Why Does Stainless Steel Heat Exchanger Tubing Produce Water Scale?

With the long-term use of stainless steel heat exchanger tubings, some water scale will inevitably occured, Why does scale form? I sorted it out and found that there are these reasons.

Water Scale, before and after
  1. Crystallization scale

The inorganic salt dissolved in the fluid crystallizes on the surface of the heat exchanger tubing to form a deposit. Its principle is the same as that of scale in real life. It will precipitate out when it is too thick or cooled.

  1. Chemical reaction scale

The fouling produced by the chemical reaction on the heat transfer surface of the heat exchanger tube. Generally speaking, the stainless steel heat exchanger tubing does not participate in the reaction, but it becomes a kind of catalyst for the chemical reaction to a certain extent.

  1. Corrosion scale

Some corrosive fluids or fluids containing corrosive impurities corrode the surface of the passing heat exchanger tubings and produce scale.

I believe you have seen many phenomena such as crystallization, chemical reaction and corrosion in your daily life. Therefore, the reasons for the water scale of stainless steel pipes must not be difficult for everyone to understand.

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