Steam medium heat exchanger
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A 5 bar steam superheater, with 45 bar steam flowing in the shell side, made of material Q345 (N). The tube train operates with 5 bar steam, and the material is 16Mn(N). Now the shell-side steam has been isolated by the valve, with only 5 bar of steam flowing in the tube side. Is there any potential for corrosion? The shell side is not protected with nitrogen.
In cases where corrosion is a risk, after the shell side is emptied, the absence of nitrogen protection leads to electrochemical corrosion in a humid environment; corrosion becomes even more severe if air gets in.
The pipeline pressure is 1.5 bar of steam, so there should be no humid environment.
As long as there is water in the shell side, corrosion will occur.
The inlet and outlet of the shell side have both been closed with valves.
Was the degree of dryness measured? Does it contain water inside? Can it definitely ensure that the shell side is completely dry?
The absence of water does not mean there is no moisture; the presence of oxygen will cause corrosion!
Hermetically sealed structure, pure water medium, with virtually zero corrosion.