Glossary

80/20 Rule: A "rule" attributed to the Italian statistician Pareto based upon his study of 18th century economic wealth distribution in Italy. For our purposes, it attributes 80% of the problems to 20% of the equipment. Generally the Pareto rule can be found in many skewed distributions.

Abandoned-in-place: Equipment removed from service and left in its location in a plant because the cost of removal exceeds the scrap value. Equipment that adds marginal value to a process compared to cost, may be left "un-maintained" in place with no cost or production impact.
Acceptance criteria: Specific limits for acceptance. A term with general meaning, but nuclear origin. Also used for operationalized failure criteria, generally describing a test. Time-based PM will sometimes have acceptance criteria. Large turbine bearings will be reused as is, i.e., unless wear exceeds so many thousandths.
Actuarial: Mathematical statistical failure analysis using practices accepted by the insurance industry and Society of Actuaries (SOA) or other professional groups (as appropriate) to measure aging, risk, and mortality (based on study for human populations).
A-E: Architect-engineer. The facility designer usually hired as a contractor to provide a facility design. Occasionally also the constructor ("design-construct")
After-market: The parts and services supply market for equipment other than through the OEM. After-market parts can be superior to OEM parts, but there's much greater risk in the after market for parts reliability and quality. This risk is generally borne by the buyer.
Age: Time correlation factor. The accumulated time since the...

< Previous Excerpt Next Excerpt >

Applied Reliability-Centered Maintenance