Liquid Epoxy (LE) Coated Line Pipe

Liquid Epoxy (LE) coated line pipes are designed to provide long-lasting corrosion protection for steel pipelines used in various industries, including water supply, gas transmission, and oil distribution. These coatings are applied in a single layer using a two-part liquid epoxy system, ensuring durability and performance under different environmental conditions.

The coating process begins with thorough cleaning and sandblasting of the pipe surface to remove any contaminants and ensure proper adhesion. Once the surface is prepared, liquid epoxy is applied using a spray gun, forming a uniform layer that cures after application. This method not only enhances the pipe's resistance to corrosion but also improves its overall structural integrity.

LE Liquid Epoxy Coating and Lining follows several international standards, including AWWA C210, SHELL DEP 31.40.30.35, EN 10301, ISO 15741, and API RP 5L2. These standards define the materials, application methods, and performance requirements for both internal and external coatings, ensuring consistency and quality across different projects.

AWWA C210 outlines the specifications for internal and external liquid epoxy coating systems used on steel water pipes, while SHELL DEP 31.40.30.35 focuses on non-corrosive gas transmission lines. EN 10301:2006 covers internal coatings for onshore and offshore pipelines to reduce friction during the transport of non-corrosive gases. ISO 15741:2016 sets guidelines for antifriction coatings used in similar applications, and API RP 5L2 provides recommendations for interior coatings of non-corrosive gas transfer pipelines.

External liquid epoxy coatings are applied via a spray system to protect the outer surface of the pipe from environmental corrosion. In addition to liquid epoxy, other options such as polyurethane (PU) or UV-curing varnish may be used depending on the specific project requirements.

Internal liquid lining serves multiple purposes, including preventing corrosion and improving flow efficiency. It is typically applied using a spray system, with a standard thickness ranging from 60 to 100 microns for gas pipelines. For water pipelines, the thickness can be increased to between 400 and 500 microns, using advanced solvent-free epoxy resins that offer enhanced performance and environmental benefits.

Preheating is often an optional step in internal coating processes, helping to improve the adhesion and curing of the epoxy. The result is a smooth, even coating that reduces friction, increases gas delivery capacity, and minimizes the need for frequent maintenance or compressor stations.

Overall, LE coated line pipes offer a reliable, cost-effective solution for long-term pipeline protection, making them a preferred choice in modern infrastructure and energy projects. Whether for water, gas, or oil, these coatings ensure safety, efficiency, and sustainability in pipeline systems around the world.

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