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Grundfos - NKG 50-32Grundfos - NKG 50-32Grundfos - NKG 50-32
Grundfos - NKG 50-32Grundfos - NKG 50-32

Grundfos : NKG 50-32-160.1/177 A1F2BE-SBQQE

Product No.: 96890215

Non-self-priming, single-stage, centrifugal pump designed according to ISO 5199 with dimensions and rated
performance according to ISO 2858. Flanges are PN 16 with dimensions according to EN 1092-2. The pump has an
axial suction port, a radial discharge port and horizontal shaft. It is of the back pull-out design enabling removal of the
motor, coupling, bearing bracket and impeller without disturbing the pump housing or pipework.
The pump is fitted with a foot-mounted, fan-cooled asynchronous motor. Pump and motor are mounted on a common
base frame.
The product’s minimum efficiency index (MEI) is greater or equal to 0.70. This is by the Commission Regulation (EU)
considered as an indicative benchmark for best-performing water pump available on the market as from 1 January
2013.
Pump and motor are mounted on a common steel base frame in accordance with ISO 3661. The back pull-out design
makes it possible to make service on the pump when the pump housing is still connected to the inlet and discharge
pipes.
. 1) Remove the bolts in the bearing bracket support foot and motor foot.
. 2) Remove the bearing bracket and the motor from the pump housing.

Grundfos - NKG 50-32

Cast-iron parts have an epoxy-based coating made in a cathodic electro-deposition (CED) process. CED is a high-quality dip-painting process where an electrical field around the products ensures deposition of paint particles as a thin, well-controlled layer on the surface.

Pump
The pump housing has both a priming and a drain hole closed by plugs. The impeller is a closed impeller with
double-curved blades with smooth surfaces. The impeller is statically balanced according to ISO 1940-1 class G6.3
and hydraulically balanced to compensate for axial thrust.

Wear rings used in pump housing and for impeller are made of bronze/brass.
The shaft is made of stainless steel and has a diameter of 24 mm where the coupling is mounted.
The pump uses a standard coupling between the pump and motor shaft.

Grundfos - NKG 50-32

 

Motor
The motor is a totally enclosed, fan-cooled motor with principal dimensions to IEC and DIN standards and mounting
designation B3 (IM 1001). Electrical tolerances comply with IEC 60034.
The motor efficiency is classified as IE3 in accordance with IEC 60034-30-1.
The motor has thermistors (PTC sensors) in the windings in accordance with DIN 44081/DIN 44082. The protection
reacts to both slow- and quick-rising temperatures, e.g. constant overload and stalled conditions.
Thermal switches must be connected to an external control circuit in a way which ensures that the automatic reset
cannot cause accidents. The motors must be connected to a motor-protective circuit breaker according to local
regulations.

The motor can be connected to a variable speed drive for adjustment of pump performance to any duty point.
Grundfos CUE offers a range of variable speed drives. Please find more information in Grundfos Product Center.

Technical data
Controls
Frequency converterNONE
Pressure sensorN
Liquid
Liquid temperature range-25 .. 120 °C
Selected liquid temperature20 °C
Density998.2 kg/m³
Technical
Pump speed on which pump data are based2875 rpm
Rated flow22.31 m³/h
Pump with motorY
Rated head33.52 m
Actual impeller diameter177 mm
Nominal impeller diameter160.1
Code for shaft sealBQQE
Curve toleranceISO9906:2012 3B2
Bearing designStandard
Materials
Pump housingCast iron
EN-GJL-250
ASTM class 35
Wear ringBrass
Impeller Brass
CuZn37Pb
ShaftStainless steel
EN 1.4301
AISI 304
Internal pump house coatingCED
Installation
Maximum ambient temperature40 °C
Maximum operating pressure16 bar
Pipe connection standardEN 1092-2
Type of inlet connectionDIN
Type of outlet connectionDIN
Size of inlet connectionDN 50
Size of outlet connectionDN 32
Pressure rating for connectionPN 16
Coupling typeFlexible w/o spacer
Base frame designC-channel
GroutingN
Electrical data
Motor type112M
IE Efficiency classIE3
Rated power – P24 kW
Mains frequency50 Hz
Rated voltage3 x 380-420D/660Y V
Rated current7,6-6,9/4,4 A
Starting current958-958 %
Cos phi – power factor0.91
Rated speed2875 rpm
EfficiencyIE3 88,1%
Motor efficiency at full load88.1-88.1 %
Motor efficiency at 3/4 load89.0-89.0 %
Motor efficiency at 1/2 load88.9-88.9 %
Number of poles2
Enclosure class (IEC 34-5)55 (Protect. water jets/dust)
Enclosure class (IEC 85)F
Motor No99489915
Other
Minimum efficiency index, MEI ≥0.70
Net weight138 kg
Gross weight178 kg
Shipping volume0.674 m³
Country of originSG
Custom tariff no84137011

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