NB - NBE - NK - NKE

Summary

Product identification

The GRUNDFOS NB, NBE, NK, NKE are single-stage end-suction pumps designed according to EN 733, operating at 50 Hz. All pumps conform to ISO 5199.

• NB pumps are close-coupled with a totally enclosed fan-cooled standard motor, with main dimensions to IEC and DIN standards.
• NK pumps are long-coupled with a totally enclosed fan-cooled standard motor, with main dimensions to IEC and DIN standards and mounting designation B3 (IM 1001).
• NBE and NKE pumps are electronically speed-controlled versions of NB and NK, equipped with a motor with a built-in frequency converter and application software.
• ATEX-approved pumps (in accordance with Directive 94/9/EC, group II, category 2G/D and 3G/D) are available upon request.

Applications

These are multipurpose pumps suitable for a variety of applications demanding reliable and cost-efficient supply, including:

• Water supply: Filtration and transfer at waterworks, pressure boosting in mains, high-rise buildings, hotels, industrial buildings, and various swimming bath applications.
• Industrial pressure boosting: Industrial washing and cleaning systems, industrial wash-down systems, vehicle washing tunnels, and fire-fighting systems.
• Industrial liquid transfer: Cooling and air-conditioning systems (refrigerants), boiler-feed and condensate systems, aquafarming, industrial heating systems, and district heating plants.
• HVAC: Heating systems, ventilation systems, and air-conditioning systems.
• Irrigation: Field irrigation (flooding), sprinkler irrigation, and drip-feed irrigation.

Operating limits

• Flow rates: From 2 to 1300 m³/h
• Heads: From 2 to 160 m
• Pressure rating: Dimensions and rated performance are according to EN 733 (10 bar). Pumps with flange dimensions up to and including DN 150 are marked PN 16 and are suitable for 16 bar operation.
• Performance Range (50 Hz):
  • 2-pole models (NB, NK): Flow rates up to approximately 1400 m³/h, heads up to approximately 200 m.
  • 4-pole models (NB, NK): Flow rates up to approximately 1400 m³/h, heads up to approximately 120 m.
  • 6-pole models (NB, NK): Flow rates up to approximately 1000 m³/h, heads up to approximately 60 m.
• Liquid temperatures, ambient temperature and altitude, sound pressure level: Specific values for these parameters are not provided in the extracted text, but sections for them are listed in the table of contents.

Electrical

• Frequency: 50 Hz
• Motor Poles: NB and NK pumps are available with 2-, 4-, and 6-pole motors. NBE and NKE pumps are available with 2- and 4-pole motors.
• Efficiency Classes: NB and NK pumps are available with IE1, IE2, and IE3 efficiency class motors.
• Voltage: Motors with power rating up to and including 4 kW are available for "low voltage"; motors from 2.2 kW are available for "high voltage".
• Speed Control:
  • Some pumps can be equipped with an MGE motor (with integrated frequency converter).
  • Some pumps can be connected to a Grundfos CUE external frequency converter.
  • All pumps with non-E-motor can be connected to an external frequency converter.
  • NBE and NKE pumps enable electronic speed control for constant pressure, temperature control, or constant flow.
• Electrical data for IE1, IE2, IE3, and MGE motors: Specific values are not provided in the extracted text, but sections for them are listed in the table of contents.

Mechanical / hydraulic

• Pump Type: Non-self-priming, single-stage, centrifugal volute pumps with axial suction port, radial discharge port, and horizontal shaft.
• Design: Back pull-out design allows removal of the motor, motor stool, and impeller without disturbing the pump housing or pipework.
• Flanges:
  • Suction and discharge flanges are according to EN 1092-2.
  • Pump housings have discharge flanges from DN 32 to DN 250.
  • Some stainless steel pump sizes have loose flanges; all other have fixed flanges.
• Shaft Seal: Mechanical shaft seal dimensions are according to EN 12756.
  • Shaft seal diameters (d5) range from 24 mm to 60 mm, depending on the pump type and power.
  • Options include double seal arrangement and cartridge seal (single/double).
• Impellers: Hydraulically balanced. All pumps are statically balanced according to ISO 1940-1 class 6.3.
• Mounting:
  • NB pumps are available in mounting design A, B, C (C with base frame as an accessory), and F (F with base frame).
  • The NK pump and motor are mounted on a common steel base frame in accordance with EN 23661.
  • For most NB pumps, a Grundfos-designed base frame is available.
  • Support blocks or support rails may be needed to level height differences between pump and motor, or due to motor flange size.
• Material: Available in Cast Iron and Stainless Steel versions.

Product Range Details

Detailed product range tables provide specific configurations for NB, NBE, NK, and NKE pumps, including power ratings (P2 [kW]), E-solution compatibility (MGE/CUE), shaft seal diameters, mounting designs, material codes, and flange ratings/standards (PN 10, PN 16, DIN, ANSI, JIS).

See the official PDF for exact tabulated values.

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Disclaimer: This summary is based solely on the extracted text provided. It may not include all figures, footnotes, or the latest revisions present in the official OEM PDF datasheet. Contractual data must always match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

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