Wilo Sub TWI 8

Design

Submersible-motor pump, multistage

Type key

Type key, standard version:

e.g.         Wilo-Sub TWI 8.80-02-B-SD-R

TWI        Submersible pump

8            Diameter of the hydraulic unit in inches ["]

80          Nominal volume flow [m3/h]

02          Number of hydraulic stages

B            Series generation

SD          Starting mode

Without = direct starting

SD = star-delta starting

R            Motor with rewindable stator, without = motor with hermetically cast stator

Type key, configurable version

Example, hydraulics:

e.g.         Wilo-Sub TWI 08.90-19-NB

TWI        Hydraulics

0            Configurable series

8            Diameter of the hydraulic unit in inches ["]

90          Nominal volume flow [m3/h]

19          Number of hydraulic stages

N            Impeller diameter N = standard

S = trimmed

B            Series generation

Example, motor:

e.g.         Wilo-EMU NU 811-2/90

NU         Submersible motor

811        Overall size

2            Number of poles

90          Package length

Application

·   For water and potable water supply from boreholes and rainwater

·   storage

·   Process water supply

·   For municipal water supply, sprinkling and irrigation

·   Pressure boosting

·   Lowering the water level

·   For pumping water in industrial applications

·   For pumping water without long-fibre and abrasive constituents

Special features/product benefits

·   Simple maintenance due to rapid installation and dismantling

·   Integrated non-return valve

·   Vertical and horizontal (stage-dependent) installation possible

·   Standard and configurable versions available

·   Star-delta starting

·   Motor with rewindable stator

Technical data

·   Mains connection: 3~400 V, 50 Hz

·   Immersed operating mode: S1

·   Fluid temperature:

-    Motors with hermetically cast stator: 3-30 °C

-    Motors with rewindable stator: 3-30 °C (depending on type)

·   Minimum motor flow: 0.1-0.5 m/s (depending on type)

·   Max. sand content: 50 g/m3

·   Max. number of starts: 10/h

·   Max. submersion depth:

-    6" motors with rewindable stator: 100 m

-    6" motors with hermetically cast stator: 300 m

-    8" motors with rewindable stator: 300 m

·   Protection class: IP 68

·   Pressure port: Rp 5

Equipment/function

·  Multistage submersible-motor pump with semi-axial impellers

·  Integrated non-return valve

·  NEMA coupling

·  Three-phase AC motor

·  Motor with hermetically cast stator (NU 5..., NU 7...)

·  Motor with rewindable stator (NU 6..., NU 8... and SD-R motor)

Materials

·   Hydraulic housing: 1.4301 stainless steel

·   Impellers: 1.4301 stainless steel

·   Hydraulics shaft: 1.4057 stainless steel

·   Motor housing: EN-GJL stainless steel

·   Motor shaft: 1.4305 stainless steel

Description/design

Submersible-motor pump for vertical or horizontal installation.

Hydraulics

Multistage submersible-motor pump with 6" or 8" NEMA connection and semi-axial impellers with sectional construction. Integrated non- return valve. All parts in contact with the fluid are made of corrosion- free materials.

Motor

Corrosion-free three-phase AC motor for direct or star-delta starting. Sealed, hermetically cast stator, resin-impregnated, with enamel-insulated winding or rewindable stator with PVC-insulated winding, self-lubricating bearing, with water-glycol filling.

Cooling

The motor is cooled by the fluid. The motor must always be immersed when operated. The limit values for maximum fluid temperature and minimum flow velocity must be adhered to. Vertical installation is possible with or without cooling jacket. Cooling jacket is required for horizontal installation.