Question 198Safety & Environmental - 1st Asst/Chief

The correct answer is B) after the shore pumps are stopped. When a fuel oil tank is being topped off during bunkering operations, the tank valve should be closed after the shore pumps are stopped. This is to prevent an overflow of fuel oil, which can be a serious fire hazard and environmental concern. Closing the tank valve before the shore pumps are stopped could lead to a sudden surge in pressure and flow, potentially causing damage to the piping system or equipment. The other answer choices are incorrect: A) Closing the tank valve rapidly is not recommended, as it can also lead to surge stresses. C) Preventing gas from escaping through the pressure-vacuum relief valves is not the primary reason for closing the tank valve. D) Closing the tank valve slowly is not the correct approach, as the key is to close it after the shore pumps have been stopped.