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Superheater safety valves should be set below the safety valves on the steam drum. This configuration ensures that the safety valves on the steam drum will relieve excess pressure before the superheater safety valves can be activated. By placing the superheater safety valves below, it protects the superheater from overpressure conditions that could occur if steam pressure were to exceed safe limits within the drum.

The primary purpose of safety valves is to prevent potentially hazardous pressure buildup, maintaining operational safety in the boiler system. If the superheater safety valves were set at the same level or above the drum's safety valves, there is a risk that the superheater could experience hazardous conditions before the steam drum's safety valves function as intended. This design principle is crucial for maintaining safe operation and protecting boiler components from potential damage due to overpressure.