Damage mechanism

A damage mechanism is a general cause of problems or failures within process equipment. Examples of damage mechanisms are corrosion under insulation, brittle fracture, thermal fatigue, and heat damage.

	See Also

Abbreviation

Abbreviated name of the damage mechanism.

	See Also

Failure Mode

A failure mode is an event that causes an asset to fail to perform its function. For example, if a pump’s impeller becomes worn, the pump cannot convey liquid at the required rate. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause description in AWB.

	See Also

H - Evident

If the failure consequence is evident, select Yes. If it is hidden, select No. A hidden failure does not become apparent to the operating crew under normal circumstances if the failure mode occurs on its own.

	See Also

Strategy

Possible strategies on an RBI failure mode are: • Inspections entails examination and/or testing to determine the physical and metallurgical condition of equipment in terms of fitness-for-service. • Monitor indicates that proactive tasks are performed to find problems before they occur, for example, monitoring inhibitor injection rates. • Strategy is selected for failure modes that require more complex responses, for example, two or more types of inspection. • Modification/redesign is any one-time change to the equipment, training, maintenance or operating procedures, and so on. • No inspection indicates that no monitoring or mitigation activities are required. • Review existing maintenance is available for secondary action plans only. This strategy alerts the analysis team to review an asset’s existing maintenance program to identify items that are no longer required. • Not specified means that an action type has not been determined.

	See Also

Theoretical yearly rate

Theoretical rate is the estimated rate of deterioration based on expert opinion, equipment specifications, or historical data. It can differ from the asset design rate based on the analysts’ experience and expectations.

	See Also

Selected yearly rate

Degradation rate selected on the failure mode to apply to the failure mode’s indicator.

	See Also

Selected rate

Select a degradation rate from the list to calculate the next inspection date.

	See Also

Task Type

Types of tasks for MTA2 and RCM2 analyses are: • Scheduled Restoration/Discard: Scheduled restoration entails restoring the initial capability of an existing asset at or before a specified age limit, regardless of its apparent condition at the time. Scheduled discard or replacement tasks entail discarding an asset at or before a specified age limit, regardless of its condition at the time. • Condition-Based Maintenance entails checking for potential failures so that action can be taken to prevent the functional failure or to avoid the consequences of the functional failure. On-condition tasks are so called because the items that are inspected are left in service on the condition that they continue to meet specified performance standards. • Failure-Finding Maintenance involves checking a hidden function at regular intervals to find out whether it has failed. The intervals are calculated based on the required availability of the asset and the reliability of the protected function. • Modification/Redesign is any one-time change to the equipment, training, maintenance or operating procedures, etc. • No Scheduled Maintenance means assets are left in service until a functional failure occurs, at which point they are repaired or replaced. Note: When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Notes 1 property in AWB. Types of tasks for RBI analyses include: • Inspections entails examination and/or testing to determine the physical and metallurgical condition of equipment in terms of fitness-for-service. • Strategy is selected for failure modes that require more complex responses, for example, two or more types of inspection. • Modification/redesign is any one-time change to the equipment, training, maintenance or operating procedures, and so on. • No inspection indicates that no monitoring or mitigation activities are required.

	See Also

Failure finding interval

Interval it is considered safe to wait before performing failure-finding maintenance. The interval is calculated or estimated based on the desired availability and the frequency of failure of the protective device or system. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the inspection task’s PF interval property in AWB.

	See Also

Useful Life

Age at which there is a rapid increase in the conditional probability of failure.

	See Also

PF interval

The PF interval is the time between the point at which a potential failure becomes detectable and the point at which it degrades into a functional failure. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the inspection task’s PF interval property in AWB.

	See Also

Modification type

The modification type for the modification/redesign recommended task. Examples are Maintenance procedure, Training, and Physical. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the cause’s Redesign description property in AWB.

	See Also

Trade

Type of trades person who will perform the action. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the Labor ID in AWB.

	See Also

Frequency

Frequency with which the recommended action needs to be performed. When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to the inspection task’s Interval property in AWB.

	See Also

Duration

Time required to complete the recommended action.

	See Also

Technology

PdM technology used in the performance of the action.

	See Also

Operating condition

Operating condition of the asset when the action is performed.

	See Also

CMMS Reference

Reference that identifies the CMMS task for the action plan.

	See Also

CMMS Task Exists

Indicates if a CMMS task exists for the action plan.

	See Also

Indicators and states notes

Collection instructions and other information about the indicators required for this action plan.

	See Also