ISA-TR77.42.02-2009 , Fossil Fuel Power Plant Compensated Differential Pressure Based Drum Level Measurement

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This Technical Report supplements ANSI/ISA-77.42.01, Fossil Fuel Plant Feedwater Control System-Drum Type, and provides recommendations for level measurement in boiler steam drums. Specifically, the use of differential pressure transmitters for drum level measurement in a power plant boiler drum is described. The need for compensation for density changes is explained and equations for the proper compensation are derived.