Plate heat exchanger is a very effective heat transfer equipment, its application is very wide, the core components of the plate heat exchanger is the metal plate plate and sealant gasket. The development level of the sealing pad directly determines the development level of the plate heat exchanger, plate heat exchanger seal failure is a very important production failure, so what are the reasons for plate heat exchanger seal failure?
Summarised as follows: there are mainly pressure effects, temperature effects and time effects.
1. Pressure effect
Removable plate heat exchanger in the rated working pressure inside the use of leakage, in addition to the device in the manufacture of assembly quality factors, generally and the system inside the abnormal impact load related to this is not easy for ordinary operators to view the situation, the impact caused by the instantaneous pressure peaks are often higher than the normal working pressure of about 2 times, so that the installation of plate heat exchanger inside the rubber sealing gasket displacement The sealing failure of the plate heat exchanger, because the heat transfer element of this type of device using stainless steel sheet production, it is relatively poor sealing rigidity, while the sealing of the periphery is very long, so the performance of the impact resistance than the shell and tube heat exchanger is low.
2. Time impact
Use or idle for several years of equipment, sealing materials of their own aging may affect the reliability of the seal, so you should take advantage of the maintenance opportunity to replace the new sealing gasket in a timely manner.
3.Temperature influence
Rapid changes in temperature can also lead to seal failure, in the temperature changes very quickly, the rubber gasket coefficient of linear expansion and elastic deformation and sealing preload will not match, so that the sealing preload is reduced, resulting in the device bearing pressure than the rated design pressure is much lower.
The above three factors are the main reasons for seal failure, seal failure occurs, should be investigated as soon as possible to solve the problem, to avoid unnecessary losses.
In process industry equipment, plate heat exchanger is a kind of equipment with high safety requirements, and when the gasket is damaged, the external drip leakage is visible. Plate heat exchangers all have slight dripping leaks to begin with, and in process equipment with high pressure shocks, larger leaks can occur due to gasket damage. Under strong pressure shocks, the gasket can sometimes be moved out of the correct installation position of the plate heat exchanger, and in severe cases, even dislodged from the heat exchanger. In this case, immediately stop the work of the equipment, so that the heat exchanger in the absence of pressure to cool down to room temperature. If the gasket has been deformed under the action of the pressure shock, it cannot be restored to its original shape and position and has to be replaced with a new one. If no spare gasket is available, remove the plate pieces on both sides of the damaged gasket from the entire plate heat exchanger set, and then inspect the gasket bonding surface of the remaining plate heat exchanger plates. Assemble the plate pieces after extracting the damaged gasket. The plate heat exchanger unit is then purchased with a new rubber gasket and the plates are added to achieve the original heat exchange capacity. The process of disassembling the plate heat exchanger should pay attention to the A-value, which is the clamping size.
