Question 253Steam Plants - Assistant Engineer70% to pass
Under EMERGENCY operating conditions, the proper valve positions for controlling feed water to the boiler should be the _______________.
AI Explanation
The correct answer is A) the auxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow.
Under emergency operating conditions, the auxiliary stop valve should be fully open to allow the maximum amount of feed water flow to the boiler. The auxiliary stop-check valve should then be used to regulate the amount of flow as needed, rather than restricting the flow through the auxiliary stop valve. This ensures the boiler receives the necessary feed water to maintain safe operating conditions during an emergency.
The other options are incorrect because they either have the wrong valves fully open (B and C) or rely on the feed pump speed or a feed water regulator (C and D) to control the feed water flow, which is not the proper procedure under emergency conditions.
Related Questions
#251 With an increase in the saturation pressure of a fluid, the value represented by line "5" on the graph will _______________. Illustration SG-0001#252 In the event of a failure of the pneumatic control system, a multi-element feed water regulator is designed to operate as a _______________.#254 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 _______________.#255 The solenoid valves in the fuel oil supply line to an automatically fired auxiliary boiler are automatically closed by _______________.#256 When the steam pressure drops below a set value on an automatically fired auxiliary boiler, fitted with rotary cup atomizers, the combustion control system will _______________.