Bull Shark Through Flow Screen
Extremely reliable and versatile screen
series that accommodates a wide range
of municipal, industrial, institutional,
and intake flows.
Extremely reliable and versatile screen series that accommodates a wide range of municipal, industrial, institutional, and intake flows.
- Low headloss, continuous band, through flow fine or coarse screen
- Low Flow
- Heavy Duty
- Super Duty
- Front Discharge
Grid Opening Range
- 0.5mm to 75mm
- Stainless steel laced link
- Stainless steel wire mesh
- Stainless steel perforated panel
- UHMWPE perforated panel
- 0.1 mgd (5 L/s) to 160+ mgd (7,000+ L/s)
- Super Duplex
- High nickel stainless steels
The Bull Shark is known for its aggressive nature, ability to adapt to a wide range of environments, and skill in hunting in murky water. With a variety of grid types, opening sizes and models available, the Bull Shark Through Flow Screen is ideal in a wide range of environments. Low Flow, Standard, Heavy Duty, Super Duty and Front Discharge models are available.
Through flow design and large solid removal are trademarks of this versatile screen. All stainless steel construction and UHMWPE wear surfaces provide years of trouble–free operation. The extremely strong stainless steel grid reduces headlosses to well below industry standards.
- Heavy duty, high capacity continuous through flow fine or coarse band screen
- Ideal for large solids removal
- Unlimited support against deflection
- Multiple models available
Features & Benefits
Bull Shark Through Flow Family of Screens
The Heavy Duty Series is a robust version of the Bull Shark Standard Series. This model features heavy duty stainless steel axles, links, supports and drive and is designed to withstand harsher installations.
Super Duty Series
- Algae Removal
- Desalination Plant/RO Protection
- Drainage Canals
- Raw Water Intake
- Chemical Processing
- Food & Beverage
- Meat and Poultry Processing
- Pulp and Paper
- Textile Mills
- Cooling Water Intake – Power Generation
- Fish Farming
- Irrigation System Protection
- Petroleum Refinery
- Raw Water Intake – Potable Water
- Uranium Refinery
Screen Grid Options
Stainless Steel Laced Links
Rectangular Openings from 1-25mm
The Laced Link-style grid is ideally suited for water and wastewater applications where fine screening is required with low headlosses.
- Able to withstand extremely harsh environments
- Strongest grid available
- Excellent unloading of screenings
- Highest open area percentage/very efficient
- Easily handles large flows
- Extremely high open area percentages resulting in lower grid velocities
- Smaller footprint
- Wide range of opening sizes
- Versatile and proven
- Excellent in the screening of FOG and stringy material
- Municipal water and wastewater
- Combined storm overflow
- Pump and lift systems
- Sludge and septage receiving
- Food processing
- Less efficient capture of hair and fibrous material
- Lower screening capture ratio
Theory of Operation
Flow passes through the screen while solids are intercepted and collected by the continuously moving grid. Solids larger than the openings in the screen’s grid are collected and form a mat, which is removed undisturbed from the flow resulting in extremely high solids capture and easy unloading.
A low profile bottom shoe and polypropylene brush seals the grid, preventing solids from bypassing under the screen. Flow is constantly presented a clean grid surface as solids are transported to the top of the screen. Screenings are discharged into screening handling equipment.
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, reducing power and maintenance requirements and ultimately extending the life of the grid. Wide stainless steel tracks ensure years of trouble–free operation. Stainless steel grid elements provide superior strength while reducing area and headlosses. Heavy gauge stainless steel links are not susceptible to breaking and damaging downstream equipment.
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.
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%.
- 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
- 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
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.
- 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
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.
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.
Dry Unloading via BrushEfficient dry removal is achieved with a reversible and replaceable brush. Durable polypropylene brushes comb through the grid removing debris and cleaning elements. The brush can be unhinged for cleaning with the removal of a snap of two pins. Dry removal is suitable for small systems not concerned with cleaned or compressed screenings and may be combined with wet discharge. A rotating brush can be supplied but is not typically advised.
Unloading SprocketThis method utilizes patented plastic or stainless steel sprockets to drive the grid as well as index through the grid. As the sprockets push through the grid, screenings are separated and fall for disposal.
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
- 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
- T304, T316 and specialty stainless steel construction
- 60-90 degree angle options
- Rake spacing increments of 16” (400mm) beginning at 32” (812mm)
- Cold weather/freeze protection