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How to Do the Internal and External Anti-corrosion of Spiral Steel Pipe?

Date:2021-06-07    keywords: internal and external anti-corrosion, spiral steel pipe

The internal and external anti-corrosion practices of spiral steel pipes (SSAW) should meet the requirements of the design institute and the owner. Generally, the internal and external anti-corrosion process of spiral steel pipes is as follows: base surface treatment, rust removal, welding slag → allocation of paint → intermediate paint → brush or spray construction → maintenance, no The anti-corrosion properties of spiral steel pipes are different in different application scenarios. The indexes of the internal and external anti-corrosion coatings of spiral steel pipes used for drinking water should meet the testing requirements of the Ministry of Health of the State for the hygiene and safety of drinking water.


anti-corrosion spiral steel pipe


1. Classification of external anti-corrosion practices for spiral steel pipes


(1) Indoor and outdoor exposed steel pipes and fittings
Use ordinary grade anti-corrosion. After the pipe surface is derusted and cleaned up, brush two coats of H53-22 epoxy iron red anti-rust primer and two coats of IPN8710-2C anticorrosive top coat.

(2) Indoor concealed steel pipes and fittings
Use ordinary grade anti-corrosion. After the pipe surface is derusted and cleaned up, brush two coats of H53-22 epoxy iron red anti-rust primer and two coats of IPN8710-2C anticorrosive top coat.

(3) Steel pipes and fittings buried and immersed in water (non-pipe jacking construction)
Adopt special reinforced anti-corrosion. After rust-removing and cleaning the surface of the pipeline, one IPN8710-3 anti-corrosion primer, three IPN8710-3 thick-build anti-corrosion topcoats, two layers of glass fiber cloth in the tundish.

(4) Special steel pipe for jacking pipe
External anti-corrosion: After rust-removing and cleaning the surface of the pipeline, two coats of H53-22 epoxy iron red anti-rust primer and two coats of H52-19 epoxy glass flake anticorrosive top coat are applied.

2. Classification of internal anti-corrosion practices for spiral steel pipes

(1) Anti-corrosion in pipelines for drinking water
After removing the dirt and rust spots on the inner wall surface and wipe it clean, brush two coats of IPN8710-2B anticorrosive primer and two coats of top coat.

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