TRASH RAKES - R TYPE (ROTATING CHAIN)
PURPOSE AND APPLICATION
The “R” type trash rake removes from the water, large quantities of medium-small debris (grass, seaweed, jellyfish, etc.).
Used whenever large quantities of small debris are expected (power plants, LNG terminals, chemical or desalination plants, drinking water plants).
“R” Rakes are installed in the screening plant upstream of the travelling screens or the drum screens. The water flows across the inclined bar rack where the debris are arrested. The trash collecting rakes are held on two endless chains. They travel down, well clear of the bar screen, run around the bottom rail meshing between the bars. The debris are removed and loaded into the trash collecting rakes, they travel upwards. At deck level, the debris are swept out of the rakes into the collection trough or basket. Two or three travel speed operation is provided.
Cleaning is started either by a timer, the operator or the head-loss monitoring system.
Debris-handling capacity is high due to the number of rakes. It can be increased when required
No possible oil spillage
Well-proven, sturdy design
Easy, reduced maintenance
Low induced head-loss
Head-loss monitoring system
Electrical control cabinet
Pit dewatering stoplogs
Upstream bar rack if very heavy debris (tree trunks, etc) are expected
Trash collection system (baskets, etc).
SIZES AND DATA
Standard width from 1 to 4 m (3.3 to 13 ft), wider on specific request
Installation at 15° incline
Bar spacing from 15 to 50 mm (5/8 to 2”)
Increased number of rakes
Operation started by a timer, head-loss or operator
Bar rack, rake guides, structure, debris slide, top shaft sprockets:
For fresh-water applications: painted carbon steel or AISI 304L stainless steel
For seawater applications: AISI 316L stainless steel with anodes, duplex or super-duplex stainless steel
Rake tines, rollers:
In all cases: composite materials
For fresh-water applications: AISI 304L stainless steel
For seawater applications: AISI 316L stainless steel, duplex or super-duplex stainless steel
Chain links, pins/ rollers:
In all cases: duplex stainless steel/polyamide