Some experience from the start-up process

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There were several incidents that occurred during the preparation phase for commissioning the plant; I will explain them below: 1. The heat exchangers in the plant have reached a certain age, for example, 6 years old. At this point, one or two tubes in the tube bundle may start to leak, and the best solution is to replace the entire tube bundle. Because if there are leaks at this point, it indicates that there are more than one area where the thickness has decreased; therefore, for long-term operation, it’s better to replace them. After all, stopping production during normal operations would result in losses that outweigh any benefits ； 2. After the renovation or maintenance of old equipment, especially when it is put back into operation more than 2 months after pressure testing on the heat exchanger, a pressure retention test must be carried out. Once this test is passed, a one-way pressure test is conducted; by one-way pressure testing, it means installing blind flanges or venting on the other side ； Only in this way can the pressure retention during one-way operation be tested ； 3. The heat exchangers of devices that are under maintenance or renovation must be cleaned, no matter how short the time since they were last in use. After all, if the heat exchangers are not cleaned, the air corrosion during the maintenance process will accelerate, to an extent that is unimaginable ； They are all lessons, as well as personal experiences; I hope future generations will take them as a guide!