When must operations personnel shut down a pipeline based on pressure levels?

The correct response is based on established safety protocols and regulations concerning pipeline operation. Shutting down a pipeline at 110% of the Maximum Operating Pressure (MOP) is a precautionary measure that aims to prevent potential hazards such as leaks, ruptures, or equipment failures. Exceeding MOP pressure levels raises significant risks, including structural damage to the pipeline and compromised safety for personnel and the environment.

When operations personnel follow guidelines that dictate shutting down at 110% MOP, they are adhering to safety standards designed to protect the integrity of the pipeline system and mitigate risks associated with overpressure events. This practice demonstrates a proactive approach to risk management by ensuring that any abnormal fluctuations in pressure are addressed before they can lead to more severe consequences.

While the other options mention various pressure levels, 110% MOP remains the threshold recognized for action. Shutting down only during routine maintenance would not adequately address potential dangers associated with high-pressure conditions during regular operations. Thus, the decision to set a shutdown point at 110% MOP effectively balances operational efficiency with safety concerns.