LOPA Assessment records store information that is mapped from the LOPA that you use to assess the SIL level of an Instrumented Function. This topic provides an alphabetical list and description of the fields that exist for the LOPA Assessment family and appear on the LOPA Assessment datasheet. The information in the table reflects the baseline state and behavior of these fields. This list is not comprehensive.
This family is enabled for site filtering, which means that records in this family can be assigned to a specific site, and will then only be accessible to users who are assigned to the same site and have the appropriate license and family privileges. See the Site Filtering section of the documentation for more information on using this feature.
|
Field |
Data Type |
Description |
Behavior and Usage |
|---|---|---|---|
| LOPA Assessment ID | Character | Indicates the identification for the LOPA. |
This field is required and must be unique among all the LOPA records linked to an Instrumented Function. Otherwise, an error message appears. You can enter a value manually. The value will appear in the list of assessments for an Instrumented Function and is used to distinguish the LOPA from the others. |
| LOPA Description | Character | Specifies a description for the LOPA. | This field appears on the LOPA Assessment datasheet. |
| Linked LOPA ID | Character | Indicates the identification of the LOPA that is linked to the instrumented function. |
You can select a LOPA to associate with the LOPA Assessment record. You can link only LOPA records that are in Approved state. |
| Frequency of Initiating Event | Numeric | Indicates the number of times in a year an initiating event specified in the Initiating Event Type field in the LOPA record will occur. |
This field is automatically populated with the value in the Frequency of Initiating Event field in the LOPA record that is associated with the Instrumented Function. This field does not appear on the datasheet. |
| Mitigated Consequence Frequency | Numeric | Indicates the frequency of the mitigated consequence (i.e., the frequency of consequence after layers of protection have been added). |
This field is automatically populated with the value in the Mitigated Consequence Frequency field in the LOPA record that is associated with the Instrumented Function. This field does not appear on the datasheet. |
| Required Mitigated Consequence Frequency | Numeric | Indicates the maximum allowable frequency at which the initiating event can occur for the risk that is described in the Unacceptable Consequence field in the LOPA record. |
This field is automatically populated with the value in the Required Mitigated Consequence Frequency field in the LOPA that is associated with the Instrumented Function. This field does not appear on the datasheet. |
| Required Probability of Failure | Numeric | Indicates the target probability that a failure will occur. |
This field is automatically populated with the value in the Required PIF PFD field in the LOPA that is associated with the Instrumented Function. This field does not appear on the datasheet. |
| Risk Reduction Factor (RRF) | Numeric | Indicates the factor by which the risk should be reduced. |
This field is automatically populated with the value in the Required PIF Risk Reduction Factor field in the LOPA that is associated with the Instrumented Function. |
| Selected SIL | Numeric | The SIL value that is required to mitigate the risk that is associated with the Instrumented Function to which this LOPA is linked. |
This field is automatically populated with the value in the Calculated SIL field in the LOPA that is associated with the Instrumented Function. |
| Total IPL PFD | Numeric | The PFD value that is associated with all the IPLs associated with the LOPA. |
This field is automatically populated with the value in the Total IPL PFD field in the LOPA record that is associated with the Instrumented Function. This field does not appear on the datasheet. |
| Unmitigated Consequence Frequency | Numeric | Indicates the frequency of unmitigated consequence (i.e, the frequency consequence before the layers of protection have been added). |
This field is automatically populated with the value in the Unmitigated Consequence Frequency field in the LOPA record that is associated with the Instrumented Function. This field does not appear on the datasheet. |
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