What materials are used for the internal and external anti-corrosion protection of buried pipelines?
Thread Content
The medium flowing within the pipeline is ethylene glycol, and the salinity of the surrounding soil is very high. What materials should be used for the internal and external anti-corrosion protection of buried pipelines? Is there any standard that specifies this?
This post was last edited by ylb913 on 2015-11-29 at 11:36. We used asphalt in the past, and these past few years we’ve been using something like resin – it’s hard to describe exactly. Refer to: SH/T 3022-2011 Code for Corrosion Prevention Design of Coatings on Petrochemical Equipment and Piping; SH/T 3606-2011 Technical Specifications for the Construction of Corrosion Prevention Coating Projects in the Petrochemical Industry
Try epoxy resin or phenolic resin
Epoxy resin or epoxy ceramic can be used for internal anti-corrosion, while asphalt is more commonly used for external anti-corrosion
Okay, thank you very much. I’ll check it
It is best to use hot-dip galvanized pipes, as they are more resistant to salt. The pipes should be covered with asphalt as a base layer, along with a 3PE anti-corrosion coating. After completion, an electric spark inspection must be carried out; only if it passes can the pipes be backfilled. For backfilling, fine sand or fine soil should be used first, so as not to damage the anti-corrosion layer