Plate heat exchanger is a very efficient heat exchange device, which has a wide range of applications. It is mainly composed of plates and gaskets. Plate heat exchanger seal failure is an important failure. What causes damage to the gasket of the plate heat exchanger?
(1) Influence of pressure. Leakage occurs when the plate heat exchanger is used in the rated working pressure. In addition to the quality factors of the device in terms of manufacturing and assembly, it is generally related to the abnormal shock load in the system. This is a situation that is not easily viewed by ordinary operators.The instantaneous pressure peak caused by the impact is often about 2 times higher than the normal working pressure, which causes the rubber seal installed in the plate heat exchanger to be displaced and the plate heat exchanger seal to fail. Because the heat transfer element of the plate heat exchanger is made of stainless steel thin plate, its sealing rigidity is relatively poor, and the periphery of the seal is very long, so the impact resistance performance is lower than that of the shell and tube heat exchanger.
(2) Temperature influence. Rapid temperature changes can also cause seal failure. When the temperature changes very quickly, the linear expansion coefficient and elastic deformation of the rubber seal and the seal pre-tightening force will not match, making the sealing pre-tightening force drop. The pressure bearing capacity of the heat exchanger is much lower than the rated design pressure.
(3) Time influence. If the equipment is used or left unused for several years, the self-aging of the sealing material may affect the sealing reliability. Therefore, you should use the maintenance opportunity to replace the new gasket in time.