How to Access the LOPA Module in BowTiePro | BowTie Pro

The LOPA (Layer of Protection Analysis) module in BowTiePro allows users to create and manage quantitative risk assessments linked to hazards, threats, and consequences. 

Users can access the LOPA module directly from the main navigation menu.

Accessing the LOPA Module

To access the LOPA module:

1. Log in to BowTiePro.
2. From the top navigation menu, click LOPA.

The system will open the LOPA List screen.

Understanding the LOPA List Screen

The LOPA List screen displays all available LOPA assessments for the selected case.

Each row represents a LOPA assessment linked to:

• A hazard
• A threat
• A consequence

The list helps users quickly review the status of existing LOPA analyses.

Available Filters

The top section of the page contains several filters used to narrow down displayed results.

Case

Select the case containing the required LOPA assessments.

Example:

• BowTieExample

Location

Filter LOPA items by location.

Users can:

• Select a specific location
• View all locations

Hazard

Filter assessments by hazard. This helps users quickly locate specific risk scenarios.

Display

The Display filter controls which LOPA items are shown.

Example:

• Only full LOPA items

Understanding LOPA Columns

The LOPA list includes several important columns.

Hazard

Displays the linked hazard.

Example:

• Overfill – High level in tank

Threat

Displays the initiating threat associated with the assessment.

Example:

• Tank level transmitter fails

Consequence

Displays the consequence being evaluated.

Examples:

• Spill
• Fire

Full LOPA

Indicates whether the assessment is configured as a full LOPA analysis.

Met?

Displays whether the calculated result meets the defined acceptance criteria.

Typical values:

• Yes
• No

Colour indicators may also be displayed for quick visibility.

Creating a New LOPA Assessment

To create a new assessment:

1. Click the Create New button.
2. Configure the required hazard, threat, and consequence information.
3. Continue building the LOPA assessment.

Detailed configuration steps are covered in later articles.

Viewing Existing LOPA Assessments

Users can open existing LOPA assessments directly from the list.

This allows users to:

• Review calculations
• Update controls
• Modify frequencies
• Review acceptance status