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.
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Hole size
Description of the hole size appropriate to this failure mode.
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Abbreviation
Abbreviated name of the damage mechanism.
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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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Local Effects
When extended failure effect statements are supported on an analysis, you can enter four separate effect statements for each failure mode:
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Local effect on the piece of equipment
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Intermediate effect on a higher level equipment or asset
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End effect on the asset or system being analyzed
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Worst-case effects
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Intermediate Effects
When extended failure effect statements are supported on an analysis, you can enter four separate effect statements for each failure mode:
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Local effect on the piece of equipment
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Intermediate effect on a higher level equipment or asset
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End effect on the asset or system being analyzed
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Worst-case effects
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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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Strategy
Possible strategies on an RBI failure mode are:
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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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Monitor indicates that proactive tasks are performed to find problems before they occur, for example, monitoring inhibitor injection rates.
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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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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 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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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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