Question 186Steam Plants - Assistant Engineer70% to pass
A boiler superheater safety valve is set to lift at 450 psi
AI Explanation
The correct answer is A) 46 CFR require that if there is a pressure drop of 10 psi, the superheater safety valve set at 450 psi must open to relieve the pressure.
According to the Code of Federal Regulations (CFR) for the US Coast Guard, specifically 46 CFR, the regulations state that a superheater safety valve must be set to lift at a pressure no higher than 103% of the maximum allowable working pressure of the superheater. In this case, with a set pressure of 450 psi, a 10 psi drop would be within the 103% limit, causing the valve to open and relieve the pressure as required by the regulations.
The other options are incorrect because B) is not a complete answer, C) is the metric equivalent of the set pressure rather than the regulatory requirement, and D) is higher than the 103% limit specified in the regulations.
Related Questions
#184 The safety valve nominal size for propulsion boilers and superheaters must be not less than 1 1/2 inches and not more than 4 inches. The term 'nominal size' refers to the _______________.#185 Coast Guard regulations require that the relieving capacity of boiler safety valves must be checked _______________.#187 Which of the actions listed should be carried out immediately after securing the fires in one boiler of a two boiler ship? #188 Which of the valves listed should be closed before lighting off a boiler? #189 Which of the following statements about boilers is correct?