Internal Recirculation At reduced flow, centrifugal pumps can experience a flow reversal where the fluid turns and flows back upstream. ... This leads to cavitation, pressure pulsations and noise that can interfere with the pump's operation and damage the impeller.13 feb 2017
Which pump is used for low discharge?
Centrifugal pumps
Which pump is used for higher heads?
Centrifugal pumps Reciprocating pumps
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It is used for large discharge through smaller heads It is meant for a small discharge and high heads
The cost of a centrifugal pump is less as compared to a reciprocating pump The cost of a reciprocating pump is approximately four times the cost of a centrifugal pump
Why centrifugal pump is high discharge pump?
Centrifugal pump is a kinetic device. ... So the liquid entering the pump receives kinetic energy from the rotating impeller. The centrifugal action of the impeller accelerates the liquid to a high velocity, transferring mechanical (rotational) energy to the liquid. So it discharges the liquid in high rate.
How does pump speed affect head?
These laws state that the flow rate or capacity is directly proportional to the pump speed; the discharge head is directly proportional to the square of the pump speed; and the power required by the pump motor is directly proportional to the cube of the pump speed.
What happens to the flow if you increase the total head?
To choose your required pump, you need to know two things: the total head and what flow rate you require. ... In fact, as the flow increases, friction increases and the total head continues to decrease. The amount of head that is lost due to friction is called “friction head” or “friction-loss” (see Figure 5 and Figure 6).