How much of the total steam produced by a boiler is relieved by a superheater safety valve?

The proper amount of steam relief from a superheater safety valve is typically around 20% of the total steam output. This safety measure is crucial because the superheater operates at elevated temperatures and pressures; therefore, it is vital to ensure that if the pressure rises above safe operating limits, there is an effective means of venting excess steam to maintain safety and prevent potential damage or failure of the boiler system. This specific percentage is established based on engineering practices and safety regulations that ensure optimal functioning and reliability within the operational parameters of the boiler system. The remaining options do not align with standard industry practices and safety guidelines, as they suggest either an inadequate or excessive relief percentage that could compromise safety.