Canned Pump Information

What is Canned Pump

A canned pump, also known as a canned motor pump, is a type of centrifugal pump. It integrates the pump and the motor into one unit. The impeller of the pump and the rotor of the motor are mounted on the same shaft, and both the pump casing and the motor stator are equipped with a metal shield (canned). This shield separates the pumped medium from the motor parts, preventing leakage of the medium and making the pump suitable for handling toxic, flammable, explosive, and precious media.

History of Canned Pump

The canned pump was first developed in the United States in the 1950s. It was initially used in the nuclear power industry to transport radioactive media. Later, with the development of technology and the increasing demand for environmental protection and safety, canned pumps have been widely used in various fields such as the chemical industry, petroleum refining, and food processing.

Purpose of Canned Pump

Canned pumps are mainly used for transporting various liquids, especially those that require high sealing performance. They are widely used in the chemical industry to transport corrosive and toxic liquids, in the food industry to transport edible liquids, and in the refrigeration industry to transport refrigerants.

Principle of Canned Pump

The working principle of a canned pump is similar to that of a general centrifugal pump. The motor drives the impeller to rotate, generating centrifugal force. This force causes the liquid to flow from the center of the impeller to the periphery, increasing the pressure and velocity of the liquid. The liquid is then discharged from the pump outlet. Meanwhile, due to the rotation of the impeller, a low-pressure area is formed at the pump inlet, causing the liquid to be continuously sucked into the pump.

Features of Canned Pump

• High Sealing Performance: The canned structure effectively prevents the leakage of the pumped medium, ensuring the safety of the operation environment.
• Low Noise: The motor and pump are integrated, and the vibration and noise during operation are relatively low.
• Simple Structure: Compared with traditional pumps, canned pumps have fewer parts and a relatively simple structure, which is convenient for maintenance and repair.
• Good Corrosion Resistance: The canned structure and the use of corrosion-resistant materials make canned pumps have good corrosion resistance.

Types of Canned Pump

• Single-stage Canned Pump: It has only one impeller and is suitable for transporting liquids with low head requirements.
• Multi-stage Canned Pump: It consists of multiple impellers in series and can provide higher heads for transporting liquids over long distances or to high altitudes.
• Magnetic Drive Canned Pump: It uses a magnetic coupling to transmit power, eliminating the need for a mechanical seal and further improving the sealing performance.

Precautions for using Canned Pump

• Proper Installation: Follow the installation instructions carefully to ensure the correct installation of the pump and avoid incorrect installation that may lead to leakage or damage to the pump.
• Regular Maintenance: Regularly check the operation of the pump, including the lubrication of the bearings, the wear of the impeller, and the sealing performance of the canned.
• Monitoring the Medium: Monitor the temperature, pressure, and composition of the pumped medium to ensure that they are within the allowable range of the pump.
• Proper Shutdown: When shutting down the pump, follow the correct shutdown procedures to avoid damage to the pump due to water hammer or other reasons.

Things to consider when purchasing Canned Pump

• Flow and Head Requirements: Determine the required flow and head according to the actual working conditions to select a pump with appropriate parameters.
• Medium Properties: Consider the physical and chemical properties of the pumped medium, such as viscosity, density, corrosiveness, and temperature, to select a pump with suitable materials and sealing structures.
• Power and Speed: Select a pump with appropriate power and speed according to the actual needs to ensure the normal operation of the pump.
• Brand and Quality: Choose products from well-known brands with good quality and after-sales service to ensure the reliability and durability of the pump.

Terms of Canned Pump

Some common terms related to canned pumps include:

• Canned Motor: The motor used in a canned pump, which has a special structure to ensure the isolation of the pumped medium.
• Impeller: The key component of the pump that rotates to generate centrifugal force and transport the liquid.