1.Cut off power first to avoid risks before starting workThe first rule before maintenance is to cut off power and relieve pressure. Though it seems common sense, it is often overlooked. Plate heat exchangers operate under high temperature and high pressure. If you disassemble it rashly without releasing internal pressure in advance, you will take huge safety risks. There was once a technician who started maintenance directly, and high-pressure hot water suddenly gushed out, nearly causing an accident. Therefore, make sure to cut off the power supply, reduce pressure and drain residual medium first. This is the primary step to ensure construction safety.
2.Mark the sequence and position when disassembling plates to avoid messy arrangementPlate heat exchangers feature sophisticated plate structures with strict arrangement orders. Once you start disassembly, you must accurately record the position, direction and sequence of every single plate. They cannot be randomly reassembled at will.
If you fail to make marks during disassembly, you will get confused about the installation direction during reassembly, which will cause big troubles. The most common mistake is reversed installation, resulting in reduced heat exchange efficiency or even abnormal operation. Therefore, clearly number all plates before disassembly just like playing chess, so as to ensure perfect matching during reassembly.
3.Avoid rough cleaning of plates to prevent counterproductive resultsPlate cleaning is a key step in maintenance. Many workers opt for convenience and scrape off dirt with steel brushes or hard tools to finish the work quickly, which is just like cracking walnuts with a sledgehammer. Plates of plate heat exchangers are mostly made of thin metal materials. Harsh mechanical cleaning will easily scratch their surfaces. Damaged plates will not only reduce heat transfer efficiency, but also lead to severe leakage failures. It is recommended to use professional cleaning tools for gentle cleaning, and adopt chemical cleaning when necessary. Mild and proper treatment is the right way to go.
4.Install sealing gaskets properly, never let these small rings ruin the overall performanceSealing gaskets are undeniably vital components of plate heat exchangers, serving as the core barrier against medium leakage. Once gaskets become aged or deformed, their sealing performance will drop sharply.
When replacing gaskets, carefully inspect each one. Replace them immediately if there are any signs of damage or aging, and never take chances to reuse worn parts. Besides, ensure all gaskets are fitted in exact positions during installation. Even high-quality gaskets cannot work well if misplaced. Poor gasket sealing is a hidden hazard for heat exchangers.
5.Tighten bolts evenly to avoid unnecessary faultsThough bolts seem to be ordinary parts, they play an essential role in heat exchangers. During reassembly, make sure to tighten all bolts in proper order with consistent force. Random tightening will lead to uneven stress on plates and even cause deformation. It is recommended to fasten bolts diagonally to ensure balanced force distribution.
Meanwhile, control the tightening torque properly. Insufficient tightness will cause poor sealing, while excessive force may damage plates and sealing gaskets. Therefore, bolt fastening requires careful operation and must not be taken lightly.
6.Check dimensions strictly; never let tiny dimensional errors ruin heat transfer efficiencyDimension inspection is another easily overlooked detail during maintenance. All components of plate heat exchangers, including plates, gaskets and bolts, are manufactured with strict dimensional standards. Even slight deviations will affect the normal operation of the equipment. In particular, improper gaps between plates, whether too wide or too narrow, will reduce heat transfer efficiency and may even cause leakage. Hence, use professional measuring tools to check the dimensions of all key parts during maintenance to ensure flawless assembly.
7.Don't forget pressure testing to ensure trouble-free operation
This is the final step. After finishing all maintenance work, do not wrap up work in a hurry. You need to conduct a pressure test to verify the maintenance result. Inject liquid or gas with specified pressure into the equipment and check for leakage or abnormal conditions. Only when everything runs smoothly can the maintenance be fully completed. Though it seems like a final simple procedure, this step is actually crucial, which helps eliminate hidden dangers in advance.
Conclusion: Details determine success or failure, and maintenance is meticulous work
The maintenance of plate heat exchangers is not only a matter of professional skills, but also strict control over every detail. Every minor procedure may affect the overall performance of the equipment.
Therefore, you must pay close attention to those seemingly insignificant details during maintenance to ensure the long-term stable operation of the device.
It should be noted that maintaining plate heat exchangers requires both decisive execution and meticulous care like doing delicate embroidery work. Only in this way can you achieve twice the result with half the effort.
