Question 103Steam Plants - QMED70% 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 D) 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 to the boiler. The auxiliary stop-check valve should then be used to regulate the amount of feed water flow to the boiler, as this valve provides more precise control over the feed water flow rate compared to adjusting the feed pump speed.
The other options are incorrect because they either do not allow for the maximum feed water flow (option A), do not provide the proper control over the feed water flow rate (option B), or do not utilize the auxiliary stop-check valve for flow regulation (option C).
Related Questions
#101 When operating with the auxiliary feed line, feed water flow is controlled _______________.#102 The main feed check valve functions to _______________.#104 The connections labeled "A" in the illustration, are used to SG-0025 #106 Under normal conditions, the rate of heat transfer in a feed water heater is most greatly affected by the _______________.#107 A slight vacuum is maintained in the shell of the first stage heater shown in the illustration. The primary reason for the vacuum is to __ _. Illustration SG-0025