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Engine_2014 : Steam Plants - 919/1951
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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 __________.
A) free spring length
B) diameter of the feather
C) diameter of the inlet opening
D) diameter of the huddling chamber
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