Temporary treatment method for plate heat exchanger gasket aging

Temporary treatment method for plate heat exchanger gasket aging

The softening of the elastic gasket is related to pressure and temperature. When the gasket loses its elasticity, the heat exchanger will leak. In some products, in order to solve the dripping phenomenon caused by the aging of the sealing gasket, it is allowed to adjust the sealing performance of the heat exchanger, that is, tighten the bolts of the combined plate heat exchanger again to adjust the elastic sealing gasket between each heat exchanger The pressing force can solve the dripping problem. On the nameplate of the heat exchanger with this function, the maximum and minimum allowable stress are generally given. For new heat exchanger fins, the smallest allowable stress should be used for connection and fixing. Depending on the number of heat exchanger plates in each group, the tightening force of the heat exchanger can be adjusted one or more times. Each time the nut is tightened, the nut can be screwed into 3mm, and always pay attention to the stress of the adjusting plate during the tightening process, and , Only allow the heat exchanger without working pressure to adjust the tightening force at room temperature to prevent dripping.

For plate heat exchangers that do not give the stress adjustment range on the nameplate, the stress value is generally given in the parts drawing. When tightening this type of plate heat exchanger, the tightening torque should not be lower than the value specified in the drawing. Because it is related to the assembly quality and assembly deformation of the plate heat exchanger. When the tightening torque reaches the required value, the elastic gasket can be replaced in a planned way. For plate heat exchangers used in important production equipment and corrosive media, it is recommended to have a set of spare seals. When the warehouse temperature is 18℃, the seals of the plate heat exchanger can be stored for about 3 years in the transparent plastic packaging.

　　The fixing of the seal:

　　 In principle, the fixing of seals is divided into two categories: adhesive fixing and non-adhesive fixing. The shape of the gasket should be consistent with the shape of the seal of the plate heat exchanger. It must be pointed out that the adhesive fixing method does not have any effect on the sealing function.