worth investigating, not merely the assets with the most work orders. Build a repeatable ranking from validated events, production consequences and evidence quality.
Define the unit of analysis
Use a consistent asset hierarchy and failure event definition. One equipment trip may generate several work orders, alarm entries and shift notes. Consolidate these into one event before ranking. Separate true failures from inspections, scheduled overhauls and duplicate notifications. Record the time window and exclude assets not operating during the comparison period.
Rank consequence and recurrence together
For each asset, count verified functional failures, unplanned downtime, lost production, maintenance labor, material costs and safety or environmental exposure. Keep consequence categories visible rather than hiding them in a single weighted score. Use production exposure or operating hours when comparing equipment with very different duty cycles. Treat estimated costs as estimates, not measured losses.
Validate with the people who operated and repaired the equipment
Review the preliminary ranking with operations, maintenance, engineering and planning. Confirm whether the asset tag represents one machine or an entire package. Examine failure narratives and whether a recent modification changed the pattern. A high work order count can reflect diligent inspections rather than poor reliability.
Example: recurring cooling water pump trips
A pump has eight CMMS notifications but only three independent trip events. Two notifications document follow-up inspections and three refer to the same trip. The team ranks three events, checks actual downtime and production effects, then examines suction conditions, motor protection records and operating configuration before selecting an RCA.
Turn the list into a controlled improvement backlog
Assign an owner, problem statement, evidence gaps, action due dates and a measure of effectiveness. Review top bad actors monthly and close items only after observing performance under comparable operating conditions. If a proposed change alters safeguards or operating limits, route it through the plant's change process.
Implementation checklist
- Agree on failure event definitions and review period
- Deduplicate notifications and validate equipment tags
- Separate recurrence, severity and data confidence
- Assign an investigation owner and measurable outcome
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Technical references
ISO 14224 asset and failure data standard · OSHA process safety management requirements