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Grundfos CRN Pumps with Magnetic Drive
Grundfos CRN pumps with magnetic drive represent a specialized segment within the CR series, combining the robust features of the standard CRN pumps with the added benefits of a magnetic drive system. This design eliminates the need for mechanical seals, offering significant advantages in terms of reliability, maintenance, and the ability to handle hazardous or corrosive fluids. Here’s a detailed breakdown of the engineering aspects and applications of these pumps:
1. Design and Construction
Materials:
- Pump Components: Typically constructed from high-grade stainless steel (AISI 304, AISI 316, or even titanium for extremely corrosive environments), ensuring resistance to corrosion, wear, and chemical attack.
- Magnetic Drive: Comprises powerful rare-earth magnets (usually neodymium), ensuring a strong, consistent coupling between the motor and the pump shaft without physical contact.
Configuration:
- Magnetic Coupling: Consists of an inner and outer magnet assembly. The outer magnet is connected to the motor, while the inner magnet is connected to the pump impeller. Magnetic fields transfer torque without the need for a physical connection, thus eliminating the risk of leakage.
- Sealless Design: Since there are no mechanical seals, the potential for leakage is drastically reduced, making these pumps ideal for handling hazardous, toxic, or ultra-pure fluids.
2. Operating Principles
Magnetic Coupling:
- Torque Transmission: The motor turns the outer magnetic assembly, which in turn rotates the inner magnetic assembly connected to the impeller. The magnetic field effectively transmits torque without direct contact, enabling the pump to move fluids efficiently.
- Leakage Prevention: The sealless design means there is no direct path for fluid to escape, significantly reducing the risk of leaks and contamination.
3. Key Features
Efficiency:
- Hydraulic Design: Optimized using advanced CFD techniques to ensure maximum efficiency in fluid handling and minimal energy consumption.
- Variable Speed Drives (VSDs): Often integrated to allow precise control of pump speed based on real-time demand, improving energy efficiency and operational flexibility.
Durability and Reliability:
- No Mechanical Seals: Eliminates one of the primary failure points in traditional pumps, significantly reducing maintenance requirements and downtime.
- Robust Construction: High-quality materials and precision engineering ensure long service life and reliability, even under demanding conditions.
Safety and Environmental Benefits:
- Leak-Free Operation: Ideal for applications involving hazardous, toxic, or environmentally sensitive fluids, as there is no risk of leakage.
- Reduced Maintenance: The absence of mechanical seals reduces maintenance complexity and frequency, lowering operational costs and improving safety.
4. Applications
Chemical Processing:
- Hazardous Chemicals: Safely handles toxic, corrosive, and hazardous chemicals without the risk of leakage.
- High-Purity Applications: Suitable for ultra-pure fluid transfer in industries such as pharmaceuticals and electronics manufacturing.
Oil and Gas:
- Corrosive Fluids: Effective in pumping corrosive fluids and hydrocarbons, reducing the risk of environmental contamination.
- High-Pressure Applications: Suitable for high-pressure systems found in the oil and gas industry.
Water Treatment:
- Aggressive Fluids: Handles aggressive chemicals used in water treatment processes, ensuring safe and reliable operation.
- Reverse Osmosis Systems: Used in high-pressure RO systems where leakage and contamination are critical concerns.
Industrial Applications:
- Cooling and Heating Systems: Efficiently circulates fluids in cooling and heating systems, particularly where leakage prevention is crucial.
- Process Engineering: Used in various industrial processes that require reliable and leak-free fluid handling.
Food and Beverage:
- Hygienic Applications: Ensures contamination-free transfer of liquids in food and beverage production, maintaining high hygiene standards.
- CIP Systems: Suitable for Clean-In-Place systems, reducing the risk of contamination during cleaning cycles.
Summary
Grundfos CRN pumps with magnetic drive technology provide a highly efficient, reliable, and safe solution for handling a wide range of fluids, including hazardous, corrosive, and high-purity liquids. Their sealless design minimizes the risk of leaks, reduces maintenance requirements, and ensures environmental safety. These pumps are ideal for demanding industrial applications, chemical processing, water treatment, and any scenario where fluid integrity and system reliability are paramount.
Grundfos CR Pumps
1. Design and Construction
Multi-Stage Configuration
Grundfos CR pumps are multi-stage centrifugal pumps, meaning they have multiple impellers mounted on a single shaft. Each impeller increases the fluid pressure incrementally, allowing the pump to achieve high pressures efficiently. The stages are arranged in a vertical stack, which is space-saving and allows for easier integration into systems with limited horizontal space.
Vertical Inline Design
The vertical inline design ensures that the pump occupies a minimal footprint. This configuration aligns the inlet and outlet on the same vertical axis, simplifying piping and reducing the need for complex support structures.
Material Variants
Grundfos CR pumps come in various material options to handle different types of fluids and operating environments:
- Cast Iron: Suitable for general water supply and non-corrosive fluids.
