LOPA Tab

This LOPA tab is used to do the actual  the Layer of Protection Analysis (LOPA) . Here you can define  Initiating Events  (and Frequencies), as well as the  Barriers  (and  PFDs ). Then you can calculate and e...

The LOPA Tab Toolbar can be used to add Initiating Events and Barriers . Also SIFs can be added from here, and this also also from where you can start a calculation. These functions also have associated shortcut keys . The Toolbar func...

The Initiating Events and Barriers grid is organized as cards (cells). Several keyboard shortcuts have been enabled to accelerate the navigation and the editing of the cells, like in an Excel worksheet. These are summarized in the table below. The ...

The different Consequence Categories ( People , Assets , Community , and Environment ) together with their associated Severity , and Tolerability Criteria per year ( TC ) are shown. For each Consequence category a Safety Integrity Level (SIL) ...

Initiating Events copied from the Consequence’s  associated HAZOP, will show here. These will be indicated with an . If applicable you can create more Initiating Events or change the existing ones (the changes will be synced back to the ...

Barriers , copied from the Consequence’s associated HAZOP, will show here. These will be indicated with an . If applicable you can create more Barrier or change the existing ones (the changes will be synced back to the HAZOP ). The Initiati...

When all the Initiating Events and Barriers have been defined it is time to calculate and review the Overall SIL. Click the calculate button. Note : It will show red  when a calculation is required. Evaluate the Overall SIL to ...

If the Overall SIL for the Consequence  is not acceptable, you will need to add one or more SIF Analyses and determine (for each SIF Analysis) the minimum required RRF, i.e., its Target PFD , that achieves an acceptable Overall SIL  ...

The aim of a SIF Analysis is to design the Subsystems such that the Achieved PFD is equal or higher than the Target PFD . The Target PFDs are typically established during the LOPA study. In some cases, a SIF Analysis can be started independen...

First you need to make sure the Team Composition has been documented, then you can Approve the LOPA. When the LOPA is Approved and changes are now made in the associated HAZOP, a Syncing warning will show on the LOPA. If desired, you can then ...

When a LOPA has been created and linked to a Consequence in a HAZOP , then the following will be synced: The Consequence and highest Risk (Severity*Likelihood) among the associated Consequence categories. The associated Cause(s)  (H...