Hunting of Water Level in Float-Controlled Deaerators

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Abstract
Operating difficulties encountered with a deaerating feed heater during full-scale test-bed trials of a complete prototype main propulsion machinery installation are described, together with the eventual successful remedy. The water level control system of the deaerator is analysed mathematically and a criterion for stable operation established. Comparison of the theoretical and observed behaviour of the deaerator shows reasonable agreement. Practical factors affecting the validity of the theory are examined and suggestions made for improvements in design. Some remarks on common deaerator design practices are made in the light of test-bed experience. The example of this deaerator is used to illustrate an introduction to more general analytical methods. The need for these in modern steam-plant design work is explained, together with the obstacle to their use imposed by our current ignorance of the kinetic characteristics of common plant items.

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