Which statement best describes a process hazard?

• A. A minor nuisance that does not threaten safety.
• B. A financial risk unrelated to safety.
• C. A potential source of harm arising from the process design or operation that could cause release of toxic substances, fire, or explosion.
• D. A hazard only relevant during maintenance.

Answer: (C)

In process safety, a process hazard is a potential source of harm that comes from the way a process is designed or operated, capable of causing something like a toxic release, a fire, or an explosion if not properly controlled. This concept matters because hazards are about possible harm, not just nuisances or financial risk, and they aren’t limited to maintenance activities. For example, a pressurized vessel containing flammable or toxic materials represents a process hazard because a leak, overpressure, or control failure could lead to a dangerous release or ignition. Similarly, an exothermic reaction with the potential to run away poses a hazard due to unexpected energy release. Understanding this helps focus risk assessments and the preventive controls needed to keep operations safe.