In process safety, which statement about MOC changes and PSM elements is true?

• A. Changes do not affect PSM elements
• B. Changes commonly impact multiple PSM elements
• C. Only one PSM element is impacted
• D. MOC is unrelated to PSM

Answer: (B)

When a change is proposed, it doesn’t just touch one piece of the system. Management of Change is a cross-cutting activity that prompts reevaluation of hazards and risk controls across several PSM elements. For example, changing a material of construction, a process step, or operating conditions may require updating process safety information (like P&IDs and equipment specs), redoing the hazard analysis, revising operating procedures and starting/stopping criteria, updating training, and adjusting mechanical integrity or maintenance plans. It may also affect the permit to operate and emergency response procedures. Because such changes can alter how hazards are controlled, they commonly impact multiple PSM elements.