ABSTRACT
The pump is one of the oldest devices known to mankind and is second only to the squirrel cage induction motor in numbers used. With a long history and wide usage, the pump has been subjected to sustained inventive ingenuity, resulting in its now being available in myriad types. Even with a classification chart as an aid, selection of the most appropriate pump type for a particular duty can still be a daunting task. Daunting can be illustrated by observing that for many duties the choice of pump types is quite controversial, meaning there is likely more than one appropriate selection. The hydraulic duty determined from process data is the total for the system. For pump selection the hydraulic duty has to be that per pump, the pump rating. In some instances it may be more economical to employ a “sacrificial” pump and replace it periodically rather than one whose service life will be significantly longer.