- Stainless Steel (304 and 316): Ideal for slightly aggressive fluids, offering good resistance to corrosion and chemicals.
- Titanium: Used for highly corrosive environments, such as seawater or aggressive chemicals.
Seal Options
Different mechanical seals are available to match the pumped fluid's properties and operating conditions, ensuring leak-free operation and long service life.
2. Operational Principles
Impeller Dynamics
Each impeller in the CR pump imparts energy to the fluid, converting mechanical energy from the motor into kinetic energy and subsequently into pressure. The fluid flows from one stage to the next through a diffuser, which directs the flow smoothly into the subsequent impeller.
Efficiency and Control
CR pumps are equipped with high-efficiency motors, often meeting or exceeding IE3/IE4 efficiency standards. When paired with a Variable Frequency Drive (VFD), the motor speed can be adjusted to match the system's demand, optimizing energy use and reducing operational costs.
3. Applications and Engineering Considerations
Water Supply and Distribution
- Municipal Systems: CR pumps provide consistent pressure to transport water from treatment plants to consumers, overcoming elevation changes and distribution network losses.
- High-Rise Buildings: They maintain adequate water pressure across all floors, addressing the challenges of vertical lift in tall structures.
Industrial Applications
- Boiler Feed Pumps: In power plants, CR pumps supply high-pressure feed water to boilers. The high pressure ensures efficient steam generation and system reliability.
- Cooling and Chiller Systems: CR pumps circulate cooling water in closed-loop systems, essential for maintaining process temperatures in industrial operations.
Irrigation Systems
- Field Irrigation: These pumps deliver water to irrigation systems over long distances or elevations, ensuring even water distribution across large agricultural areas.
- Greenhouse Watering: They provide precise pressure control for drip and sprinkler systems, optimizing water usage and plant health.
Water Treatment
- Reverse Osmosis (RO) Systems: CR pumps generate the high pressures needed for RO membranes to function effectively, removing salts and impurities from water.
- Filtration: They supply water at controlled pressures to filtration units, ensuring optimal filtration efficiency and longevity of filter media.
Fire Fighting Systems
- Fire Suppression: CR pumps are crucial in maintaining high-pressure water supply for sprinkler and hydrant systems, ensuring quick and effective response during fire emergencies.
Mining and Construction
- Dust Suppression: High-pressure water mist systems utilize CR pumps to minimize airborne dust, improving air quality and worker safety.
- Dewatering: CR pumps remove water from excavation sites and mines, preventing flooding and ensuring operational continuity.
4. Advanced Features and Benefits
Modular Design
The modularity of Grundfos CR pumps allows for customization and easy upgrades. Stages can be added or removed to match changing pressure requirements, and components can be swapped out for maintenance without replacing the entire pump.
Smart Pump Technology
Grundfos offers integrated intelligence with some CR pump models, featuring built-in sensors and control systems. These smart pumps can monitor operating conditions, optimize performance, and alert operators to potential issues, reducing downtime and maintenance costs.
Corrosion Resistance
Material options like stainless steel and titanium provide excellent corrosion resistance, extending the pump's lifespan in harsh environments and reducing maintenance frequency.
Conclusion
Grundfos CR pumps are engineered to provide high pressure and efficient fluid handling across a broad spectrum of applications. Their multi-stage, vertical design, combined with advanced materials and smart technology, make them a versatile and reliable choice for demanding engineering applications. Whether for water supply, industrial processes, irrigation, or fire fighting, Grundfos CR pumps deliver consistent performance, energy efficiency, and long-term durability.
Customized CR pumps
We offer a wide range of customized variants of the CR type range for a variety of demanding industrial
applications.
With these multistage in-line pumps, based on the wellknown CR type range, we meet the customers' needs for pumps capable of handling special installation requirements and these liquids:
• high-temperature liquids
• crystallising liquids
• high-viscosity liquids such as paints and varnishes
• aggressive liquids
• volatile liquids
• flammable liquids.
Most of the pumps are available with either mainsoperated motors (CR, CRI and CRN) or electronically speed-controlled motors (CRE, CRIE and CRNE).
Pumps for specific requirements
CR pumps can be customized to meet customer-specific requirements. This is due to the ''mix-and-match'' approach to customization, where the many pump features and options are to be regarded as modules that
can be combined to create the ideal pump for the job at hand.
Motor options
CR motors are available in many different configurations to meet the requirements presented by the power supply, the pump environment and/or the pumped liquid itself.
• Power supply systems vary in terms of both frequency and voltage, and required protection methods.
• The environment may be explosive, very hot and/or very humid. Special conditions also apply at high altitudes.
• The pumped liquid can call for a special motor solution. High or low viscosities and/or high or low densities may require non-standard motor sizes. You may also need an explosion-proof variant.
