What is the typical pressure setting of the superheater header PSV in relation to the steam drum PSV?

The typical pressure setting of the superheater header pressure safety valve (PSV) in relation to the steam drum PSV can indeed be slightly higher or lower due to the operational dynamics and safety requirements of the steam system.

Superheaters are designed to raise the temperature of steam beyond its saturation point, which often results in additional pressure within the superheater header compared to the steam drum. However, this pressure differential is not fixed, and in some systems, the superheater PSV may be set lower to provide a safety measure against overpressure conditions.

The flexibility in the pressure settings allows for adjustments based on specific system designs, operational factors, and safety margins. This is critical for ensuring that the steam system operates efficiently and safely, since incorrect pressure settings could lead to failures or hazards. Thus, the varying configuration of pressure settings depending on individual system designs leads to the nuance that the superheater header PSV could indeed be slightly higher or lower than the steam drum PSV.