Abstract
Owing to the incompatibility of free surface and closed conduit scaling requirements, pump intake investigations are often carried out in two stages.
Stage 1 covers pump intake design investigations, which establish the hydraulic acceptability of the main approach works, whilst Stage 2 deals with pump and adjacent inlet investigations, which are used to study in detail flow immediately upstream of the pump and its relation with pump performance.
Correlation of Stage 1 and Stage 2 is discussed and test rig and testing requirements for the latter are described. Results of model investigations and the ensuing suction duct designs for typical large circulating water pumps are summarized. The discussion is extended to more general comments on the effect of installation on pump performance and its measurement.
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