• The installation site of the pump may require alternative positions of pump and motor parts, such as terminal box positions and vent screw positions.
Shaft seal options
Extreme liquids sometimes call for extreme measures.
• High temperatures damage seal faces unless precautions are taken.
• Concern for safety can necessitate special measures for aggressive, toxic or flammable liquids.
• Liquids can be harmful to shaft seals because they crystallise, harden or are extremely abrasive.
Pump options
The CR pump elements can handle the most demanding liquids and pressures and be adapted to suit many other requirements.
• Horizontal installation if height is a limitation.
• Poor inlet conditions mean that NPSH values must be adjusted to avoid cavitation.
• Very high pressures demand special solutions.
• Special surface treatments or certificates may be required.
Connection options
Your chosen pump elements can be fitted with exactly the connection options you need. All standards are covered, and special connection variants are available for maximum compactness, for example high liquid pressures.
Features and benefits
Customized CR pumps have the following features and benefits:
Grundfos motor
Grundfos motors are remarkably silent and highly efficient.
3-phase pumps from 1.1 to 200 kW have premium efficiency IE3 motors as standard and optionally super premium efficiency IE4 and IE5. Grundfos motors are available with integrated frequency converter designed for speed-controlled operation. Speed-controlled operation can also be obtained by connecting a fixed speed motor to an external Grundfos CUE or Danfoss frequency converter.
Shaft seal solutions
The specially designed cartridge seal increases reliability, ensures safe handling and enables easy service and access.
The cartridge shaft seal comes in a wide choice of materials. It is available in single and double seal arrangements and magnetic drive configurations.
Connections
The Grundfos CR pump can be connected to any system.
The Grundfos CR pump is available in four different material variants:
CRT, CRTE: Titanium
CRN, CRNE: Stainless steel AISI 316
CRI, CRIE: Stainless steel AISI 304
CR, CRE: Stainless steel AISI 304/cast iron.
Wide range of pump sizes
The CR pump comes in 16 flow sizes and hundreds of pressure sizes, ensuring that you can always find exactly the right pump for the job.
High-performance hydraulics
Pump efficiency is maximized by the optimized hydraulics and carefully crafted production technology.
Dry-running protection
The patented Grundfos LiqTec system eliminates the risk of breakdowns due to dry running. If there is no liquid in the pump, the LiqTec will stop the pump immediately.
ErP compliant
The product is energy-optimized and complies with the ecodesign requirements for water pumps specified in the ErP Directive (Commission Regulation (EC) No 547/2012), which became effective on 1 January 2013. As
from this date, all pumps are classified and graduated in the Minimum Efficiency Index (MEI).
Minimum efficiency index
Minimum efficiency index (MEI) means the dimensionless scale unit for hydraulic pump efficiency at best efficiency point (BEP), part load (PL) and overload (OL). The Commission Regulation (EU) sets efficiency requirements to MEI ≥ 0.10 as from 1 January 2013 and MEI ≥ 0.40 as from 1 January 2015. An indicative benchmark for bestperforming water pump available on the market as from 1 January 2013 is determined in the Commission
Regulation.
• The benchmark for most efficient water pumps is MEI ≥ 0.70.
• The efficiency of a pump with a trimmed impeller is usually lower than that of a pump with the full impeller diameter. The trimming of the impeller will adapt the pump to a fixed duty point, leading to reduced energy
consumption. The minimum efficiency index (MEI) is based on the full impeller diameter.
• The operation of this water pump with variable duty points may be more efficient and economic when controlled, for example, by the use of a variable-speed drive that matches the pump duty to the system.
MEI Valued for CR Pumps
| Pump Type |
MEI |
| CR 1s-3 |
0.54 |
| CR 1-3 |
>0.70 |
| CR 3-3 |
>0.70 |
| CR 5-3 |
0.57 |
| CR 10-3 |
>0.70 |
| CR 15-3 |
>0.70 |
| CR 20-3 |
>0.70 |
| CR 32-3 |
>0.70 |
| CR 45-3 |
>0.70 |
| CR 64-3 |
>0.70 |
| CR 95-3 |
>0.70 |
| CR 125-3 |
>0.70 |
| CR 155-3 |
>0.70 |
| CR 185-3 |
>0.70 |
| CR 215-3 |
>0.70 |
| CR 255-3 |
>0.70 |
Applications
High-pressure applications
Reference applications
• Filtration
• reverse osmosis
• cleaning and washing
• boiler feed.
Customized solutions
High-pressure applications often expose pumps to a variety of extreme conditions, such as high inlet pressure, high operating pressure, frequent starts/stops and pressure pulsing. Overload of the pump may cause increased wear of pump parts, such as motor bearings and shaft seal, and thus reduce the pump life.
To avoid unexpected breakdowns, we offer customized solutions designed to meet your needs!
