MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

Chapter 2Water LiftingPrinciples2.1 Classification of MethodsIn order to provide a complete and methodical disucssion of the widevariety of water lifting devices and pumps, a classification system isnecessary. Throughout the available literature, several criteria aresuggested as methods of classification. Table 2.1 lists these criteriaand examples of each.Table 2.1 Criteria for classifying water lifters1) Basic designCriteriascrew, piston,Examplesvane, wheel2) Method of energytransmissionsteam, compressed air,mechanical3) Number of displacements4) Arrangement of components5) Orientation of axis6) Number of stages7) Casing type8) Material of construction9) Application of device10) Working principle11) Method of increasing headsingle, multiple, continuousinternal gear, outside packingvertical, horizontal, inclinesingle, double, multiplevolute, diffuser, splitbronze, steel, woodsewage, broiler-feedrotary, reciprocating, centrifugalpositive displacement, kineticThe Hydraulic Institute, as well as many other references, combine severalof these criteria into one classification arrangement--see HydraulicInstitute Standards (any edition) and Hicks and Edwards (1971).13