As water supply enterprises continue to introduce market mechanisms in depth, water supply enterprises will pay more attention to economic benefits. Now it is time to use the pump, we should be careful when using the pump light pump energy, less water or even mention the four small faults. First, the pump surface and pressure chamber (also known as volute) uneven inner surface rust. If the surface roughness, it will pump the pump to reduce water 7% - 8%. When repairing, just smooth with steel brush and iron sandpaper or grinding wheel, so that the pump can reduce fuel consumption or power consumption by 9% - 14%. Pump performance curve Second, the seal ring gap increases. Test results show that when the pump in the impeller radial clearance increases 4 mm, the pump water pump will be reduced by 10%. When repairing, it only needs to use organic adhesive and asbestos thread to restore to the clearance specified by the factory so as to reduce 10% - 12% of the fuel consumption or power consumption of pump water during work. Third, the pressure chamber and the impeller axis do not coincide. According to the test, when the pressure chamber of the pump water deviates from the axis of the impeller by 2 mm or the declination angle is greater than 2 degrees, the pumping capacity of the pump water will be reduced by 5% - 6%. Maintenance, only careful measurement, carefully identify the axis of coincidence installed firmly installed, the pump can work in the oil or electricity consumption by 6% - 7%. Fourth, the blade installation angle is inconsistent. Pumping water pump volume will be reduced by 5% when pump blades are installed at different angles. Overhaul, with the amount of angle gauge, the installation of firmly fixed position, you can pump at work, the fuel consumption or electricity consumption by 5% - 6%.