High-pressure handling
We offer high-pressure pumps specially designed to cope with pressures up to 50 bar at maximum 120 °C.
When necessary, CR high-pressure pumps are fitted with a bearing flange. A bearing flange is an additional flange with an oversize ball bearing designed to absorb axial forces in both directions.
CR high-pressure pumps come in two variants: as a single-pump solution or as a two-pump solution. The single-pump solution is used for flow rates up to 5 m3/h, while the two-pump solution is for flow rates above 5 m3/h.
Single-pump solutions
Our single-pump solutions include the pump types CRNE 1 HS and CRNE 3 HS. CRNE HS pumps are fitted with a high-speed motor with integrated frequency converter.
To minimise the pressure on the shaft seal, the direction of rotation is the opposite of the direction of standard pumps, and the chamber stack is turned upside down.
Consequently, the pumped liquid flows in the opposite direction.
Two-pump solutions
We offer two-pump solutions for the following pumps:
• CRN 3, 5, 10, 15, 20, 32, 45, 64 SF
The solution consists of two pumps in series. The first pump is a standard pump for feeding. The second pump is either a high-pressure pump (SF) specially designed for high pressure or a standard pump.
To minimise the pressure on the shaft seal, the direction of rotation on CR SF pumps is the opposite of that of standard pumps, and the chamber stack is turned upside down. Consequently, the pumped liquid flows in the opposite direction.
Supplementary Grundfos pumps
For pressures above 50 bar, we recommend Grundfos BM modules or Grundfos BME, BMET pumps.
Further information about BM modules and BME, BMET pumps is available in Grundfos Product Center
Hot-water applications
Reference applications
• Boiler feeding
• applications involving poor inlet conditions
• cleaning and washing applications
• high-temperature applications.
Customized solutions
Hot-water applications often expose pumps to a variety of extreme conditions, such as high temperatures, long operating hours, frequent starts/stops, pressure pulsing, poor inlet conditions and high inlet pressure. Such conditions may result in cavitation and/or cause increased wear of pump parts, for instance motor bearings and shaft seal, and thus reduce the pump life.
To avoid breakdowns, we offer customized solutions designed to meet your needs! We provide solutions for applications involving special requirements, for example:
• steady steam production
• poor inlet conditions
• high temperature.
Steady steam production
To ensure steady steam production and a constant water level in the boiler tank, we recommend speed-controlled pumps.
We recommend speed-controlled pumps for the following reasons:
• Steady and continuous flow of water increases efficiency of the boiler.
• The reaction to changes in the steam consumption is faster compared to the on/off pump control.
• The water level in the boiler feed tank is kept stable, which ensures higher steam quality and less humidity in the steam.
• The installation and maintenance costs are lower compared to systems with on/off controlled pumps and valves as well as systems with level control and modulating feed valves.
• No bypass pipe is needed.
Applications involving poor inlet conditions
Cavitation is often a problem in applications where pumps have to cope with the combination of high liquid temperatures, poor inlet pressure and/or a high flow rate.
Low-NPSH pumps eliminate the risk of cavitation and ensure stable and reliable operation.
The CR low-NPSH pump is a pump with a special first stage design that reduces the NPSH value and prevents erosion and destruction of the pump, pipes and valves.
For further information about NPSH and the calculation of NPSH-values, see the relevant data booklets available in Grundfos Product Center.
High-temperature applications
The pumping of hot liquids demands much of pump parts, such as the shaft seal and rubber parts.
To ensure reliable and stable production, we offer CR pumps with an air-cooled top.
A CR pump with an air-cooled top has a standard mechanical shaft seal handling liquid temperatures up to 180 °C at 25 bar without external cooling. At the same time, the pump delivers a high pressure. As the name implies, the pump is fitted with a special air-cooled shaft seal chamber generating the same insulation effects as that of a vacuum flask.
Temperature control applications
Reference applications
Cooling systems:
• Electronic data processing
• laser equipment
• medical equipment
• industrial cooling and freezing processes.
Temperature-control systems:
• Casting and moulding tools
• oil processing.
Customized solutions
To ensure safe and reliable operation in applications involving temperature control, we offer customized solutions designed to meet your needs!
We provide solutions for applications involving pumping of the following liquids:
• liquids at temperatures down to -40 °C
• high-temperature liquids
• high-viscous liquids, and similar.
Pumping of liquids down to -40 °C
In applications where liquids are pumped at temperatures down to -40 °C, it is crucial for successful production that pump parts are of the right materials and dimensions.
At such low temperatures, wrong materials and dimensions may cause deformation because of thermal expansion, and eventually stoppage of operation.
For low-temperature liquids below -20 °C, we recommend CRN pumps.
Pumping of high-temperature liquids
The pumping of hot liquids demands much of pump parts, such as shaft seals and rubber parts. Examples of such liquids:
• water-based liquids up to 180 °C at PN 25
• thermal oils up to 240 °C at PN 16.
