What are the advantages and disadvantages of the canned pump?

First, what is the canned pump used for?

The canned pump is a sealless pump where the pump and the drive motor are enclosed in a pressure vessel filled with the pumping medium. Inside the vessel, there is only a static seal, and a wire pack provides a rotating magnetic field that drives the rotor. This structure eliminates the need for the rotary shaft sealing device found in traditional centrifugal pumps, ensuring complete leak-free operation. Additionally, the manufacturing of canned pumps is not complicated, and their hydraulic end can be designed and manufactured according to the structure typically adopted by centrifugal pumps and relevant standard specifications.

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The canned pump is suitable for conveying corrosive, flammable, explosive, highly toxic, radioactive, and extremely valuable liquids. It is also suitable for conveying liquids under high pressure, high temperature, low temperature, and high melting point conditions. Due to its leak-free guarantee, canned pumps find wide applications in defense, chemical, petroleum, and other industries.

Second, the advantages of the canned pump:

1. Compared with sealed pumps, canned pumps save the trouble of repairing and replacing seals, and they eliminate the need to remove the coupling, resulting in fewer parts and higher reliability.

2. The motor’s fan, without rolling bearings, doesn’t require additional lubricating oil, ensuring stable operation and low noise.

3. A sliding bearing wear monitor can be configured to detect bearing wear.

4. With a compact structure, small footprint, low base and foundation requirements, no coupling alignment issues, easy installation, and low cost, canned pumps require less daily maintenance work and have lower maintenance costs.

5. It can operate without leakage under alternate vacuum system operation or under “vacuum” and “positive pressure” conditions, allowing material transfer from vacuum tanks to other containers under high vacuum conditions.

6. It has a broad range of applications and can meet various working conditions, including high temperature, high pressure, extremely low temperature, and high melting point conditions.

7. Disadvantages of canned pumps:

8. Due to the use of sliding bearings and the lubrication requirements of the conveyed medium, canned pumps are not suitable for conveying media with poor lubricity. Generally, the viscosity range of the medium suitable for canned pumps is 0.1 to 20 mPa.s.

9. The efficiency of canned pumps is usually lower than that of sealed centrifugal pumps. However, in the case of medium and small power, compared with double-end mechanical seal pumps, the latter may have increased power consumption due to the added cooling and flushing system, resulting in similar overall efficiency.

10. During operation, the required flow rate should be higher than the minimum continuous flow rate, as a small flow rate may reduce the efficiency of canned pumps, leading to heat, liquid evaporation, and potential damage to sliding bearings.