Failure analysis of centrifugal pump impeller blade fracture
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This post was last edited by fyxabcd on 2023-3-17 07:40. Dear sea friends, please help analyze the reason. Suggestions for improvement are welcome. The centrifugal pump in the plant operates with stable vibration during operation. Before the blade broke, there were no fluctuations or adjustments in any parameters; suddenly, the vibration increased and the system stopped operating. The inspection showed that the blade was broken, with no wear on the front or back. Subsequently, tests such as tensile tests were conducted on the impeller material, and it was found to meet the requirements. Have you all encountered similar situations? Please analyze it, thanks! 1. Design reasons, 2. Processing reasons, and so on.
Possible reasons include: 1. Design-related issues: improper blade design, insufficient strength, or inappropriate material selection, etc. It is recommended to reevaluate the blade design and material selection to ensure they are suitable for the working conditions and loads. 2. Reason for failure: The machining precision of the centrifugal pump impeller is insufficient, resulting in an uneven stress distribution across the blades; this causes one of the blades to bear an excessive load and break. It is recommended to improve processing accuracy and strengthen quality control of blade processing. 3. Reason for maintenance: It may be due to the long service life of the impeller, which already has minor cracks; over time, these cracks expand, eventually leading to the breakage of the blades. It is recommended to regularly inspect and replace the impeller. 4. Reason for operation failure: It may be due to external impacts or overload on the impeller during operation, exceeding its tolerance limits. It is recommended to set reasonable operating parameters to avoid overload or external impacts. The above are some possible reasons and suggestions for improvement; the specific reasons need to be analyzed further in light of the actual situation. -
It is recommended to check whether any foreign objects have entered the material; such damage is likely caused by foreign objects entering the pump. For reference.
Judging from its appearance, it should be a high-speed centrifugal pump. This type of pump has high requirements regarding cavitation, as well as the design and material of the impeller.