DrumPAK Boiler Drum Level Controller

DrumPAK is a pre-engineered control package designed to provide significant improvements in maintaining drum water level, stabilizing the effects of feedwater pressure changes, and responding to plant load changes. Preconfigured templates allow selection of single-, two- or three-element control and entry of user parameters such as engineering unit ranges, tuning constants, and alarm limits from the front panel. 

Single-Element Control: The DrumPAK controller receives the Drum Level signal from the drum level transmitter, compares it to a pre-determined setpoint, and adjusts the output to the feedwater flow valve. A single-element system, while simple and low-cost, does not protect against “shrink” and “swell”, and cannot anticipate large or sudden changes in plant steam demand. Therefore this strategy is typically used on small boilers with slow load changes.