Abstract
Circulation pumps are an essential feature of controlled circulation boilers. They are used to increase the available natural head so that control of quantity and distribution of flow of water through the boiler furnace walls can be obtained. Absolute reliability in service is essential. The glandless pump has been developed to such a specification. Boiler types are defined leading to the boiler design influence on pump duties and how the pump(s) fit into the boiler system. Some operating problems and their solution are discussed.
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