Seeking help with corrosion issues
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Help: The process pipelines have not been coated for corrosion protection upon arrival at the site, but the piping connections have already been made. . It has been six months of wind and rain with no insulation or protection; I was wondering if anyone has any suggestions. Remove rust first and then paint; just sanding it a little isn’t enough – there are unevenities. Thank you for the guidance
If it isn’t installed, the only options are sandblasting to remove rust, applying paint, and insulating it.
There are standards for corrosion prevention and rust removal, with strict requirements. For ordinary pipelines, anti-corrosion treatment is often carried out after installation.
It means removing rust first and then applying paint; first apply a layer of primer, and then a layer of topcoat
All the pipes have been connected and installed. . I really don’t know what other methods there are to remove rust and prevent corrosion; it’s not easy to deal with it on the ground either
To remove rust, a zinc-rich primer is generally used, applied in two coats. Of course, the paint should be chosen based on your manufacturing process.
^_^The management is chaotic – the pipes need to be inspected before installation, and painted promptly after installation; once they start to rust, it’s too late, and one can only use scaffolding to deal with the issue, which requires more work than a regular shutdown for maintenance.
What else can be done? Rust removal and painting can only be done on the pipe tray! Or should we ask the construction company to remove it? It’s not realistic!
Depending on the actual conditions, manual or mechanical rust removal to achieve the St3 grade is sufficient; thereafter, an epoxy primer or a rust-prone primer should be used, and finally, an intermediate coat and a topcoat. High-temperature coatings should be used for pipes with high temperatures.
For corrosive media, handle those media first before carrying out rust removal and painting. There’s no perfect solution; just work on it bit by bit. In cases where the corrosion is severe and difficult to deal with, it may be necessary to insist on replacing the pipes. We need to compare the costs.
The type of paint to use depends on the environment and the manufacturing process; for hand-made items, just brushing off the rust is sufficient.