Liquid Epoxy (LE) Coated Line Pipe
LE liquid epoxy coated line pipe is a high-performance solution designed to protect steel pipes from corrosion in both internal and external environments. This type of coating is widely used in water supply, gas transmission, and other pipeline systems where durability and reliability are essential.
The coating standards for LE liquid epoxy include AWWA C210, SHELL DEP 31.40.30.35, EN 10301, ISO 15741, and API RP 5L2. These standards ensure that the coatings meet rigorous quality and performance requirements for different applications.
LE Liquid Epoxy Coating and Lining is applied as a two-part system, providing a single-layer protective coating that effectively prevents corrosion. The process begins with thorough cleaning and sandblasting of the pipe surface, followed by the application of liquid epoxy using a spray gun. Once applied, the coating cures to form a strong, uniform layer that adheres well to the steel surface.
The specifications and standards for liquid epoxy coatings cover both internal and external applications. They define the materials, application methods, and performance criteria required for effective corrosion protection in various pipeline environments.
AWWA C210 outlines the requirements for internal and external liquid epoxy coating systems on steel water pipes. SHELL DEP 31.40.30.35 focuses on non-corrosive gas transmission lines, particularly for inner coatings. EN 10301 specifies internal coatings for reducing friction in the transport of non-corrosive gases, while ISO 15741 sets out guidelines for antifriction coatings in steel pipelines.
API RP 5L2 provides recommendations for interior coatings of non-corrosive gas transfer pipelines, ensuring that the coatings are suitable for long-term use under normal construction conditions. These standards collectively support the use of liquid epoxy coatings in underground and underwater installations, offering reliable protection against environmental factors.
External liquid coatings are applied using a spray system to protect the outer surface of the pipe from corrosion. Common options include liquid epoxy, polyurethane (PU), and UV-curing varnish, each offering specific advantages depending on the application environment.
Internal liquid lining is applied to the inside of the pipe to prevent corrosion and improve flow efficiency. Available options include liquid epoxy, polyurethane, and two-component coatings. This process typically involves sealing the pipe ends and moving a spray gun through the pipe to apply the coating evenly.
For internal linings, liquid epoxy is often sprayed at a thickness of 60 to 100 microns, significantly improving gas delivery capacity and reducing frictional resistance. This leads to fewer compressor stations and lower operational costs. Additionally, internal coatings offer simplified cleaning and temporary rust protection, making them an efficient and cost-effective choice for gas transportation.
In water pipe applications, liquid epoxy is applied to the interior surface at a thickness of 400 to 500 microns. This is done using advanced solvent-free epoxy resins, ensuring a durable and environmentally friendly coating that enhances the longevity of the pipeline system.
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