Drum level controller system for safety of boiler and controlling feed water level help providing a constant supply of steam controlling to maintain water level constant by feed water flow also in relationship to steam flow.
If water level is too high, flooding of steam purification/carry over equipment can be occurred.
If level is too low, reduction in efficiency of treatment and recirculation function, pressure can also build to dangerous level/dangerous to boiler pressure parts etc.
Drum internal primary and secondary for boiler to separate water/steam and dry steam to outlet.