Plate heat exchanger is a very effective heat exchange equipment, its application is very wide.
Plate heat exchanger unit plate heat exchanger for the core components are plate heat exchanger plate and sealing gasket.
And the development level of the sealing gasket directly determines the development level of the plate heat exchanger.
Plate heat exchanger seal failure is a very important production failure, so what is the reason for plate heat exchanger seal failure?
Three major factors affecting the seal
1, pressure
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 shock load related.
This is a condition that is not readily apparent to the casual operator.
The instantaneous pressure peaks caused by shocks are often about two times higher than the normal operating pressure.
The rubber gasket installed in the plate heat exchanger is displaced, causing the plate heat exchanger seal to fail.
The sealing of the plate heat exchanger fails.
Because the heat transfer element of this type of device using stainless steel sheet production.
Its sealing rigidity is relatively poor.
At the same time, the perimeter of the seal is very long.
Therefore, the performance of impact resistance than shell and tube heat exchanger low.
2, time
Use or idle equipment for several years.
Seal material aging may affect the reliability of the seal.
So should take advantage of maintenance opportunities to replace the new sealing gasket in a timely manner.
3,Temperature
Rapid changes in temperature can also lead to seal failure.
In the temperature changes quickly, the
Rubber gasket coefficient of linear expansion and elastic deformation and sealing preload will not match.
So that the sealing preload reduced.
The result is that the device is much lower than the rated design pressure.
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, so as to avoid unnecessary losses.
In the process industry equipment, plate heat exchanger is a high security requirements of the equipment, when the gasket is damaged, the appearance of external drip leakage is visible.
Plate heat exchangers are known to drip slightly at first, and in process equipment with high pressure impacts, 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 with the damaged gasket extracted for a temporary emergency.
Then purchase a new rubber gasket and add the plates to achieve the original heat transfer capacity.
During disassembly and assembly of the plate heat exchanger, pay attention to the A-value, which is the clamping size.
