Internal Liquid Epoxy Lined and External 3LPE Coated Line Pipe
- Applied Steel Service Pipe: API 5L/ISO 3183 Gr.B-X100, ASTM A53/A106 Gr.B, ASTM A333 Gr.1/3/6, ASTM A671/A672/A691
Internal Liquid Epoxy Lined and External 3LPE Coated Line Pipe
The Internal Liquid Epoxy Lined and External 3LPE Coated Line Pipe offers exceptional protection and durability for pipelines transporting oil, gas, water, and other fluids. This advanced coating system combines the benefits of an internal liquid epoxy lining with an external three-layer polyethylene (3LPE) coating. The internal epoxy lining provides a smooth barrier against corrosion and deposits, enhancing flow efficiency and reducing maintenance. Externally, the 3LPE coating, which includes a fusion-bonded epoxy primer, adhesive copolymer layer, and polyethylene outer layer, offers robust protection against mechanical damage, environmental stressors, and corrosion. Ideal for harsh environments, this pipe ensures long-term reliability and performance in various industrial applications.
Specifications for External 3LPE Coating
| Standard | DIN30670 |
| Applied Steel Service Pipe | API 5L/ISO 3183 Gr.B-X100, ASTM A53/A106 Gr.B, ASTM A333 Gr.1/3/6, ASTM A671/A672/A691 |
| Processing ability | OD:38mm-1620mm; WT:2mm-30mm |
| Length | 6-18m |
| Surface Preparation | ISO 8501-1/SIS 055900/DIN 55928 Sa 2.5/NACE No.2/SPCC SP10 (Near White Metal Finish) |
| Coating Structure | First Layer: Epoxy Primer Layer; Second Layer: Adhesive Layer; Third Layer: High-density Polyethylene Layer |
| Packing | 1. Both ends of the pipe are beveled to 30°+5°/-0° according to ASME B16.25. 2. For large-diameter pipes (OD≥NPS 8″), each pipe is equipped with 3 anti-collision ropes (3 locations) and 2 slings, with plastic covers at the ends of the pipes, or reusable metal bevel protectors (with sealing cloth), loosely packed. 3. For small-diameter pipes (OD≤NPS 6″), each pipe is equipped with 3 anti-collision ropes (3 locations), plastic covers at the ends of the pipes, and 2 slings per bundle (the whole bundle can be wrapped in a woven bag according to the coating type or customer requirements) and tied with plastic strips (woven bags are placed underneath to protect the coating from scratches) |
| Technique | Coated on Seamless/ERW/HFW/LSAW/SSAW/JCOE/UOE/RBE Line Pipes |
| Service condition | Designed Working Temperature: -40℃ to +85℃; Alkaline or sour |
| Place of Origin | Made in China |
| MOQ | Depends on order quantity |
| Transportation | Railway, By Sea |
| Type of DIN30670 3LPE/3PE coating | ||
| Type | N | S |
| Design temperatures for sintered polyethylene coatings | from −20 °C up to +50 °C | from −40 °C up to +70 °C |
| Design temperatures for extruded polyethylene coatings | from −20 °C up to +60 °C | from −40 °C up to +80 °C |
| 3LPE Coating thickness | ||
| Nominal size DN | normal (n) | increased (v) |
| DN≤ 100 | 1,8 | 2,5 |
| 100< DN≤ 250 | 2,0 | 2,7 |
| 250 < DN< 500 | 2,2 | 2,9 |
| 500 ≤ DN <800 | 2,5 | 3,2 |
| DN ≥800 | 3,0 | 3,7 |
| DIN30670 3LPE/3PE Coating Performance | |||
| Property | Requirement | Testing as in | Notes |
| Degree of cure of epoxy resin | ΔTg according to the manufacturer’s specification | Annex B | |
| Cathodic disbondment (CD test) | 23 °C/28 d or 60 °C/2 d max. 7 mm | Annex C | Applies only to three-layer coatings |
| Peel strength | Type N: 100 N/cm (23 °C) 20 N/cm (50 °C) Type S: 150 N/cm (23 °C) 30 N/cm (70 °C) |
Annex D | For system testing single values shall be no more than 25 % lower than the required average value. |
| Continuity (holiday detection) | No discharges | Annex E | 25 kV test |
| Elongation at break (23 °C ± 2 °C) | min. 400 % | Annex F | |
| Impact resistance (23 °C ± 2 °C) | Type N: ≥ 5 J/mm Type S: ≥ 7 J/mm |
Annex H | 25 kV test No discharges |
| Low-temperature impact resistance | Type N: ≥ 5 J/mm (−20 °C ± 2 °C) Type S: ≥ 7 J/mm (−40 °C ± 2 °C) |
Annex H | 25 kV test No discharges |
| Indentation resistance | Type N: max. 0,2 mm (23 °C) max. 0,3 mm (50 °C) Type S: max. 0,2 mm (23 °C) max. 0,4 mm (70 °C) |
Annex I | |
| Specific electrical coating resistance (23 °C ± 2 °C) | ≥ 108Ωm² | Annex J | |
| UV resistance | ΔMFR ± 35 % | Annex K | |
| Thermal aging resistance | ΔMFR ± 35 % | Annex L | |
Specifications for Internal Liquid Epoxy Coating
| Standard | EN 10301: Internal Liquid Epoxy Coating for Steel Tubes and Fittings API RP 5L2: Internal coating of line pipe for non-corrosive gas transmission service AWWA C210: Liquid-epoxy coating systems for the interior and exterior of steel water pipelines. ISO 15741: Paints and varnishes — Friction-reduction coatings for the interior of on- and offshore steel pipelines for non-corrosive gases |
| Applied Steel Service Pipe | API 5L/ISO 3183 Gr.B-X100, ASTM A53/A106 Gr.B, ASTM A333 Gr.1/3/6, ASTM A671/A672/A691 |
| Processing ability | OD: 38mm-1620mm; WT: 2mm-30mm Length: 6 – 18m |
| Internal Coating Material | 3M, AkzoNobel, Hempel, Jotun Wear-resistant, flow-efficient, seawater-resistant inner coatings |
