Analysis of common causes of plate heat exchanger gasket damage
Plate heat exchanger is a very efficient heat exchange device with a wide range of applications. It is usually mainly composed of heat exchanger plates and heat exchanger gaskets. The sealing failure of plate heat exchangers is a very important fault. What are the reasons for the failure of the heat exchanger 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 exchanger gasket installed in the plate heat exchanger and makes the plate heat exchanger seal failure Because the heat transfer element of this type of device is made of stainless steel sheet, its sealing rigidity is relatively poor, and the sealing periphery is very long, so the impact resistance performance is lower than that of the shell-and-tube heat exchanger.
2. Time influence: For equipment that has been used or idle for several years, the self-aging of the heat exchanger gasket 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 cause the sealing failure of the heat exchanger gasket. When the temperature changes rapidly, the linear expansion coefficient and elastic deformation of the heat exchanger gasket and the sealing pre-tightening force will not Matching reduces the pre-tightening force of the seal, causing the device to bear much lower pressure than the rated design pressure.
