Method of checking and accepting the repair effect of plate heat exchanger_
Method of checking and accepting the repair effect of plate heat exchanger
569 Generally speaking, after long-term use of plate heat exchangers, some problems will inevitably occur. If you want to troubleshoot as soon as possible, you must seek the help of professional maintenance personnel. How to judge the maintenance of the plate heat exchanger? You can take the following methods to check and accept the repair effect of plate heat exchangers: Hydrostatic test: Newly installed equipment and heat exchangers that have been disassembled for repair or plate replacement should be re-hydrostatically tested. Water for hydrostatic test, water temperature ≥5℃. The hydraulic test is carried out on one side. When the test pressure is ≤0.1MPa, the pressure is slowly increased to the specified pressure. Hold the pressure for 30 minutes, and no leakage is qualified. When the test pressure is greater than 0.1MPa, slowly increase the pressure to one-half of the specified test pressure. After the pressure is maintained for 10 minutes, release the pressure. Change to the other side, slowly increase the pressure to one-half of the test pressure, and hold the pressure for 10 minutes , Then slowly increase to the specified pressure, hold the pressure for 30 minutes, release the pressure and try the other side again, slowly rise to the specified test pressure, and hold the pressure for 30 minutes without leakage as qualified. The hydraulic test pressure is 1.25 times the design pressure. If leakage is found, press it for another 2 to 3 mm and try the pressure again according to the specific situation. Precautions for the acceptance of the maintenance effect of the plate heat exchanger: The air in the equipment must be drained before boosting; no overpressure test is allowed; the nuts should be evenly tightened; it is forbidden to compress the plate in the equipment with a L value less than Lmin. Precautions for starting the plate heat exchanger: carefully check whether the inlet and outlet pipelines and switches of the plate heat exchanger meet the requirements before driving, and whether the compression size between the two plates meets the specified value. Turn on the outlet of the plate heat exchanger, then turn on the inlet of the equipment, slowly increase the pressure and temperature, in order to stabilize the operation, adjust the fluid on both sides as much as possible. According to the inlet and outlet pressure and temperature instructions, the valve is opened to the predetermined process parameters to maintain stable operation. Precautions for the operation of the plate heat exchanger: During the operation, the pressure should be stable to avoid fluctuations. During operation, if leakage is found, the pressure should be compensated and tightened for 2 to 3 mm in the pressure relief state before operation. When using over 150°C or corrosive and flammable media, it is recommended to add thin iron protective covers on both sides of the plate bundle to prevent injury and heat loss. The above are several practical methods for checking and accepting the repair effect of plate heat exchangers. I hope it will be helpful to you. As a professional plate heat exchanger repair manufacturer, Diguang Heat Transfer Technology Co., Ltd. can solve various problems of equipment for users. If you have any needs, please feel free to contact us. Diguang will serve you wholeheartedly!