Wilo-Zetos K8

Product Overview

Design: Multistage 8" stainless steel cast submersible pump in sectional construction for vertical and horizontal installation.

Type Key Explanation

Example: Wilo-Zetos K8.130–17 + NU 701–2/130

• Hydraulics: K8.130–17
  • K: Series
  • 8: Diameter of the hydraulic unit in inches ["]
  • 130: Volume flow in the best point at 50 Hz in m³/h
  • 17: Number of hydraulic stages
• Motor: NU 701–2/130
  • NU: Submersible motor
  • 701: Size (e.g., 6" or 8")
  • 2: Number of poles
  • 130: Nominal motor power in kW

Special Features/Product Advantages

• High efficiency: Operation-dependent hydraulic efficiencies of up to 84.5%.
• High corrosion resistance: Hydraulics comprised entirely of stainless steel cast.
• High wear resistance: Max. sand content of 150 g/m³, optionally with ceramic CT-coating.
• Suitable for pumping drinking water: Version with ACS rating available.
• Easy maintenance: Simple system for installation and dismantling of hydraulics.

Application

• Process water and water supply from boreholes and rainwater storage tanks in communal and industrial applications.
• Pumping drinking water with ACS approval.
• Pumping water for sprinkling and irrigation.
• Ground water lowering.
• Pressure boosting.
• Pumping water in offshore areas and in fire extinguishing systems.
• Utilisation in geothermal and thermal applications.
• Water control in mines and mining applications.

Technical Data

Hydraulics

• Max. volume flow: 200 m³/h
• Max. delivery head: 620 m
• Max. fluid temperature: 70 °C
• Max. sand content: 150 g/m³
• Pressure connection: G 5/PN 63

Motor

• Mains connection: 3~400 V, 50 Hz ±10%
• Max. fluid temperature: 30 °C at 0.16 or 0.5 m/s minimum flow; 20 °C at 0.1 m/s minimum flow; higher temperatures on request.
• Immersed operating mode: S1
• Max. number of starts: NU 5... / NU 6... / NU 7... = 20/h; NU 8.. = 10/h

Equipment/Function

• Multistage hydraulics with semi-axial impellers.
• Integrated non-return valve.
• NEMA coupling.
• Three-phase AC motor.

Description/Design

Submersible pump for vertical or horizontal installation.

Hydraulics Details

Multistage submersible-motor pump with semi-axial hydraulics. Housing parts and impellers made of stainless steel (1.4408). Pressure connection as threaded connection with non-return valve (optionally with accessory adapter on flange connection).

Motor Details

Three-phase motor for direct and star-delta start. Sealed, hermetically cast motor with enamel-insulated winding, resin-impregnated (NU 5..., NU 7...) or rewindable motor with PVC-insulated winding (NU 611..., NU 8...). Motor shroud made of stainless steel, A2/A4 quality. Hydraulic connection as standard NEMA connection. Sealing of motor shaft by mechanical seal made of solid silicon carbide material. Self-lubricating motor bearing. Thrust bearing with rockers for absorption of high axial thrust. Negative axial thrust absorbed by counter-thrust bearing. Motors in NU 5... and NU 7... series filled with water-glycol mixture; NU 611 and NU 811 series filled with water-glycerine mixture. NU 611 and NU 8... series motors can also be filled with drinking water (T-version). Frequency converter operation permitted (SF 1.1).

Cooling

Motor cooled by pumped fluid. Must always be immersed when operated. Adhere to limit values for maximum fluid temperature and minimum flow velocity. Vertical installation possible with or without cooling jacket. For horizontal installation, bearing brackets are required. Anti-vortex plate or cooling jacket may be used to improve inlet flow.

Pressure Shroud

Used for direct installation in the pipe network. Standard models are without mounted non-return valves. Max. inlet pressure is 10 bar.

Options

• Individual hydraulics without motor available.
• Drinking water version with ACS approval.
• PT100 sensor for thermal motor monitoring.
• Adapter for flange connection.
• Ceram CT coating for enhanced hydraulic efficiency.

Scope of Delivery

• Unit (hydraulics system + motor) premounted at the factory.
• Connection cable per customer request.
• Installation and operating instructions.

Accessories

• Cooling shrouds.
• Pressure shroud.
• Bearing brackets and anti-vortex plate.
• Transitions.
• Switchgears.
• Plastic cable connector set.

Configuration

• No suction mode possible.
• Unit must be fully immersed during operation.
• Horizontal installation possible depending on motor.
• Drinking water version: components in contact with fluid must be checked for use; ACS rating version optionally available.

Max. Immersion Depth

NU 5... NU 7... = 350 m; NU 611, NU 811 = 100 m; NU 801 = 300 m.

Protection Class

IP 68.

Control Range for Frequency Converter

NU 5.../NU 611/NU 7.../NU 811 = 30-50 Hz; NU 801 = 25-50 Hz.

Performance Data

Performance Curves: Detailed performance curves are provided, illustrating the relationship between Head (H) in meters and Flow Rate (Q) in m³/h for various Wilo-Zetos K8 models (e.g., K8.50 series, K8.70 series, K8.130 series). These charts also include curves for efficiency (η/%) and Net Positive Suction Head (NPSH/m).

Duty Chart: A duty chart graphically represents the operating ranges for different pump models.

Materials

Motor Materials

Pump Materials (K8 Series)

Model Specifications, Dimensions, and Ordering

Detailed tables provide specifications for various Wilo-Zetos K8 models, including motor data, dimensions, weights, and ordering information for accessories.

Motor Data (Examples)

Dimensions and Weights (Examples)

Ordering Information: Accessories

Bearing Brackets and Anti-Vortex Plate

Cooling Jacket Pipes

Flange Dimensions

Company Information

WILO SE
Nortkirchenstraße 100
D-44263 Dortmund
Germany

T: +49 231 4102-0

F: +49 231 4102-7363

Email: wilo@wilo.com

Website: www.wilo.com