Pipe coating is most successful and consistent for protecting HSAW pipes from corrosion, moisture and other harmful chemicals. Coated pipes are the most viable cost effective products used for transmission of oil, gas, water and other fluids. The coating provides pipelines with a constant protective layer that shield the pipes from damaging effects of corrosion.
3LPE (external 3 layer polyethylene)
3LPP ( External 3 layer polypropylene)
FBE ( External fusion bonded epoxy )
Internal epoxy coating
Coated pipes offer high resistance to corrosion on pipes and provide many benefits such as:
3LPE Coated Pipes consist of 3 layers for pipeline coating.
Layer 1 consists of Fusion Bonded Epoxy. This later provides protection against corrosion and is fusion bonded with the blasted steel surface.
Layer 2 is a copolymer adhesive which has excellent chemical bonding to the inner layer and the top layer of polyethylene.
Layer 3 is the layer of polyethylene used for protection against any physical damage of the pipes.
The 3 layer polyethylene coated pipes are the preferred choice for transmission of oil and gas around the world. It can withstand varied temperatures and environments ranging from dessert dry lands to deep underwater regions. 3LPE coated steel pipes are used for transportation of drinking water, oil ,gas and other fluids. The 3LPE coated pipes can be used in the high temperatures as high as 60○Cto 80oC.
Fusion bonded epoxy (FBE) coated pipes are used to prevent corrosion of steel pipes and harmful chemicals. These are thin coatings of epoxy-resin powder materials formed in a film and applied on pipes by specialized coating facilities by electrostatic spraying. These FBE coated pipes can be used in temperatures up to 85oC in dry conditions. FBE Coating has been used as a standard in industries for protection againstcorrosion. FBE coatings have good handling characteristics; they are flexible and resistantto soil pressure. These are used in pipeline projects that have normal requirements and do not have harsh conditions.
3 LPP coating
3LPP Coated Pipes consists of multilayer anti-corrosion coatings consisting of an inner layer of fusion bonded epoxy layer, the middle layer is an adhesive layer and an outer layer of polypropylene. The inner layer is used for protection against corrosion and chemical damage while the outer layer is used for protection against any physical damage in laying and transportation.The 3 layer polypropylene coated pipes are used in oil fields where the resources are drawn from deep reservoirs and at high temperatures (100oC to 140oC). It is highly abrasion resistant and is generally used where the chances of damage are high such as Rocky Mountains or for drilling operations.
Deep Seals (India) limited manufacture and supply internal coated pipes (epoxy coated). A spraying nozzle has been used to spray the liquid epoxy inside the pipe as per the required thickness. Before applying the epoxy paint, internal surface of the pipe is cleaned. The typical coating thickness for gas pipelines varies between 60 to 1000μm and for water and other liquids it varies between 200 to 500μm
Features of Internal coating