Maintenance Types and Definitions Flashcards

A set of vocabulary flashcards covering the definitions, strategies, and intervals associated with various maintenance types as presented in the lecture notes.

Preventive Maintenance

A maintenance strategy based on replacing or restoring an asset at fixed intervals regardless of its condition, performed while the equipment is still functioning to prevent or limit failure.

Corrective Maintenance (CM)

Maintenance performed after a failure has occurred to restore the function of an item; it can be the result of a deliberate run-to-failure strategy or unplanned failures.

Time Based Maintenance (TBM)

Also known as Scheduled Restoration, this refers to replacing or renewing an item at a fixed time, interval, or usage (e.g., every $10,000\,km$) regardless of its condition.

Mean Time Between Failure (MTBF)

A predictable interval used in Time Based Maintenance, assuming that failure is age-related and a clear service life can be assigned to wearing parts.

Failure Finding Maintenance (FFM)

Tasks aimed at detecting hidden failures associated with protective functions, such as pressure safety valves, which are only required to function when something else fails.

Risk Based Maintenance (RBM)

A strategy using a risk assessment methodology to assign resources to assets where $\text{Risk} = \text{Likelihood} \times \text{Consequence}$.

Risk Based Inspection (RBI)

A specific application of Risk Based Maintenance typically applied to static equipment like vessels, piping, or pressure relief valves.

Condition Based Maintenance (CBM)

A strategy that looks for physical evidence that a failure is occurring or about to occur, based on the fact that most failure modes give a warning rather than being strictly age-related.

P-F Curve

A curve illustrating how equipment performance degrades over time from $\text{P}$ (potential failure detected) to $\text{F}$ (functional failure).

P-F Interval

The lead time to failure, which is the time available between the detection of a potential failure and the point of functional failure for condition monitoring and maintenance actions.

Predictive Maintenance (PDM)

An advanced approach to CBM that uses process parameters from online sensors to determine if equipment is moving away from stable operating conditions toward failure.

Deferred Maintenance

Corrective maintenance activities that are not immediately initiated after a failure but are delayed in a way that will not affect the production process.

Shutdown Corrective Maintenance

A set of corrective maintenance activities performed specifically when the production line is in a total stoppage situation.