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WEED SCREEN:

This weed screen constitutes a major component of our chain-type fixed weed screen cleaning systems installed at open-source water intakes of some irrigation pumping stations in Egypt. It provides primary screening of weeds and debris available in open water sources prior to supply to pumping stations. To facilitate transfer, installation and maintenance, the weed screen is made of panels. Each panel consists of 7 to 10 strips welded together leaving a 50 mm inter-distance. With a width of 100 mm, the strip thickness varies from 12 mm to 20 mm. The strip length exceeds the water intake depth by a value ranging from 50 cm to 100 cm to allow for fixation of its upper end in the chassis lower transverse beam. The strip lower end is fixed in a pocket placed at the intake bottom. Panels are mounted one after another at an angle of 75° to the horizontal. Transverse beams are distributed behind panels to prevent dislocation or change of inclination due to water pressure. Continuous or repetitive operation of pumping stations results in accumulation of weeds and debris on rack bars. Trash raking then takes place as rakes move along the screen from bottom to top.