Coatings and Linings
Protective coatings and linings play a crucial role in ensuring the long-term performance of large-diameter piping systems, which are often exposed to harsh environments throughout their service life. Corrosion and mechanical damage can significantly reduce the lifespan of these pipelines, making the use of high-quality protective coatings essential for maintaining structural integrity and operational efficiency.
We offer customized coating and lining solutions tailored to our customers' specific needs and in compliance with relevant industry standards. Our range of products includes:
- Polyethylene (PE) Coating
- Polypropylene (PP) Coating
- Fusion Bonded Epoxy (FBE)
All of our pipes can be subjected to high-pressure water blasting before the application of coatings or linings, ensuring optimal surface preparation for enhanced adhesion and durability.
In addition to providing passive corrosion protection, epoxy linings also help reduce internal surface roughness, which leads to lower flow resistance and improved efficiency—especially important for gas transmission pipelines.
Other coating and lining options are available upon request, depending on the specific requirements of the project.
Polyethylene (PE) Coating
The PE coating process begins with thorough drying of the pipe followed by external shot blasting to meet SA 2.5 standards. The pipe is then induction heated to approximately 220°C. An electrostatically applied epoxy (EP) powder primer is applied at a thickness of 60 to 255 µm. This is followed by an adhesive foil layer, typically 125 to 400 µm thick, and finally wrapped with a polyethylene foil. The ends of the pipe are left uncoated to allow for temporary corrosion protection if needed. To further prevent rust creep during long-term storage, a bitumen coating can be applied to the transition area between the PE chamfer and the bare pipe end.
Polypropylene (PP) Coating
At service temperatures exceeding 80°C, the indentation resistance of the coating becomes increasingly critical. In such cases, we recommend a three-layer coating system where the third layer consists of polypropylene. The construction of this PP coating system is similar to that of the PE coating system, with the exception of the outermost layer. As with the PE coating, the pipe ends are left uncoated to provide temporary corrosion protection, and a bituminous coating can be added to the transition area between the PP chamfer and the bare pipe end.
Fusion Bonded Epoxy (FBE)
The FBE coating is applied through an electrostatic process onto a pipe surface that has been shot peened to SA 2.5 standards and heated to approximately 240°C. This creates a strong, durable bond that offers excellent corrosion resistance and long-term protection.
Epoxy Lining
API RP 5L2 epoxy resin linings are commonly used for gas pipelines due to their ability to reduce internal surface roughness. By minimizing flow resistance, these linings enhance the efficiency of gas transmission and contribute to more reliable pipeline operation over time.
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