Brackett Green® CF200® Band Screen

Brackett Green® CF200® band screens offer the highest screening efficiency due to our patented technology, which eliminates hair pinning. The central flow pattern is most effective in removing suspended solids from wastewater and removes the problem of "carryover" found in other types of screens. Screenings are retained on the inside of the panels and are discharged by low pressure water jets. Our advanced design makes Brackett Green® band screens an ideal solution for any screening application.
  • High performance two-dimensional screening
  • High debris carrying capacity
  • Proprietary contact seals ensure nothing larger than the mesh aperture size bypasses the screen
  • Patented mesh panels eliminate the need for brush gear
  • Supplied as a free-standing single unit for ease of installation
  • Anti-static components available on request
  • Split band rollers (available after initial installation) reduce maintenance costs and downtime

Ovivo’s proprietary sizing technology and program software ensure proper sizing of the CF200® screens for the control of critical entrance, screen and exit flow velocities, while maintaining acceptable headloss and plant hydraulics. With apertures ranging from 2.0mm-6.0mm and capture ratios from 80%-97%, the CF200 provides one of the highest screenings capture rates in the industry today. All screens are high quality, stainless steel, rigid frame constructions with anti-friction bearings and low pressure jet cleaning, which prevent blinding and the need for brushing or manual cleaning.

  • Increased capture ratios increase plant efficiency by reducing maintenance costs and downtime
  • Pre-packaged units reduce equipment cost and installation time
  • Robust design and corrosion resistant materials extend machine life, providing decades of service
  • Fully automatic operation requiring minimal operator attention reduces running costs and reduced plant power consumption
  • Single motor design reduces running, ancillary and electrical costs

The patented mesh panels eliminate hair pinning or stapling of hair and fibrous solids. They incorporate tapered holes that minimize potential plugging from wedged debris and kitchen grease. Screen panels of steel or other metallic mesh increase the risk of hair pinning. They require brush cleaners, greater wash water pressures, water volume and increased service and maintenance.

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Individually tailored for each installation, the Brackett Green® CF200® band screens regularly replace straight-through screens, step screens, raking screens and other less efficient screens on inlet works, outfall sites and storm installations.

 

 

 

 

The screens are sized based on key design information:

• Flow rate per screen
• Screen channel depth
• Screen channel width
• Maximum upstream or downstream fixed water level
• Screen panel aperture size required (2mm, 3mm or 5mm diameter)
• Discharge height above deck level

 

The Brackett Green® CF200® band screen was introduced in 1991 and is the largest model CF screen available. It is capable of treating flows up to a maximum of 5,500 l/sec, requiring a minimum channel depth of 0.70mm up to a maximum of 9.70mm with a maximum immersion level of 5.00 meters. Our standard designs offer front opening and screening panel widths available in 500mm, 1,000mm or 1,500mm dimensions. Inlet channel and screen chamber widths are governed by the size of the screen selected. Matching machine size to the channel width is essential for reducing the headloss and velocity through the screen to acceptable levels.

Our CF band screens utilize a center flow pattern – where water enters the center of the screen, then flows outwards through the two sides of the moving band of patented screen panels that run parallel to the flow before discharging it to the outside of the screen and sending it downstream. Research and testing have proven that the center flow pattern is the most efficient engineering design today, effectively reducing, eliminating and controlling both carryover and bypassing of screenings at the inlet works of a sewage treatment plant.

