If the spiral steel pipe for water transportation is to transport tap water or drinking water, the inner wall is generally made of IPN8710 non-toxic anti-corrosion coating, and the outer wall is made of epoxy coal pitch anti-corrosion. Of course, it can also be coated with internal and external plastic anti-corrosion, or TPEP anti-corrosion, which can be applied to drinking water. Pipes, do not change water quality.
If the spiral steel pipe for water transportation is used to transport sewage or industrial water, generally the inner and outer walls only need to be epoxy coal pitch anti-corrosion. It is cheap, easy to construct, and has a strong waterproof and moisture-resistant effect. Of course, if you don’t mind the cost, you can also use a plastic coating or tpep anti-corrosion.