18-08-2012, 02:53 PM
Pumps and Pumping Systems
Pumps and pumping systems.ppt (Size: 2.79 MB / Downloads: 131)
Introduction
20% of world’s electrical energy demand
25-50% of energy usage in some industries
Used for
Domestic, commercial, industrial and agricultural services
Municipal water and wastewater services
Pumping System Characteristics
Head
Resistance of the system
Two types: static and friction
Static head
Difference in height between source and destination
Independent of flow
Positive Displacement Pumps
For each pump revolution
Fixed amount of liquid taken from one end
Positively discharged at other end
If pipe blocked
Pressure rises
Can damage pump
Used for pumping fluids other than water
Dynamic pumps
Mode of operation
Rotating impeller converts kinetic energy into pressure or velocity to pump the fluid
Two types
Centrifugal pumps: pumping water in industry – 75% of pumps installed
Special effect pumps: specialized conditions