To ensure reliable and stable production, we offer CR pumps with an air-cooled top and special rubber parts.
A CR pump with an air-cooled top is a pump which can handle high temperatures and deliver a high pressure.
The pump is fitted with a special air-cooled shaft seal chamber generating the same insulation effects as that of a vacuum flask.
Pumping of high-viscous liquids
In applications where high-viscous liquids are pumped, precautions must be taken to ensure that the motor of the pump is not overloaded, and that the pump performance is not reduced too much.
The viscosity of a pumped liquid depends strongly on the liquid temperature.
To ensure stable and reliable operation, we offer CR pumps with oversize motors.
Aggressive/hazardous liquids
Reference applications
• Chemical industry
• pharmaceutical industry
• refineries
• petrochemical industry
• distilling plants
• paint industry
• mining.
Customized solutions
In industries where pumping of dangerous and aggressive liquids is an integrated part of the daily production, safety is top priority. Leaking pumps pose a danger to the environment.
To prevent breakdowns, we offer customized solutions designed to meet your needs!
We provide solutions for the following liquids:
• aggressive and abrasive liquids
• toxic and hazardous liquids
• flammable liquids
• odorous liquids.
To ensure safe handling of the above liquids, we offer the following pumps:
• pumps with tandem seal arrangement and flushing
• pumps with back-to-back seal arrangement and pressure intensifier
• pumps with magnetic drive (MAGdrive)
• pumps with ATEX approval.
Pumps with tandem seal arrangement
Pumps with tandem seal arrangements connected to a flushing device are used for crystallising, hardening or sticky liquids.
If the primary seal leaks, the leaking liquid will be flushed away by a flushing liquid.
Pumps with back-to-back seal arrangement
We recommend pumps with back-to-back seal arrangements for toxic, aggressive or flammable liquids.
Pumps with back-to-back seal arrangements are connected to systems that provide a higher pressure than the maximum pump pressure preventing leakage from the pump to the atmosphere side.
MAGdrive pumps
We recommend pumps with magnetic drive (MAGdrive) for toxic and hazardous liquids.
The MAGdrive pump is a hermetically sealed pump. In the MAGdrive pump, the power from the motor is transmitted to the pump shaft by means of magnetic force instead of a traditional coupling.
The motor shaft and the pump shaft are hermetically separated from each other.
ATEX-approved pumps
We recommend ATEX-approved pumps for potentially explosive atmospheres. Explosive atmospheres consist of air and combustible matter such as gases, vapours, mists or dusts in which the explosion spreads after ignition.
Electropolished pumps
We recommend electropolished pumps for applications with strict requirements concerning corrosion and cleanability.
We offer electropolished pumps in all CRN pump sizes.
Hygienic applications
CR pumps are not designed for the pumping of hygienic and sterile liquids, but their construction and the choice of materials make them an ideal solution for secondary processes in hygienic applications.
Reference applications
• Pharmaceutical industry
• biotechnological industry
• electronics industry
• food and beverage industry
• process industry.
Customized solutions
We provide solutions for applications involving special requirements to hygienic design, materials, surface quality and cleanability.
Hygienic design
The surface quality of pump parts is of utmost importance
- both for corrosion resistance and microbial adhesion and growth.
To meet the strict hygienic requirements to material and surface quality in secondary hygienic processes, we offer electropolished stainless steel CRN pumps with the following surface quality:
Note that CRN pumps are not sanitary pumps regardless of the surface quality.
Furthermore, we offer a wide variety of connections, such as TriClamp connections, specially designed for pharmaceutical, food and beverage industries. For further information about TriClamp connections, see section
about connections.
We offer the following pumps:
• cleaned and dried pumps
• mechanically or electropolished pumps.
Electropolished pumps have a higher corrosion resistance than non-polished pumps.
Cleanability
For secondary hygienic applications, for example nonfood contact applications, we recommend CRN and CRE pumps which have all pump parts in stainless steel. As the surface and properties of the metal is not affected by cleaning agents, stainless steel is the ideal solution.
ATEX-approved pumps
We recommend ATEX-approved pumps for potentially explosive atmospheres. Explosive atmospheres consist of air and combustible matter such as gases, vapours, mists or dusts in which the explosion spreads after ignition.
Special installation requirements
Reference applications
• Places with limited access and space
• ships
• mobile applications
• fire protection
• earthquake-prone areas
• applications in remote areas.
Customized solutions
Due to safety, location and arrangement requirements, some installations require pumps of another design than traditional vertical pumps.
To meet special installation requirements, we offer customized solutions designed to meet your needs!
We provide solutions for the following pump types:
• horizontally mounted pumps
• belt-driven pumps
• pumps with alternative mounting.
Horizontally mounted pumps
We recommend horizontally mounted pumps in the following cases:
• installations with limited access and space, for instance cabinets and compact systems
• installations with limited height
• earthquake-prone areas
• mobile systems, for instance ships and vehicles.
