Question 175Steam Plants - Assistant Engineer

The correct answer is D) there is no steam flow through the superheater. If there is no pressure drop across the superheater, it indicates that there is no steam flow through the superheater. Without steam flow, the superheater would not be able to superheat the steam, and there would be no pressure drop. This is the normal condition when the boiler is not generating enough steam to require superheating. The other options are incorrect because: A) The feed water temperature would not affect the pressure drop across the superheater. B) The lack of pressure drop is not a normal condition when the boiler is generating steam. C) The drum safety valve lifting has no direct relation to the pressure drop across the superheater.