Question 128Steam Plants - 1st Asst/Chief70% 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 B) diameter of the inlet opening.
The term "nominal size" in the context of safety valves refers to the diameter of the inlet opening, which is the critical dimension that determines the flow capacity of the valve. This requirement is specified in the regulations governing propulsion boilers and superheaters used on U.S. Coast Guard-inspected vessels.
The other options are incorrect because they do not directly correspond to the definition of "nominal size" as it applies to safety valve sizing. The free spring length, diameter of the huddling chamber, and diameter of the feather are other design parameters of the safety valve, but they are not what is meant by the "nominal size" specification.
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