Coarse Screen
A coarse screen is a pre-filtration screening system
A coarse screen is the first (primary) barrier within a water intake ‘screening train‘ and is intended to withstand and remove all large to relatively small contamination in an open channel water intake. Debris can be natural like seaweed and jelly fish, or man-made plastic, etc.
A coarse screen is basicly a robust static bar rack with or without an automated trash rake and dirt removal infrastructure. Distance between bars is usually 10 to 100 mm.
Hubert supplies various coarse screens tailored to every (local) situation. All screens are suitable for use in aggressive environments such as seawater.
A static bar screen can be used with an integrated cable based gripper (damran). Multiple static screens can be equipped with an automated trash rake gripper travelling in front of and along the screens. A static screen can also be equipped with compact and integrated high capacity revolving (rotating) trash rake (WISA) or rarely with a linear rake (KOBAR).
Below you will find an explanation of frequent applied coarse screens.
Hubert – Water Intake Systems
Hubert is specialized in water intake systems for cooling, drinking and process water
Hubert is market leader in water intake screening systems. These systems can be found in power stations, petrochemical plants and refineries, desalination plants, drinking water and irrigation plants and industrial production plants requiring a huge demand of process water. We supply complete ‘screening trains’ including all additional equipment, like controls and cathodic protection. We are active in both new construction (EPC) projects and renovation and optimization of existing water intakes.
Water intake systems are used for mechanically clean water extracted from the sea, rivers or lakes. See also Markets and Applications
This movie includes an animation of a typical water intake, showing the water flow from the suction from the sea to the arrival at the pumps.
Hubert – Water Intake Systems
Hubert is specialized in water intake systems for cooling, drinking and process water
Hubert is market leader in water intake screening systems. These systems can be found in power stations, petrochemical plants & refineries, desalination plants, drinking water & irrigation plants and industrial production plants requiring a huge demand of process water. We supply complete complete ‘screening trains’ including all additional equipment, like controls and cathodic protection. We are active in both new construction (EPC) projects and renovation & optimization of existing water intakes.
Water intake systems are used for mechanically clean water extracted from the sea, rivers or lakes. See also Markets & Applications
Common pollution filtered and removed by a Hubert coarse screen
Seawead
Jellyfish
Man-Made Waste
Static Bar Screen
A Hubert Static Bar Screen: the basic solution to withstand & filter water
A static bar screen, also called stationary screen, can be subject to enormous forces and is therefore calculated for your project application. The design is simple, robust and functional with a maximum cleaning result. The Hubert static Bar screen can be provided with raking systems to remove debris.
Trash Rake Gripper
A Hubert Trash Rake Gripper can be used with a Static Bar Screen or Hubert DAMRAN
The Hubert automated cable operated trash rake gripper (or grab cleaner) can be used in front of multiple static bar screens or racks for direct cleaning of the debris from the incoming flow.
In addition, it can be placed behind multiple Hubert DAMRANS for taking locally collected debris. Depending on your project and wishes, many are configurations are possible.
WISA – Revolving Coarse Screen
A Hubert Chain Operated Coarse Screen used for medium flows is called WISA
A Hubert WISA is a revolving bar screen or revolving chain screen. It is also called a rotating rake screen. The design is simple, robust and functional with a maximum cleaning result. The Hubert WISA coarse screen is ideal for removing large quantities of debris in a short time.
DAMRAN – Coarse Screen
A Hubert Cable Operated Bar Screen used for large water flows is called DAMRAN
The cable operated DAMRAN machine is used particulary for removing medium and large coarse debris from a water inlet. This highly reliable machine can be used independently or in series side by side.
Mobile DAMRAN – Coarse Screen
A Hubert Mobile DAMRAN is a variant of the standard DAMRAN
KOBAR – Coarse Screen
A Hubert KOBAR chain operated bar screen is used for small water flows
Static Bar Screen
A Hubert static bar screen: the basic solution to withstand and filter water
A static bar screen, also called stationary screen, can be subject to enormous forces and is therefore calculated for your project application. The design is simple, robust and functional with a maximum cleaning result. The Hubert static bar screen can be provided with raking systems to remove debris.
Design and Construction
Our standard static bar screen is a robust welded / bolted construction consisting of beams and rods, with the opening determined by the application. The construction is always calculated (in connection with possible forces occurring). Fixation takes place with anchors in the walls of the channel.
Features and Benefits
- Ideal for removing large quantities of debris
- Maintenance free
- Design operating life of around 35 years
Standard Dimensions and Materials
- Width up to 4 m (special configurations up to 6 m)
- Pit depth (height) up to 15 m
- Bar space 20/100 mm
- Installation angle 70/90°
- Materials can be coated carbon steel, stainless steel and exotic alloys (a variety of (super) duplex grades)
Trash Rake Gripper
A Hubert trash rake gripper can be used with a static bar screen or Hubert DAMRAN
The Hubert automated cable operated trash rake gripper (or grab cleaner) can be used in front of multiple static bar screens or racks for direct cleaning of the debris from the incoming flow.
In addition, it can be placed behind multiple Hubert DAMRANS for taking locally collected debris. Depending on your project and wishes, many are configurations are possible.
Design, Construction and Operation
The static bar screen retains the debris and the grab carriage or gripper elevates and discharges the waste to a container, concrete gutter, trailer or other designated area. Structures and components have been designed to withstand the hydrostatic force and different heads. This system can operate fully automated.
