Great White Center
Flow Screen

Independently certified to have one of
the highest screening capture ratios on
the market.

Independently certified to have one of the highest screening capture ratios on the market.

At-A-Glance

Type
  • High capacity, continuous band fine screen with low headloss and zero carryover
Screenings Capture Ratio
  • Highest SCR of 45 screens independently evaluated
  • 93.25% with 2mm grid
  • 84% with 6mm grid
Models
  • Center Flow (center entrance/side exit)
  • Dual Flow (side entrance/rear exit)
Grid Opening Range
  • A0.5mm to 25mm
Flow Capacity
  • 0.1mgd (5 L/s) to 125+mgd (5,500+ L/s)
Grid Types
  • Stainless steel laced link
  • Stainless steel wire mesh
  • Stainless steel perforated panel
  • UHMWPE perforated panel
Stainless Steel
  • T304
  • T316
  • Super Duplex
  • High nickel stainless steels

Overview

The Great White Shark is an apex predator and rules almost every body of water around the world. Like the shark from which it bears its name, our Great White screen is designed and manufactured at the pinnacle of quality and dominates the competition.

 

Our Great White screens have been independently certified to have the highest screening capture ratio of all band screens on the market. Dual spray wash, patented grid design, proprietary sealing system and UHMWPE Guide Links make this an exceptional product for the filtering and offloading of water and wastewater screenings.

 

Very low headlosses and extremely strong, reinforced grids make these center and dual flow screens suitable for a number of applications. The patented sealing system ensures all tolerances are held to 0.5mm – even those that other screens leave vulnerable. The Great White Center Flow Screen is designed to handle low-to-high flows with 0.5-25mm openings and can be incorporated into our Septage Receiving Station.

  • High screening capture for unsurpassed protection of downstream processes
  • Numerous proprietary design features easily collect and offload screenings, including rags and stringy material
  • Center Flow (center entrance/side exit) and Dual Flow (side entrance/rear exit) options

Features & Benefits

Rollover each feature to interact.
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Applications

Very low headlosses and extremely strong, well-reinforced grids make these center flow (center entrance, side exit) and dual flow (side entrance, rear exit) screens suitable for a number of applications.

Municipal Water

  • Comminutor and grinder replacement
  • Final Effluent Polishing
  • Membrane and Membrane Bioreactor (MBR) Protection
  • Package Plant Primary Treatment
  • Pump and Lift Stations
  • Sludge and Septage Receiving
  • Sludge Screening and Thickening
  • Treatment Plant Headworks and Intake

Municipal Water

  • Algae Removal
  • Desalination Plant/RO Protection
  • Membrane and Membrane Bioreactor (MBR) Protection
  • Raw Water Intake

Industrial Wastewater

  • Chemical Processing
  • Food & Beverage
  • Manufacturing
  • Meat and Poultry Processing
  • Membrane and Membrane Bioreactor (MBR) Protection
  • Mining
  • Petroleum
  • Pulp and Paper
  • Textile Mills

Industrial Process

  • Cooling Tower Scale Removal
  • Cooling Water Intake – Power Generation
  • Fish Farming
  • Irrigation System Protection
  • Membrane Bioreactor Protection
  • Petroleum Refinery
  • Raw Water Intake – Potable Water
  • Uranium Refinery

Screen Grid Options

We offer opening options that include stainless steel links, wire mesh and perforated panels as well as UHMWPE perforated panels. Our Great White screens can accommodate flows from 0.1mgd (5 L/s) to 125+mgd (5,500+ L/s) and opening sizes 0.5mm to 25mm.

Theory of Operation

Flow passes into the screen and is diverted through the grid on each side of the unit. The Center Flow design directs water into the screen and exits out the sides while the Dual Flow design directs water from outside of the equipment through the sides for a rear exit.

 

Solids larger than the openings in the screen’s grid are collected and begin to form a mat which is removed undisturbed from the flow resulting in extremely high solids capture. Screening capture ratios increase as the solids form a thicker mat. Level sensing devices can be connected to variable speed drives to automatically compensate for high solids loading during peak flows or low flow conditions by proportionally speeding or slowing the grid travel speed. This increases the capacity of the equipment when needed and reduces wear, thereby extending the life of the equipment.

Solids are transported to the top of the screen as flow is constantly presented a clean grid surface. As screenings traverse up and over the top of the screen they are discharged into screening handling equipment. Drained wash water is discharged upstream – eliminating bypass.

Minimal friction is achieved through the use of Ultra High Molecular Weight Poly Ethylene (UHMWPE) and stainless steel wear surfaces. Machined Delrin spacers precisely separate elements, eliminating metal-on-metal wear and extending the life of the grid. Wide stainless steel tracks ensure years of trouble-free operation.

The stainless steel foot section and wear tracks prevent solids bypass. Unlike traditional screens, all solids with diameters larger than screen opening sizes cannot pass under, through or over the screen. Even in the event debris is not unloaded by spray wash, it always remains on the “dirty” side of the screen.

