Perrier Sorem gravity filters are designed to protect downstream hydraulic equipments such as river or sea water pumping stations. These filters are used to efficiently respond to the difficult operating conditions found in industry or in power stations.
When the filtering band is clogged, a pressure drop detector integrated into the filter triggers the rotation of the filter as well as the counter-current washing system. The waste is then evacuated by a washed-water collector. The pressure drops then decreases to its initial value.
Perrier Sorem gravity filters are available in 304L, 316L or duplex stainless steel and can be optionally fitted with electrical control cabinet, pressure drop detector and cathodic protection.
Perrier Sorem traveling band screens have a classic profile with parallel faces or in a “pear” shape without a frame, which makes it possible not to exceed the admissible values of the output speeds, without unnecessarily increasing the height of the wire rake. All the constituent elements have been studied and dimensioned in such a way as to allow occasional overloads without disturbing operation.
The filtering band is made of a set of filtering frames, fixed on two endless chains, placed on each side and resting on two gears mounted on a drive shaft. The chain links are fitted with rollers which run on bearings sets fixed to the frame.
The chains links are fitted with rollers which roll on tracks fixed to the frame.
Traveling band screens
Technical data
Model
GRF-A
Model
GRF
Type of filter
Traveling band screen
Traveling band screen
Filtration direction
Exterior to interior or perpendicular to the current
Exterior to interior or perpendicular to the current
Waste lift speed
0,15 m/s
de 0,1 à 0,2 m/s
Waste washing system
By nozzle ramp
By nozzle ramp
Position of the discharge chute
Outside the filter
Outside the filter
Sealing between the filter belt and the frame
Slippery seals on friction plates
Slippery seals on friction plates
Gear motor power
from 0,37 to 7,5 kW
from 2 to 15 kW
Filter drive mode
Direct shaft drive
Direct shaft drive
Filtration mesh (min / max)
0,5×0,5 / 10×10 mm
0,5×0,5 / 10×10 mm
Usable filtration length (min / max)
400 / 1800 mm
1800 / 3000 mm
Maximum filtration flow
30000 m3/h
70000 m3/h
Minimum hopper width
1210 mm
1700 mm
Minimum hopper length
775 mm
2240 mm
Minimum pit width
2700 mm
3500 mm
Minimum pit length
At least equal to the length of the hopper
At least equal to the length of the hopper
Minimum pit depth
1700 mm
2900 mm
Electrical connection
on terminal block
on terminal block
Construction material
304L stainless steel
304L stainless steel
Options
Electrical control box, specific motor, construction materials, level detection and differential measurement, etc.
Traveling band screens
Operation
The filter band clogs as the retained waste builds up, creating an increase in pressure drop. This is controlled by a pressure drop detector associated with the rotating grid.
When the pressure drop reaches a preselected and adjustable value, the grid gear motor is energized.
It rotates the filter and the washing system opens, triggering the backwashing of the filter elements.
The water, thus loaded with impurities, is discharged into the chute.
The pressure drop then decreases to its initial value, which corresponds to obtaining a clean filter band.
Traveling band screens
Installation
Perrier Sorem GRFs are available in 2 versions:
Double flow : filtration is carried out from the outside to the inside.
Single flow : the filter element is perpendicular to the stream.
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