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This post was last edited by wx_Us4WS on 2022-8-2 09:37. Cleaning is an important part of pump repair work, and the quality of cleaning has a significant impact on the quality of the repair. Using the correct cleaning methods to improve cleaning quality and reduce costs is one of the issues that repair workers must take into consideration. Cleaning during repair work includes cleaning the exterior of the machinery as well as cleaning the components. Component cleaning can be further divided, depending on the purpose, into cleaning before inspection, cleaning before assembly, and cleaning as a preparatory step before coating or bonding the components. In the cleaning of water pump components, the cleaning requirements for plated covers and bonded components are the highest, yet the quality of cleaning is not good. This is often the cause of coating or bonding failures, and the quality of cleaning during component assembly has a significant impact on the service life of machinery. Due to inadequate cleaning, large amounts of abrasives can penetrate into important friction pairs, or dirt can block the lubrication channels, leading to premature wear and accidental damage of the machinery – a situation that occurs from time to time in some informal repair work, and which must be taken seriously. The following are the steps for cleaning various components of a centrifugal pump: scrape off the scale and rust accumulated on the inner and outer surfaces of the impeller, as well as on the sealing rings and bearings, and then clean and blow them away using water or compressed air. Clean the oil deposits and rust accumulated on all the mating surfaces of the water pump housing. Clean the water seal tube and check whether it is unobstructed; clean the shaft bearings and bearings as well, removing oil residues, and then clean the oil rings and oil level gauges, etc. Ball bearings should be cleaned with gasoline. Parts and components that are not assembled for the time being should be coated with oil for protection after cleaning. The cleaning process should follow these steps: 1. Depending on the processing requirements, some components need to be polished, with no machining burrs or similar defects on their surfaces ； 2. All components are degreased ； 3. After degreasing, carry out pickling and passivation (the cleaning agent contains no phosphorus) ； 4. After pickling and passivation, rinse thoroughly with pure water to ensure no residues of chemicals remain (this step is unnecessary for carbon steel components) ； 5. Dry each component individually using non-woven fabric, ensuring that no fibers or similar residues remain on the surface, or dry it with clean nitrogen gas ； 6. Wipe each component with non-woven fabric or precision filter paper dipped in analytically pure alcohol until no dirty stains remain. The basic principle of cleaning is that all cleaning methods must take full account of the following fundamental requirements: 1) Ensuring that the required level of cleanliness for the parts is met; when repairing water pumps, different components have varying requirements regarding cleanliness. In assembly, the cleaning requirements for mating parts are higher than those for non-mating parts; moving mating parts have higher requirements than stationary mating parts, and precision mating parts have higher requirements than non-precision mating parts. For the surfaces of workpieces that are sprayed, coated, or bonded, high cleaning standards are required. When cleaning, different cleaning agents and methods must be used according to various requirements in order to ensure the desired level of cleanliness. This is especially important for high-temperature magnetic pumps and insulated magnetic pumps that are used for transporting chemical substances. 2) Prevent corrosion of parts; any degree of corrosion is not allowed in precision parts. Choose reputable products; in particular, when it comes to air-operated magnetic pumps, it is necessary to select manufacturers of such pumps from reliable sources. When the pump parts have been cleaned and need to be stored for a while, attention should be paid to the rust-preventing properties of the cleaning solution, or other rust prevention measures should be considered. 3) Ensure safe operation to prevent fires, harm to human health, and environmental pollution.