Common causes of damage to the gaskets of plate heat exchangers
Plate heat exchanger is a very efficient heat exchange device. Its application range is very wide. It is usually mainly composed of heat exchange plates and heat exchange gaskets. The sealing failure of plate heat exchanger is a very important fault. What are the reasons for the failure of the heater seal? In terms of common problems, there are mainly pressure effects, temperature effects, and time effects.
1. Pressure influence: Leakage occurs when the disassembled plate heat exchanger is used in the rated working pressure. In addition to the quality factors of the device in the manufacturing and assembly, it is generally related to the abnormal impact load in the system. This is It is not easy for ordinary operators to check the situation. The instantaneous pressure peak caused by the impact is often about 2 times higher than the normal working pressure, which displaces the heat exchange gasket installed in the plate heat exchanger, which makes the plate heat exchanger seal failure Because the heat transfer element heat exchanger plates of this type of device are produced using stainless steel thin plates, its sealing rigidity is relatively poor, and the sealing periphery is very long, so the impact resistance performance is better than the shell-and-tube heat transfer The device is low.
2. Time influence: For equipment that has been used or idle for several years, the self-aging of the heat exchanger seal material may affect the reliability of the seal, so the maintenance opportunity should be used to replace the new heat exchanger gasket in time.
3. Temperature influence: rapid changes in temperature can also lead to seal failure. When the temperature changes quickly, the linear expansion coefficient and elastic deformation of the heat exchanger gasket and the seal pre-tightening force will not match, making the seal pre-tightening The force is reduced, resulting in the pressure bearing capacity of the device much lower than the rated design pressure.
