In the Management of Change process, is HAZOP always required?

• A. True
• B. Depends on the change
• C. False
• D. Only for plant modifications

Answer: (C)

In managing change, the review level is guided by the potential risk the change could create. HAZOP is a powerful, structured method for identifying process hazards, but it isn’t required for every change. The MOC process uses a tiered approach: for minor, low-risk changes (for example, administrative updates or changes that don’t affect process conditions or equipment), a simple risk-based review or checklist is often enough. For more significant changes—such as modifications that alter operating conditions, introduce new materials, or change equipment or control strategies—a formal HAZOP (or another thorough hazard evaluation) is appropriate to systematically uncover possible deviations and their consequences and to ensure safeguards are in place.

So, HAZOP is not always required; its use depends on how the change could impact process safety.