by INTRODUCTION
Pumps are machines designed to move liquids and add energy.
An operating pump changes the mechanical energy available from
motor into potential, kinetic and thermal energy imported to liquid flow.
All pumps may be divided in two major categories:
(1) dynamic, “Centrifugal pumps” in which energy is continuously added
to increase the fluid velocities within the machine to values in excess
of those occuring at the discharge such that subsequent velocity
reduction within or beyond the pump produces a pressure increase.
(2) displacement, “positive displacement pumps” in which energy is periodically added by application of force to one or more movable boundaries of any desired number of enclosed, fluid containing volumes, resulting in a direct increase in pressure up to the value required to move the fluid through valves
or port into the discharge line.
Pumps are machines designed to move liquids and add energy.
An operating pump changes the mechanical energy available from
motor into potential, kinetic and thermal energy imported to liquid flow.
All pumps may be divided in two major categories:
(1) dynamic, “Centrifugal pumps” in which energy is continuously added
to increase the fluid velocities within the machine to values in excess
of those occuring at the discharge such that subsequent velocity
reduction within or beyond the pump produces a pressure increase.
(2) displacement, “positive displacement pumps” in which energy is periodically added by application of force to one or more movable boundaries of any desired number of enclosed, fluid containing volumes, resulting in a direct increase in pressure up to the value required to move the fluid through valves
or port into the discharge line.