 

  • The screen frame is manufactured in one piece for ease of installation, enabling the machine to be lifted into position on-site, in the fully assembled condition.
  • The head section of the frame incorporates a headshaft equipped with two sprockets that transmit drive to the band. The headshaft is supported at each end by self-aligning split roller bearings sealed in grease-packed, waterproof housings that are retained in parallel slides, and will be supported by jacking screws.
  • The screens have an endless band of screening panels contained within a vertical self-supporting frame. The water being screened will pass through an opening in the front of the screen to the inside, then moving through the panels to the outside of the screen. As the band rotates, the debris collected on the inside is lifted above deck level where it is washed off into the debris hopper.
  • The interchangeable screen panels are attached to fabricated support frames bolted at each side to the inner links of the water-lubricated mainchains. These chain links incorporate sealing fins that are connected by pins and bushes, and fitted with rollers that run on the replaceable tracks on the frame. A debris elevator is attached to the trailing edge. Sealing between the band and frame is by means of a flexible seal attached to the screen frame, running in contact with the sealing fins on the band. A sealing strip is placed between adjacent panels. The channel partition in front of the screen will be attached to the channel walls and the screen framework, where a static seal will be utilized.
  • The screen panels are washed as they pass the discharge point above the debris trough, by a series of jets mounted on a jet pipe inside the screen head. The jets are attached to the jet pipe by quick release connections for ease of cleaning. The jet pipe has a removable end cap for flushing purposes, a pressure gauge and a pressure switch to signal an alarm should washwater not be available. A tapping from the jet pipe supplies water to a flushing jet in the hopper.
  • A flushing pipe assembly is provided in the hopper to aid in screenings removal. A flushing pipe is used in conjunction with the screen jet pipe and is operated manually with a diaphragm valve. The head section has removable access panels and a splashguard designed to keep aerosol from the spray jets at a minimum.
  • A shaft-mounted gear unit is directly keyed to the head shaft, coupled with a flange-mounted electric motor that drives the screen. The motor comes with an anti-condensation heater.

 

Screen Type: CF200/500
Effective Screening Widths: 500mm/750mm/1000mm
Inlet Opening Width: 500mm
Design Differential: 1.00m Operating, 1.50m Static
Screen Panel Opening Diameter: 2mm/3mm/5mm/6mm/10mm
Washwater Quality Required: Pre-screened to 0.50mm
Washwater Pressure at Jetpipe: 2.0 bar
Screen Nominal Speed: 8.00m/min

Screen Type: CF200/1000
Effective Screening Widths: 1000mm/1500mm/2000mm
Inlet Opening Width: 1000mm
Design Differential: 1.00m Operating, 1.50m Static
Screen Panel Opening Diameter: 2mm/3mm/5mm/6mm/10mm
Washwater Quality Required: Pre-screened to 0.50mm
Washwater Pressure at Jetpipe: 2.0 bar
Screen Low Speed: 5.00m/min
Screen High Speed: 10.00m/min

Screen Type: CF200/1500
Effective Screening Widths: 1500mm/2000mm/2500mm/3000mm
Inlet Opening Width: 1500mm
Design Differential: 1.00m Operating, 1.50m Static
Screen Panel Opening Diameter: 2mm/3mm/5mm/6mm/10mm
Washwater Quality Required: Pre-screened to 0.50mm
Washwater Pressure at Jetpipe: 2.0 bar
Screen Low Speed: 5.00m/min
Screen High Speed: 10.00m/min

Materials of Construction
Frame and Main Materials: Stainless Steel Grade 304/316
Headshaft: Carbon Steel BS.970 Grade 080M40
Bearing Housings: Cast Iron BS.1452 Grade 220
Mainchain Sprockets: Cast Iron BS.2789 Grade 420/12
Mainchain Tension Screws/Nuts: Stainless Steel Grade 316 S31/Bronze
Mainchain Links: Stainless Steel Grade 304/316
Mainchain Pins: Stainless Steel Grade 304/316
Mainchain Bushes: Stainless Steel Grade 304/316
Mainchain Ties/Nuts: Stainless Steel Grade 304/316
Mainchain Rollers: Acetal Black
Mainchain Sealing Fins: HMWP Plastic
Chain Seal: Neoprene
Screen Panel Construction: UHMW-PE 1000 Black (Antistatic)
Screen Panel Support Sealing Strips: Neoprene
Jetpipe: Stainless Steel Grade 304/316
Washwater Jets: Polypropylene
Fixings: Stainless Steel Grade A4

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