• The strainer pipe is a perforate pipe which is provid with such an arrangement that only water can be admitted inside the pipe.
  • Various patents types of strainers are available in the market.

Some of the strainer are:

1. Cook’s strainer

2. Tej strainer

3. Ashford strainer

4. Leggett strainer

5. Phoenix strainer

6. Layne and Bowler strainer

7. Brownlie strainer

8. Esbee strainer

9. Mesh strainer.

1. Cook’s Strainer.

  • It is made from solid drawn brass tube and is very costly.
  • It consists of wedge shaped slots atits surface.
  • Slots are wider at the inside and finer at the outer surface.
  • The size of the slots depends upon the coarseness of the sand in which it is to be used.
  • It is not used much in India.
  • The size of the slots may vary from 0.1 mm to 0.4 mm.

Cook strainer

2. Tej Strainer.

  • It is just like Cook’s strainer.
  • The strainer tube is made by folding and bending the brass sheet.
  • Slots are cuts in the sheet in required gauge before sheet is bent to form a tube.
  • It is very much manufactured in India.
  • Its diameter is 7.5 cm and above and length 2.5 m.
  • Vertical joint of the sheet is closed by brazing.
  • If larger than 2.5 in length is required more than one lengths of strainer are joined together by screwed collar joint.

3. Ashford Strainer.

  • It is also a brass tube having round holes in it.
  • A steel wire is wrapped over the brass tube and then a wire mesh is soldered to the wound wire.
  • The wire is wound to maintain a clear space between strainer and wire mesh.
  • The wire mesh is finally protected and strengthened by a wire net around it.

4. Leggett Strainer.

  • It is a very costly strainer.
  • It is not used in India.
  • The device can be operated from the ground. Whenever strainer is clogged this device is operated and strainer is cleaned without any difficulty.

5. Phoenix Strainer.

  • It consists of a cadmium plated mild steel tube.
  • Cadmium plating keeps the strainer free from choking and corrosion.
  • Its slots are also made from inside the tube with the help of a special machine.

6. Layne and Bowler Strainer.

  • It also consists of a slotted or perforated steel or wrought iron pipe.
  • A wedge shaped steel wire is wound around the tube at suitable pitch.

7. Brownlie Strainer.

  • Steel plates are bent in form of polygonal convolutes.
  • Suitable perforation holes are made in convolutes.
  • The convolute shaped perforated tube is enclosed in a wire mesh of copper wires.
  • It is considered one of the best strainers as wire mesh remains slightly away from the perforated tube.



(a) Brownlie strainer (b) Ashford strainer.



8. Esbee Strainer.

  • It consists of a steel frame made of iron rods and wound by coir.
  • The coir acts as a screen which allows water to pass but prevents sand.
  • Its ends are so rivetted to screwed pipe that they can be easily joined to the next pipe.

9. Mesh Strainer.

  • It consists of a metal plate in which slots are punched.
  • The punched strip is not removed.
  • It is mostly made from iron plate which is wound in form of a pipe after making slots in it. It is claimed that they do not choke.