Design
Wilo Emu 6″ Submersible pump in sectional construction
Description/design
Submersible-motor pump for vertical or horizontal installation.
Hydraulics
Multistage submersible-motor pump with radial hydraulics. Housing parts made of NiAl‐Bz, impellers made of Noryl. Pressure connection as threaded connection, with integrated non-return valve.
Motor
Three-phase motor for direct and star-delta start Sealed, hermetically cast motor with enamel-insulated winding, resin-impregnated (NU 4…, NU 5…) or rewindable motor with PVC‐insulated winding (NU 611). Motor shroud made of stainless steel, A2/A4 quality.
Pump connection as standard NEMA connection. Sealing of motor shaft achieved through the use of a rotary shaft seal (NU 4…) or mechanical seal made of solid silicon carbide material.
Self-lubricating motor bearing. Motors in the NU 4…- and NU 5… series are filled with a water‐glycol mixture, motors in the NU 611 series are filled with a water-glycerine mixture. Alternatively, NU 611… series motors can be filled with potable water (T‐version). 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. A 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 system. Standard models are without mounted non-return valves. The maximum inlet pressure is 10 bar.
Application
For potable water supply / general water supply from boreholes and rainwater storage- Process water supply
- Municipal water supply
- Sprinkling and irrigation
- Pressure boosting
- Pumping water in industrial applications and water control
- Operation of fountains
- For pumping water without long-fibre and abrasive constituents
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 |
Special features/product advantages
Pumping water from great depths- Corrosion-free and wear-resistant due to housing made of NiAl‐Bz and impellers made of Noryl
- Integrated non-return valve
- Cast and rewindable motors
- Vertical and horizontal installation possible (depending on the number of stages)
Technical data
- Mains connection: 3~400 V, 50 Hz
- Immersed operating mode: S1
- Max. fluid temperature: 30 °C, higher temperatures on request
- Minimum motor flow:
- NU 4… = 0.1 m/s
- NU 5… = 0.16 m/s
- NU 6… = 0.1 ‐ 0.5 m/s
- Max. sand content: 35 g/m3
- Max. number of starts: 20/h
- Max. immersion depth:
- NU 4…, NU 5…= 350 m
- NU 611 = 100 m
- MEI classification:
- NK 62 = >0.4
- NK 63 = >0.7
- NK 64 = >0.1
- Protection class: IP 68
- Control range for frequency converter: 30-50 Hz
Equipment/function
- Multistage submersible-motor pump with radial impellers
- Hydraulics and motor freely configurable according to power requirements
- Integrated non-return valve
- NEMA coupling
- Three-phase motor for direct or star-delta starting
- Hermetically cast motors
- Rewindable motors
