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Before operating the plate heat exchanger, you must thoroughly remove any foreign matter (eg, welding slag, mud, stone, sand, cloth, vinyl, etc.) inside the piping. If these foreign substances are introduced into the heat exchanger, the surface of the heat plates are damaged, or the flow path is closed to prevent the fluid from flowing, thereby reducing the heat exchange efficiency and increasing the pressure loss.
In addition, start the pump with the closed valve located at the front of the heat exchanger before starting the pump, and then slowly open the valve to prevent physical shock such as water hammering in the heat exchanger. Sudden valve opening causes damage to the heat exchanger.
After the pump is started, the air in the heat exchanger must be completely removed by using a vent valve located at the front and rear nozzles. If air is present in the heat exchanger, this will result in reduced heat exchange efficiency.
When the heat exchanger is stopped, slowly close front-end valve of the heat exchanger and stop the pump. Sudden stopping the pump may cause internal vacuum depending on the heat exchanger installation position, which may damage the heat plates.
There is a high probability that fouling / scale has occurred on the heat transfer plates of the heat exchanger.
The plate heat exchanger has a structure that can be easily disassembled. Therefore, after disassembling the product, remove the contaminants by using high-pressure water jet or chemical cleaning solution (CIP).
If the inside of the pipe is not sufficiently flushed before operation of the heat exchanger, there is a possibility that the foreign matter blocks the flow path and the heat exchange efficiency is lowered.
There are several causes.
First, make sure that it is tightened to the assembly dimension. Assembly dimensions are shown in the drawing and must not be tightened less than the minimum assembly dimensions. If it is tightened less than the minimum assembly dimensions, it may cause permanent damage to the heat plate.
Secondly, if there is gasket damage, it can be the cause of leakage to the outside. In this case, the damaged gasket must be replaced after opening the heat exchanger. In addition, if there is foreign matter in the gasket, it can be the cause of leakage.
Third, the damage of the heat plates. Repeatedly tightening and loosening the heat exchanger several times may cause deformation of the heat plates. In this case, the heat plates and gaskets must be replaced after opening the heat exchanger.
Damage to the heat exchanger hanger can also cause leaks rarely. In addition, leakage may occur even if the heat plates are not assembled suitably.
If there is perforation on the heat plate, the fluids can be mixed. This occurs mainly when the heat exchanger heat plate material is erroneously selected and corroded or when a fluid other than the original design is introduced during operation.
If there is a perforation on the heat plates, the heat exchanger must be opened to remove the damaged heat plates. In this case, you can replace the defective heat plates if you have the spare heat plates, but if you don’t have the spare plates, temporarily remove the defective heat plate with a before or after plate immediately (always remove the even number of heat plates). Of course, this can be done for a short period of time, but you need to purchase and install additional heat plates for complete resolution.
In addition, the sudden increase in operating pressure may cause the gasket to escape. In this case, the careful operation must be performed so that the operating pressure does not rise. Once the gasket is out from the position, open the heat exchanger and replace the gasket of the out position. You can get a better effect by attaching using gasket exclusive bond when repositioning.