PARABOLIC SCREENS | RUN DOWN SCREENS | SIDEHILL SCREENS

Screen System’s range of parabolic screens, also known as run down screens and sidehill screens, offer many benefits. The benefits include a high capacity, cost effective, highly efficient method of solids/liquids separation. They use stainless steel wedge wire as the screening medium. 0.010″ = 0.25 mm to 0.125″ = 3.12 mm

Parabolic Screens – Design

Each run down screen unit is designed to suit the requirements of the customer as well as the application, enabling a relatively low cost solution for separating solids and also liquids. Consisting of a basic outer casing, which is manufactured in mild steel or stainless steel. Each unit incorporates a distribution chamber and feed weir, over which the effluent passes onto the wedge wire panel, set at right angles to the material flow, enabling the separating process to commence. Separated solids collect on the lower half of the screen to drain and compact. After that, they then slide by gravity onto a solids discharge chute. Then, the extracted liquid passes through the wedge wire into an underflow collecting chamber, with a disposal outlet for either re-circulation or discharge.

Parabolic Screens

Run down screens

EFFICIENCY

Being free standing, having no moving parts and being virtually maintenance free the run down screens/parabolic screens. Above all, with their easily reversible three stage screen panels for longer screen life offer increased dewatering efficiencies over other similar curved screening elements.

TECHNICAL DATA

Parabolic screens are designed and manufactured in a combination of four standard unit heights, with widths ranging from 500mm to 3,000mm. In conclusion this is dependant on the application and capacities required to be screened. furthermore, high capacities utilise purpose designed multiple units. A test unit is available for field trials at the customers site. For further information please contact the sales office.

SIDEHILL SCREENS – FEATURES

  • 304 stainless steel construction
  • Housing in 3 mm thick plate

OPTIONS

  • 316 stainless steel or 304 construction
  • Range of wedge wire shapes and designs, Coanda (straight, looped, waved) to match applications.
  • Vapour enclosure if required.
  • Front or rear spray bars.
  • Swivel screens for ease of cleaning.

MODELS

  • SHB – Single housing containing multiple decks
  • SHL – 54″ long extended screen deck
  • SHS – 42″ long standard screen deck
  • SHM 38″ or shorter, mini screen deck

Run Down Screens

The smaller run down screens are built to swivel for easy cleaning.

Run Down Screens

CAPACITIES

The following table offers as a guide a range of capacities for the run down screens based on capacities per metre width.

850 SX 1000 SX 1800 SX 2000 SX
APERTURE
mm
CAPACITY
M3/Hr/M
CAPACITY
M3/Hr/M
CAPACITY
M3/Hr/M
CAPACITY
M3/Hr/M
0.25 5.00 9.00 11.00 14.00
0.50 9.00 16.00 22.00 28.00
0.75 21.00 35.00 37.00 47.00
1.00 28.00 47.00 56.00 70.00
1.50 42.00 70.00 94.00 117.00
2.00 56.00 94.00 113.00 141.00
3.00 70.00 117.00 150.00 184.00

1 Cubic metre = 220 gallons (approx).

1 Gallon = 0.00454 cubic metres (approx).

Applications Wedgewire screen slot sizes (mm)
Municipal – Primary sewage 1.5/2.5
Poultry – Feather 1.5
Meat – Stock water / pen wash down 0.5/1.0
Fruit and vegetables 0.25/0.50
Brewery – Spent grains / bottle wash 0.75/1.0
Mineral – Coal wash / lime particulate 0.5/0.75
Forestry – White water / chip wash water / pulp thickening / rejects 0.4/0.5/0.75/1.0

Screen Systems slot sizes can go up to 1.5 mm.

TYPICAL APPLICATIONS FOR RUN DOWN SCREENS

  • Mineral processing
  • Textile finishing
  • Abattoirs
  • Tanneries
  • Agricultural
  • Poultry
  • Vegetable processing

Data sheets are available for our Screentex Product Range including

  • Run Down Screens/Side hill screens
  • Upward flow wedge wire clarifier
  • Upward flow clarifiers

Contact us for more details

CASE STUDY – RUNDOWN UNIT FOR CIDER WORKS

Screen Systems have recently completed a project for a rundown unit for a traditional cider works. The rundown screen is used to remove apple solids and leaves from the water before it is discharged. The unit was complete with swivel screen and tri-clamps. The customer upgraded from perforated panels to wedge wire screens on his brush screen.

Made using stainless steel 304 throughout, 1200mm high x 1000mm wide, 1.0mm aperture x 28SB wire, to be used for dewatering.

CASE STUDY – RUN DOWN SCREENS FOR MUNICIPAL WORKS

Screen Systems have recently completed a project for 3 run down screens / parabolic screens. The screen is pivoted in the middle, this allows the screen to swing 180 degrees from its working position this allows easy cleaning at the back of the screen and inside the unit without the need for heavy lifting equipment to remove the screen, the three units are going into a municipal works.