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TRASH RAKES - S TYPE (FIXED HEAD OR MOBILE)

Trash rake animation
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PURPOSE AND APPLICATION

Heavy-duty rake used to remove larger debris from the water (branches, plants, plastic cans, large seaweed, large crabs, man-made refuse, etc.). The “S” rake is used at the entrance of the screening plants of thermal and nuclear power stations, LNG terminals, desalination plants, fertilizer plants, drinking water, sewage and irrigation plants.

 

They can either have a fixed head structure (one rake cleans one bar screen) or be of a deck-travelling type (one rake cleans in turn a number of bar racks).

DESCRIPTION

The bar rack is installed across the pit. The rake is normally parked in its top position above deck. The comb is disengaged from the bar rack. When a signal is received, the rake travels downwards, directed by the wall guides. On reaching the bottom, the rake tilts from its open position to its raking position. The rake tines penetrate between the bars of the rack. The rake travels up-wards collecting and storing the debris. When the rake reaches the top, above deck, it tilts and the water brought up by the rake scoop flushes the debris away into the deck flume.

 

For the mobile, or deck-travelling version, the raking head is carried by a deck trolley running on two rails. It serves many screening lines, cleaning each one in turn. It is well-suited to plants with a low debris concentration. It is economical when there are at least four bar rack lines side-by-side.

Fixed head trash rakes

ADVANTAGES

  • Well proven, hundreds in service

  • Sturdy and reliable

  • High debris-removal capacity

  • No messy debris removal at the top

  • Economical

  • Fully-automatic

  • Minimal maintenance requirement

  • Can be fitted with the “Bio-Flush ™” fish-protection device

Heavy-duty, 3 cable, fixed head trash rake

SIZES AND DATA

  • Standard width from 1.5 to 5 m (3 to 16 ft). Wider rakes to special order

  • Bar spacing from 20 to 80 mm (3/4 to 3 inches)

  • Tidal variation: no limit in practice

OPTIONAL FEATURES

  • Two-speed rake vertical travel

  • “Bio-Flush ™”  fish-saving device

  • Seismic qualification

  • Built-in trash basket

  • Atex compliance

NECESSARY ANCILLARIES

  • Pit dewatering stoplogs

  • Head-loss monitoring system

  • Electrical control cabinet

  • Trash collection system

MATERIALS

Mobile trash rake

  • Bar rack, rake, wall guides, debris collector:
    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

  • Cable drum:
    For fresh-water applications: carbon steel
    For seawater applications: AISI 316L stainless steel

  • Top structure:
    For fresh-water applications: painted carbon steel
    For seawater applications: AISI 316L stainless steel

  • Rake tines, rollers:
    In all cases: polyamide

  • Bolts and nuts:
    For fresh-water applications: A2 stainless steel
    For seawater applications: A4 stainless steel, duplex or super-duplex stainless steel

  • Deck carriage (mobile version):
    For fresh-water applications: painted carbon steel
    For seawater applications: painted carbon steel or AISI 316L stainless steel

  • Deck wheels:
    In all cases: cast iron

  • Deck track:
    In all cases: carbon steel

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