Horizontally mounted pumps lower the centre of gravity and thus minimise swings during an earthquake.
Horizontal mounting requires special mounting plates.
Belt-driven pumps
Belt-driven pumps are often selected in the following cases:
• non-electrically driven applications for instance air-, solar-, wind-, diesel- and pneumatically driven applications
• installations requiring an alternative supply, for instance firefighting systems and emergency pumps.
The construction of belt-driven pumps is like that of electrically driven pumps, but belt-driven pumps have a pulley and belt connected to a combustion motor or other device.
Alternative mounting for limited access and space
For installations with limited access and space, we offer pumps with alternative mounting of pump parts such as terminal box and vent screw.
Certificates, approvals and reports
We offer customized pumps with a wide variety of certificates and approvals, for example:
• Inspection certificate 3.1C
- Lloyds Register of Shipping (LRS)
- Det Norske Veritas (DNV)
• ATEX, VIK and UL approvals
• Duty-point verification report
• Vibration test report.
Special applications
Reference applications
• Off-shore and maritime applications
• cooling applications
• deep-well pumping systems
• pumps operating under special conditions.
Customized solutions
We offer customized solutions for a number of applications not mentioned on the previous pages, for example the following:
• Off-shore and maritime applications
• pumping of liquids down to -40 °C
• deep-well pumping in small water supply systems
• special conditions
• special requirements as to approvals, voltage and frequency.
To ensure stable and reliable operation, we offer customized solutions designed to meet your needs!
Off-shore and maritime applications
In off-shore and maritime applications, pumps must meet strict requirements to reliability in connection with for instance cooling, firefighting, cleaning and desalination systems. Pumps are often installed in a corrosive environment.
We offer customized pumps with a wide variety of 3.1C inspection certificates, such as Lloyds Register of Shipping (LRS) and Det Norske Veritas (DNV).
Furthermore, we offer customized pumps with a wide variety of materials, connections and enclosure classes.
For the pumping of seawater, we recommend CRT and CRE pumps which have all pump parts in titanium. As the corrosion resistance of CRT and CRE pumps is not affected by seawater, titanium is the ideal solution.
Pumping of liquids down to -40 °C
In applications with liquid temperatures down to -40 °C, the material of shaft seal faces, the dimensions of the neck ring and other factors must meet high requirements.
At such low temperatures, choosing the wrong materials and dimensions may cause deformation in the pipes because of thermal expansion, and eventually stoppage of operation.
For liquids below -20 °C, we recommend CRN pumps.
Deep-well pumping in small water supply systems
Water is pumped from depths down to 90 metres. The system consists of a dry-mounted CR pump connected to a submerged ejector.
Pumps operating under special conditions
• Installations at high altitudes:
> 3,500 metres if fitted with Grundfos MG IE3 motors
> 2,750 metres if fitted with Siemens IE3 motors
> 1,000 metres if fitted with Grundfos MGE motors.
• applications with low, high or fluctuating ambient temperatures
• the pumping of high-viscous/-density liquids.
In such cases, the motor may be overloaded and an oversize motor may be required.
Special requirements
We offer customized pumps meeting special requirements to approvals, voltage and frequency.
Supplementary Grundfos pumps
If the suction head exceeds 90 metres, we recommend Grundfos SP and SQ submersible pumps.
Further information about SP and SQ pumps is in Grundfos Product Center.
Accessories
ATEX-approved dry-running protection
For environments of group II, category 2G, always use dry-running protection.
The link between ATEX groups, categories and zones is explained in the 1999/92/EC directive. Please note that this is a minimum directive. Some EEC countries may therefore have stricter local rules. The user or installer is
always responsible for checking that the group and category of the pump correspond to the zone classification of the installation site.
Motor
The Grundfos standard range of motors meets a wide variety of application demands. For special applications or operating conditions, we offer various customized solutions:
• a wide range of motor approvals
• motors with special voltage
• motors with an anti-condensation heater
• motors with Harting® 10-pin multiplug connection
• motors with built-in PTC sensor
• motors with built-in thermal switch
• undersize and oversize motors
• motors with alternative enclosure class
• motors with bearings suitable for high-temperature operating conditions (bearings are packed with grease suitable for high temperatures)
• IE4 motors
• IE5 motors with permanent magnet rotor.
VIK-approved motors
We recommend VIK-approved motors for industrial climates where aggressive gasses and/or aggressive vapours are likely to occur.
The VIK standard applies to three-phase mains-operated motors and three-phase motors connected to a frequency converter.
We offer VIK-approved motors from 0.37 to 200 kW in accordance with the requirements of the German industrial standard, Verband der Industriellen Energieund Kraftwirtschaft. To comply with the standard, VIKapproved motors must meet these requirements:
• Group II, Category 2, version EEx e or EEx d, temperature class T3 in the ATEX directive. In case of doubt, consult the above standard or contact Grundfos.
