What is a Process Hazard Analysis (PHA) and how does HAZOP relate to it?

• A. PHA is a systematic assessment of hazards and risks at a process; HAZOP is a common method used within PHA to systematically examine possible deviations from design intent and associated consequences.
• B. PHA is a checklist-based compliance review; HAZOP is a separate incident response procedure.
• C. PHA focuses only on equipment reliability; HAZOP analyzes financial risk.
• D. PHA and HAZOP are the same type of risk assessment.

Answer: (A)

Process Hazard Analysis is a systematic, comprehensive assessment of hazards and risks in a chemical process, looking at what could go wrong, the potential consequences, how likely those events are, and what safeguards exist or are needed. HAZOP, Hazard and Operability study, is a common method used within a PHA. It provides a structured, team-based way to examine possible deviations from design intent and the resulting consequences by applying guidewords to process parameters and scrutinizing causes, safeguards, and operability issues. This makes HAZOP a technique used inside the broader PHA framework, not a separate or entirely opposite activity. It’s broader than a simple checklist or compliance review, and it isn’t limited to equipment reliability or financial risk.