Identify the strainer shown in the figure, which is used in tube well irrigation.

Explanation:

Ashford Strainer

• It consists of a perforated tube with a wire mesh surrounding it.

• To keep the space between the mesh and the tube a wire is wound around the tube. The wire-mesh is soldered to this wire.

• The wire mesh can be protected by a wire net above all. This type is delicate because there are many loose parts.

Additional Information

Brownlie strainer

• It is made of a convoluted tube of steel. There are perforations in the tube. The wire mesh of copper surrounds the steel tube.

• This type is designed in such a way that there is some space left between the perforated tube and the surrounding wire-mesh.

 Cook strainer

• It consists of a solid drawn brass tube. The wedge shaped slots are cut on the surface of the tube. The slots are horizontal.

• The slots are cut from inside of the tube. Thus the openings are wide inside of the tube.

• The width of slot varies from 15/100 to 40/100 of a mm depending upon the coarseness of sand.

• This strainer is quite good but it is very expensive as the slot cutting is a difficult process.

• Only difference between the Tej and Cook strainer is in former the brass sheet is first slotted and then bent to form a tube.
• The tube is then brazed. As there are joints this strainer is weaker.
• It is cheap and hence widely used.