OEM Multistage Submersible Borehole Pump Wilo-Sub TWI 4

Multistage 4" submersible pump in tie strap version for vertical or horizontal installation

Designed for pumping drinking water (in accordance with ACS and RI.SE), rainwater and process water with up to 50 g/m³ sand content from wells and rainwater storage tanks for the following applications:

• Irrigation
• Sprinkling
• Water supply
• Pressure boosting
• Ground water drainage and lowering

• Integrated non-return valve
• Discharge port according to NEMA
• Single-phase current motor with capacitor box with thermal motor protection

• Mains connection: 1~230 V, 50 Hz or 3~400 V, 50 Hz
• Submerged operating mode: S1
• Fluid temperature: 3 – 30 °C
• Minimum flow rate at motor: 0.1 m/s
• Max. sand content: 50 g/m3
• Max. number of starts: 20/h
• Max. immersion depth: 150 m
• Protection class: IP68
• Discharge port: Rp 1¼ – Rp 2

• Hydraulics housing: 1.4301 (AISI 304)
• Impellers: 1.4301 (AISI 304)
• Hydraulic shaft: 1.4057 (AISI 431)
• Motor housing: 1.4301 (AISI 304)
• Motor shaft: 1.4305 (AISI 303)

Submersible pump for vertical or horizontal installation.

Hydraulics

Tie strap version of the multistage submersible pump with radial or semi-axial impellers, integrated non-return valve, and a standardised 4" NEMA connection. Discharge port with threaded flange and female thread. All parts that come in contact with the fluid are made of corrosion-free materials.

Motor

Single-phase or three-phase current motor for direct starting. Sealed motor with lacquer-insulated, resin-covered winding, water-glycol filling and self-lubricating motor bearings.

Cooling

• The motor is cooled by the pumped fluid. Always operate the pump in a submerged state.
• Vertical installation is possible with or without cooling jacket.
• Horizontal installation must be performed in conjunction with a cooling jacket.

• Hydraulics + motor completely assembled
• 1.5 m or 2.5 m connection cable with drinking water approval
• AC version including switchbox with capacitor and on/off switch
• Installation and operating instructions

• Hydraulics in 1.4401 (AISI 316)
• Motor in 1.4401 (AISI 316)
• Pressure shroud version for the direct installation of the pump in the pipe system (max. inlet pressure: 10 bar)
• Custom-made

• Cooling shroud
• Diaphragm expansion tank
• Gate valve
• Float switch
• Pressure switch
• Electrode
• Switchgear
• Alarm switchgear
• Casting resin kit
• Connection cable