Common failures of plate heat exchangers-part2

Plate heat exchanger fluid flow: The main feature is that the medium on the higher pressure side is strung into the medium on the lower pressure side, and abnormal pressure and temperature will occur in the system. If the medium is corrosive, it may also cause the corrosion of the gasket of the plate heat exchanger, and the leakage usually occurs in the diversion area or the second sealing area.

Causes of liquid leakage in the plate heat exchanger:

1. Due to improper selection of plates, cracks or perforations are caused by corrosion of plates.

2. The operating conditions do not meet the design requirements.

3. The residual stress after cold stamping of the plate and the clamping size during assembly are too small to cause stress corrosion.

4. There is a slight leakage at the plate leakage groove, which causes the harmful substances in the medium (such as C1) to concentrate and corrode the plates, forming a string of liquid.

Treatment method for string liquid of plate heat exchanger:

1. Replace the cracked or perforated plate, and use the light transmission method to find the crack of the plate on the spot.

2. Adjust the operating parameters to meet the design conditions.

3. When the heat exchanger is repaired and assembled, the clamping size should meet the requirements, not as small as possible.

4. The plate material of the plate heat exchanger is reasonably