Question 16 TK02 - Tank Vessel Assistant - Liquefied Gas

The Correct Answer is B **Explanation for B (Final topping off is occurring):** Final topping off is the most critical time during bunkering because the remaining space in the receiving tank is minimal, and the flow rate is often slowed down significantly. However, even with reduced flow, if communication is faulty, gauges are misread, or the valve closure is delayed, the margin for error is extremely small. The tank can quickly reach its absolute capacity, leading to immediate overflow (spillage) through vents or sounding pipes. This stage demands the highest vigilance and coordination. **Why the other options are incorrect:** * **A) Hoses are being disconnected:** While there is a risk of residual oil spillage from the hoses (drip spillage) during disconnection, this volume is typically small and is generally contained by drip trays or coamings. It is not associated with the catastrophic pollution event of a tank overflow. * **C) You first start to receive fuel:** When bunkering first starts, the tank has maximum capacity, providing the largest possible margin for error. The initial phase is controlled and monitored, and any immediate issues (like leaks in connections) can be addressed before significant volumes are transferred. * **D) Hoses are being blown down:** Blowing down hoses transfers residual oil from the line into the receiving tank, minimizing waste. This operation is typically performed at the end of the transfer when the amount of oil remaining is known, and it is usually done at a very slow, controlled rate into a tank that has sufficient remaining capacity. The risk is lower than the risk of exceeding the tank's maximum limit.