Assess if a Safeguard is an Independent Protection Layer (IPL)

Steps

Access the Safeguard that you want to assess to determine whether it is an IPL.
Select the IPL Checklist tab.

The IPL Checklist section appears, displaying a set of criteria to identify if the Safeguard is an IPL.
In the IPL Checklist section, next to each criteria that is applicable for the selected Safeguard, select the check box.

The IPL Type box and the IPL Sub Type box are enabled.

Note: The IPL Type box and the IPL Sub Type box are enabled only if the check box for all the criteria in the IPL Checklist section is selected.
As needed, select values in the available fields.
In the upper-right corner of the workspace, select .

The Safeguard is specified as an IPL.

Results

Based on your selection in the IPL Type and IPL Sub Type fields, the Probability of Failure on Demand (PFD) value is calculated for the safeguard.
In the Summary section of the LOPA Summary workspace, the Probability column for the row containing the Safeguard is updated with the calculated PFD value.
In LOPA, the Total IPL PFD field is updated with the calculated PFD value. If there are more than one IPL for the same LOPA, then the Total IPL PFD value is calculated by multiplying the values in the PFD field of each Safeguard associated with the LOPA.