Maintenance of rubber gaskets in plate heat exchangers

Under normal circumstances, it can be found whether the seal of the heat exchanger has lost its function through the dripping when the Plate Heat Exchanger is running in a cold state or during the cooling process of parking. However, some plate heat exchangers have the function of readjustment, that is, they can When a small amount of dripping occurs, screw the heat exchanger plate group twice to increase the stress between the gaskets and effectively solve the dripping phenomenon in a short time.
In the newly assembled heat exchanger, a larger combined length can be used. When dripping occurs, each group of plate heat exchangers should be tightened. The maximum combined length and the minimum combined length can generally be found on the nameplate of the heat exchanger. see in.
It should be noted that it cannot be smaller than the minimum combined length. When the combined heat exchanger reaches the minimum combined length and still leaks, it means that the gasket must be replaced. The reasons that have an important impact on the service life of the rubber gasket are the working mode of the heat exchanger, the corrosiveness of the heat dissipation medium and the cleaning agent used, the maximum working temperature, the maximum working pressure, due to excessive pressure and uneven pressure However, the stress of the rational gasket is relatively large, and it is naturally aged. If these occur, maintenance and maintenance or replacement should be carried out in time.
The main steps for maintenance and replacement of rubber sealing gaskets are:

It is the inspection and testing of reuse performance. Check the wall thickness of heat exchangers and pipes in the case of suspected corrosion. The second is to remove aging seals. According to different dirt, use acid and alkali for chemical cleaning. The surface of the cleaned parts will not be affected by chemical media. Corrosion damage: second, after chemical cleaning, use a high-pressure blowing device to thoroughly remove the chemical medium remaining on the surface of the plate heat exchanger; fourth, each heat exchanger plate is coated with a fluorescent test agent, and under the irradiation of ultraviolet light Check for small cracks and corrosion holes, and clean again. In addition, it is also necessary to focus on checking the condition of the sealing groove, and repairing if necessary: Fifth, for the adhesive gasket, the residual substances will be completely removed, and the rebonded adhesive will be used to rebond, and the reassembled heat exchanger sheet group Clamp it in a special fixture to cure the adhesive, and heat it in a holding furnace to achieve the best bonding effect.