When a fuel oil tank is being topped off...

Question 1 / 270705eccef9dbacbc34ba4d45c74

Question 1 of 270705eccef9dbacbc34ba4d45c74

When a fuel oil tank is being topped off during bunkering operations, the tank valve should be closed __________.

Question 1 of 27070

When a fuel oil tank is being topped off during bunkering operations, the tank valve should be closed __________.

🔍 Key Concepts

• Bunkering operations safety procedures • Effects of closing a valve too fast on liquid in a pipeline (water hammer/surge)** • Proper sequence of shutting down: valves vs. pumps/shore supply

💭 Think About

• What happens inside the pipeline and tank if you close a valve very suddenly while liquid is still being pumped at a high rate? • In a normal, safe bunkering shutdown, which should generally happen first: stopping the flow at the source or closing the receiving tank’s final valve tight? • Why do we care about surge stresses or ‘hammer’ in fuel lines when loading a nearly full tank?

✅ Before You Answer

• Consider how surge pressure (water hammer) is created and how to reduce it. • Think about the order of operations when stopping bunkering: communication with shore, pump shutdown, then valve positions. • Ask whether the purpose of the vent/pressure‑vacuum valve is to let gas escape safely, not to trap it.

Question 1 of 27070

When a fuel oil tank is being topped off during bunkering operations, the tank valve should be closed __________.

slowly to prevent surge stresses

to prevent gas from escaping through the pressure-vacuum relief valves

after the shore pumps are stopped

rapidly to prevent overflow

Question 1 / 270705eccef9dbacbc34ba4d45c74

Question 1 of 270705eccef9dbacbc34ba4d45c74

When a fuel oil tank is being topped off during bunkering operations, the tank valve should be closed __________.

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Question 1 of 27070

When a fuel oil tank is being topped off during bunkering operations, the tank valve should be closed __________.