Question 260Steam Plants - 1st Asst/Chief70% to pass
While underway the engineer on watch reports the vacuum in the main condenser has been gradually decreasing. Which of the following could be a possible cause?
AI Explanation
The correct answer is D) High level in the condensate hot well.
A high level in the condensate hot well can cause a decrease in the vacuum in the main condenser. This is because a high level in the hot well restricts the flow of condensate out of the condenser, reducing the vacuum that the condenser is able to maintain.
The other options are incorrect because:
A) Low level in the boiler steam drum would not directly affect the vacuum in the main condenser.
B) Low sea water temperature would actually improve the vacuum in the condenser.
C) High level in the DC heater would not impact the vacuum in the main condenser.
Related Questions
#258 Excessive condensate depression can result in _______________.#259 The duty engineer reports an alarm on the condensate observation tank oil sensor. Which of the following could be a possible cause? #261 Excessively hot water returning to an atmospheric drain tank indicates _______________.#262 If the cooling water flow through the air ejector inter condensers and after condensers is inadequate, which of the problems listed will occur? #263 On a steam turbine vessel with a propeller type, electrically driven, main circulating pump, one suspects condenser tube or inlet tube sheet fouling. Do not consider vacuum variations since they may be due to sea water temperatures. What on-board electrical test instrument can one use to verify condenser fouling?