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RF800LW Self-cleaning Eel Screen & Intake Strainer

From £9,955.00 GBP

The RF800LWs are extremely tough stainless steel self-cleaning basket filters that protect pumps and other connected equipment from blocking and blinding when pumping dirty water. When fitted with 2 mm mesh they are ideal EA Eel regulation compliant Eel screens.

The RF800LW self-cleaning Eel Screening intake strainers provide industrial strength, low maintenance filtration for surface mounted pumps. They are coarse screened filters fitted with 1 mm - 6 mm stainless steel mesh screens.

Our award-winning self-cleaning mechanism in the filters provides a continuous backwash keeping the filter mesh free of weed, debris and other suspended solids, and their low intake velocity protects elvers, and other aquatic wildlife.

The RF800LWs can handle 277 m3 to 1085 m3 per hour.

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Key Features

  • 316 Stainless Steel filter mesh
  • Filters from 1mm to 6mm
  • Reliable and easy to install and use
  • 1085 cubic metres per hour maximum flow
  • 542 cubic metres per hour maximum flow @ 0.1 metres / sec
  • Capital, installation and maintenance costs reduced
  • All Stainless Steel construction
  • Differential pressure switch for protection
  • Option for marine grade steel.

RF800LW Self-cleaning Eel Screen

Description

RF800LW Self-cleaning Eel Screen & Intake Strainer

RF800LW Self-cleaning Eel Screen Intake Strainers are designed for use on the suction hose of surface mounted pumps. They can also be used as gravity fed intakes as long as a pump is used to supply the backwash. Most new and renewed abstraction licences require measures to be put in place for the Protection of European Eels. Rotorflush RF800LW Self-cleaning Eel Screens have been specifically designed to meet this requirement.

The RF800LW Self-cleaning Eel Screen Intake Strainers are the highest capacity self-cleaning strainers Rotorflush offer. They can deliver a maximum of 217 m3/ hour – 1085 m3 / hour through tensioned woven Stainless Steel mesh. The maximum flow rates for RF800LW screens for elvers and glass eel protection range from 108 m3 / hour – 542 m3.  This reduction is so that the intake velocity of the water does not exceed 0.1 metres a second.

Read this article in Water Magazine about our Innovative Approach to Eel Screening

RF600LW Self-cleaning Eel Screen - how it works

The RF800LW range of Eel screens can be fitted with 316 grade Stainless Steel filter mesh, mesh aperture sizes can be from 1 mm to 6 mm. The maximum open area these screens offer is 60% when fitted with 2 mm aperture woven steel mesh (US 10 Mesh). The mesh is under tension and forms the body of the screen, maximising the mesh area.

The self-cleaning mechanism in our filters and strainers uses a proportion of your pump’s output to supply a feed to an internal backwashing rotor. Rotorflush self-cleaning eel screens are powered by taking a ‘T’ off the already filtered pump output to supply the Rotorflush internal rotors. The cleaning rotors push away anything that might cause the mesh to block with a continuous backwash.

Alternatively, the mesh can be kept clear by using a small backwash pump to drive the cleaning rotors. This allows the self-cleaning Eel Screens to be gravity fed, as is the case with many raw water intakes from rivers.

Each RF800LW screen is fitted with a differential pressure switch to monitor the pressure inside and outside the screen, and to switch off the main pump if the pressure difference is too great. The switch protects the screen mesh from damage in the unlikely event of a sudden screen blockage. Having one correctly installed is a condition of our product guarantee.

Rotorflush filters and strainers are all fitted with our patented self-cleaning technology, delivering an efficient backwash to keep their filter mesh clear and to protect aquatic life.

Models & Specification

RF800LW Self-cleaning Intake Strainer – General

There are nine models of RF800LW self-cleaning eel screens & intake strainers offering a broad range of capacities

Flow Rates and Capacities

 Rotorflush Model Filter screen Area cm2 Maximum Flow Rate m3/hr (net of backwash)* Eel Regulations Max
Flow rate (net of backwash)
m3/hr @ 0.1 m sec**		 Backwash Flow Rate m3/hr Backwash Pressure Mesh: 1 mm – 6 mm, max % Open Area
RF800-200LW 5,025 217 108 9 0.4 bar 60
RF800-300LW 7,540 325 162 13.5 0.4 bar 60
RF800-400LW 10,050 434 217 18 0.4 bar 60
RF800-500LW 12,565 542 271 22.5 0.4 bar 60
RF800-600LW 15,080 651 325 27 0.4 bar 60
RF800-700LW 17,590 760 380 31.5 0.4 bar 60
RF800-800LW 20,105 868 434 36 0.4 bar 60
RF800-900LW 22,615 977 488 40.5 0.4 bar 60
RF800-1000LW 25,130 1,085 542 45 0.4 bar 60

**Maximum flow rates are those for screens fitted with 60% open area 2 mm (US 10) mesh
**Approach velocity recommended for compliance with Regulations for the Protection of European Eels.

