3-layer polyethylene outer coating pipe (3LPE)
3LPE outer coating pipe is a steel pipe used for oil and gas transportation and industrial anti-corrosion engineering. It has excellent anti-corrosion performance and consists of three layers of coating: fusion bonded epoxy resin (FBE), adhesive layer (AD) and polyethylene outer layer (PE), providing strong protection and suitable for pipeline protection in harsh environments.
1. Standards and certifications
3LPE coated pipes comply with multiple international standards to ensure application performance in different environments:
Standards | Description |
API | API Standard |
ASTM | ASTM Standard |
DIN | DIN |
GB | Chinese National Standard |
JIS | Japanese Industrial Standard |
Other standards | API 5L, ANSI A210, ASTM A53, DIN 1629, JIS G3455 |
2. Grades and materials
3LPE outer coating pipes use a variety of carbon steel materials for different pressure levels and environmental requirements:
Grade | Material |
10#-45# | Q195-Q345、16Mn、ST35-ST52 |
Common brands | A106 B/C、A53 A/B、Q235、Q345、St42、St45、St52 |
3. Thickness and size
The wall thickness, outer diameter and cross-sectional shape of 3LPE steel pipes vary depending on application requirements. The following are common specifications:
Parameters | Range |
Wall thickness | 2.5mm -- 80mm |
Outer diameter (circular section) | 25mm -- 356mm |
Cross-sectional shape | Round cross-section design |
4. Three-layer coating structure
Coating | Thickness | Function |
Fusion bonded epoxy (FBE) | ≥100 microns | Provides anti-corrosion properties and |
Adhesive layer (AD) | 170-250 microns | Tightly bonds FBE to the polyethylene layer |
Polyethylene outer layer (PE) | 2.5-3.7 mm | Provides mechanical protection and weather |
5. Technical process
3LPE outer coating pipes are produced by hot rolling and hot rolling/cold drawing seamless processes to ensure pipeline strength and durability.
Whether it is underground or submarine pipelines, or industrial applications in corrosive environments, 3LPE outer coating pipes can provide long-term and reliable protection for pipeline systems.
