ABS RW 200-650

Summary

Product identification

The ABS RW 200 – RW 650 series are compact and versatile submersible mixers designed for a wide range of applications, including use in aggressive and abrasive liquids. This economical yet robust range features integral motors.

Main Applications

• Mixing and stirring in sewage treatment plants and industrial areas:
  • Equalization of sewage
  • Biological processes (aerobic, anoxic, and anaerobic)
  • Selector (contact zone)
• Homogenization of highly concentrated sludge and slurries:
  • Primary, secondary, and digested sludge in storage and buffer tanks
  • Lime and mineral slurries
• Mixing in pump sumps (RW 200/280): Prevention of deposits and floating crusts.
• Hazardous locations: Certification for ATEX (Ex II 2G k Ex d IIB T4), FM, and CSA available as an option.

Operating limits

• Propeller diameter: 200 – 650 mm (7.9 – 25.6 in)
• Motor power (50 Hz): up to 11 kW
• Motor power (60 Hz): up to 13 kW (up to 17.5 hp)
• Motor efficiency (50 Hz): up to 87%
• Motor efficiency (60 Hz): up to 88%
• Mixing flow (50 Hz): up to 0.83 m³/s
• Mixing flow (60 Hz): up to 0.92 m³/s (up to 14,600 USgpm)
• Calculated lifetime: More than 100,000 operating hours for bearings.
• Continuous running: 24/7

Electrical

• Motor type: Efficient three-phase motor, water pressure-tight encapsulated.
• Protection type: IP 68
• Stator insulation class: F (155°C)
• Thermal control: TCS (Thermo Control System) provides a warning or automatically switches off the motor before the permissible temperature limit is exceeded.

Mechanical / hydraulic

• Design: Compact, water pressure-tight design with dynamically balanced motor shaft and rotor.
• Bearings: Large, long-lasting bearings, lubricated for life, requiring no maintenance.
• Seal monitoring: DI-system for seal monitoring and indication when inspection is due.
• Seal protection: Solids deflection ring and enhanced mechanical seal protection to prevent damage from solids/fibrous matter and keep the seal clog-free, extending its life.
• Suspension: Abrasion-resistant galvanically insulated guide tube and suspension to reduce electrochemical corrosion.
• Corrosion resistance: Suitable for industrial applications and nitrification tanks in Wastewater Treatment Plants (WWTP).

Materials

• Mixer parts RW 400 – RW 650 (EC - cast iron):
  • Motor housing: EN-GJL-250, painted
  • Motor shaft / propeller shaft: 1.4021 (AISI 420)
  • Propeller: 1.4571 (AISI 316)
  • Fasteners: 1.4401 (AISI 316)
• Mixer parts RW 400 – RW 650 (CR - stainless steel):
  • Motor housing: 1.4571 (AISI 316)
  • Motor shaft / propeller shaft: 1.4404 (AISI 316)
  • Propeller: 1.4571 (AISI 316)
  • Fasteners: 1.4401 (AISI 316)
• Mixer parts RW 200 and RW 280 (EC - cast iron):
  • Motor housing: EN-GJL-250, painted
  • Motor shaft / propeller shaft: 1.4021 (AISI 420)
  • Propeller: EN-GJL-250, painted
  • Fasteners: 1.4401 (AISI 316)
• Mixer parts RW 480 (EC - cast iron):
  • Motor housing: EN-GJL-250, painted
  • Motor shaft / propeller shaft: 1.4021 (AISI 420) / 1.4418 (AISI -)
  • Propeller: 1.4571 (AISI 316)
  • Fasteners: 1.4401 (AISI 316)

Propeller Design

• RW 400 and RW 650: Hydraulic-optimized, 2- or 3-blade axial flow propeller design, ensuring high mixing performance and self-cleaning.
• RW 480: Special 2-blade mixed-flow propeller design, generating strong rotating turbulent flow in radial and axial directions, highly efficient for homogenization of concentrated sludge and slurries.
• RW 200 and RW 280: Hydraulic-optimized, 2-blade axial flow propeller design running at high speed (4 poles), creating strong rotating turbulent flow in axial direction, highly efficient for homogenization of raw sewage and floating crusts.

Gearbox (RW 480 only)

• Helical one-stage robust gearbox, allowing numerous ratios via fatigue-strength helical gears.
• Calculated lifetime of more than 100,000 hours for the oil-lubricated bearings.

Mounting (RW 200 and RW 280)

• Versatile mounting bracket for hanging installation, allowing adjustment of both vertical and horizontal orientation to remove sediments from dead zones. Minimal installation footprint.

Sump Sizing (RW 200 / RW 280)

• Round sumps:
  • RW 200: Max. diameter 3.5 m
  • RW 280: Max. diameter 5.0 m
• Rectangular tanks:
  • RW 200: Max. size 3 x 5 m
  • RW 280: Max. size 4 x 6 m

Specific Power Density (RW 200 / RW 280 in pump stations)

• Municipal raw sewage: 25 - 40 W/m³
• Sewage containing lots of solid materials: 50 - 80 W/m³
• Sewage containing lots of sandy materials: 100 - 200 W/m³

Operation (RW 200 / RW 280 in pump stations)

The mixer is controlled by a level control unit, switching on shortly before the pumps. A timer typically allows 30 to 45 seconds of mixing before pump startup. An additional level control unit switches off the mixer when 30 to 40 cm of propeller coverage remains.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the official OEM PDF. Contractual data must always match the specific OEM PDF revision used for the project.

Official datasheet (PDF)

Lenntech datasheet mirror