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Assess the Safety Integrity Level (SIL) via a Layer of Protection Analysis (LOPA)

This topic describes how to assess the SIL level for an Instrumented Function using a LOPA.

Before You Begin

• Create a LOPA to define the risk that you are assessing.

Steps

1. Access the Instrumented Function for which you want to assess the SIL value.

2. In the workspace, select the SIL Assessment tab.

   The SIL Assessment section appears. The Assessment Details tab is selected by default.

   

3. In the lower-right corner of the Assessment Details subsection, select Add Assessment, and then select LOPA Internal.

   A blank LOPA Assessment datasheet appears.

   

4. As needed, enter values in the available fields.

   Note: In the Linked LOPA ID field, you can only link LOPA records that are in Complete state.

5. In the upper-right corner of the datasheet, select .

   The LOPA Assessment is saved, and the SIL level for the Instrumented Function is assessed using LOPA.

Results

• In the Assessment Details subsection, the LOPA that you have created appears in list of SIL assessments.
• In the Assessment Details subsection, for the row that contains the LOPA that you created, the SIL level that is calculated in the LOPA appears in the SIL Level column.
• A copy of the Risk Assessment associated with the LOPA is created and linked with the LOPA Assessment.
• Any change to the linked LOPA will reflect in the associated LOPA Assessment when the state of the LOPA is changed to Complete.

What's Next?

• Associate an SIL Assessment with an Instrumented Function

• About Integration between SIS Management and LOPA

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