Details

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1. Applications

Introduction
NB and NK are multipurpose pumps suitable for a variety of different applications demanding reliable and cost[1]efficient supply. NB and NK pumps are used in five main fields of application:
• water supply
• industrial pressure boosting
• industrial liquid transfer
• HVAC
• irrigation.

Water supply
Besides general water supply in municipal and industrial waterworks, the NB and NK pumps are used for these specific applications:
• filtration and transfer at waterworks
• pressure boosting in mains
• pressure boosting in high-rise buildings, hotels, etc.
• pressure boosting in industrial buildings
• various swimming bath applications.

Industrial pressure boosting
Pressure boosting in these applications:
• industrial washing and cleaning systems
• industrial wash-down systems
• vehicle washing tunnels
• firefighting systems.

Industrial liquid transfer
Liquid transfer in these applications:
• cooling and air-conditioning systems, refrigerants
• boiler-feed and condensate systems
• aquafarming
• industrial heating systems
• district heating plants.

HVAC
Liquid transfer in these applications:
• heating systems
• ventilation systems
• air-conditioning systems.

Irrigation
Irrigation covers these applications:
• field irrigation, flooding
• sprinkler irrigation
• drip-feed irrigation
 

2. Features and benefits

NB and NK pumps offer the following features and benefits:
• The pumps are non-self-priming, single-stage, centrifugal volute pumps with axial inlet port, radial outlet port and horizontal shaft.
• All pumps are according to ISO 5199.
• Inlet and outlet flanges are according to EN 1092-2.
• Dimensions and rated performance are according to EN 733 (10 bar). However, pumps with flange dimensions up to and including DN 150 are marked PN 16 and thus suitable for 16 bar operation.
• The mechanical shaft seal has dimensions according to EN 12756.
• The pumps offer flow rates from 2 to 1300 m3/h and heads from 2 to 160 m.
• The pumps can be delivered as -E versions where they are combined with an MGE motor (with integrated frequency converter) or they are combined with a “back mounted” CUE frequency converter in combination with a standard motor. Both versions of the -E products are delivered as complete units with no wiring needed to a control room.
• All pumps are statically balanced according to ISO 1940-1 class 6.3. Impellers are hydraulically balanced.

NB pump
• For NB pumps the back pull-out design enables removal of the motor, motor stool and impeller without disturbing the pump housing or pipes. Even the largest pumps can thus be serviced by a single person with a crane.
• The NB pump is close-coupled with a totally enclosed fan-cooled standard motor with main dimensions to IEC and DIN standards.
• For most of the NB pumps, a Grundfos-designed base frame is available. For more information, see section NB base frames.

NK pump
• For NK pumps the back pull-out design enables removal of the motor, motor stool and impeller without disturbing the pump housing or pipes. Even the largest pumps can thus be serviced by a single person with a crane.
• The NK pump is long-coupled with a totally enclosed fan-cooled standard motor with main dimensions to IEC and DIN standards and mounting designation B3 (IM 1001).

Pumps with standard motors

• IE3
• IE4
• IE5

NB and NK pumps are fitted with standard motors with efficiency classes IE3/IE4/IE5 for low-voltage three-phase motors.

Pumps with electronic speed control

• IE5

NBE and NKE pumps are NB and NK pumps equipped with a motor with built-in frequency converter and the necessary application software to achieve an all-in-one solution enabling electronic speed control.
Electronic speed control enables continuously variable control of motor speed which again enables adaptation of the performance to a given requirement. If a sensor is installed, NBE and NKE pumps allow for any of these configurations and control methods:
• constant pressure
• proportional control
• temperature control
• constant flow.
NBE, NKE pumps with 2-pole motors up to 22 kW and 4- pole motors up to 22 kW are fitted with Grundfos permanent-magnet MGE motors. NBE, NKE pumps with motors from 30 kW 2-pole or 4-pole to 55 kW 2-pole or 4- pole are Nidec permanent-magnet motors coupled with Grundfos CUE. All these motors have efficiency class IE5 according to IEC 60034-30-2.
Why select an E-pump
A pump with electronic speed control offers these benefits:
• energy savings
• increased comfort
• control and monitoring of pump performance
• communication with the pump.
For further information on electronic speed control, see section Speed-controlled pumps.
Energy-optimised pumps
NB, NK pumps are energy-optimised and comply with the EuP Directive, Commission Regulation (EC) No 547/2012, in which most pumps are classified or graduated in an energy efficiency index (MEI). See also section Minimum efficiency index.
ATEX-approved pumps
On request, Grundfos offers NBG and NKG pumps with ATEX-approval in accordance with Directive 94/9/EC, group II, category 2G/D and 3G/D. For more information on ATEX-approved pumps, see the data booklet ''NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE - Custom-built pumps according to EN 733 and ISO 2858''.