Sealing

Our patented sealing system holds extremely tight tolerances between panels and grid to frame, eliminating the bypass of solids and intrusion of abrasive grit. We can ensure a tight tolerance down to 0.5mm in all locations of the screen, even those areas that other screens leave vulnerable.

 

The value of this design was tested by an independent national testing facility and was awarded the highest Screening Capture Ratio (SCR) of any bandscreen. Our 6mm screen received an SCR rating of 84% while our 2mm received an SCR rating of 93.25%.

Grid-to-Frame

  • Guide Links create a continuous chain around edge of selected grid
  • Formed stainless steel plate creates a labyrinth seal with Guide Link slot
  • Fully adjustable and removable for inspection
  • Continuously sealed for entire submerged grid path

Panel-to-Panel

  • Slotted stainless steel hook links separated by Delrin spacers
  • Links support panels every 3” (75mm)
  • Panels are closely held against spacers
  • No neoprene to erode or fall off
  • No hinge to loosen or stretch
  • Simple in-situ replacement

Drive

Patented direct drives efficiently power the screen. Stainless steel sprockets support and pull the black UHMWPE Guide Links, resulting in little-to-no friction and long wear. Most importantly, no part of the drive touches the grid. Therefore, a bent grid element will not be compounded into a disabled screen.

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Electric Drive

Resilience to weather, wear, and lack of maintenance make this model an excellent choice for virtually every installation. Through sensible design and material selection this headworks screen is very efficient, utilizing a 0.5 hp (0.38 kW) electric motor. Screens will be wired to suit applications phase and voltage supplies. Chain guards are standard on all electrical models. Explosion proof motors are optional.
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sprocket

Hydraulic Drive

The Great White screen with hydraulic drive incorporates all the benefits of the electric drive with the added capability to be operated submerged. This is a useful option when flooding can occur and reliability is key.

Features

  • Solid stainless steel sprockets and drive shaft
  • Lifts and supports grid
  • Minimum four lugs engaged per sprocket
  • Adjusts to tension grid to extend wear life of screen
  • Grid does not touch drive or unloading mechanism
  • Low friction guide links
  • Fractional hp and kW requirements
  • Only two grease fittings per screen
  • Direct drive uses no chains or sprockets

Screenings Discharge

Several discharge options are available depending on disposal requirements.

Spray Wash

 

Our highly effective spray wash is a superior method of cleaning the grid and prohibiting carry-over. Spray nozzles efficiently direct pressurized water over the width of the grid to positively remove all screenings and prevent carry-over. This method of discharge requires a relatively clean source of water to avoid clogging.

Deluge Wash

 

Low pressure deluge wash is a good alternative to spray headers if a source of clean water is not available. The deluge washer allows plant effluent or even screened flow to be used. This system also acts as a supply for screenings handling equipment.

Screenings Handling

An effective screenings handling system is a critical component to every water or wastewater treatment plant. Hydro-Dyne’s turn-key screenings handling solutions are manufactured at the highest level of quality and designed to accept, wash, dewater, compact and/or transport collected screenings. In wastewater applications, screening handling systems are particularly important as they are designed to return organic material to the channel and produce clean, dry and inorganic product that can be properly disposed of in either a container or bagging unit.

Screening Handling At-A-Glance

  • Collect and convey screenings for disposal
  • Returns organics and wash water to channel
  • Screenings meet strict landfill requirements
  • Compactors reduce disposal weight and volume
  • Bagging units can contain odor
  • Agitation can be introduced for more thorough cleaning
  • Can be designed as integral and external models
  • Shafted and shaftless screw flights

Whitetip Shark Washing Compactor

  • Collects, conveys and compacts screenings for disposal
  • Dewatering and conditioning
  • Returns most organics and wash water to channel

Thresher Shark Washing Machine

  • Extremely thorough washing removes virtually all fecal material and produces “clean” and compacted screenings for disposal
  • High capture of inorganic solids reduces plant operating costs and improves sludge quality
  • Organic material returned to plant for biologic treatment

Spinner Shark Screw Conveyor

  • Collects and conveys screenings for disposal

Options

  • Center Flow and Dual Flow models
  • Stainless steel laced links, wire mesh and perforated panel or UHMWPE perforated panel grid openings
  • Optional Proprietary Bypass Gate eliminates need for additional channel and is available in manual or fully automated operation
  • T304, T316 and specialty stainless steel construction
  • Controls are offered from basic operation to sophisticated automation
  • Cold weather/freeze protection
  • Septage Receiving Station
  • Sectional screens for field assembly in confined spaces
  • Sluice or integral compactor discharge arrangements

Thank you for your
interest in our company.

Do you have any questions or would you like more information? We’d
be happy to hear from you.

Do you have any questions or would you like more information? We’d be happy to hear from you.

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