Question 113Steam Plants - Assistant Engineer

The correct answer is C) Shift over to the standby heater and monitor contaminated drain tank for additional traces of oil. This is the correct answer because finding oil in the main fuel oil heater steam drain system indicates a potential leak or contamination issue. The first step should be to shift over to the standby heater to isolate the problem and monitor the contaminated drain tank for any further signs of oil. This allows the crew to quickly respond to the issue without disrupting the main fuel supply or boiler operation. The other options are not the best first actions - changing over to diesel fuel (A) or shifting to the low fuel oil suction (D) could mask the underlying issue, while bottom blowing the boiler (B) may not directly address the contamination problem.