Factors influencing the longitudinal variation of water level in the drums of circulating boilers are discussed with reference to the results of cold-circulation trials performed on a 500 MW assisted-circulation boiler. Numerical computation and small-scale model tests in support of the field trials are also presented. This information, together with evidence from further work on the operating boiler, has shown that small cold-water models provide an accurate analogue of drum operation at working pressures and temperatures.
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