Wilo-Sub TWI 8

Your advantages

• Long service life thanks to corrosion-resistant stainless steel, optionally available in V4A quality
• Individually configurable motors and materials to ensure reliable operation in all applications
• Drinking water versions with ACS approval
• 4", 6", 8" and 10" versions for high flexibility
• Volume flow performance from 1 to 250 m³/h

Construction

Multistage 8" submersible pump in tie strap version for vertical or horizontal installation

Application

• For water and drinking water supply from boreholes and rainwater storage
• Process water supply
• For municipal water supply, sprinkling and irrigation
• Pressure boosting
• Lowering of the water level
• For pumping water in industrial applications
• For pumping water without long-fibre and abrasive constituents

Equipment/function

• Multistage submersible pump with semi-axial impellers
• Integrated non-return valve
• NEMA coupling
• Three-phase current motor
• Hermetically sealed motors
• Rewindable motors

Scope of delivery

• Hydraulics and motor ready assembled
• 4/8/10 m connection cable approved for drinking water (cross-section: 4x2.5 mm² or 4x4 mm² or single conductor)
• Installation and operating instructions

Type key

Technical data

• Mains connection: 3~400 V, 50 Hz
• Submerged operating mode: S1
• Fluid temperature:
• Hermetically cast motors: 3-20 °C or 3-30 °C (depending on type)
• Rewindable motors: 3-30 °C (depending on type)
• Minimum flow rate at motor: 0.1-0.5 m/s (depending on type)
• Max. sand content: 50 g/m³
• Max. number of starts: 10-20/h (depending on type)
• Max. immersion depth: 100 – 350 m (depends on type)
• Protection class: IP68
• Pressure connection: Rp 5

Materials

• Hydraulics housing: Stainless steel 1.4301
• Impellers: Stainless steel 1.4301
• Hydraulic shaft: Stainless steel 1.4057
• Motor housing: EN-GJL or stainless steel 1.4301
• Motor shaft: Stainless steel 1.4021, 1.4301 or 1.4305

Description/construction

Submersible pump with ACS approval for vertical or horizontal installation.

Hydraulics

Multistage submersible-motor pump with 6" or 8" NEMA connection and semi-axial impellers with sectional construction. Integrated non-return valve. All parts that come in contact with the fluid are made of corrosion-free materials.

Motor

Three-phase motor for direct or star-delta start. Sealed, hermetically cast motor, resin-impregnated, with enamel-insulated winding or rewindable motor with PVC-insulated winding, self-lubricating bearing, with water-glycol filling. NU 611, NU 8...-series motors can also be filled with drinking water (T version).

Cooling

The motor is cooled by the pumped fluid. The motor must always be immersed when operated. The limit values for maximum fluid temperature and minimum flow velocity must be adhered to. Vertical installation is possible with or without cooling jacket. Horizontal installation must be performed in conjunction with a cooling jacket.

Pressure shroud

The pressure shroud is used for the direct installation of the unit in the pipe system. Standard models are without mounted non-return valves. The maximum inlet pressure is 10 bar.