Question 159Steam Plants - Assistant Engineer70% to pass
When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil _______________.
AI Explanation
The correct answer is C) back to the suction side of the service pump.
When preparing to light off a cold boiler with a return flow fuel oil system, the recirculating valve directs the flow of oil back to the suction side of the service pump. This allows the oil to be recirculated and further warmed up before being delivered to the fuel oil heater and the boiler. This ensures the proper viscosity of the fuel oil for efficient combustion.
The other options are incorrect because: A) directly feeding the fuel oil heater inlet would not allow for proper warm-up of the oil, B) recirculating to the fuel oil settler would not provide the necessary warm-up, and D) directing the oil to the deep tanks would not serve the purpose of preparing the boiler for lighting off.
Related Questions
#157 Which of the following actions should be taken FIRST when water is found in the fuel oil settling tank? #158 Which of the following would indicate a moderate leak in the desuperheater? #160 Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler? #161 Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off? #162 Which statement is true concerning two-stage air ejector assemblies?