NB - NK

Summary

Product Identification

Grundfos NB and NK series single-stage end-suction pumps, designed according to EN 733 for 50 Hz operation. The product line also includes NBE and NKE models.

Performance Range

The performance range for NB and NK pumps (50 Hz) varies by pole configuration and material (Cast Iron or Stainless Steel).

• 2-pole models:
  • Flow (Q): From approximately 4 m³/h to 1400 m³/h
  • Head (H): From approximately 8 m to 200 m
• 4-pole models:
  • Flow (Q): From approximately 4 m³/h to 1400 m³/h
  • Head (H): From approximately 2 m to 120 m
• 6-pole models:
  • Flow (Q): From approximately 10 m³/h to 1000 m³/h
  • Head (H): From approximately 2 m to 60 m

See the official PDF for exact tabulated values and detailed performance curves for specific pump types.

Product Range Overview

The standard product range combines various pump and motor parameters.

Pump Specifications

• Discharge Flanges: Available from DN 32 to DN 250.
• Flange Type: Some stainless steel pump sizes feature loose flanges; all others have fixed flanges.
• NB Mounting Designs: Available in A, B, C (C with base frame as an accessory), and F (F with base frame).
• Support Blocks: Support blocks or rails may be required to level height differences between the pump and motor, or due to motor flange size.

Motor Specifications

• Frequency: Motors are designed for 50 Hz.
• Pole Configurations:
  • NB and NK pumps: Available with 2-, 4-, and 6-pole motors.
  • NBE and NKE pumps: Available with 2- and 4-pole motors.
• Efficiency Classes: NB and NK pumps are available with IE2 and IE3 motors; IE1 motors are available for some regions.
• Voltage Ratings:
  • Motors with power rating up to and including 4 kW are available for "low voltage."
  • Motors as from 2.2 kW are available for "high voltage."
• Integrated Frequency Converters: Some pumps can be equipped with an MGE motor (with integrated frequency converter).
• External Frequency Converters: 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.

Detailed Product Tables (Examples)

The extracted tables provide detailed specifications for various NB and NK pump types, categorized by pole configuration (2-pole, 4-pole, 6-pole) and material (Cast Iron, Stainless Steel). Each entry includes:

• Pump Type (e.g., 32-125.1, 150-315.1)
• P2 [kW] (Motor Power)
• E-solution (e.g., CUE, MGE, or none)
• Oversize shaft (Indicated by '-')
• Mounting design (e.g., A, B, C)
• Material code
• Options:
  • Double seal arrangement
  • Cartridge seal - single/double
  • Pump housing with feet
  • Pump with base frame
  • Stuffing box (Cast Iron versions only)
  • Standard bearing bracket
  • Heavy-duty bearing bracket
• Flange rating (PN 10, PN 16)
• Flange standard (DIN (code F), ANSI (code G), JIS (code J))
• d5 [mm] (Shaft seal diameter)

For example, a "32-125.1" NB pump (2-pole, 50 Hz, Cast Iron) might have a P2 of 0.75 kW, CUE E-solution, mounting design A, PN 10/PN 16 flange rating, DIN flange standard, and a shaft seal diameter of 24 or 28 mm.

See the official PDF for exact tabulated values for all available pump types and configurations.

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

Official datasheet (PDF)

Lenntech datasheet mirror