Function
A function is whatever the asset is required to do. For example, the function of a truck might be to transport up to one tonne of freight at a maximum highway speed not less than 90 km/h. Each asset can have several functions but just one primary function.
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Functional failure
Description of the functional failure.
When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to functional failure description in AWB.
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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.
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Failure effect
A failure effect is the consequence of a failure mode. For example, when a pump’s impeller becomes worn (failure mode), the flow through the pump declines until it no longer delivers liquid at the required rate.
When failure mode optimization requires Isograph Availability Workbench, this attribute is mapped to project effect description.
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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.
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1 - On-condition task
This task 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.
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H4 - Failure finding
This task 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. This strategy applies when the failure effect is hidden.
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S - Safety
There is an unacceptable risk that the effects of the failure mode could kill or injure someone.
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2 - Scheduled restoration
The scheduled task restores the capability of an asset at or before a specified interval (age limit), regardless of its condition at the time, to a level that provides a tolerable probability of survival to the end of another specified interval.
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H5 - Multiple failure
A multiple failure occurs if a protected function fails while its protective device or protective system is in a failed state. This option applies when the failure effect is hidden.
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E - Environmental
There is an unacceptable risk that the effects of this failure mode could breach a known environmental standard or regulation.
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3 - Scheduled discard
The scheduled task entails discarding an asset at or before a specified age limit, regardless of its condition at the time.
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S4 - Combination of tasks
If a failure mode or a multiple failure could affect safety or the environment and no scheduled task on its own reduces the risk of failure to an appropriate level, a combination of tasks (usually from two different task categories, such as an on-condition task and a scheduled discard task), might be needed. This strategy applies to safety and environmental consequences.
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O - Operational
The failure mode has a direct adverse effect on the operational capability of the asset (output, product quality, customer service, military capability, or operating costs in addition to the cost of repair). A non-operational failure does not adversely affect safety, the environment, or operations, but repair or replacement is required for any item(s) that may be affected by the failure.
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Recommended strategy
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Do the on-condition task: 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.
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Do the scheduled restoration task: 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.
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Do the scheduled discard task: Scheduled discard or replacement tasks entail discarding an asset at or before a specified age limit, regardless of its condition at the time.
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Do a combination of tasks: If a failure mode could affect safety or the environment and no scheduled task on its own reduces the risk of failure to an appropriate level, a combination of tasks (usually from two different task categories, such as an on-condition task and a scheduled discard task), might be needed. This strategy applies to safety and environmental consequences.
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Do the failure-finding task: Failure-finding maintenance involves checking a hidden function at regular intervals to find out whether it has failed. Intervals are calculated based on the required availability of the asset and the reliability of the protected function.
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Redesign is compulsory or desirable: Modification or redesign is any one-time change to the equipment, training, maintenance or operating procedures, etc.
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No scheduled maintenance: No scheduled maintenance means assets are left in service until a functional failure occurs, at which point they are repaired or replaced.
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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.
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Not analyzed: Not anlayzed means that an action type has not been determined.
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Analyze separately
The failure mode is outside the scope of the current analysis.
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Recommended strategy
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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.
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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.
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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.
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Modification/redesign is any one-time change to the equipment, training, maintenance or operating procedures, etc.
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No scheduled maintenance means assets are left in service until a functional failure occurs, at which point they are repaired or replaced.
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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.
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Not specified is the default task, and it means that an action type has not been determined.
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Task Type
Types of tasks for MTA2 and RCM2 analyses are:
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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.
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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.
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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.
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Modification/Redesign is any one-time change to the equipment, training, maintenance or operating procedures, etc.
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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:
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Inspections entails examination and/or testing to determine the physical and metallurgical condition of equipment in terms of fitness-for-service.
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Strategy is selected for failure modes that require more complex responses, for example, two or more types of inspection.
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Modification/redesign is any one-time change to the equipment, training, maintenance or operating procedures, and so on.
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No inspection indicates that no monitoring or mitigation activities are required.
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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.
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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.
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Operating condition
Operating condition of the asset when the action is performed.
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Technology
PdM technology used in the performance of the action.
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Duration
Time required to complete the recommended action.
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CMMS Reference
Reference that identifies the CMMS task for the action plan.
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CMMS Task Exists
Indicates if a CMMS task exists for the action plan.
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Type
Type of work identification analysis, for example, maintenance task analysis, RCM2 analysis, or Current practice review.
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Title of the analysis
Title of the current strategy development analysis.
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