Qualitative / Deterministic Risk Assessment

Deterministic risk assessments play a critical role in demonstrating the adequacy of safety systems and engineering decisions across a facility’s full lifecycle — from design and construction to operation and decommissioning. At PID, we conduct scenario-based evaluations to analyze potential accident sequences and verify that safety barriers are clearly defined, appropriately implemented, and proportionate to the level of hazard involved.

These studies ensure that no single failure can compromise essential safety functions, by applying principles of redundancy, segregation, independence, and diversity. We support engineering teams in validating design basis criteria, confirming operational safety limits, and ensuring alignment with project safety philosophies.

Our deterministic risk evaluations often underpin safety case development, risk management documentation, and regulatory compliance. When quantitative data is scarce — or when transparency of engineering judgment is paramount — qualitative methods such as ALARP demonstration, bowtie modeling, and structured risk matrices provide the necessary rigor and traceability.

Our services include:

• Scenario development and initiating event pathways
• Risk assessment matrix definition and qualitative risk ranking
• Scenario-based safeguard evaluation (Deterministic LOPA)
• Hazard and Operability (HAZOP) studies
• Functional segregation, redundancy, and independence assessment
• Bowtie modeling and barrier visualization
• Human Factor Engineering (HFE)
• Human-system interaction and task analysis
• Safety Critical Element (SCE) identification
• Emergency Systems Survivability Assessment (ESSA)
• Escape, Evacuation, and Rescue Analysis (EERA)
• ALARP demonstration and risk tolerance justification
• Risk reduction action tracking and closure management
• Training courses