Question 35Steam Plants - Assistant Engineer
70% to passUnder EMERGENCY operating conditions, the proper valve positions for controlling feed water to the boiler should be the _______________.
Aauxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow
Bauxiliary stop-check valve fully open and the auxiliary stop valve used to regulate the amount of flow
Cauxiliary stop and stop-check valves fully open and the feed pump speed used to regulate the amount of flow
Dauxiliary stop-check valve fully open and the auxiliary stop valve regulated by the feed water regulator
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 to flow into the boiler. The auxiliary stop-check valve should then be used to regulate the amount of feed water flow, as it is the valve designed for this purpose. This ensures the boiler receives the necessary feed water to maintain proper water levels and prevent damage. The other options are incorrect because they either have the valves in the wrong positions (B, D) or rely on an improper method of regulating feed water flow (C).
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