Well & waterworks version, material design “A”
For use in cold, clean, chemically non-aggressive water with a max. sand content of 35 mg/l and max. particle size of 2 mm.
HYDRAULICS
Single or multistage radial/semi-axial/axial submersible pump in waterworks version for vertical/horizontal installation in staged construction.
All housing components in high-quality cast iron design.
Shaft and connection elements are made of high-alloy stainless steel.
Impellers are of the solid-metal design with replaceable neck rings made of wear-resistant materials.
Duty point adjustment possible by impeller optimisation.
Shaft guidance through metal or rubber plain bearing.
Radial bearings completely fluid lubricated and maintenance-free.
Submersible pump: D 500
Type of impeller: Semi axial impeller
Number of stages: 1 – 4
Max. impeller diameter: 308 mm
Min. impeller diameter 256 mm
Max. pumped water temperature: 20 °C
(higher temperature on request)
With/without non-return valve: without non-return valve
Unit diameter: 18″ (Ø432 – Ø470)
(exact diameter on request)
Selected number of stages: 3
MOTOR
“NEMA Standard” submersible motor in glandless pump technology.
In three-phase current version with rewindable stator.
Motor stator, shaft ends and connectors made of stainless steel.
Motor end parts in solid cast-iron design.
Radial bearing through water-lubricated and -cooled plain bearing made of special artificial carbon, with incorporated spiral or longitudinal grooves.
Mitchell-type tilting pad axial bearing for high loads.
Support plates and tilting pads made of stainless steel, impeller wear ring made of artificial carbon.
With integrated rotating seal ring for negative axial thrust made of artificial carbon.
Motor filling with pure potable water or water/propylene glycol
Optionally available with winding temperature monitoring by PTC thermistor or PT 100 sensor.
MOTOR DATA
Selected motor: NU 121-4/90-127
Rated power: 127 kW
Power consumption of the motor at rated power: 145.0 kW
Current consumption of the motor at rated power: 261.6 A
Number of poles: 4
Rated speed: 1,447 1/min
Cos phi at rated power: 0.8
Efficiency of the motor at rated power: 87.6 %
Rated frequency: 50 Hz
Starting current for direct starting: 1,380.0 A
Starting current for star-delta starting: 460.0 A
Starting torque: 1,200.0 Nm
Moment of inertia: 0.5131 kg m²
Maximum switching frequency per hour: 10
Switching break: 5 minutes
Permissible axial thrust downward: 35,000 N
Permissible axial thrust upward: 10,000 N
Motor filling volume: 29 l
Possible installation type: Horizontal and vertical
Maximum pumped water temperature 30 °C
(higher temperature on request)
DUTY POINT DATA
Volume flow:
Delivery head:
Pump efficiency at duty point: %
Power consumption of the motor at duty point (P1):
NPSH value of the pump at duty point:
Impeller diameter: 308.0 mm
MATERIALS
Suction piece: EN-GJL 250
Stage- /guide casing: EN-GJL-250
Impeller: G-CuAl10Ni
Stationary wear ring: 1.4580
Pump shaft: 1.4021
Shaft sleeve: 1.4021
Pump end bearing: Brass + NBR
Connecting screws: A 2 – 70
Nuts: A 2 – 70
Weight of the unit: 1,000.0 kg
