Question 459Steam Plants - Assistant Engineer

The correct answer is C) fuel oil settler tank. The boiler fuel oil service pump normally takes suction from the fuel oil settler tank. This is because the fuel oil settler tank is where clean, filtered fuel oil is stored and ready for use by the boiler fuel oil service pump. The fuel oil settler tank receives fuel oil that has been purified and separated from water and other contaminants, making it suitable for use in the boiler. The other options are incorrect because: A) the double bottom fuel tanks are the main storage tanks for the vessel's fuel oil supply, not the immediate source for the boiler fuel oil service pump; B) the contaminated drain inspection tank is used to collect and inspect fuel oil and other contaminants, not to provide clean fuel oil to the pump; and D) the fuel oil heater discharge is the output of the fuel oil heater, not the suction point for the boiler fuel oil service pump.