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Beaudrey - Center-Flow Travelling Band Screen
Installed in a channel in which the water to be cleaned flows, the screen consists of a set of rectangular screening mesh panels carried by two endless chains. The panels travel up and down again between an upstream partition set across the channel, with an inlet central aperture and a downstream wall set across the channel. The water enters through the aperture in the upstream partition, flows through the upstream face of the panels on each side, where the debris are arrested. The water flows out through the apertures on both sides of the downstream wall-plate.
Travelling screens are used to arrest the small debris contained in the water so that the downstream users remain unobstructed and clean (condensers, exchanges, spray-water circuits, membranes etc). Debris can be of all types including fish, shrimps, jellyfish, grass, man-made refuse, plastics, seaweed, etc. They are especially suited to deep pits.
They are used in thermal and nuclear power plants, LNG terminals, desalination or fertilizer plants, drinking water, sewage and irrigation plants.
The debris-laden panels travel up above deck level, around the top and down again. One or two spray pipes with fantail jet nozzles set on the down stream side of the panels within the screen’s head structure, back-wash the panels, remove the debris which are projected into a collection trough. They travel in a deck flume to the debris disposal system (basket, separator, etc.)
The screens are normally stopped and are washed periodically when obstructed by debris. Permanent rotation can be provided.
- Large debris-handling capacity
- Compact civil structure
- Fully automatic
- Capable of high-speed rotation
- Fish-friendly option
- Reduced maintenance
- Cost effective
- No debris carry-over
- Easy access to external debris trough
- No internal debris interference
- Spray-water supply circuit
- Head-loss monitoring system
- Electrical control cabinet
- Upstream bar rack (25 to 75 mm spacing (1 to 3”)
- Pit dewatering stoplogs
- Trash collecting system (basket, etc).
- Mesh aperture
- From 1x1 to 10x10 mm (0.04 to 3/8”)
- Flow rates
- Up to 70000 m3/h (300000 gpm)
- Tidal variation
- No practical limit
- Panel frame useful width
- 0.6 to 4 m (2 to 13 ft)
- Wider machines on special order
- Two or three-speed operation
- Seismic qualification
- Special high travel speed design for handling heavy debris loads
- Jellyfish lifting trays
- Screening medium resistant to fiber build-up
- Screening medium preventing jellyfish adherence
- Low pressure water-life protection system
- Atex compliance
- “Scoop-a-fishTM” total fish survival system
- Wall-mounted chain guides on full carrying structure
- By-pass valves
- Main structure, panels, frames, guide rails
- For fresh-water applications: painted carbon steel or AISI 304L stainless steel
- For seawater applications: AISI 316L stainless stee, duplex or super-duplex stainless steel
- Head-shaft, sprockets, chain links and pins, tensioning capstan screws
- For fresh-water applications: High-tensile steel
- For seawater applications: Duplex or super-duplex stainless steel
- Bolts, nuts, washers
- For fresh-water applications: A2 or A4 stainless steel
- For seawater application: A4, duplex or super-duplex stainless steel
- Small fittings, spray-water pipes
- For fresh-water applications: AISI 304L stainless steel
- For seawater applications: AISI 316L, duplex or super-duplex stainless steel
- Screening mesh frames, sprocket teeth
- In all cases: composite materials
- Covers
- GRP or stainless steel on special request
- Anodes
- None required for fresh-water applications
- For seawater applications: required for use with AISI 316L stainless steel and sometimes for duplex stainless steel.