Question 128Steam Plants - 1st Asst/Chief

70% 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 _______________.

Afree spring length
Bdiameter of the inlet opening
Cdiameter of the huddling chamber
Ddiameter of the feather
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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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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