May. 20, 2021
Common Problems And Treatment Methods Of Impeller
One, cast iron impeller defects
1. Failure performance: flow channel inclusions; fleshy; not smooth; trachoma; cracks; shrinkage, etc.
2. Treatment method: According to the actual situation, grinding, repair welding, and other methods can be used. If the problem is serious, it needs to be scrapped and recast.
1. Failure performance: The picture shows the process of the pump impeller made of gray cast iron being worn by a small amount of cement foam water within 5 years. The wear problem is more caused by improper selection of materials by the designer or improper selection of pumps, or contamination of the process medium.
2. Treatment method: change the impeller material; change the design scheme, change the pump type; check the process medium.
1. Failure performance: improper design scheme; high installation position; improper material selection, etc.
2. Treatment method: lower the installation position; replace more anti-cavitation materials; redesign the pump type, etc.
Four, death surrounded by mouth
1. Failure performance: The design gap is too small; the hardness difference between the front and rear aperture rings is less than 50HBW; there are solid particles in the aperture ring gap; the aperture ring is deformed, etc.
2. Treatment method: increase the design gap; change the material of the mouth ring; check the process medium; replace the new mouth ring, etc.
1. Failure performance: caused by cavitation, corrosion, abrasion; caused by poor casting quality; caused by water hammer.
2. Treatment method: replace the impeller with a new one.
1. Failure performance: improper material selection.
2. Treatment method: replace the impeller with corrosion-resistant and wear-resistant materials; coating the impeller with an anti-corrosion layer; spraying the impeller with the anti-corrosion layer.
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