Question 229Safety & Environmental - QMED

The correct answer is B) water. Water is the most common cooling agent used for fighting fires on tank vessels. This is because water is an effective way to cool the surrounding area and prevent the fire from spreading. Water can absorb a large amount of heat, which helps to extinguish the fire and protect the vessel's structure. The other options are incorrect because: A) carbon dioxide is more commonly used for firefighting in enclosed spaces, C) flue gas is not a common firefighting agent, and D) steam smothering is not a widely used method for fighting fires on tank vessels.