Guide to Boiler Drum Level Equipment and Control Concepts

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Guide to Boiler Drum Level Equipment and Control Concepts



Direct reading indicators
Gage Glasses
Gage (try) Cocks
Indirect / Remote indicators
Water Column Alarm Systems
Float Switches
Electronic Probe Level Sensors
Magnetic Level Indicators
Differential Pressure Transmitters
Indication, Alarm and Trip Combinations
Level Control
Index to Attachments
Sample Specifications
Typical Designs


“The engineer must be ever vigilant to insure the integrity of the equipment and designs he
employs when dealing with critical process applications”. This caution was given by the promoter of
a new program for testing control systems. Since there was no “Cookbook” of designs for critical
processes any design could now be “modeled” to determine its performance by this new analysis
program. For new processes or equipment this may be needed and should prove quite beneficial.
However, some processes have been studied quite thoroughly and necessary control
requirements are already well defined. Hundreds of thousands of boilers have been placed in service
and the elements needed for proper drum level measurement are well understood. Years of experience
have gone into determining satisfactory designs. Unfortunately, a failure to compile and distribute this
information has resulted in many engineers going “back to the drawing board” for every new project. Isn’t
this wealth of experience available somewhere?
New products and methods are being constantly introduced. But how do these new products
combine with existing equipment? Are there regulations which these new methods must meet? Is this
really a new product, or a research experiment?
The following guide is intended to help in the engineering effort. A sampling of “Tried and true”
designs enhanced with the latest developments in equipment and methodology are presented. Hopefully
it will provide safer operation of the boiler, save time for the design engineer, and simplify the selection of
components that are required to efficiently and safely monitor and control the boiler drum level .