Question 184Steam Plants - Assistant Engineer70% to pass
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 _______________.
AI Explanation
The correct answer is D) diameter of the inlet opening.
The term "nominal size" in the context of safety valves refers to the diameter of the inlet opening, which must be between 1 1/2 and 4 inches as per the regulations for propulsion boilers and superheaters. This is the critical dimension that determines the flow capacity and performance of the safety valve.
The other options are incorrect because they do not correspond to the definition of "nominal size" as it applies to safety valves. The free spring length, diameter of the feather, and diameter of the huddling chamber are not the primary factors that define the nominal size of the safety valve.
Related Questions
#182 Coast Guard Regulations #183 Coast Guard Regulations #185 Coast Guard regulations require that the relieving capacity of boiler safety valves must be checked _______________.#186 A boiler superheater safety valve is set to lift at 450 psi #187 Which of the actions listed should be carried out immediately after securing the fires in one boiler of a two boiler ship?