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3LPE External Coating Steel Pipe for Oil and Gas Pipeline

3LPE or 3LPP external coating steel pipe is suitable for underground gas and oil pipelines and underwater installations.

Description

3LPE or 3LPP external coating steel pipe

For oil and gas pipeline


3LPE and 3LPP coating steel pipe Specification
 

Coating materials

Characteristics

PE/PP compound layer

High density PE
(Containing 2~3% furance black and small amount of antioxidant)
Stabilized PP

PE/PP adhesive layer

Same as above

Primer layer

Liquid epoxy or fusion bond epoxy power


The 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 pipe


       


Color code

The standard color of PE is black, and PP is white.


Mark on 3LPE or 3LPP coating steel pipe
Usually, 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.


Application
3LPE 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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