Question 253Steam Plants - 1st Asst/Chief70% to pass
During maneuvering on a steam vessel, the condenser vacuum begins to decrease when the turbines are slowed for a slow ahead bell. Which of the following should be checked?
AI Explanation
The correct answer is D) The turbine gland seal steam to ensure proper pressure.
When the turbines are slowed for a slow ahead bell on a steam vessel, the condenser vacuum will decrease. This is likely due to a decrease in the turbine gland seal steam pressure. The turbine gland seals prevent air from entering the condenser, and if the gland seal steam pressure is not maintained, air can leak into the condenser, causing the vacuum to decrease. Checking the turbine gland seal steam pressure is the appropriate step to take in this scenario.
The other options are incorrect because they do not directly address the issue of the decreasing condenser vacuum. Checking the main circulating pump (A) or the condensate pump (B) would not address the root cause of the vacuum decrease. Checking the air ejector (C) may be relevant, but the primary issue is likely with the turbine gland seal steam pressure.
Related Questions
#251 Vapor blowing from the air ejector condenser vent may be caused by _______________.#252 While maneuvering out of port, you answer a stop bell. You notice a lot of steam coming out of the gland exhaust condenser vent, in addition to the main condenser hotwell level being low. For this condition you should _______________.#254 Scale in the air ejector first-stage nozzle could cause a decrease in the _______________.#255 While underway it is noticed that the main air ejector is having a hard time maintaining vacuum in the main condenser. When switching to the standby unit the vacuum returns to normal. Which of the following could be a possible cause? #256 Salt water contamination of condensate could occur at which component?