Plate heat exchanger with gaskets: knowledge and selection of gaskets

Release time:

2020-08-17 16:39

Source:

When customers choose gasket plate heat exchangers, they can design the temperature based on the material properties, operating conditions, and working pressure of the heat exchanger. The following points should be noted when selecting a heat exchanger:

1. We should ensure that the side with the lower heat transfer coefficient has a larger flow rate, and maintain the same heat transfer coefficient on both sides of the heat transfer surface of the two fluids to increase the heat transfer coefficient. The temperature at the outlet pressure of the heated heat exchanger should be lower than the operating temperature of the secondary water pump.

2. The fluid entering the heat exchanger should pass through filtering equipment to ensure that the contained silt and dirt cannot enter the heat exchanger.

3. When selecting a gasket plate heat exchanger, the flow rate at the inlet of the fluid at the end with the smaller temperature difference should be smaller so that the required design pressure can be met.

4. Based on the pressure and temperature of the fluid used by the user, the customer can freely choose which heat exchanger to use, whether it is a detachable or welded heat exchanger?

5. Avoid selecting plates with an excessively small single plate area. If the number of plates in the heat exchanger is too large, the flow rate between the plates will be too small, and the heat transfer coefficient will decrease.

The main components of a gasket plate heat exchanger are the heat transfer plates and the sealing rubber gaskets. The sealing performance of the rubber gaskets will directly affect the use of the heat exchanger. Once the rubber gasket of the plate heat exchanger loses its sealing effect, it will directly lead to the equipment stopping operation. Rubber gaskets are mainly affected by pressure, time, and temperature.

1. Pressure

In addition to quality factors generated during manufacturing, leakage in plate heat exchangers during normal operation is usually related to abnormal impact loads within the system. The pressure peak generated during impact is relatively high. The rubber gasket in the plate heat exchanger shifts, causing seal failure.

2. Time effect

After several years of use or idleness, the gasket plate heat exchanger's sealing material will begin to age due to its own reasons, affecting its own sealing reliability. Therefore, new sealing gaskets should be replaced regularly. Annual inspection

3. Temperature effect

Temperature changes in the gasket plate heat exchanger can also cause the sealing rubber gasket to become unusable, and the sealing pre-tightening force will decrease.

The above are the main reasons for the sealing effect of the rubber gasket of the gasket plate heat exchanger. When seal failure of the rubber gasket is found during normal use, the cause should be found as soon as possible, and then targeted measures should be taken to avoid losses.

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