EVA heavy duty screens remove weeds from inlet channels
EVA heavy duty back raked screens Print E-mail

For many water and wastewater treatment installations the removal of large debris such as weeds, logs and branches poses a health and safey risk when these items have to be removed manually from screens.

 

The EVA screen is specifically designed for heavy duty screening applications:evatines

 

  • All debris is removed from the bar screen in one movement from where it is automatically discharged to a conveyor or bin.
  • The back raking tines plunge into the weed or debris mass at the base of the intake channel. They do not have to descend through the contaminated water as is the case with front-raked machines.
  • All working parts are protected behind the static grid and function on the clean side of the bar screen.

The EVA back raked screens are particularly suited to installations such as power and desalination projects, for river water intakes where weeds, leaves, logs and branches need to be removed, on sewage stations for inlet works, storm over-flow sites, or for industrial complexes where effluents have to be treated prior to discharge. evatines2


Installation


  • Machines are completely assembled in workshop and run 'dry' for a period of time to ensure all settings and adjustments are correct.
  • Dispatched to site in one piece where the final installation takes 24-48 hours.
  • The units are free-standing and require only grooves in the channel walls for positive location, fixing is only required at deck level.
  • Top section of screen protrudes as low as 1,6 m above deck level, height of curved section above deck level can be varied depending on  discharge method.
  • Machines can be removed in one piece at any time for inspection and maintenance.

Materials

 

  • Designed to suit to a broad selection of materials depending on the location and type of duty.
  • The standard machine incorporates carbon steel bars and carbon steel side channels and guides.
  • The raking tines can be of stainless steel.
  • The unit can also be manufactured entirely in stainless steel if necessary or a combination of materials.


Special features

The unique patented motion of the raking tines in relation to the bars enables this machine to overcome all standard objections that could possibly apply to back-raked machines :

The unique patented motion of the raking tines allows considerable tine penetration. The basic machine utilises two raking bars. As one is discharging the other is plunging into the contaminated water at the foot of the intake.

On deep sumps, or where weed loading is particularly difficult, four raking tines can be applied or in exceptional circumstances six or even eight. It is very easy to attach another set of raking bars at any time during the station's life. Therefore, complete flexibility is maintained regarding rate of discharge and speed of raking.

Further info:

 

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Last Updated ( Wednesday, 02 June 2010 02:02 )