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Two simple steps to teach you how to clean and maintain plate heat exchangers correctly. Plate heat exchanger cleaning can be divided into two types, which are currently the most widely used cleaning methods. One is in-place cleaning and the other is split cleaning. The so-called cleaning in place is CIP, the full English name is Cleaning in place, also called online cleaning. Its advantage is that it does not dismantle the equipment and can extend its service life. For the flushing of plate heat exchangers, chemical flushing is used, and the main method is reverse backwashing. When cleaning, the flow rate of the cleaning liquid is faster than the normal medium flow rate, and it must reach about 1.5 times to be effective. It should be noted that after cleaning, in order to prevent the cleaning liquid from remaining inside the equipment, it must be replaced with clean water until the cleaning liquid is completely discharged. Also, there are many plates made of stainless steel, so be careful not to use hydrochloric acid cleaning agent when cleaning. Finally, when making cleaning solvents, the chlorine content in them must not exceed 0.0003. The other one is split cleaning, which as the name implies is to take apart the plate heat exchanger equipment for cleaning. What you should pay attention to when cleaning is that you must wait for the equipment to cool down completely before disassembling it. Do not disassemble it when it is in a hot state. Furthermore, when cleaning the plates, wipe them gently and do not use strong force or a wire brush, otherwise the plates and strips will be easily damaged. Just like chemical cleaning, after cleaning, the plates and strips must be rinsed again with clean water, because their lower parts are prone to dust, so repeated cleaning is necessary. If the plate is thickly scaled, it must be rinsed separately and then cleaned repeatedly. During this process, attention should be paid to keeping the strips clean during installation, otherwise sealing problems will occur. Finally, the assembly must be carried out in order according to the assembly requirements.