| Packing | Plain/Beveled Ends with Plastic caps, Bundled or Loosely Packed |
| Technique | Lining the internal surface of Seamless/ERW/HFW/LSAW/SSAW/JCOE/UOE/RBE Line Pipes |
| Application | Sa 2.5 (Near White Metal Finish) as per ISO 8501-1/NACE No.2/SPCC SP10 |
| Service condition | Non-corrosive gas, Drinking water |
| Place of origin | Made in China |
| MOQ | Depends on order quantity |
| Transportation | Railway, By Sea |
| Layer Type | Dry film thickness(µm) |
| Type n (normal) | ≥ 200 |
| Type v (increasing) | ≥ 250 |
| Type s (special) | ≥ 300 |
| Note: The thickness of the anti-corrosion layer at the welded places shall not be less than 80% of the specified thickness of the anti-corrosion layer of the pipe body. | |
Internal Applied Epoxy Coatings
| Effects | Manufacturer | Product Name | Features |
| Abrasion Resistance | 3M | 3M™ Scotchkote™ Fusion-Bonded Epoxy Coating 6233 | High abrasion resistance, excellent adhesion, and durability. |
| AkzoNobel | Interbond 2340UPC | High-build epoxy with superior abrasion resistance. | |
| Hempel | Hempaline Defend 630 | Solvent-free epoxy lining with excellent abrasion resistance. | |
| Jotun | Jotaguard 630 | High-performance epoxy with strong abrasion resistance. | |
| Flow Efficiency Improvement | 3M | 3M™ Scotchkote™ Epoxy Coating 162HB | Smooth surface finish to reduce friction, improving flow efficiency. |
| 3M | 3M™ Scotchkote™ Internal Pipe Coatings EP2306HF | Contains 48% solids, developed for maximum flow efficiency in oil and gas pipelines. | |
| 3M | 3M™ Scotchkote™ Internal Pipe Coatings EP2306HF(75) | Contains 75% solids, for maximum flow efficiency in oil and gas pipelines. | |
| 3M | 3M™ Scotchkote™ Internal Pipe Coatings EP2306SF | Contains 100% solids, designed for maximum flow efficiency in oil and gas pipelines. | |
| AkzoNobel | Intertherm 3070 | Smooth, low-friction finish to enhance flow efficiency. | |
| Hempel | Hempadur 35560 | Smooth finish to reduce friction and improve flow efficiency. | |
| Jotun | Jotun FlowGuard | Designed to enhance flow efficiency with a smooth, low-friction surface. | |
| Corrosive Seawater Resistance | 3M | 3M™ Scotchkote™ Epoxy Coating 328 | Excellent resistance to seawater, providing long-term corrosion protection. |
| AkzoNobel | Interzone 954 | Outstanding resistance to seawater, ideal for subsea pipelines. | |
| Hempel | Hempadur 85671 | High resistance to seawater and long-term protection against corrosion. | |
| Jotun | Jotun Tankguard HB Classic | Excellent seawater resistance, suitable for protecting against corrosive marine environments. |
| The main performances of internal coating | ||
| Items | Performance index | Test method |
| Pinhole test | Pinhole dispersion shall be held to a minimum | EN 10301/API RP5L9/AWWA C210 |
| Dry film thickness | ≥80μm | |
| Cure test | No softening, wrinkling, or blistering | |
| Adhesion test | No loss of adhesion | |
| Bend test | No loss of adhesion, spalling, or crack | |
| Soaking test | No loss of adhesion, softening, wrinkling or blistering | |
| Stripping test | Flake off, present powder particles when rolled | |
Applications of Dual-Protected Line Pipes
Oil and Gas Industry
Transmission Pipelines: Used for transporting oil, gas, and refined products over long distances, both onshore and offshore.
Flowlines and Gathering Lines: Suitable for collecting oil and gas from wells and transporting them to processing facilities.
Subsea Pipelines: Provides enhanced protection in harsh marine environments, ensuring long-term durability.
Water and Wastewater Industry
Potable Water Pipelines: Ensures safe and clean transportation of drinking water, protecting against internal and external corrosion.
Sewage and Wastewater Pipelines: Ideal for transporting sewage and wastewater, offering resistance to aggressive waste materials.
Chemical and Petrochemical Industry
Process Piping: Suitable for transporting chemicals in chemical plants, providing resistance to internal chemical corrosion and external environmental factors.
Petrochemical Facilities: Used in pipelines exposed to aggressive chemicals and high temperatures.
Marine and Offshore Applications
Offshore Platforms: Suitable for risers and flowlines in offshore oil and gas platforms, providing comprehensive protection against seawater and mechanical stresses.
Subsea Pipelines: Offers robust protection for pipelines installed on the seabed, ensuring long-term reliability.
Infrastructure and Construction
Water Distribution Systems: Used in urban water distribution networks, providing long-term corrosion protection.
Fire Protection Systems: Ideal for fire mains and other fire protection applications, ensuring reliable water flow under high pressure.
Power Generation
Cooling Water Systems: Suitable for power plant cooling systems, protecting against internal corrosion from cooling water and external environmental factors.
Mining and Slurry Applications
Slurry Pipelines: Used in mining operations to transport abrasive slurries, offering protection against internal abrasion and external corrosion.
