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A canned motor pump is a compact, hermetically sealed unit integrating both the pump and motor within a single enclosure. Unlike traditional pumps, it eliminates the need for an external shaft seal, reducing maintenance and minimizing the risk of fluid leakage. This design enhances efficiency, making it suitable for applications in industries such as chemical processing and pharmaceuticals. The sealed construction ensures a secure containment for potentially hazardous fluids, contributing to environmental safety. Its compact form and reliability make canned motor pumps ideal for use in confined spaces where space optimization and leak-tight operation are essential.

canned motor pump product | SeFluid

Specification

Max Power: 315 kw
Max Capacity: 800 m³/h
Flow Head: Max. 800m
Max Temperature: 450℃

How a canned motor pump works

A canned motor pump, also known as a hermetic seal pump or enclosed impeller pump, is a specialized type of centrifugal pump that integrates the pump and motor into a single, sealed unit. This design eliminates the need for a traditional mechanical shaft seal and prevents leaks from occurring in high-pressure, hazardous, or pure fluid applications. Here’s how a canned motor pump operates:

  1. Sealed Construction: The heart of a canned motor pump is its fully enclosed construction. The pump’s rotor (which includes the impeller) is located inside a hermetically sealed canister along with the stator windings of the electric motor. There is no direct contact between the rotating and stationary parts outside this enclosure.
  2. Lubrication: The internal clearances are very tight, and the bearings are either lubricated by the pumped liquid itself or by a dedicated oil system within the canned unit. In some designs, the fluid being pumped cools and lubricates the motor components.
  3. Heat Dissipation: Due to the lack of external ventilation, heat generated during operation must be dissipated through the pumped fluid or via conduction through the motor housing to the surrounding environment. Some pumps may have additional cooling features like cooling jackets or heat exchangers.
  4. Rotation: When power is applied to the motor windings, the magnetic field causes the rotor to rotate. As the rotor turns, it drives the attached impeller, which in turn generates centrifugal force to move the fluid.
  5. Leak Prevention: Since there are no shaft seals, the risk of leaks due to seal failure is eliminated. This makes canned motor pumps ideal for handling toxic, flammable, or expensive fluids where even minute leaks could pose significant risks or losses.
  6. Monitoring: To ensure proper operation and detect any potential issues early on, canned motor pumps often include built-in monitoring systems such as temperature sensors, vibration monitors, and pressure sensors.
  7. Maintenance: Canned motor pumps generally require less maintenance than conventional pumps because they have fewer wearable parts and no shaft seals to replace. However, when repairs are needed, they typically require more extensive disassembly and specialized expertise. 

In summary, a canned motor pump combines the pump and motor in a single hermetically sealed unit, using magnetic forces to drive the impeller while ensuring leak-free operation, making them suitable for demanding and critical applications.

Advantages

Canned motor pumps offer a range of unique advantages over conventional centrifugal pumps, particularly in applications where reliability, safety, and environmental concerns are paramount. Here are some key benefits:
  • Leak-free Operation: The most significant advantage is the elimination of mechanical shaft seals, which are common failure points in traditional pumps. Since canned motor pumps have no external seals, they guarantee zero leakage, making them ideal for handling hazardous, toxic, or expensive fluids that must not be released into the environment.
  • High Reliability: By removing the need for external shaft seals, the risk of pump downtime due to seal wear, leaks, or failure is greatly reduced. This results in increased uptime and overall equipment reliability.
  • Safety Enhancements: Canned motor pumps are often used in critical processes where fluid containment is crucial. In case of an internal failure, the pumped liquid remains contained within the hermetically sealed canister, reducing the likelihood of accidents, fires, or explosions caused by fluid leaks.
  • Low Maintenance: With fewer moving parts and no shaft seals to maintain, these pumps require significantly less maintenance than their counterparts. They also operate with reduced vibration and noise levels, contributing to a longer service life.
  • Efficiency: Due to their compact design and direct coupling between the motor and impeller, canned motor pumps typically exhibit high energy efficiency. Additionally, heat generated during operation can be dissipated through the pumped fluid itself, further enhancing operational efficiency.
  • Temperature Control: In many designs, the fluid being pumped can also serve as a coolant for the motor, providing built-in temperature control that extends bearing life and ensures safe operating conditions.
  • Versatility: Canned motor pumps can handle a wide variety of fluids, from cryogenic liquids to hot, aggressive chemicals, and can work at both high and low pressures. They’re suitable for applications across various industries including nuclear, petrochemical, pharmaceuticals, and food processing.
  • Monitoring Capabilities: Many models come equipped with advanced monitoring systems that detect changes in temperature, vibration, and pressure, allowing early detection of potential issues before they lead to more significant problems.

