Why is it required that the pH of insulation materials should be no less than 8?
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This post was last edited by FORREST_GUMP on 2015-9-17 at 19:29. Why is it required that the pH of insulating materials should be no less than 8? What are the effects if the insulation material is acidic?
The insulation materials used in thermal equipment and pipelines should not have any chemical corrosive effect on metal surfaces. It is generally required that insulation materials be neutral or have a pH value of 7-8 or higher; they must not contain soluble chlorides, and the content of sulfur oxides shall not exceed 0.06%. The materials should be in a dry state before use. Searched online
It doesn’t make sense that carbon steel/stainless steel is resistant to alkalis but not to acids: Q:Q
I didn’t notice that, but I’d like to share another related experience: the unit had a single, all-stainless-steel reboiler that was heated by steam; the steam flowed through the tubes. After more than a year, cracks appeared in various places on the tube sheet. Later, our factory’s specialists said that it might have been due to chlorine ions present in the insulation material. ——After this update, no problems occurred for about another ten years.
That’s true; carbon steel/stainless steel is resistant to alkalis but not to acids
It is mainly for acid resistance, especially against CL- ions. The landlord must believe this
It is mainly related to the requirements of stainless steel for Cl ions
Maintaining a pH level around neutral is beneficial for the equipment and the insulation covering