5. The pump casing is generally cast iron, which is prone to cracks due to mechanical or thermal stress. When the pump is subjected to the impact of cavitation during work or is frozen when the water in the pump casing is not drained in winter, it is also easy to be broken. If the damage is heavy and cannot be repaired, the new pump casing should be replaced.
6. The mouth ring is also called the minus leakage ring or wearing ring. It is one of the most wearable parts in the pump. It can be repaired after wear and can be replaced with new ones. When replacing the new minus leakage ring, the inner diameter of the electric fire pump should be configured according to the outer diameter of the impeller inlet. If the outer diameter of the impeller inlet is worn, the electric fire pump can be turned to eliminate the groove and ellipse, and then the inner diameter minus leakage ring is configured. The outer diameter of the impeller inlet can be turned three times.
7. The bearing bush of the sliding bearing is cast from copper-tin alloy. It has poor wear resistance and is one of the most vulnerable parts for wear and burnout. The bearing bush can be repaired or replaced with new ones. Rolling bearings generally have an average service life of 5,000 hours, but they are improperly installed, have long service life or poor maintenance, and are also prone to wear or damage. In addition to the replacement of the individual parts of the rolling bearing, it is generally necessary to replace the integral part.
We propose that fire pumps should pay more attention to maintenance, which can extend the service life and reduce the cost of use.