Question 449Steam Plants - Assistant Engineer

The correct answer is B) Pilot actuated safety valve for the superheater safety valve. On a boiler equipped with pilot actuated safety valves, the pilot actuated safety valve for the superheater safety valve will be actuated first. This is because the superheater safety valve is designed to protect the superheater, which is a critical component of the boiler system. The pilot actuated safety valve for the superheater safety valve is calibrated to open at a lower pressure than the drum safety valve, ensuring that the superheater is protected before the entire boiler system. The other options are incorrect because the drum safety valve (A) and the superheater safety valve (C) are not the first to be actuated, and the pilot actuated safety valve for the drum safety valve (D) is not the correct valve that will be actuated first.