Wilo-Sub TWU 4-...-GT

Design

Multistage 4" submersible pump in jacketed construction for vertical and horizontal installation

Application

• Geothermal applications
• For water supply from boreholes and rainwater storage tanks
• For domestic water supply, sprinkling and irrigation
• Pressure boosting
• Lowering the water level
• For pumping water without long-fibre and abrasive constituents

Type key

Equipment/function

• Multi-stage submersible pump with radial or semi-axial impellers
• Hermetically cast motors
• Integrated non-return valve
• NEMA coupling
• Three-phase motor

Technical data

• Minimum Efficiency Index (MEI) ≥ 0.7

• Mains connection: 3~400 V, 50 Hz,
• Submerged operating mode: S1
• Fluid temperature: 3‐30 °C
• Minimum flow rate at motor: 0.08 m/s
• Max. sand content: 50 g/m³
• Max. number of starts: 20/h
• Max. submersion depth: 200 m
• Protection class: IP 68
• Pressure connection: Rp 1¼

Materials

• Hydraulic housing: Stainless steel 1.4301
• Impellers: Noryl
• Hydraulics shaft: Stainless steel 1.4104
• Motor housing: Stainless steel 1.4301
• Motor shaft: Stainless steel 1.4305

Description/design

Submersible pump for vertical or horizontal installation.

Hydraulics

Multi-stage submersible pump with radial or semi-axial impellers in sectional construction. Integrated non-return valve. All parts in contact with the fluid are made of corrosion-free materials.

Motor

Corrosion-free three-phase motor for direct starting. Sealed and hermetically cast motor with enamel-insulated winding, resin-impregnated, self-lubricating bearing, with water-glycol filling.

Cooling

The motor is cooled by the fluid. The motor must always be operated in submerged state. The limit values for the maximum fluid temperature and the minimum flow rate must not be exceeded. Vertical installation is possible optionally with or without cooling jacket. Cooling jacket is required for horizontal installation.

Configuration

• No suction mode is possible with these units!
• The unit must be fully immersed in water during operation.

Scope of delivery

• Hydraulics and motor ready assembled
• Connection cable with potable water approval (TWU 4-…-GT with 15 m cable; TWU 4-…-GT-QC with short cable and plug for rapid replacement)
• Installation and operating instructions

Options

• Motor versions for special voltages 3~380 V, 60 Hz; 3~460 V, 60 Hz

General notes - ErP (ecological design-) directive

The benchmark for most efficient water pumps is MEI ≥ 0.70The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable speed drive that matches the pump duty to the system.Information on benchmark efficiency is available at www.europump.org/efficiencycharts