In summary, canned motor pumps provide enhanced safety, improved reliability, lower maintenance costs, and higher efficiency, making them a preferred choice in environments where leak prevention and process integrity are critical.

Features of SeFluid's Canned Motor Pumps

  1. Air-Free Operation: SeFluid’s canned motor pumps ensure no ingress of external air, making them ideal for vacuum-operated systems and handling liquids that exhibit adverse reactions upon contact with atmospheric air.

  2. Absolute Leak Resistance: These pumps guarantee a completely leak-proof performance, thereby being perfectly suited to convey flammable and explosive fluids, toxic substances, corrosive chemicals, as well as valuable liquids that require absolute containment.

  3. Shaftless Construction for Extreme Conditions: With a shaft-free design, they are tailored for high-pressure environments and can efficiently manage extremely high or low-temperature fluids, as well as those with elevated melting points.

  4. Compactness and Cost-effectiveness: Boasting a space-saving design, these pumps feature small dimensions, light weight, minimal footprint, and reduced installation costs due to their compact construction.

  5. Quiet and Vibration-Dampened Performance: The pumps operate at low noise levels and with significantly minimized vibration, thanks to their fully enclosed structure that does away with the need for cooling fans and external bearings.

  6. Maintenance-Efficient Lubrication: SeFluid’s canned motor pumps do not necessitate the external injection of lubricating fluid, thereby contributing to lower maintenance expenses and increased operational efficiency over time.

Fluid Types Suitable for Canned Motor Pump

Canned motor pumps are versatile and can handle a wide range of fluid types. The suitability of a canned motor pump for a particular fluid depends on factors such as chemical compatibility, temperature, and potential for solids. Here are some fluid types that are generally suitable for canned motor pumps:

  • Corrosive Liquids: Canned motor pumps are often made of materials resistant to corrosion, making them suitable for handling corrosive fluids. This includes acids, alkalis, and other corrosive chemicals commonly found in chemical processing industries.
  • Toxic Liquids: Canned motor pumps are sealed, preventing leakage and making them suitable for handling toxic liquids. This is crucial in industries where the containment of hazardous materials is a priority.
  • Flammable Liquids: Due to their leak-free design, canned motor pumps are suitable for pumping flammable liquids safely. They are commonly used in applications where there is a risk of fire or explosion.
  • High-Temperature Liquids: Canned motor pumps can handle liquids at extreme temperatures, both high and low. This makes them suitable for applications involving hot oils, molten metals, and other high-temperature fluids.
  • High-Pressure Systems: The shaft-free design of canned motor pumps makes them well-suited for high-pressure applications. They can efficiently handle fluids under elevated pressure conditions.
  • Volatile Liquids: Canned motor pumps can handle volatile fluids without the risk of vapor leakage. This makes them suitable for applications involving liquids with a tendency to vaporize.
  • Slurries and Suspensions: Depending on the specific design and construction, some canned motor pumps can handle fluids containing solids, such as slurries or suspensions.
  • Petrochemicals: Canned motor pumps are commonly used in the petrochemical industry to handle various fluids encountered in oil and gas processing, including crude oil, refined products, and petrochemical derivatives.

It’s essential to consult with pump manufacturers and carefully review the specifications of the canned motor pump to ensure it is suitable for the specific fluid and application requirements. The materials of construction, design features, and compatibility with the intended operating conditions are crucial considerations when selecting a canned motor pump for a particular fluid type.