4. Product range

The tables on the following pages show the complete product ranges of NB, NBE and NK, NKE pumps. The standard range has been combined on the basis of the following parameters:
Pump
• Pump housings have outlet flanges from DN 32 to DN 250.
• Some stainless steel pump sizes have loose flanges. All others have fixed flanges.
• NB pumps are available in mounting design A, B, C and F. The base frame for C is available as accessory. F has base frame. For further information, see section Mounting design, NB.
• Support blocks: NB, NBG pumps combine with many motor frame sizes. In some cases, support blocks or support rails are needed in order to level out the height difference between pump and motor. Also the size of the motor flange may necessitate the use of supports. See section Supporting blocks, NB. The Grundfos Product Configuration System makes it possible to configure the NB, NBG pump and the supports, if needed.
Motor
• Motors are for 50 Hz.
• NB and NK pumps are available with 2-, 4- and 6-pole motors; NBE and NKE with 2- and 4-pole motors.
• NB and NK pumps are available with IE3 and IE4 motors.
• 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''.
• Some pumps can be delivered as -E products in combination with MGE IE5 motor.
• Some pumps can be delivered as -E products in combination with back mounted CUE + IE4/IE5 motor.
• All pumps with non-E-motor can be connected to an external frequency converter (CUE or other brand).
Custom-built pumps
See the data booklet ''NB, NBG, NK, NKG, NBE, NBGE, NKE, NKGE - Custom-built pumps according to EN 733 and ISO 2858'', or contact Grundfos.
The Grundfos NB series consists of single-stage, end-suction centrifugal pumps designed for various applications, including water supply, industrial pressure boosting, industrial liquid transfer, HVAC (heating, ventilation, and air conditioning), and irrigation.

Design and Construction

1. Compact and Robust Design:
   - Casing Material: Typically made from cast iron, providing durability and resistance to wear and tear.
   - Impeller Material: Available in different materials such as stainless steel, bronze, or cast iron, depending on the pumped liquid and application requirements.
   - Shaft and Bearings: Designed to withstand significant loads, ensuring reliable performance and long service life.

2. Modular Construction:
   - Back Pull-Out Design: Enables maintenance and servicing of the pump without dismantling the pipework, which reduces downtime and maintenance costs.
   - Standardized Components: Many parts are standardized across the NB series, making it easier to find replacement parts and reducing inventory costs.

Technical Specifications

1. Flow and Pressure:
   - Flow Rates: Range from a few cubic meters per hour (m³/h) to several hundred cubic meters per hour, accommodating various application needs.
   - Pressure: Capable of generating pressures suitable for commercial and industrial applications, typically up to 16 bar (depending on the specific model).

2. Temperature Range:
   - Designed to handle a wide range of liquid temperatures, from -25°C to +140°C, making them suitable for both chilled water and hot water applications.

3. Efficiency:
   - Hydraulic Design: Optimized for high efficiency, reducing energy consumption and operational costs.
   - Variable Speed Options: Many NB pumps can be equipped with variable frequency drives (VFDs) to adjust the pump speed according to the demand, further enhancing energy savings.

Applications

1. Water Supply:
   - Ideal for boosting pressure in water supply systems for residential, commercial, and industrial buildings.

2. HVAC Systems:
   - Commonly used in heating, ventilation, and air conditioning systems for circulating chilled water and hot water.

3. Industrial Processes:
   - Suitable for transporting various industrial liquids, including cooling water, process water, and other low-viscosity fluids.

4. Irrigation:
   - Effective in agricultural irrigation systems, ensuring consistent and reliable water delivery.

5. Fire Fighting Systems:
   - Can be used in fire protection systems where reliable and consistent water pressure is critical.

Additional Benefits

1. Customization and Flexibility:
   - Grundfos offers various customization options to tailor the NB pumps to specific application needs, such as different seal types, motor options, and coatings for aggressive liquids.

2. Integration with Control Systems:
   - Can be integrated with Grundfos control and monitoring systems, such as the Grundfos Remote Management (GRM) system, for optimized performance, remote monitoring, and energy management.

3. Reliability and Safety:
   - Designed with high-quality materials and advanced engineering to ensure reliable performance even in demanding conditions.
   - Equipped with various protection features to safeguard against overload, dry running, and other operational hazards.

Conclusion

Grundfos NB pumps are versatile and reliable solutions for a wide range of applications, offering high efficiency, ease of maintenance, and customization options. Their robust design and advanced features make them suitable for both standard and challenging environments, ensuring consistent performance and long service life.

The product range of NB is as below

• NB 32-125.1
• NB 32-125
• NB 32-160.1
• NB 32-160
• NB 32-200
• NB 32-250
• NB 40-125
• NB 40-160
• NB 40-200
• NB 40-250
• NB 40-315
• NB 50-125
• NB 50-160
• NB 50-200
• NB 50-250
• NB 50-315
• NB 65-125
• NB 65-160
• NB 65-200
• NB 65-250
• NB 65-315
• NB 80-160
• NB 80-200
• NB 80-250
• NB 80-315
• NB 100-160
• NB 100-200
• NB 100-250
• NB 100-315
• NB 125-200
• NB 125-250
• NB 125-315
• NB 150-200
• NB 150-250
• NB 150-315.2

The product range of NK is as below

• NK 32-125.1
• NK 32-125
• NK 32-160.1
• NK 32-160
• NK 32-200
• NK 32-250
• NK 40-125
• NK 40-160
• NK 40-200
• NK 40-250
• NK 40-315
• NK 50-125
• NK 50-160
• NK 50-200
• NK 50-250
• NK 50-315
• NK 65-125
• NK 65-160
• NK 65-200
• NK 65-250
• NK 65-315
• NK 80-160
• NK 80-200
• NK 80-250
• NK 80-315
• NK 100-160
• NK 100-200
• NK 100-250
• NK 100-315
• NK 125-200
• NK 125-250
• NK 125-315
• NK 150-200
• NK 150-250
• NK 150-315.2