Water-Lifting Devices – Pumps - Practices of Irrigation and On-farm Water Management - page 433

Chapter 12
Water-Lifting Devices - Pumps

Contents

Classification of Water-Lifting Devices ................... 435
12.1.1 Human-Powered Devices ..................... 435
12.1.2 Animal-Powered Devices ..................... 436
12.1.3 Kinetic Energy Powered Device .................. 436
12.1.4 Mechanically Powered Water-Lifting Devices ............ 437

12.1

Definition, Purpose, and Classification of Pumps ............... 437
12.2.1

12.2

Definition of Pump ........................ 437

Pumping Purpose ......................... 437 12.2.2

Principles in Water Pumping .................... 438

12.2.3

Classification of Pumps ...................... 438 12.2.4

Factors Affecting the Practical Suction Lift of Suction-Mode Pump ...... 442 12.3

Centrifugal Pumps ............................ 442
12.4.1

12.4

Features and Principles of Centrifugal Pumps ............ 442

Some Relevant Terminologies to Centrifugal Pump ......... 443 12.4.2

Pump Efficiency ......................... 445

12.4.3

Specific Speed .......................... 446

12.4.4

Affinity Laws .......................... 446 12.4.5

Priming of Centrifugal Pumps ................... 448 12.4.6

Cavitation ............................ 449 12.4.7

Description of Different Types of Centrifugal Pumps ............. 449
12.5.1 Turbine Pump .......................... 449
12.5.2 Submersible Pump ........................ 451
12.5.3 Mono-Block Pump ........................ 454
12.5.4 Radial-Flow Pump ........................ 455
12.5.5 Volute Pump ........................... 456
12.5.6 Axial-Flow Pump ........................ 456
12.5.7 Mixed-Flow Pump ........................ 456
12.5.8

12.5

Advantage and Disadvantage of Different Centrifugal Pumps ..... 457

12.5.9 Some Common Problems of Centrifugal

Pumps, Their Probable Causes, and Remedial
Measures ............................. 457