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- Third Assistant Engineer (Steam-Motor-Gas Turbine Plants (Unlimited)) »
- Q537 - Steam Plants I
153. A boiler superheater safety valve is set to lift at 450 psi (3102 kPa). Coast Guard Regulations (46 CFR) require that if there is a pressure drop of 10 psi (69 kPa) across the superheater, the drum safety valve should set to lift at a pressure of __________.
The drum safety valve setting must account for the superheater safety setting, the pressure drop across the superheater, and a 5 psi margin to ensure the superheater safety valve lifts first, resulting in a setting of 465 psi.
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