Question 136Steam Plants - 1st Asst/Chief
70% to passA boiler superheater safety valve is set to lift at 450 psi
A46 CFR) require that if there is a pressure drop of 10 psi
BA
C3102 kPa)
D455 psi
AI Explanation
The correct answer is A. 46 CFR (Code of Federal Regulations) requires that if there is a pressure drop of 10 psi in the superheater safety valve setting, the valve must be reset. In this case, with the superheater safety valve set to lift at 450 psi, a 10 psi pressure drop would require the valve to be reset to 440 psi. The other options are incorrect because B is simply the letter A, C is a conversion to kPa which is not the relevant unit, and D is a higher pressure setting than the original 450 psi.
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