External Coatings and Internal Linings for Line Pipe
Protective systems applied to prevent external corrosion (soil, water, atmosphere) and internal corrosion (process fluids, deposits). We coordinate coating application at certified facilities.
External Coatings:
- Coating Type Abbreviation Typical Thickness Max Service Temp Common Application
- 3-Layer Polyethylene 3LPE 2.0 – 3.5mm 60°C – 80°C Buried onshore pipelines
- 3-Layer Polypropylene 3LPP 2.0 – 3.5mm Up to 110°C (140°C short-term) High-temperature, offshore, deepwater
- Fusion Bonded Epoxy FBE 300 – 500 microns 80°C – 100°C Buried and above-ground pipelines
- Dual-Layer FBE D-FBE 500 – 1000 microns Up to 100°C Enhanced damage resistance
- Coal Tar Enamel CTE 3.0 – 5.0mm 60°C Legacy pipeline systems, water lines
- Concrete Weight Coating CWC 25 – 150mm (varies) N/A Subsea stability, river crossings
- Polyurethane PU 1.0 – 2.0mm Up to 100°C Offshore risers, field joints
Internal Coatings / Linings:
- Coating Type Typical Thickness Application
- Liquid Epoxy 50 – 150 microns Internal corrosion protection, flow improvement
- FBE (Internal) 150 – 300 microns Standard internal lining for gas and water
- Glass Flake Epoxy 400 – 600 microns Enhanced barrier for corrosive fluids
- Cement Mortar Lining 6 – 15mm Water injection and cooling water lines
- HDPE Liner 3 – 12mm Abrasive and highly corrosive service
- PTFE / Teflon 0.05 – 0.5mm Extreme chemical resistance, small bore
- Quality Control & Inspection
All coating and lining systems undergo rigorous inspection to verify conformance to specification.
Test Purpose Standard
Visual Inspection Surface defects, blisters, uniformity Client spec / ISO 21809
Holiday Detection Pin-hole and discontinuity detection NACE SP0490 (external FBE), NACE TM0186/TM0384 (internal)
Peel / Adhesion Test Coating adhesion strength ISO 21809-1, DIN 30670/30678
Cathodic Disbondment (CD) Resistance to CP-induced disbondment ASTM G8/G42, ISO 21809-1
Impact Resistance Mechanical damage tolerance ASTM G14, ISO 21809-1
Bend Test Coating flexibility during field bending CSA Z245.20
Hot Water Soak / DSC Cure verification (ΔTg) for FBE CSA Z245.20
DFT Measurement Verify coating thickness specification SSPC-PA2, ISO 2808
- Coating Selection Guide
Service Condition Recommended External Coating Recommended Internal Coating/Lining
Buried onshore gas pipeline 3LPE FBE or Liquid Epoxy
Buried onshore oil pipeline 3LPE Liquid Epoxy
High-temperature oil (80-110°C) 3LPP Liquid Epoxy (high-temp grade)
Directional drilling / trenchless D-FBE or Abrasion-Resistant 3LPE FBE or Liquid Epoxy
Subsea export line 3LPP or 3LPE + CWC FBE
Offshore riser (high-temp) 3LPP (insulation grade) FBE
Sour gas gathering 3LPE (HIC-tested pipe) Liquid Epoxy (H2S/CO2 resistant)
Produced water (high chlorides) 3LPE or FBE HDPE liner or GRE lining
Water injection 3LPE or CTE Cement Mortar Lining
Oil sands slurry 3LPE + Abrasion overcoat Rubber lining
Acid injection (high concentration) FBE (chemical-resistant) PTFE lining
HPHT sour production 3LPP (high-temp) Alloy 625 weld overlay
Firewater main 3LPE or FBE Cement Mortar Lining or GRE
Cooling water CTE or 3LPE Cement Mortar Lining or Epoxy
- How We Support Your Coating & Lining Requirements
· Mill Coordination: We work directly with certified coating applicators at the pipe mill or at approved off-site coating yards.
· Specification Alignment: We ensure your coating specification (Shell DEP, NORSOK, ISO, NACE, DIN) is fully met by the applicator’s quality plan.
· Inspection Arrangement: We can arrange Third-Party Inspection (TPI) for coating application witness and final holiday detection testing.
· Field Joint Supply: We provide heat-shrinkable sleeve kits, liquid epoxy kits, and all field joint consumables with full traceability and shelf-life management.