Corrosion issues in ethylene glycol aqueous solution pipelines
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When ethylene glycol aqueous solution is used as a refrigerant, how should pipelines and storage tanks be protected from corrosion? The initial concentration of the ethylene glycol aqueous solution in our unit was 28%, and it was later adjusted to 40%. It is acidic, with a pH between 4 and 5; the pipelines experience significant thinning, and smaller pipelines leak. Later, NaOH was added to raise the pH. There have been no pipeline leaks in recent years, but I’m still worried. Please advise
While paying attention, I also encountered such a problem.
Corrosion inhibitors are added, and the pipes are replaced; nowadays, steel-reinforced composite pipes are popular – they are pressure-resistant, corrosion-resistant, lightweight, have a low friction coefficient, and their crystals are easy to clean!
The cost of replacing the pipeline is quite high
Is the pH that low? We use 50% ethylene glycol, and we have encountered such problems as well; especially with hot ethylene glycol, there was a lot of leakage at the welds of the thin-walled pipe elbows. But our pH level was around 7 – could there be an issue? It’s fine to check the corrosion manual as well
We have also been using an ethylene glycol coolant at around 50%, but the situation described by the original poster has never occurred. Could it be that acidic substances seeped in at some point, and the operator restored the pH level without reporting it, which led to corrosion of the pipes?
For pipelines of what diameter can I apply a layer of metal anti-corrosion protection?
Diol itself does not corrode locusts. Rather, it is the acidic substances that are produced as a result of oxidation or decomposition after the diol turns into a solution. So PH will become acidic. This, in turn, causes corrosion of the pipeline. The best approach is to add a corrosion inhibitor to the solution, which can effectively prevent corrosion. 15094401317 Zhang.
Hello! May I ask, are your ethylene glycol pipes made of carbon steel? Has the inner wall of the carbon steel pipe been treated for corrosion protection? Can adding a corrosion inhibitor alone effectively slow down the corrosion of ethylene glycol?
Hello! May I ask, are your ethylene glycol pipes made of carbon steel? Has the inner wall of the carbon steel pipe been treated for corrosion protection? Do you sell this type of corrosion inhibitor?