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1. What is the maintenance cycle for centrifugal pumps in days? (1) Minor cultivation: once every 3 to 6 months ； (2) Major overhauls are carried out every 12 to 18 months. 2. What are the tasks involved in minor repairs of centrifugal pumps? (1) Thoroughly inspect the leakage to identify its cause, and then carry out the necessary repairs. (2) Eliminate leaks from the flanges on the pipeline. (3) Adjust the concentricity of the pump shaft and the motor shaft. (4) Thoroughly inspect the bearings, and repair or replace them promptly if any issues are found. (5) Faulty components must be repaired or replaced. (6) Replace the lubricating oil. Clean the pipelines and equipment of the cooling water system, lubricating oil system, and seal oil system. 3. What are the tasks involved in the major overhaul of a centrifugal pump? (1) All contents of minor repairs. (2) Disassemble the pump, thoroughly inspect all components for signs of wear and corrosion, and then carry out repairs. (3) Inspect the shaft sleeves, bearings, stuffing boxes, pressure-reduction rings, seal oil rings, impellers, etc., and keep records. (4) Check the dynamic and static balance of the rotor. (5) Check the shaft’s concentricity and bending. (6) Check the levelness of the pump body. (7) Based on the inspection and testing results, draw drawings of the relevant components. 4. What are the standards for maintaining centrifugal pump bearings? (1) The ellipticity and shaft diameter taper must not exceed one thousandth of the shaft diameter. (2) Roughness R2 of the shaft diameter surface