DN80 Pre-Insulated Corrosion Protected 3PP Steel Pipe for Oil & Gas

The DN80 Pre-Insulated 3PP Steel Pipe is a high-performance, factory-integrated pipeline solution specifically engineered to address the critical challenges of corrosion protection and thermal management in upstream, midstream, and downstream oil & gas operations. Combining a robust Three-Layer Polypropylene (3PP) anti-corrosion coating with efficient polyurethane (PUR) foam insulation and a protective HDPE outer casing, this pipe delivers unparalleled long-term asset integrity and operational efficiency for flowlines, gathering lines, and auxiliary piping systems in onshore and offshore environments.

Core Parameters (Strictly Aligned with Global Engineering Procurement Search Habits)

● Size & Pressure Rating: Nominal Diameter DN80 (NPS 3, OD 88.9mm). Available in standard wall thicknesses (e.g., Sch 40, Sch 80, Sch 160) and high-grade materials (API 5L Gr B to X65) to meet specific design pressures (MAWP) and sour service requirements (HIC/SSC tested upon request).

● Multi-Layer Construction: Inner Steel Pipe: Seamless or ERW (Electric Resistance Welded) pipe compliant with API 5L/ISO 3183.

✓ Corrosion Barrier: 3PP Coating System—FBE primer, copolymer adhesive, and a thick, impact-resistant Polypropylene (PP) top layer. Standard coating thickness ≥ 1.8mm, providing superior resistance to mechanical damage, soil stress, and chemical attack.

✓ Insulation Layer: Closed-cell Polyurethane (PUR) Foam, density ≥ 60 kg/m³, with thermal conductivity λ ≤ 0.033 W/(m·K) at 50°C, ensuring maintained fluid temperature and preventing wax or hydrate formation.

✓ Outer Protection: High-Density Polyethylene (HDPE) Jacket, typically yellow or black, providing mechanical protection, UV resistance (for above-ground sections), and a waterproof barrier.

1. Maximizing Asset Life & Minimizing OPEX (Total Cost of Ownership)

● Corrosion Defense: The 3PP coating's exceptional chemical inertness and high-temperature stability (up to 120°C) make it ideal for transporting produced water, wet CO2, and hydrocarbons. It dramatically extends service life compared to FBE or 3PE coatings in aggressive environments, reducing the frequency and cost of pipeline replacements and unscheduled shutdowns.

● Thermal Efficiency & Flow Assurance: Effective insulation is critical for flow assurance. Our PUR foam maintains optimal fluid viscosity, prevents heat loss in oil/gas streams, and mitigates the risk of paraffin deposition and hydrate blockages, ensuring consistent flow and reducing the need for chemical inhibitors or costly remediation.

2.Installation Efficiency & Project Risk Reduction

● "Ready-to-Install" System: The factory-applied, pre-tested pre-insulated system eliminates costly, time-consuming, and quality-variable field joint coating and insulation. This significantly accelerates project timelines, reduces labor costs, and ensures uniform, guaranteed quality over the entire pipeline length.

● Mechanical Durability: The integrated HDPE casing and tough PP coating withstand backfill stresses, construction handling, and long-term soil movement, minimizing installation damage and future ground settlement risks.

3. Customization for Complex Projects

Project-Tailored Solutions: We customize based on your P&ID and specifications:

● Pipe: Special grades/wall thicknesses for high-pressure or corrosive media.

● Coating: Adjust PP thickness for rocky terrain or increased abrasion resistance.

● Insulation: Vary foam density and thickness for specific temperature maintenance requirements.

● Pre-Fabrication: Supply pipes with pre-welded flanges (ANSI/ASME/DIN), beveled ends, or pre-insulated elbows/tees to minimize field welding.

1. Dimensional Customization:

● Diameter & Wall Thickness: While 4020mm is our standard large diameter, we can adjust both OD and wall thickness according to your design specifications and pressure ratings.

● Pipe Length: Custom cut lengths from 6 to 18 meters, with precise beveling ends ready for field welding.

● Pipe Ends Configuration: Options include plain ends, beveled ends (30-37.5°), special tolerances, or flanged ends to match your connection requirements.

2. Material Specification:

● Steel Grade Selection: Available in various API 5L grades (B, X42, X46, X52, X56, X60, X65, X70) to match your pressure and mechanical requirements.

● Plate Specifications: Custom chemical composition and mechanical properties to meet specific environmental challenges (low temperature, sour service, etc.).

3. Coating System Customization:

● FBE Coating Thickness: Adjustable DFT (Dry Film Thickness) from 300μm to 1000μm based on corrosion protection requirements.

● Coating Type Variations: Single-layer FBE, dual-layer FBE, or composite systems (FBE primer with polyolefin topcoat) for enhanced mechanical protection.

● Special Formulations: High-temperature FBE (up to 150°C), UV-resistant FBE for exposed sections, or drinking water certified FBE formulations.