Types

Selection of Type

Choosing the most suitable canned motor pump for a specific application demands meticulous evaluation of multiple critical factors. Here is an exhaustive list of considerations when selecting a canned motor pump:

  • FLUID CHARACTERISTICS: Vital properties to assess include fluid viscosity, temperature range, corrosiveness, abrasiveness, and toxicity; these elements are essential in determining the appropriate type of canned motor pump.
  • MAINTENANCE CONSIDERATIONS: Reflect upon the maintenance needs such as ease of upkeep, cost-effectiveness of spare parts availability, and the expected lifespan of the pump to ensure long-term operational reliability.
  • SAFETY REQUIREMENTS: Evaluate safety aspects that encompass fire or explosion hazards, risk of contamination, and protection of personnel to guarantee a safe operating environment.
  • OPERATING TEMPERATURES: The intended fluid’s temperature range is crucial in identifying the type of canned motor pump with the necessary thermal compatibility.
  • FLOW DEMANDS: Accurately determine the required flow rate to select a pump with the right capacity to meet your process requirements.
  • PRESSURE CONSTRAINTS: Consider the necessary discharge pressure to choose a pump with the correct head to handle the designated system pressure.
  • INSTALLATION PARAMETERS: Account for installation constraints like available space, power supply compatibility, and piping configurations to ensure seamless integration into the existing infrastructure.
  • COST ANALYSIS: Assess the total cost of ownership, including initial investment, energy consumption during operation, and ongoing maintenance expenses to make a financially prudent decision.

Upon thorough contemplation of all the above-mentioned factors, you can confidently identify the canned motor pump that best aligns with your unique needs. Furthermore, it is highly advisable to consult with a reputable pump manufacturer or supplier who can provide expert advice tailored to your specific application, ensuring the optimal selection and deployment of the canned motor pump.

Applications

Canned motor pumps provide numerous advantages, particularly in applications where leaks are unacceptable, high reliability is required, or hazardous materials are being handled. Here are some key applications of canned motor pumps:

  1. Nuclear Power Plants: Canned motor pumps are extensively used in nuclear power plants for circulating coolant in the primary and secondary circuits. They are ideal for handling radioactive fluids because of their leak-proof design and high-reliability features.

  2. Petrochemical Industry: They are used in refineries and petrochemical facilities for pumping highly flammable, toxic, or volatile liquids. The hermetic seal ensures that there’s no risk of ignition due to sparks caused by motor failure.

  3. Chemical Processing: In processes where aggressive chemicals or dangerous substances are involved, canned motor pumps provide a safe transfer mechanism. They prevent leaks that could lead to environmental contamination or safety hazards.

  4. LNG/LPG Handling: In liquefied natural gas (LNG) and liquefied petroleum gas (LPG) facilities, canned motor pumps ensure safe pumping operations without leakage risks due to their robust containment capabilities.

  5. Subsea Applications: Canned motor pumps are utilized in underwater oil and gas exploration, where conventional pumps cannot be used due to depth and pressure constraints. They are designed to operate under high pressures and in challenging marine environments.

  6. Food & Pharmaceutical Industry: For hygienic and clean processes, canned motor pumps are used because they eliminate the risk of product contamination from lubricants or other fluids leaking into the pumped media.

  7. HVAC Systems: High-efficiency canned motor pumps are employed in heating, ventilation, and air conditioning (HVAC) systems for chilled water circulation, especially in critical installations where reliability is paramount.

  8. Waste Treatment: In waste treatment plants, they’re used for pumping hazardous or contaminated liquids safely, preventing leaks that might contaminate soil or groundwater.

  9. Aerospace Industry: Canned motor pumps are used in spacecraft cooling systems due to their compactness, high efficiency, and ability to operate in extreme conditions.

In summary, canned motor pumps find extensive use wherever high levels of safety, reliability, and leak prevention are crucial factors in pump operation. Their unique design allows for operation in environments that may be deemed too risky for standard pumps.

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