Submersible sewage pump with mechanical stirring apparatus


  • In grit chambers
  • For pumping sludge

Type key

Example: Wilo-EMU FA 08.52WR + T 17-6/16H Ex
Hydraulics: FA 08.52WR
FA Submersible sewage pump
08 x10 = nominal diameter of the pressure port, e.g. 80
52 Performance indicator
WR Vortex impeller with mechanical stirring apparatus
Motor: T 17-6/16H Ex
T Motor version
17 Size
6 Number of poles
16 x10 = package length [mm]
H Seal version
Ex Ex-rated

Special features/product advantages

  • Mechanical mixer unit made of Abrasit to avoid deposits in the pump sump
  • Process reliability thanks to comprehensive monitoring devices
  • Minimal vibrations and long service life due to high-quality components
  • Customer-specific versions possible

Technical data

  • Mains connection: 3~400 V, 50 Hz
  • Immersed operating mode: S1
  • Surfaced operating mode with self-cooling motor: S1
  • Protection class: IP 68
  • Max. fluid temperature: 3 ‐ 40 °C, higher temperatures on request
  • Sealing: With rotary shaft seal and mechanical seal, two mechanical seals or one block seal cartridge, depending on the motor
  • Free ball passage: 23 – 58 mm.
  • Permanently lubricated roller bearings
  • Max. immersion depth: 20 m


  • Heavy-duty version made of grey cast iron
  • Self-cooling motors with 1‐ or 2-chamber system
  • Simple installation via suspension unit or pump base
  • Mechanical stirring apparatus is fastened directly to the impeller
  • Mixer head made of chilled cast iron, Abrasite


Submersible sewage pump with mechanical stirring apparatus as submersible monobloc unit for stationary and portable wet well installation.


The outlet on the pressure side is designed as horizontal flange connection. The maximum possible dry matter content is 8%, depending on the hydraulics and impeller type.

Vortex impellers are used exclusively as the impeller shape. A mechanical stirring apparatus is mounted to these as an axial extension of the motor shaft. The mixer head is made of Abrasite chilled cast iron.


Dry motors (T motors) give off their heat directly to the surrounding fluid via the housing components and can be used in immersed state for continuous duty.

The oil-filled motors (FK motors) and self-cooling dry motors (FKT, HC motors) give off their heat to the pumped fluid via a built-in heat exchanger. As a result, these motors are suitable for continuous duty either in immersed or non-immersed state.

All motors have a sealing chamber that protects the motor from fluid ingress. It can be accessed from the outside and can be monitored with an optional sealing chamber electrode.

All filling fluids used are potentially biodegradable and environmentally safe.

The cable inlet on T, HC and FKT motors is longitudinally watertight. Up to motor size 17, cable lengths are available in fixed lengths measured in 10 m intervals. Starting from motor size 20, the cable length can be individually configured.


Fluid-side and motor-side sealing is possible in the following versions depending on the motor type:

  • Version H: Mechanical seal for the fluid side, rotary shaft seal for the motor side
  • Version G: Two independently operating mechanical seals
  • Version K: Block seal cartridge with two independently operating mechanical seals


  • Housing components: EN-GJL
  • Impeller: EN‐GJL or EN‐GJS
  • Static seals: NBR
  • Sealing on pump side: SiC/SiC
  • Sealing on motor side: NBR or SiC/SiC
  • Shaft: Stainless steel 1.4021
  • Stirring apparatus: Abrasite

Scope of delivery

  • Submersible sewage pump with mechanical stirring apparatus
  • Up to motor size 17, cable lengths are available in fixed lengths measured in 10 m intervals; starting from motor size 20, per customer request
  • Accessories per customer request
  • Operating and maintenance manual


  • Suspension unit or pump base
  • Various pressure outlets and Storz couplings
  • Chains
  • Fixation sets with anchor bolts
  • Switchgears, relays and plugs