Engineering Magazine

Types of water pumps are

1/Positive displacement pumps.

2/ Centrifugal pumps.

3/Hydraulic rams.

4/ Archemedies screw.

5/ Disc pumps.

Disc pumps are a series of discs (usually polypropylene, nylon or similar material) that are evenly spaced and fixed to a rope, wire or chain and run through two parallel tubes. The pick up end has an opening to allow for water pick up is submerged in the water supply and the chain of discs is powered either by an electric motor a small internal combustion engine or in some cases by hand to move the discs in a circular motion through the pipes to lift water which is then discharged through an outlet pipe located near the top of the upside pipe. These pumps are self-priming and are easily and cheaply built. They are fairly common in developing countries for that reason.