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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

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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