Question 233Steam Plants - 1st Asst/Chief70% to pass
Excess free oxygen in the boiler feed water can be the result of _______________.
AI Explanation
The correct answer is B) improper operation of the DC heater.
Excess free oxygen in the boiler feed water is typically caused by improper operation of the deaerating feed water heater (DC heater). The DC heater is designed to remove dissolved oxygen from the feed water by heating it, which causes the oxygen to be released. If the DC heater is not functioning properly, it will not effectively remove the dissolved oxygen, leading to excess free oxygen in the boiler feed water.
The other options are incorrect because they do not directly contribute to excess free oxygen in the boiler feed water. Improper operation of the gland exhauster, steam leaks through the turbine glands, and vapor lock in the boiler feed pump may have other impacts on the boiler system, but they do not specifically result in excess free oxygen in the feed water.
Related Questions
#231 If a boiler generates saturated steam at 125.3 psig, how much heat is required to change the water into steam if the feed water temperature is 240°F? Illustration SG-0004 #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 _______________.#234 In a closed feed and water cycle, which of the conditions listed could prevent vacuum from reaching the desired level? #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?