Design

Application

• Activated sludge tank
• 4th cleaning stage
• Special applications

Liquid

For homogenisation and flow generation in commercial areas of:

• Process sewage
• Sewage containing faeces

Equipment/function

• Thermal motor monitoring with bimetallic strip
• Two-stage planetary gear
• 3-chamber system
• Operation with frequency converter possible

Additional equipment of the submersible mixers EMU TRE ...

• IE3 submersible motor(according to IEC 60034-30)

Type key

Technical data

• Mains connection: 3~460 V, 60 Hz
• Fluid temperature: 37 … 104 °F
• Submerged operating mode: continuse operation (S1)
• IP rating: permanently submerged (IP68)
• Insulation class: H
• Max. switching frequency: 15/h
• Max. immersion depth: 66 ft

Materials

• Housing: ASTM A48 Class 35/40B
• Seal:
  • Motor/sealing chamber: FKM
  • Gasket/gear chamber: SiC/SiC
  • Gear chamber/pre-chamber: FKM
  • Fluid side: SiC/SiC
• Propeller hub: ASTM A48 Class 35/40B or AISI 316TI
• Propeller: GFRP-VE or PA6G

Construction

Propeller

2- or 3-bladed propeller made of solid or composite material. Nominal propeller diameter of 20 in to 47 in with clogging-free propeller geometry.

Motor

Surface-cooled submersible motor in three-phase current design with permanently lubricated und large-size rolling bearings. The motor winding is equipped with temperature monitoring. The motor heat is given off directly to the surrounding fluid via the motor housing. The connection cable is designed for heavy mechanical loads, sealed water pressure-tight against the fluid and is sealed longitudinally watertight. The connection cable has bare cable ends and is 40 ft long as standard.

EMU TRE models:

The submersible motor meets the IE3/IE4 motor efficiency class (according to IEC 60034-30). Motors of the motor efficiency class “IE4” have been specified as “E4” in the motor designation.

Seal

The system is sealed by a 3-chamber system:

• Pre-chamber
• Gear chamber
• Sealing chamber

Pre-chamber

The high-volume pre-chamber has been filled with gear oil to absorb any leakage at the seal on the fluid side. A mechanical seal is used as the seal on the fluid side. A rotary shaft seal seals towards the gear chamber.

Gear chamber

The gear chamber has been filled with gear oil to guarantee continuous lubrication of the planetary gear and the gear bearings. A mechanical seal seals towards the sealing chamber.

Sealing chamber

The high-volume sealing chamber is filled with white oil and absorbs any leakage from the gear chamber. A rotary shaft seal seals towards the motor.

Gear

Two-stage planetary gear with exchangeable transmission. Gear bearings have been dimensioned large to absorb resulting stirring forces and not transfer these to the motor bearing.

Scope of delivery

• Submersible mixer with connection cable
• Propeller hub
• Propeller blade
• Accessories attached, depending on the installation type
• Installation and operating instructions

Options

• Thermal motor monitoring as temperature controller and temperature limiter
• Thermal motor monitoring with PTC sensor
• Fluid temperatures up to 140 °F, depending on the motor type and motor capacity
• Pre-chamber monitoring
• Ex-rated in accordance with ATEX, FM and IEC-Ex
• Ceram coating for housing parts made of grey cast iron
• IE4 submersible motor(according to IEC 60034-30)

Accessories

• Lowering device
• Auxiliary lifting device
• Cable bollard to secure the hoist cable
• Additional rope anchoring
• Fixation sets with anchor bolts