The main reason for the loss of sealing effect of plate heat exchanger rubber gasket

The main reason for the loss of sealing effect of plate heat exchanger rubber gasket

Plate heat exchanger is a very efficient heat exchange equipment, and its application is very wide. The core components of plate heat exchanger are plate heat exchanger plates and sealing rubber gaskets. The development level of the sealing rubber gasket directly determines the development level of the plate heat exchanger. The sealing failure of the plate heat exchanger is a very important production failure. So what is the reason for the sealing failure of the plate heat exchanger? Summarized as follows: there are mainly pressure effects, temperature effects and time effects.

　　1, pressure influence

When the detachable plate heat exchanger is used in the rated working pressure, leakage occurs. In addition to the quality factor of the device in the manufacturing and assembly, it is generally related to the abnormal impact load in the system, which is not easy for ordinary operators. 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 rubber gasket installed in the plate heat exchanger, which makes the plate heat exchanger seal failure, because this type of device The heat transfer element 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 sealing material may affect the reliability of the seal, so the maintenance opportunity should be used to replace the new gasket in time.

　　3, temperature influence

Rapid changes in temperature can also cause seal failure. When the temperature changes quickly, the linear expansion coefficient and elastic deformation of the rubber gasket and the seal pre-tightening force will not match, which reduces the pre-tightening force of the seal and causes the device to bear pressure. The performance is much lower than the rated design pressure.

　　 The above three factors are the most important reasons for seal failure. When a seal failure occurs, the cause should be found out as soon as possible to solve the problem to avoid unnecessary losses.

　　In the process industry equipment, the plate heat exchanger is a kind of equipment with high safety requirements. When the gasket is damaged, the external leakage is visible. The plate heat exchanger will have slight leakage at the beginning, and in the process equipment with a large pressure shock, a large leakage may occur due to the damage of the gasket. Under strong pressure shock, the gasket can sometimes be removed from the correct installation position of the plate heat exchanger, or even out of the heat exchanger in severe cases. In this case, the equipment must be stopped immediately, and the heat exchanger can be cooled to room temperature without pressure. If the gasket has been deformed under the action of the pressure shock, it cannot restore its original shape and position and must be replaced with a new gasket. If there is no spare gasket, the plates on both sides of the damaged gasket must be removed from the entire plate heat exchanger group, and then the gasket joint surfaces of the remaining plate heat exchanger plates must be inspected. Remove the damaged rubber pad and assemble it. Then buy a new rubber pad and add the plates to achieve the original heat exchange capacity. When disassembling the plate heat exchanger, pay attention to the A value, which is the clamping size.