A common cause failure is a failure or condition within a plant that can affect the operation of multiple instrumented functions. SIF Common Cause Failures must be linked to at least two Instrumented Functions. In other words, for every SIF Common Cause Failure, there will be at least two Instrumented Function records that represent the instrumented functions that are affected by the common cause failure defined in the SIF Common Cause Failure record.
You can manage SIF Common Cause Failure records via the Common Cause Failures section of the Instrumented Function. Using the Common Cause Failures section, you can specify the common cause failures that exist for the current instrumented function and other instrumented functions that are defined in the GE Digital APM database. More specifically, to define a common cause failure, you will need to:
The following illustration shows the records that will exist for a given common cause failure scenario.
Incorrect maintenance of sensors can affect multiple instrumented functions. In this case, you would first create an SIF Common Cause Failure to document incorrect maintenance of sensors as a common cause failure, and then link that SIF Common Cause Failure to the Instrumented Function records that would be affected by the incorrect sensor maintenance.
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