Problems with balancing the impeller of a centrifugal pump?
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After the impeller of a centrifugal pump is cut, it vibrates; is dynamic balancing or static balancing required, and what are the respective grades?
Please correct me: Generally, it is based on the diameter D of the test piece and the distance b between the two correction surfaces; that is, when D/b ≥ 5, the test piece only needs to be in static balance. Conversely, dynamic balance is necessary. However, depending on the application requirements, if static balance is sufficient to meet the needs of the rotor’s use, then dynamic balance is not required. And if dynamic balance is possible, then there is no need for both static and dynamic balance. Static balance is easier to achieve than dynamic balance, saving effort, time, and cost.
Static balance must be carried out; dynamic balance is performed on the entire rotor, to ISO1940-1 G2.5 standard.
When the impeller moves, it needs to be balanced; for single-stage pumps, the impeller is balanced statically to a precision of G6.3, while for multi-stage pumps, the rotor is balanced dynamically to a precision of G2.5