Question 168Steam Plants - 1st Asst/Chief

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 priority is to ensure a reliable feed water supply to the boiler. With the auxiliary stop valve fully open, it provides an unobstructed path for the feed water to enter the boiler. The auxiliary stop-check valve can then be used to regulate the amount of feed water flow, allowing the operator to adjust the flow as needed to maintain the proper water level in the boiler. The other options are incorrect because they either do not provide the full flow path (C and D) or require using the feed pump speed to regulate the flow (B), which may not be as precise or responsive as using the auxiliary stop-check valve.