How to Determine if the Impeller and Pump Casing Need Replacement?
The replacement timing for the impeller and pump casing should not be determined solely by fixed operating hours. Differences in medium particle size, solid content, operating point, piping layout, and maintenance condition will all cause component wear rates to vary.
A drop in flow rate is not necessarily caused entirely by impeller wear. Suction clogging, pipeline sedimentation, changes in valve status, speed reduction, increased slurry concentration, and measurement errors can also cause similar issues.
Therefore, it is recommended to first record the flow rate, pressure, current, vibration, medium properties, and operating hours before shutting down the equipment for inspection according to maintenance requirements.
During disassembly and inspection, record the wear locations, remaining dimensions, and damage patterns of the impeller and pump casing. If the same abnormal wear recurs at a specific location, further inspect the pump's operating point, piping layout, wet-end component clearances, rotation direction, and medium conditions.
For continuous operations or overseas projects, it is recommended to prepare impellers, pump casings, liners, shaft sleeves, seals, and other matching spare parts in advance based on historical wear patterns to minimize downtime caused by waiting for replacement parts.
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