title: Practical Centrifugal Pumps (Practical Professional Books from Elsevier)
author: Paresh Girdhar B.Eng (MechEng)
description: An engineer's guide to the design, selection, operation and maintenance of centrifugal pumps, introducing fundamental techniques and best practice through real-world case studies.
zlib_text: 2
  Hydraulic Pumps
  2.1
  INTRODUCTION
  Hydraulics is deﬁned as the science of the conveyance of liquids through pipes.
  The pump is often used to raise water from a low level to a high level where it can
  be stored in a tank. Most of the theory applicable to hydraulic pumps has been
  derived using water as the working ﬂuid, but other liquids can also be used. In this
  chapter, we will assume that liquids are totally incompressible unless otherwise
  speciﬁed. This means that the density of liquids will be considered constant no
  matter how much pressure is applied. Unless the change in pressure in a particular
  situation is very great, this assumption will not cause a signiﬁcant error in
  calculations. Centrifugal and axial ﬂow pumps are very common hydraulic
  pumps. Both work on the principle that the energy of the liquid is increased by
  imparting kinetic energy to it as it ﬂows through the pump. This energy is
  supplied by the impeller, which is driven by an electric motor or some other drive.
  The 