BowTiePro uses Threat Frequency values in LOPA assessments to estimate how often a threat is expected to occur before safeguards and protection layers are applied. Threat frequency is one of the core components used in LOPA calculations and directly affects the overall risk evaluation of a scenario. The frequency value works together with: Enabling factors Condition modifiers Independent protection layers (IPLs) Probability of Failure on Demand (PFD) to calculate the

Enabling factors in BowTiePro are conditions or circumstances that increase the likelihood of a threat occurring. These factors are linked to threats within a LOPA assessment and help provide more accurate and realistic risk evaluations. Enabling factors are commonly used to represent: Human errors Environmental conditions Equipment issues Operational weaknesses Process limitations Adding enabling factors helps organizations better understand the conditions that may contribute to incidents. Opening the Threat Details

Condition modifiers in BowTiePro are factors that influence the likelihood or effectiveness of risk scenarios within a LOPA (Layer of Protection Analysis) assessment. These modifiers help organizations account for additional operational or environmental conditions that may impact the overall risk calculation. Condition modifiers are commonly used for: Human performance conditions Environmental influences Operational complexity Temporary process conditions Special operational situations Using condition modifiers helps create more realistic and accurate LOPA

In BowTiePro LOPA assessments, controls are assigned PFD (Probability of Failure on Demand) values to calculate how effective a safeguard is at reducing risk. PFD values represent the likelihood that a control may fail when required during a hazardous event. Accurate PFD values are essential for: Reliable LOPA calculations Proper safeguard evaluation Risk reduction analysis SIL (Safety Integrity Level) assessment Operational safety planning Opening the LOPA Diagram To configure control

In BowTiePro LOPA assessments, the overall consequence value represents the final calculated risk associated with a specific consequence after considering threats, controls, enabling factors, and condition modifiers. This value helps users understand whether the remaining risk level is acceptable or if additional protection layers are required. Viewing Consequence Values To review consequence values: Open the LOPA module. Open an existing LOPA assessment. Navigate to the LOPA Details page. Scroll down

After configuring threats, controls, enabling factors, and condition modifiers, BowTiePro calculates the final Layer of Protection Analysis (LOPA) results. These results help users determine whether existing safeguards reduce risk to acceptable levels. Viewing LOPA Results To review LOPA results: Open the LOPA module. Select an existing LOPA assessment. Review the assessment list and detailed analysis screens. The LOPA List page provides a quick overview of all assessments, including: Hazard Threat