Differences between open, semi-open, and closed impellers
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What are the differences in flow rate and head parameters among open, semi-open, and closed impellers? What are their respective scopes of application?
Theoretically, open/semi-open impellers should have higher efficiency than closed impellers, as they have two or one less disk loss. However, in actual production, since the machining precision of open impellers and semi-open impellers is often difficult to ensure, the efficiency of open impellers is generally lower than that of closed impellers, and the level of assembly has a significant impact on their performance. Open impellers and semi-open impellers are easy to clean due to the absence of front and rear cover plates, and they are suitable for liquids containing solid particles, fibers, suspended solids, and substances that tend to crystallize. There is no need to use the operating conditions of open and semi-open impellers; it is better to use closed impellers.
I think it mainly depends on the operating conditions to choose the impeller type, right?:o