What is a Pump ?
A Pump is a mechanical device used to transfer liquids from one point to other by imparting energy supplied by a prime mover to the liquid.
Types of Pumps
Pump types generally fall into two main categories - Dynamic (Centrifugal) pump
- Positive Displacement pump
PUMP CHARACTERISTIC
PUMP EFFICIENCY
Unstable & Drooping
Shutoff Head
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgTrBe7XKRxtRXsVzk2uG-m4QAQHqtjH3iQjSu2EA64ZETfbD0RhdTi3tJgHp7ujkcysgWoBEUTdhxUAG1g5TlDq4yvPxH6G4DXWMifm7XEIt65u9GQN2XPWXlSSg9t6s1j1I990QCv3qs/w640-h258/Unstable+%2526+Drooping.jpg)
The shut-off head of a pump is at where the flow rate in a vertical pipe connected
to the operating pump becomes zero.
Series & Parallel Operation
Affinity Laws
Q1/Q2 = (N1/N2) or (D1/D2)
H1/H2 = (N1/N2)2 or (D1/D2)2
P1/P2 = (N1/N2)3 or (D1/D2)3
Q = Flow, N = shaft speed RPM, D = Impeller diameter, H = head, P = power
Head & Pressure Relationship
Priming
Cavitation
Net Positive Suction Head (NPSHA, NPSHR)
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