• Enclosure class IP55 as a minimum.
• Protected against sucking. This phenomenon may occur when the pressure inside the motor is lower than the atmospheric pressure. In such cases, moisture is sucked from the atmospheric side into the motor through for example bearing housings
Tropicalised motors
A tropicalised motor does not contain paper, wood or similar materials containing wood pulp.
Grundfos defines a tropicalised motor as a motor which fulfils the climate group ''World-Wide'' in DIN/IEC 721-2-1 and has the following characteristics:
• enamel-covered windings
• double winding impregnation
• double winding insulation
• FPM V-ring
• terminal board made of polyester
• liquid sealing between frame and flange/end shield
• all outside screws made of stainless steel
• 30 μm paint layer on aluminium stator housings
• 120 μm paint layer on cast-iron stator housings
• heating element.
Energy
We offer mains-operated motors that comply with these energy standards:
• CEL
• EISA 2007
• KEMCO
• INMETRO
• NOM-016-ENER
• cURus ENERGY.
Other motor approvals
We offer a wide range of motor approvals, for example the following:
• CCC
• C-tick
• GOST
• BΔ
• TSU
• METI/JQA
• CB
• TSENK.
ATEX-approved pumps
TM016193
ATEX-approved pumps are for use in potentially explosive atmospheres. Explosive atmospheres consist of air and combustible matter such as gases, vapours, mists or dusts in which the explosion spreads after ignition.
We offer explosion-proof motors in accordance with the EU directive 2014/34/EU, the so-called ATEX directive.
The ATEX-approved pumps can be used in areas (zones) classified according to the directive 1999/92/EC. In case of doubt, consult the above-mentioned directives or contact Grundfos.
ATEX-approved pumps are supplied with serial number, special installation and operating instructions, and a nameplate showing the ATEX classification. The
nameplate includes an ''X'' to indicate that the product is subject to special conditions for safe use. An ATEX certificate is available on request.
Air-cooled top
CR pumps with an air-cooled top are used where the pumping of hot liquids is crucial for successful production.
A CR pump with an air-cooled top is a pump with a special air-cooled shaft seal chamber generating the same insulation effect as a vacuum flask. No external cooling is necessary; the ambient temperature is sufficient.
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CR pumps with an air-cooled top have a mechanical silicon carbide/silicon carbide/EPDM cartridge shaft seal, type HQQE, as standard.
The pumps are able to handle liquid temperatures up to 180 °C at maximum pressure of PN 25 for CR 1s-155 pumps. If the pumped liquid is oil, the pumps can handle liquid temperatures up to 240 °C at maximum PN 16
Temperatures above 120 °C normally result in a substantial reduction of seal life due to poor lubrication of the seal faces. As the temperature in the seal chamber does not exceed 120 °C during operation, a standard Grundfos shaft seal can be used. An automatic vent is required for venting the pump seal chamber.
Note that for safety reasons, you must fit a pipe in order to lead away steam from the vent to a drain. Observe local regulations.
Magnetic-drive pump (MAGdrive)
Grundfos CRN MAGdrive pumps operate according to a patented, magnetic-drive system that eliminates the need for shaft seals. The power from the motor is transmitted to the pump by magnetic force and not by a conventional coupling. Combined with a semi-hermetically sealed liquid end, the pump is essentially leak-free.
As all axial forces are absorbed in the MAGdrive system, the pump incorporates a standard IEC or NEMA motor with keyway and deep-groove ball bearing.
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As a minimum, a soft starter is required for these motors:
• 2-pole motors: 18.5 and 22 kW
• 4-pole motors: 1.1 kW to 11 kW.
Features and benefits
CRN MAGdrive offers the following special features and benefits:
• a semi-hermetically sealed drive system for essentially leak-free pump operation
• a self-regulating heat-tracing cable for eliminating ice formation
• a special choice of materials and design for low energy loss
• a simple pump design for ease of service
• a unique pump design for efficient cooling of magnet by means of the pumped liquid
• an ATEX version available.
Applications
The CRN MAGdrive pump is suitable for a wide selection of industrial applications such as:
• Aggressive or corrosive liquids
For example concentrated sulphuric acid, nitric acid and phosphoric acid.
• Toxic liquids
For example trichloroethylene, chloroform and phenol.
• Flammable and combustible liquids
For example petrol, jet fuels, LPG and alcohols.
• Hardening/curing liquids
For example paint, glue and resins.
• Crystallising liquids
For example glycol additives, naphthalene, sugar products and salts.
• Refrigerants
For example ammonia and synthetic chemicals (HCFC, HFC)
The configuration of the CRN MAGdrive pump is almost identical to that of the standard CRN pump.