Overhead Gantry
The overhead gantry monorail and portal is constructed from high quality heavy duty steel. The drive track is positioned approx 4.5 m above deck level.
Features and Benefits
- No maintenance parts below water level
- One screen cleaner is able to clean multiple screens
- Removes large objects
- Indirect cleaning (behind Hubert Damran)
- Direct static screen cleaning
- Debris can be disposed directly in container/trailer
- No maintenance parts below water level
- Fully automated system
Standard Dimensions and Materials
- Gripper width up to 4 m
- Length of overhead gantry up to 25 m or more
- Pit depth 10 m
- Bar space 20 – 100 mm
- Max. water level 4 m
- Materials can be coated carbon steel, stainless steel and exotic alloys (a variety of (super) duplex grades)
WISA – Revolving Coarse Screen
A Hubert chain operated coarse screen used for medium flows is called WISA
A Hubert WISA is a revolving bar screen or revolving chain screen. It is also called a rotating rake screen. The design is simple, robust and functional with a maximum cleaning result. The Hubert WISA coarse screen is ideal for removing large quantities of debris in a short time.
Design and Construction
This raked bar screen is fitted with a number of revolving rakes which removes the debris from the bottom of the screen in an upwards movement. The screen is designed for front-raked operation. This raked coarse screen can be configurated as a pre-assembled WISA SKID unit for direct installation on site or it can be configurated as an embedded WISA unit mounted against the concrete walls on embedded anchor plates. An embedded WISA configuration is ideal for relative wide and deep channels.
Features and Benefits
- Ideal for removing large quantities of debris
- Maintenance free
- No grease points – greased for life!
- The WISA can be manufactured with a special add-on for removing and discharging large quantities of jellyfish
Standard Dimensions and Materials
- Width up to 4 m
- Pit depth (height) up to 15 m
- Bar space 20/100 mm
- Installation angle 70/90°
- Materials can be coated carbon steel, stainless steel and exotic alloys (a variety of (super) duplex grades)
DAMRAN – Coarse Screen
A Hubert cable operated bar screen used for large water flows is called DAMRAN
The cable operated DAMRAN machine is used particulary for removing medium and large coarse debris from a water inlet. This highly reliable machine can be used independently or in series side by side.
Design and Construction
The raking mechanism consists of a trolley with nylon wheels which run in guides in the channel. The rake is in an open position when moving downwards.
At the bottom of the channel the rake closes and removes all debris from the coarse screen starting from the bottom up. At deck level the debris is removed from the rake by a scraper and discharged on a belt-conveyor, a concrete gutter or a container, as per clients wishes.
Features and Benefits
- Cable-operated, no moving parts under water level
- Cleaning large flows
- Low installed power, low energy cost
- Low maintenance
Standard Dimensions and Materials
- Width up to 4 m
- Pit depth (height) up to 15 m
- Bar space 20/100 mm
- Installation angle 70/90°
- Materials can be coated carbon steel, stainless steel and exotic alloys (a variety of (super) duplex grades)
Mobile DAMRAN – Coarse Screen
A Hubert Mobile DAMRAN is a variant of the standard DAMRAN
The Hubert mobile DAMRAN cleans mulitple-screens installed side by side and used for large inlet water flows, also in deep chanels. This machine is a front cleaning cable operated coarse screen suitable for cleaning medium sized to large inlet chanels (floating and diving debris).
Design and Construction
The Hubert mobile DAMRAN bar screen consists of a traverse carriage with a raking mechnism. The raking mechanism moves on rail tracks along (mutilple) bar screens, which it cleans section by section over the whole width of the intake channel.
The rake is able to handle small spacing’s (less than 30 mm) and deep channels. This type cleans the coarse screen in the upwards stroke ( by winding the cable system) when the teeth are positioned between the bars of the screen and can be forced with the cable, resulting in optimal cleaning. Orientation of the screen can be almost 90°.
The mobile DAMRAN can also be fitted with a control platform or cabin with a control panel and a debris hopper.
Features and Benefits
- Cable-operated, no moving parts under water level
- Cleaning large flows
- Low installed power, low energy cost
- Low maintenance
Standard Dimensions and Materials
- Width up to 4 m
- Pit depth (height) up to 15 m
- Bar space 20/100 mm
- Installation angle 70/90°
- Materials can be coated carbon steel, stainless steel and exotic alloys (a variety of (super) duplex grades)
KOBAR – Coarse Screen
A Hubert KOBAR chain operated bar screen is used for small water flows
The Hubert Kobar chain operated raked coarse screen is provided with a linear moving rake. This screen system is applied for pre-cleaning of relative small water flows in chanels with low water levels and is rarely used in water intake systems (sometimes in an inlet for low-scale drinking water production in a fresh water environment). Applications are more often found in the influent of wastewater treatment.
Design and Construction
The Hubert Kobar chain-operated coarse screen construction is based on channels with a low water level and is especially designed for vertical or slightly inclined installation. The screen is designed for front-raked operation.
This bar screen is manufactured as a pre-assembled unit for direct installation into postion on site. The simple rigid and robust design ensures reliable operation with maximum cleaning of the incomming flow.
Features and Benefits
- No moving parts below water level
- Maintenace free
- One (1) cleaning cycle over complete screen width
- Pre-assembled, skid mounted and easy to install
Standard Dimensions and Materials
- Width up to 4 m
- Pit depth (height) up to 12 m
- Bar space 6/20 mm
- Installation angle 70/90°
- Materials can be coated carbon steel, stainless steel and exotic alloys (a variety of (super) duplex grades)
