Question 306Steam Plants - Assistant Engineer

The correct answer is A) dripping atomizers. The accumulation of fuel oil in the boiler double casing is most likely caused by dripping atomizers. Atomizers are responsible for spraying the fuel oil into the boiler, and if they are malfunctioning and dripping, the excess fuel oil can accumulate in the double casing. The other options are incorrect because: B) leaking fuel oil strainers would not directly lead to fuel oil accumulation in the boiler casing; C) high atomizing steam pressure may cause other issues but not necessarily fuel oil accumulation; and D) faulty steam atomizer return traps would not be the primary cause of this issue.