Wilo-EMU 10" ... 24"

Series description

Special features/product advantages

  • Energy-efficient hydraulic systems via customizable hydraulics at the desired duty point
  • Drinking water version with ACS approval
  • Motors with sheath current cooling (CoolAct technology) for high power densities
  • Easy maintenance, rewindable motors
  • Optional Ceram CT coating for increasing efficiency

Design type

Multistage 10...24” submersible pump in sectional construction for vertical and horizontal installation

Application

  • For drinking water supply / general water supply from boreholes and rainwater storage tanks
  • Process water supply
  • Municipal water supply
  • Sprinkling and irrigation
  • Pressure boosting
  • Pumping water in industrial applications and for water control
  • Utilisation of geothermal energy
  • Utilisation in offshore areas

Equipment/function

  • Multistage submersible-motor pump with radial or semi-axial impellers
  • Hydraulics and motor freely configurable according to power requirements
  • Non-return valve can be integrated (depending on type)
  • Three-phase motor for direct or star-delta starting
  • Hermetically cast motors
  • Rewindable motors

Scope of delivery

  • Hydraulics + motor fully assembled
  • Connecting cable approved for drinking water, cable cross-section and length per standard design or per customer request
  • Installation and operating instructions

Type key

Example:

Wilo-EMU NK 63-17 + NU 611-2/15

Hydraulics:

NK 63-17

NK

Hydraulics

6

Diameter of the hydraulic unit in inches ["]

3

Size

17

Number of hydraulic stages

Motor:

NU 611-2/15

NU

Submersible motor

611

Size (4… = 4", 5…, 611 = 6")

2

Number of poles

15

nominal power

Technical data

  • Mains connection: 3~400 V, 50 Hz
  • Immersed operating mode: S1
  • Max. fluid temperature (higher temperatures on request):
    • NU 5... / NU 6… / NU 7… / NU 811 = 30 °C
    • NU 801 / NU 9... / NU 12.. / NU 16… / U… = 20 °C
  • Minimum motor flow:
    • NU 5... / NU 7... = 0.16 m/s
    • NU 611 = 0.1 - 0.5 m/s
    • NU 811 = 0.5 m/s
    • NU 801 / NU 9... / NU 12… / NU 16… / U... = 0.1 m/s
  • Max. sand content: 35 g/m3
  • Max. number of starts: 10/h
  • Max. immersion depth:
    • NU 5…, NU 7…= 350 m
    • NU 611, NU 811 = 100 m
    • Remaining motors = 300 m
  • Protection class: IP 68
  • Control range for frequency converter:
    • NU 5... / NU 6… / NU 7… / NU 811 / U 21… = 30-50 Hz
    • NU 801 / NU 911 / NU 12… / NU 16… (2-pole) = 25-50 Hz
    • NU 801 / NU 911 / NU 12… / NU 16… (4-pole) = 30-50 Hz

Description/construction

Submersible-motor pump for vertical or horizontal installation.

Hydraulics

Multistage submersible-motor pump with radial – semi-axial hydraulics. Housing parts made of EN-GJL or EN-GJS with 2K coating or G-CuSn10, impellers made of G-CuSn10 or NiAl-Bz.

Pressure port as threaded connection (up to K 12...) or as flange connection. A non-return valve can be installed instead of the pressure port on types K 12..., K 14…. For the remaining types, a non-return valve can be mounted directly on the pressure outlet.

Motor

Three-phase motor for direct and star-delta starting 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…, NU 9…, NU 12…, NU 16…, U…).

Standardised pump connection. Sealing of the motor shaft is achieved through the use of a mechanical seal (NU… series) made of solid silicon carbide material or through the use of rotary shaft seals (U… series). Self-lubricating motor bearing. Thrust bearing with rockers for absorption of high axial thrust. Negative axial thrust is absorbed by the counter-thrust bearing.

Motors in the NU 5…-, NU 7...-, NU 801, NU 9…, NU 12… and NU 16… series are filled with a water-glycol mixture, motors in the NU 611 and NU 811 series are filled with a water-glycerine mixture. NU 611-, NU 8…-, NU 9…-, NU 12… and NU 16… series motors can also be filled with drinking water (T version). U… series motors generally have to be filled with drinking water. Frequency converter operation is permitted (SF 1.1).

Cooling

The motor is cooled by the fluid. The motor must always be operated in submerged state. The limit values for the max. fluid temperature and the minimum flow rate must not be exceeded. Vertical installation is possible optionally with or without cooling jacket. For horizontal installation, bearing brackets must be used for reinforcement of the unit. An anti-vortex plate or cooling jacket may be used to improve the inlet flow.

Pressure shroud

The pressure shroud is used for direct installation of the unit in the pipe network. Standard models are without mounted non-return valves. The maximum inlet pressure is 10 bar or 5 bar, starting from a pressure shroud diameter of 559 mm.

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