Question 234Steam Plants - 1st Asst/Chief70% to pass
In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level?
AI Explanation
The correct answer is B) Marine growth on the cooling water side of the main condenser.
Marine growth on the cooling water side of the main condenser can prevent the vacuum from reaching the desired level. This is because the marine growth reduces the heat transfer efficiency of the condenser, leading to a higher backpressure and a lower vacuum level. The other options are not directly related to the vacuum level in a closed feed and water cycle.
A) is incorrect because the steam pressure to the air ejectors is not a factor in determining the vacuum level in the condenser.
C) is incorrect because the recirculation of condensate during maneuvering does not affect the vacuum level.
D) is incorrect because steam leaking from the turbine glands would not prevent the vacuum from reaching the desired level.
Related Questions
#232 The water level in a steaming boiler has risen to within 2 inches from the top of the gage glass. Your immediate action should be to _______________.#233 Excess free oxygen in the boiler feed water can be the result of _______________.#235 On a steam vessel, if a centrifugal main feed pump were operating at shutoff head with the recirculating line closed, which of the following conditions could occur? #236 Which of the conditions listed may be indicated by the lifting of the DC heater relief valve? #237 The second engineer reports to you as the Chief Engineer that there is an increased use of oxygen scavenging chemicals in a boiler. Which of the following could be a possible cause?