Which of the following is not a precaution to be taken while topping off?

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During topping off, the focus is on preventing hazards directly linked to the cargo transfer: overfilling, static discharge, and miscoordination of pumping operations. Monitoring tank level provides real-time data so you can stop the pump before the tank overfills. Clear communications ensure everyone involved—pump operators, deck personnel, and the control room—knows when to start, stop, and monitor the transfer, preventing mistakes that could cause spills or loss of control. Grounding prevents static electricity from igniting vapors during transfer, a critical safety measure in any liquid transfer operation.

Informing the engine room, while important for overall ship safety, does not directly reduce the immediate risks associated with topping off. It doesn’t prevent overfill, eliminate static hazards, or ensure precise coordination of the transfer controls. So, it isn’t considered a direct precaution for the topping-off process.