How should external risks influence process safety management?

• A. External factors have no impact on process safety management.
• B. Only internal process changes drive risk; external factors are irrelevant.
• C. External factors like supplier changes, energy supply, or regulatory changes can alter risk profiles and require adaptation of controls and MOC.
• D. External factors only affect maintenance schedules.

Answer: (C)

External risks must be considered in process safety management because hazards and their likelihoods can change when the wider operating context shifts. Suppliers can alter the materials' properties or quality, energy or utility supplies can experience interruptions or fluctuations, and new or revised regulations can demand different procedures, controls, or training. When these external factors change, the risk profile changes as well, so controls and the Management of Change process must be updated to keep safety outcomes within acceptable limits. For example, a different supplier might introduce different impurities that affect reaction conditions, an energy outage could push the process into an abnormal state not covered by existing procedures, and a regulatory update might require new alarm settings or permits. This is why external factors are integrated into risk assessment, control design, and change management. The other statements ignore how interconnected the process is with its external environment and would miss critical opportunities to maintain safe operations; external factors do not only relate to maintenance schedules and cannot be dismissed as irrelevant.