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Grundfos - NKG 65-50Grundfos - NKG 65-50Grundfos - NKG 65-50Grundfos - NKG 65-50Grundfos - NKG 65-50

Grundfos : NKG 65-50-160/177A1F2BE-SBQQE

Product No.: 99532020   

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 65-50

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 65-50

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 converter NONE
Pressure sensor N
Liquid
Liquid temperature range -25 .. 120 °C
Selected liquid temperature 20 °C
Density 998.2 kg/m³
Technical
Pump speed on which pump data are based 2935 rpm
Rated flow 50.4 m³/h
Pump with motor Y
Rated head 39.03 m
Actual impeller diameter 177 mm
Nominal impeller diameter 160
Code for shaft seal BQQE
Curve tolerance ISO9906:2012 3B
Bearing design  Standard
Materials
Pump housing Cast iron
EN-GJL-250
ASTM class 35
Wear ring Brass
Impeller  Brass
CuZn37Pb
Shaft Stainless steel
EN 1.4301
Internal pump house coating CED
Installation
Maximum ambient temperature 40 °C
Maximum operating pressure 16 bar
Pipe connection standard EN 1092-2
Type of inlet connection DIN
Type of outlet connection DIN
Size of inlet connection DN 65
Size of outlet connection DN 50
Pressure rating for connection PN 16
Coupling type Flexible w/o spacer
Base frame design C-channel
Grouting N
Electrical data
Motor type 160M
IE Efficiency class IE3
Rated power – P2 11 kW
Mains frequency 50 Hz
Rated voltage 3 x 380-420D/660Y V
Rated current 20,4-18,4/11,7 A
Starting current 775-775 %
Cos phi – power factor 0.90
Rated speed 2935 rpm
Efficiency IE3 91,2%
Motor efficiency at full load 91.2-91.2 %
Motor efficiency at 3/4 load 92.0-92.0 %
Motor efficiency at 1/2 load 92.0-92.0 %
Number of poles 2
Enclosure class (IEC 34-5) 55 (Protect. water jets/dust)
Enclosure class (IEC 85) F
Motor No 99489918
Other
Minimum efficiency index, MEI ≥ 0.70
Net weight 226 kg
Gross weight 266 kg
Gross weight 266 kg
Shipping volume 0.674 m³
Country of origin SG
Custom tariff no 84137011

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