Question 87Steam Plants - Assistant Engineer

The correct answer is A) the boiler is supplying auxiliary steam. When a boiler is being placed on the line, the superheater vent can be closed once the boiler is supplying auxiliary steam. This allows the boiler to start heating the superheater coils and bring the superheated steam up to temperature before it is introduced into the main steam system. The other options are incorrect because: B) warming up the steam stops does not necessarily indicate the boiler is ready to supply steam; C) opening the drains does not mean the superheater vent can be closed; and D) 5 psi above line pressure is not the specific criterion for closing the superheater vent.