3LPE or 3LPP external coating steel pipe for oil and gas pipeline 3LPE and 3LPP coating steel pipe Specification ?Coating materialsCoating materialsCharacteristicsPE/PP compound layerHigh density PE (Containing 2~3% furance black and small amount of antioxidant) Stabilized PPPE/PP adhesive layerSame as abovePrimer layerLiquid epoxy or fusion bond epoxy powerThe Three Layer Polyethylene (3LPE) system is applied to pipelines operating at temperatures ranging from -40 to +80oC. The Three Layer Polypropylene (3LPP) system is applied to pipelines operating at temperatures ranging from -20 to +110oC. Typically the two systems have a thickness ranging from 1.5 to 3mm. The 3LPE and 3LPP external coating plant is equipped to coat pipes with a nominal diameter?ranging from 2"?to 48", and lengths ranging from 8m to 18m. The standard layer thickness is minimum 2.5mm or 3/5mm but this value can be changed upon customers’?request. Production Process The pipes are first cleaned and heated. Then the powder epoxy is applied, forming the first layer of the system. This is followed by the application of a copolymeric adhesive via lateral extrusion to provide the adherence necessary between the primer and the third system layer. Finally, a polyolefin (Polyethylene or Polypropylene) is applied, also via lateral extrusion, completing the?three layer system. This system is suitable for underground gas and oil pipelines and underwater installations. Production equipment of 3LPE and 3LPP coating steel pipeColor codeThe standard color of PE is black, and PP is white.Mark on 3LPE or 3LPP coating steel pipeUsually, mark includes standard, steel grade, size, weight, mill name, heat number. Of course, mark can also be made on the steel pipes body according to customers’?instructions. Application3LPE and 3LPP coating steel pipe by this method combines excellent mechanical properties and stable chemical and electrical characteristics, making it suitable for: --- General underground service ---Highly corrosive soil service ---Underwater service ---High and low temperature service
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