On the anti-corrosion of gas pipelines
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What kind of anti-corrosion treatment is used for coke oven gas pipelines? Some people say heavy-duty anti-corrosion treatment. After checking, there are several types of such coatings, and it’s not clear which type is actually used by coking companies for this purpose
It is mainly around the ammonium sulfate section; the drawings should provide explanations
The corrosion of gas pipelines is mainly caused by coal tar vapor and various chemical substances present in the gas. Regular cleaning with steam can help reduce the degree of corrosion, and it is also necessary to frequently remove any condensate from within the pipelines
Epoxy coal tar anti-corrosion paint (coating) provides good performance. Compared to chlorosulfonated anti-corrosion coatings, this type of coating is cheaper and easier to apply. The effect is good.
Are you upgrading individual pipes in a new factory or an existing one? I’ve seen that in our factory, for the individual pipes (small pipes), after replacing them with new ones, a layer of high-quality tar is applied to their surface.
Gas pipelines are designed for continuous flow, so it is not possible to clean them regularly with steam. It is essential to pay closer attention to the gas water seals and to ensure that condensate is removed as much as possible.
Using epoxy coal tar anti-corrosion paint works well. However, if the resistance is not high, do not clean it to prevent corrosive substances such as evaporated ammonia and hydrogen sulfide from exacerbating the corrosion of the gas pipelines.
External anti-corrosion treatment is easy; it can be done at any time. Internal corrosion protection is crucial; the drawings should provide instructions.
Apart from the coal gas pipelines at the inlet and outlet of the sulfur amine saturator needing internal anti-corrosion treatment, it doesn’t seem like anything else is required, right?
Yeah, does it have to be done everywhere else too?
Choose polyaniline; it gives good results
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After desulfurization, 304 stainless steel can be used; for ammonia sulfate gas pipelines, 316 stainless steel is required. For heavy-duty anti-corrosion coatings, TT-300 phenol-titanium heavy-duty anti-corrosion paint from Wuhan Guoqi can be used – it is relatively better quality
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