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If you want to extend the service life of a plate heat exchanger and maintain stable heat exchange efficiency, it is necessary to carry out regular maintenance and cleaning. So how should heat exchangers be maintained? First is equipment disassembly: 1. The heat exchanger should be cooled before it is disassembled. 2 Measure and record the clamping dimensions of the metal sheet bundle. 3 If there are connecting pipes on the movable compression plate, all bends or shortcuts connected to it should first be removed, so that the movable compression plate can slide freely along the upper guide rod. 4. Alternately and in a diagonal pairing manner, gradually loosen the clamping bolts to ensure the parallel movement of the movable pressing plate. 5 If fluid is observed flowing out of the signal port or leakage occurs during use, it should be addressed promptly. Regarding the cleaning of plate heat exchanger equipment: The first method is CIP online cleaning; chemical cleaning should be carried out with reverse backwashing, and the flow rate of the cleaning liquid should be about 1.5 times that of the normal medium flow rate. After cleaning, rinse with clean water to displace the cleaning solution until it is completely removed. For scale, diluted soda ash or a 5% nitric acid solution can be used ； For alkaline scale, a 5% hydrochloric acid solution can be used. Note: Stainless steel sheets must not be cleaned with hydrochloric acid. When preparing the cleaning solution, the chloride ions in water must not exceed 300PPM. The second method is to disassemble and clean it. 1 Do not open the equipment while the plate heat exchanger is in use for heat exchange. After removing the 2 plates, rinse them with clean water; in particular, the lower parts of the plates and the sealing strips tend to accumulate dust, so they must be cleaned carefully. 3 If there is scaling or a thick layer of organic matter on the plates, remove the plates from the frame, take off the sealing gaskets, and then clean the plates. After drying, install a clean or new rubber strip. 4 When replacing the sealing strip or gasket, rotate the gasket by a certain angle before removing it. Do not force disassembly or assembly to avoid damaging the plates. 5 When using mechanical cleaning methods, brushes or fiber brushes should be employed; the use of metal brushes such as steel or copper wires is strictly prohibited. 6 When reassembling, check whether the plates are arranged correctly, and proceed slowly.