---
title: "LOPA Tab - Layout"
slug: "layout"
updated: 2026-10-27T23:12:18Z
published: 2026-10-27T23:12:18Z
canonical: "ims-handbook.cenosco.com/layout"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://ims-handbook.cenosco.com/llms.txt
> Use this file to discover all available pages before exploring further.

# LOPA Tab - Layout

![lopa-tab-image-b9nkabsx](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/lopa-tab-image-b9nkabsx.png?sv=2026-02-06&spr=https&st=2026-10-28T17%3A31%3A58Z&se=2026-10-28T18%3A31%3A58Z&sr=c&sp=r&sig=uzE0OiRNFjoCQ%2B3MCm3ixkBKnfbAcK6C2IIBfoMoexs%3D)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 evaluate the Overall SIL to determine the adequacy of the existing or proposed Barriers against the Hazard Scenario.

The LOPA tab (see image below) shows the following:

1. The Assessment Summary shows the Consequence Categories with associated Severities and the calculated Safety Integrity Levels (SILs). See [Assessment Summary](/v414/docs/assessment-summary-lopa).
2. If the Consequence is associated with a HAZOP, the information from the HAZOP will show here, e.g., HAZOP name (hyperlink), Consequence name (hyperlink), Consequence Description, and ALARP notes.
3. The Toolbar. It is related to the Initiating Events and Barriers.  For more information on the functions see [Toolbar](/v414/docs/the-toolbar). These functions also have associated [shortcut keys](/v414/docs/lopa-tab-keyboard-shortcuts).
4. The Initiating Events (and their Frequencies). See [Defining Initiating Events](/v414/docs/defining-initiating-events).
5. The Barriers and their PFDs. See [Defining Barriers](/v414/docs/defining-barriers-lopa).

![](https://cdn.document360.io/e492a0e0-a4ba-4aca-8fc6-76b95f91fdf3/Images/Documentation/layout-image-xsup973f.png?sv=2026-02-06&spr=https&st=2026-10-28T17%3A31%3A58Z&se=2026-10-28T18%3A31%3A58Z&sr=c&sp=r&sig=uzE0OiRNFjoCQ%2B3MCm3ixkBKnfbAcK6C2IIBfoMoexs%3D)The General Tab’s layout.