Wilo-Wilo-Sefa SA

Submersible sewage pump without cooling system for continuous duty in stationary wet well installation.

Pumping of

• Untreated sewage with faeces and long-fibre components (depending from impeller type)
• Sewage containing faeces
• Pre-cleaned sewage without faeces and long-fibre components
• Process water
• Wastewater

• Heavy-duty version made of grey cast iron
• Surface cooling motor without ex approval
• Motor monitoring devices:
  • Winding temperature
  • Moisture monitoring in the sealing chamber and motor/terminal chamber
  • Motor bearing temperature

• Mains connection: 3~380 V, 50 Hz
• Submerged operating mode: S1
• Non-immersed operating mode: -
• Protection class: IP68
• Insulation class: F
• Fluid temperature: 3 ... 40 °C
• Free ball passage: 80 ... 150 mm
• Max. immersion depth: 20 m

• Pump housing: grey cast iron
• Impeller: grey cast iron
• Static gaskets: Nitrile
• Fluid-side seal: Mechanical seal made of SiC/SiC
• Motor-side seal: Mechanical seal made of SiC/SiC
• Motor housing: grey cast iron
• Shaft: Steel

Submersible sewage pump as submersible monobloc unit for stationary wet well installation.

Hydraulics

Centrifugal hydraulics with various impellers and connection on the pressure side as a horizontal flange connection. The maximum possible dry matter content is 8 %, depending on the hydraulics and impeller type. The following impeller shapes are used:

• Vortex impeller (V)
• Channel impeller (C)
• Multi-channel impeller (M)
• SOLID impeller, closed (T)
• SOLID impeller, semi-open (G)

Motor

Surfaced-cooled motors are used. The motor is cooled by the surrounding fluid. The motor heat is transferred directly to the fluid via the motor housing. The motor must operate in immersed conditions. An operation of the motor in non-immersed operating mode is not possible!

The connection cable has bare (free) cable ends. The standard length is 12 m or can be customer specific.

Monitoring devices

• Motor/terminal compartment monitoring – The motor has internal moisture probes to detect water in the motor and terminal compartment.
• Thermal motor monitoring – The thermal motor monitoring protects the motor winding from overheating. PTC sensors are used as standard.
• Sealing chamber monitoring – The motor has an internal moisture probe to detect water in the sealing chamber.
• Thermal motor bearing monitoring – The thermal motor bearing monitoring protects the motor bearings from overheating. Pt100 sensors are used as standard.

Sealing

The sealing of the motor compartment against the fluid is realized by two independent mechanical shaft seals. The sealing chamber between the mechanical shaft seals is filled with medical white oil.

• Submersible sewage pump with 12 m connection cable
• Installation and operating instructions

• Special voltages and 60 Hz on request
• Winding monitoring with Pt100 sensor
• Customized cable length
• VFD operation on request

• Suspension unit
• Chains
• Fixation sets
• Switchgear and relays

Operation with non-immersed motor

Surface-cooled motors are not suitable for non-immersed operation. In the case of fluctuating fluid levels, the system should shut down automatically as soon as the minimum water submersion is reached.

Horizontal installation

Horizontal installation is not possible!

• Mains connection: 3~380 V, 50 Hz
• Submerged operating mode: S1
• Non-immersed operating mode: -
• Protection class: IP68
• Insulation class: F
• Fluid temperature: 3 ... 40 °C
• Free ball passage: 80 ... 150 mm
• Max. immersion depth: 20 m

• Pump housing: grey cast iron
• Impeller: grey cast iron
• Static gaskets: Nitrile
• Fluid-side seal: Mechanical seal made of SiC/SiC
• Motor-side seal: Mechanical seal made of SiC/SiC
• Motor housing: grey cast iron
• Shaft: Steel

Submersible sewage pump as submersible monobloc unit for stationary wet well installation.

Hydraulics

Centrifugal hydraulics with various impellers and connection on the pressure side as a horizontal flange connection. The maximum possible dry matter content is 8 %, depending on the hydraulics and impeller type. The following impeller shapes are used:

• Vortex impeller (V)
• Channel impeller (C)
• Multi-channel impeller (M)
• SOLID impeller, closed (T)
• SOLID impeller, semi-open (G)

Motor

Surfaced-cooled motors are used. The motor is cooled by the surrounding fluid. The motor heat is transferred directly to the fluid via the motor housing. The motor must operate in immersed conditions. An operation of the motor in non-immersed operating mode is not possible!

The connection cable has bare (free) cable ends. The standard length is 12 m or can be customer specific.

Monitoring devices

• Motor/terminal compartment monitoring – The motor has internal moisture probes to detect water in the motor and terminal compartment.
• Thermal motor monitoring – The thermal motor monitoring protects the motor winding from overheating. PTC sensors are used as standard.
• Sealing chamber monitoring – The motor has an internal moisture probe to detect water in the sealing chamber.
• Thermal motor bearing monitoring – The thermal motor bearing monitoring protects the motor bearings from overheating. Pt100 sensors are used as standard.

Sealing

The sealing of the motor compartment against the fluid is realized by two independent mechanical shaft seals. The sealing chamber between the mechanical shaft seals is filled with medical white oil.

• Submersible sewage pump with 12 m connection cable
• Installation and operating instructions

• Special voltages and 60 Hz on request
• Winding monitoring with Pt100 sensor
• Customized cable length
• VFD operation on request

• Suspension unit
• Chains
• Fixation sets
• Switchgear and relays

Operation with non-immersed motor

Surface-cooled motors are not suitable for non-immersed operation. In the case of fluctuating fluid levels, the system should shut down automatically as soon as the minimum water submersion is reached.

Horizontal installation

Horizontal installation is not possible!