Seeking advice on the corrosion allowance for heat exchanger tube bundles
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As the title suggests, our facility has a heat exchanger with a corrosion allowance of 2 mm and a design life of 10 years. The wall thickness of the heat exchange tubes used is 2 mm, made of 10# steel. I have a question: if, after ten years, 2 mm of corrosion occurs in the shell side, does that mean the tube side has also been completely corroded? Please ask a professional to answer. I am extremely grateful.
During design, corrosion allowance for the tube bundle is generally not taken into account, and the design life is usually specified without including the tube bundle; however, if the medium does cause such severe corrosion, that will still be a problem
Heat exchange tubes do not take corrosion allowance into account. If corrosion is severe, material selection should be considered.
The design of heat exchangers generally specifies that the design life does not include the heat exchange tube bundle nor the weld joints between the heat exchange tubes and the tube sheet. Moreover, the design of heat exchange tubes generally does not include a margin for corrosion; if corrosion is severe, it is necessary to replace the material or the tubes themselves.
The heat exchange tubes are not provided with a corrosion allowance, and they can be replaced throughout the entire lifespan of the heat exchanger...
The shell of the heat exchanger design takes corrosion allowance into account. The management only considers corrosion-resistant materials, as the lifespan of the heat exchanger does not include the tube sheet.
The design concept should be updated; if the heat exchange tubes need to be replaced every 2–3 years, and such replacements are very troublesome； Because, under normal factory conditions, welding heat exchange tubes is quite difficult; it becomes even more challenging for operating companies to carry out repairs or replacements, as issues such as oxidation and corrosion of the tube sheets also exist. For the heat exchange tube design, an appropriate service life of around 8 years should be taken into account, with replacements required twice during that period.
Does the service life of the heat exchanger include the tube bundle? Where exactly are the regulations or statements?