What is the difference between a canned motor pump and a magnetic drive pump? Where is it suitable for use?

1. Shielded pumps are expensive. 2. Shielded pumps can ensure very good sealing performance, whereas magnetic pumps cannot. 3. The best shielded pumps available in China can only reach around 10 MPa, whereas magnetic pumps can achieve higher pressures. 4. The flow rate of the best shielded pumps available in China is not particularly high; I’ve forgotten the exact figure, while magnetic pumps can achieve very high flow rates. Summary: 1. Shielded pumps are definitely more advanced and safer than magnetic pumps ； 2. If you have the budget, a canned motor pump is definitely the best choice. Regarding the original poster’s question, canned pumps are generally used in high-risk media and operating conditions such as liquefied hydrocarbons or high-temperature and high-pressure oil and gas. If the medium is of moderate hazard and the operating conditions are not severe, it is more reasonable to choose a magnetic pump.

There is a table on page 947 of the Chemical Process Design Manual, comparing magnetic pumps and shielded pumps