The following rubber parts solutions are available:
• EPDM
• FXM (Fluoraz®)
• FFKM (Kalrez®)
• FKM (Viton®)
• CR (Neoprene) *.
Horizontal in-line pumps
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Horizontal pumps are used in applications for safety and/or space-saving reasons.
In areas prone to earthquakes, horizontal pumps are more reliable than vertical pumps. In case of earthquake, the design and mounting of the pump will dampen the oscillations of the pump.
In installations with limited access or space, we recommend horizontal pumps to improve installation and service.
Multistage horizontal end-suction pumps
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CR-H, CRI-H, CRN-H 50/60 Hz
CR-H, CRI-H, CRN-H pumps are horizontal end-suction pumps typically mounted on base plates. The pumps are available in a complete 50 and 60 Hz range with both IEC or NEMA motors.
Interchangeable ANSI solution
The patented loose-flange concept provides easy installation in ANSI, DIN or JIS standard pipes.
Pump connection configurations comply with the ANSI/ ASME B73.1 standard and ensure interchangeability with traditional end-suction pumps with an axial inlet port and radial centre-line outlet port. This makes the CR-H a highefficiency solution designed for drop-in replacement of ANSI configured pumps. The back pull-out design enables service of most versions without removing the base from the pipes.
CR-H, CRI-H, CRN-H pumps are suitable for a variety of applications from pumping of drinking water to pumping of chemicals. The pumps are therefore used in a wide variety of pumping systems where the performance and material of the pump meet specific demands.
Energy efficiency
To reduce loss and increase pump efficiency, CR-H, CRIH, CRN-H pumps are available in an energy-optimised version with inlet and outlet ports with a larger diameter than ANSI specifications.
Maximum pressure: 30 bar.
Maximum liquid temperature: 120 °C. Note that CR
pumps with an air-cooled top have a maximum liquid temperature of 180 °C (240 °C for oil).
Maximum motor size: 45 kW.
Variants
The same variants and accessories are available for the CR-H, CRI-H, CRN-H pump range as for the standard CR
pump range. The only difference between the CR horizontal end-suction pump and the CR in-line pump is the base. However, the base for horizontal end-suction pumps is not available in titanium.
Belt-driven pumps
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Belt-driven pumps are used in applications for spacesaving reasons or where no electrical power is available.
The belt-driven pump has a pulley for connection to an internal combustion engine. The belt-driven CR pumps are of the same construction as electrically driven CR pumps.
CRT 2, 4, 8 and 16 pumps are also available as beltdriven pumps.
An additional bearing has been added on top of an existing bearing flange. The two bearings are fitted backto-back. This bearing design makes it possible to withstand the extra radial forces caused by a pulley.
A pulley can be attached to the end of the shaft. Note that the pulley is not supplied with the pump. By means of pulley belts, the pump can be driven by a motor mounted next to it rather than on top of it.
The pump can be mounted horizontally or vertically by the extra support plates.
The pulley head is positioned on the motor stool where the motor would normally be fitted. By means of the existing holes in the motor stool, the pulley head can be secured to the motor stool with bolts, washers and nuts.
The pulley wheel is then attached to the shaft using an appropriate bush and key.
CR, CRI deep-well pumps
CR, CRI deep-well pumps are used for deep-well pumping in small water supply systems where water is pumped from depths (HD) down to 90 metres
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The pump system consists of a dry-installed CR, CRI multistage centrifugal pump connected to a one-size submerged ejector via two pipes.
We recommend that you connect a pressure tank to the outlet side of the pump to maintain a suitable pressure at the tapping point
CRE pump solutions
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Besides continuously variable performance, CRE, CRIE, CRNE, CRTE pumps offer a number of advantages depending on the hardware and software combinations of the motor.
CRE pumps are not dependent on the frequency of the supply voltage and are designed for operation at frequencies between 750 min-1 and 6000 min-1. This offers a number of advantages:
• compact pump
• higher performance in relation to physical size
• larger dynamic range
• less noise at reduced speed
• more gentle handling of the pumped liquid at reduced speed.
The speed may be chosen freely, taking into consideration the maximum motor load and the hydraulic properties of the pump. Pumps can be delivered with oversize or undersize motors depending on load profile. Ball bearing configuration can also be altered to fit load and demands.
Customized CRE pump solutions
As an alternative to the standard CRE pump solutions, we offer CRE pumps customized for your requirements.
You can configure CRE pumps as follows:
• Selecting an operating panel on the front of the terminal box of the motor.
• Selecting a communication module for bus standards such as GENIbus, LONWorks, PROFIBUS.
• Selecting a customized functionality by means of special configuration files (gsc-files).
Control options
It is possible to communicate with E-pumps via the following platforms:
• the operating panel on the pump
• Grundfos GO
• Grundfos GO Link
• the central management system.
The purpose of controlling an E-pump is to monitor and control the pressure, temperature, flow and liquid level of the system.
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