Question 166Steam Plants - 1st Asst/Chief70% to pass
A water-tube boiler can be laid up either wet or dry. If it is to be laid up wet, you should _______________.
AI Explanation
The correct answer is C) completely fill the boiler with deaerated feed water and maintain a slight pressure.
When a water-tube boiler is laid up wet, it should be completely filled with deaerated feed water and a slight pressure should be maintained. This helps prevent corrosion and oxidation of the internal surfaces by keeping air out of the boiler. Draining and refilling the boiler periodically (options A and B) is not necessary when it is properly laid up with deaerated water and a slight pressure. Blowing down to the steaming level (option D) would leave part of the boiler exposed to air, increasing the risk of corrosion.
Related Questions
#164 Which type of waterside deposits can normally be removed by chemically boiling out a boiler? #165 Steam line water hammer can be best prevented by _______________.#167 One boiler of a two boiler plant has ruptured a tube and the water cannot be maintained in sight in the gage glass. After securing the fires, your next action should be to _______________.#168 Under EMERGENCY operating conditions, the proper valve positions for controlling feed water to the boiler should be the _______________.#169 In the event of a failure of the pneumatic control system, a multi-element feed water regulator is designed to operate as a _______________.