DIN 30678 Three-Layer Polypropylene (3LPP) Coated Line Pipe

Specifications

Standard	DIN 30678 Three-layer extruded polypropylene coatings of steel pipes and fittings
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 Polypropylene 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 Pipe
Service condition	Designed Working Temperature Ranges: -20℃ to +110℃; alkaline or sour services
Place of Origin	Made in China
MOQ	Depends on order quantity
Transportation	Railway, Sea

Minimum coating thickness
Nominal diameter(DN)	Minimum coating thickness(mm)
DN ≤100	1.8
125≤DN ≤250	2.0
300≤DN ≤500	2.2
600≤DN	2.5

Service life of 3pp coating
Operating temperature(℃)	Expected minimum service life(year)
23	50
60	50
80	30
90	16
100	8
Note: If the temperature at which the coatings are used alternates, their estimated service life should be inferred from the values given above.

3LPP Coating Production Process

3LPP (Three-Layer Polypropylene) coated line pipes are widely used in various applications due to their exceptional corrosion resistance, mechanical protection, and durability. Some of the key applications include:

Oil and Gas Pipelines

Onshore and Offshore Pipelines: 3LPP coated pipes are extensively used for transporting oil and gas in both onshore and offshore environments. The coating protects the pipes from harsh marine conditions, saltwater corrosion, and mechanical damage.
Subsea Pipelines: The robust mechanical protection provided by the polypropylene layer makes 3LPP coated pipes ideal for subsea pipelines subjected to high external pressures and mechanical stresses.

Water Pipelines

Potable Water Pipelines: These coatings are suitable for pipelines carrying potable water, as the coating materials are safe and provide excellent corrosion protection, ensuring the purity of the water.
Sewage and Wastewater Pipelines: 3LPP coatings are also used in pipelines for transporting sewage and wastewater, where corrosion resistance is critical.

Chemical and Petrochemical Pipelines

Transport of Chemicals: Pipelines carrying corrosive chemicals benefit from the high chemical resistance of 3LPP coatings, ensuring the integrity and longevity of the pipes.
Petrochemical Plants: In petrochemical plants, where pipelines are exposed to various aggressive chemicals and high temperatures, 3LPP coatings provide reliable protection.

Industrial Applications

Cooling Water Systems: Industrial facilities often use 3LPP coated pipes in cooling water systems, where the pipes are exposed to water, chemicals, and fluctuating temperatures.
Slurry and Mining Pipelines: In the mining industry, pipelines transporting abrasive slurries benefit from the mechanical protection and durability of 3LPP coatings.

District Heating and Cooling Systems

District Heating Pipelines: 3LPP coated pipes are used in district heating systems to transport hot water or steam. The coating provides excellent thermal insulation and protects against external corrosion.
District Cooling Pipelines: Similarly, these pipes are used in district cooling systems to transport chilled water, offering protection against external moisture and corrosion.

Renewable Energy Projects

Geothermal Pipelines: For geothermal energy projects, 3LPP coated pipes are used to transport geothermal fluids, which can be highly corrosive.
Hydropower Plants: In hydropower plants, these coatings protect pipelines exposed to continuous water flow and mechanical stresses.