Corrosion in Heat Exchanger

There are 4 main reasons that cause corrosion in heat exchangers to need to be concerned during the inspection: Water impingement, Temperature, Vibration, Velocity.

Refer to: Typical location of Corrosion on Heat Exchanger

Cooling Water Corrosion in Heat Exchanger Tubes at High Water Temperature Zone;

Another important factor affecting Corrosion in Heat Exchanger Tube Service at Cooling Water is the temperature.

The area where the Cooling Water has a high temperature ( on the Outlet side ), there will be more fouling and corrosion than the low-temperature area. In the example, you can see from the corrosion that occurred in front of the Tube-sheet Channel, and the results of the IRIS as below:

Heat exchanger corrosion

Will find that the Cooling Water Outlet or the Cooling Water with the highest temperature will cause the most severe Cooling Water Corrosion.

Heat exchanger corrosion 1

Cooling Water Corrosion in Heat Exchanger Tubes due to Low Flow Velocity; 

For Heat Exchanger that uses Cooling Water to exchange heat with Process Fluid, the Cooling Water runs on the Tubeside side, where the Tubes have a low-velocity flow of cooling water (<1 m/s), often sediment (sedimentation) and scale (fouling), and cause the area to be more corrosive.

Heat exchanger corrosion 2

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