🔍 Key Concepts

• 46 CFR boiler and superheater safety valve requirements for capacity and setting • Difference between drum (main boiler) safety valves and superheater safety valves • Why safety valves might need to be set and adjusted under actual pressure rather than relying on pilot pressure

💭 Think About

• Ask yourself: which component (drum vs superheater) is required to have a total rated capacity at least equal to the maximum generating capacity of the boiler? • Consider whether all safety valves, including superheater valves, must be set and adjusted under pressure, or if that language applies to a specific type or arrangement of valve. • Think about the practical purpose of a superheater safety valve: is its primary job to provide full relieving capacity, or mainly to protect the superheater from overpressure and overheating?

✅ Before You Answer

• Verify in 46 CFR which safety valves are tied to the "total rated capacity not less than the maximum generating capacity" requirement. • Check whether superheater safety valves have a specific rule about being set and adjusted under pressure regardless of pilot pressure source. • Be sure you separate what applies to the drum safety valves versus what applies specifically to the superheater safety valves before choosing among A–D.