The MAWP of a boiler is 900 psi and the normal drop across the superheater is 20 psi. If the superheater safety valve is set to lift at 825 psi, the minimum settings of the drum safety valves allowed by Coast Guard Regulations would be _______.

Correct Answer: Option C — 850 psi

Per 46 CFR regulations, the superheater safety valve must lift before the drum safety valves to ensure continuous steam flow through the superheater tubing. With a 20 psi drop and a superheater valve set at 825 psi, the drum valve must be set at least 825 plus 25, equaling 850 psi.