Note, EPA Rule 316(b) for final cooling water intakes recommends an intake velocity of not greater than 0.5 ft per second (0.15 metres a second). For this intake velocity, add half as much again to the Eel Regulations Max Flow rate in the table above.

RF800LW self-cleaning Eel screen in production
An RF800-900LW Eel Screen in Production

 

All Stainless steel inside and out
View from above

Rotorflush filters can customise these filters. Mesh types and outlet flange sizes can be varied to suit particular applications. Please contact us to discuss your requirements.

RF800LW Self-cleaning Intake Strainer – Dimensions

Model H1 Total Height mm H2 Mesh Height mm D1 Total Diameter mm D2 Mesh Diameter mm D3 Flange Diameter mm Approx Weight kgs
RF800-200LW 575 200 950 800 405 190
RF800-300LW 675 300 950 800 405 200
RF800-400LW 775 400 950 800 405 210
RF800-500LW 875 500 950 800 405 220
RF800-600LW 975 600 950 800 405 230
RF800-700LW 1,075 700 950 800 405 240
RF800-800LW 1,175 800 950 800 405 250
RF800-900LW 1,275 900 950 800 405 260
RF800-1000LW 1,375 1,000 950 800 405 270

RF800-900LW self-cleaning Eel Screen being deployed at a raw water intake at water treatment works
Installing an RF800-900LW Eel screen at a Water Treatment Works intake

RF800LW Self-cleaning Intake Strainer – Construction

 

RF800LW Insides and out

 

RF800LW and RF600LW Tensioning Rods

 

RF800LW detail mesh and flange

Filter Component Construction
2mm aperture filter mesh 316 Stainless Steel or Phosphor Bronze
Filter uprights 304 or 316 Stainless Steel
Filter top and bottom plate 304 or 316 Stainless Steel
Top and bottom plate bolts & fastenings 304 or 316 (A2 or A4)  Stainless Steel
Tensioning nuts, M20 x 6, 15mm thick Phosphor Bronze PB 102
Cleaning rotor 304 or 316 Stainless steel
Cleaning jet restrictors ABS
Rotor bearings Acetal
Top and bottom rotor bearings 304 or 316 Stainless steel
Rubber jets Natural Rubber
Rubber jet clips 304 or 316 Stainless steel
Lifting eyes 304 or 316 Stainless steel
Top flange 304 or 316 Stainless Steel, standard is DN 250 PN 16, other sizes may be fitted
Backwash connection 316 Stainless Steel, 3” BSP
Tensioning assemblies Hi-tensile steel, Delta Tone 9000® inorganic, non – electrolytically applied micro layer zinc – Lamella flake coating

Note: 316 Marine grade Stainless Steel is an option for all RF800LW filters

Please Note: Our filters are designed for use in dirty water or liquids with a viscosity close to that of water. Our filters and filterpumps are NOT suitable for use in raw sewage or any other dirty water which contains oils or fat.

Ordering

Rotorflush RF800LW Self-cleaning Intake Strainer – up to 301 litres per second
Model Price £ (GBP – exc. VAT)   Model Price £ (GBP – exc. VAT)
RF800-200LW £9,955.00 RF800-700LW £11,670.00
RF800-300LW £10,295.00 RF800-800LW £12,100.00
RF800-400LW £10,455.00 RF800-900LW £12,480.00
RF800-500LW £11,020.00 RF800-1000LW £12,760.00
RF800-600LW £11,340.00 Prices for standard Screens with 304 Stainless steel, 10″ outlet

Deployment of RF800LW Eel Screen

Please state filter mesh size:

1 mm – 6 mm woven Stainless Steel mesh is available

Standard fittings are 10″  PN 16 outlet, and 3″ inch BSP inlet to the backwash.

Other flange sizes can be fitted

These filters can be manufactured using 316 Stainless Steel for marine use, please enquire.

Please note:

Delivery is by carrier.  Contact us for latest lead times.

Carriage and packing charges are extra.

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