SC Boiler Installation Practice Questions - South Carolina Boiler Installation Contractor Examination Exam

Why are superheater safety valves customarily set to open at a slightly lower pressure than the drum safety valves?

To raise drum water level during a high-pressure trip To convert the boiler to Section IV service To keep the economizer flooded To guarantee steam flow through the superheater tubes when the valves lift, so the tubes are steam-cooled

Correct Answer:

To guarantee steam flow through the superheater tubes when the valves lift, so the tubes are steam-cooled

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