‌Best Practices for Anti-Corrosion Treatment in Oil & Gas Pipeline Engineering

As a leading steel pipe manufacturer with over two decades of expertise, we understand the critical role of corrosion prevention in ensuring pipeline longevity and operational safety. Below, we outline industry-proven anti-corrosion strategies tailored for oil and gas infrastructure.

‌1. Surface Preparation: The Foundation of Corrosion Resistance‌

‌Pre-cleaning‌: Remove oil, grease, and contaminants using solvents or alkaline solutions to ensure proper adhesion of coatings‌.

‌Abrasive Blasting‌: Achieve Sa2.5–Sa3 cleanliness grades via centrifugal wheel blasting or compressed-air spraying with steel grit (0.5–1.2mm粒径)‌.

‌Chemical Pickling‌: For complex geometries, employ hydrochloric acid baths (10–15% concentration) to dissolve mill scale and rust‌.

Critical Note: Post-treatment surfaces must achieve 50–75µm anchor profile depth for optimal coating bonding‌.

‌2. Coating System Selection & Application‌

‌Primary Coatings‌

‌Field Joint Protection‌

Apply UV-cured shrink sleeves with >35N/10mm peel strength‌

Implement dual-layer heat-shrinkable tapes for subsea applications

‌3. Quality Assurance Protocols‌

‌Adhesion Testing‌: Conduct cross-cut tests per ISO 2409 (Class 0–1 required)‌.

‌Holiday Detection‌: Use 15kV/mm DC spark testers for FBE coatings‌.

‌Thickness Control‌: Validate via magnetic induction gauges (±10% tolerance)‌.

Pro Tip: Maintain 15–25°C and <85% RH during coating curing to prevent blistering‌.

‌4. Material Specifications‌

Our pipes comply with:

‌API 5L/ISO 3183‌ for linepipe requirements

‌ASTM A106/A53‌ for seamless carbon steel pipes

‌GB/T 8163-1999‌ for fluid transportation

‌5. Case Study: Desert Pipeline Project‌

‌Challenge‌: High salinity (Cl⁻>5,000ppm) and 55°C diurnal temperature swings

‌Solution‌:

Base layer: 350µm FBE

Intermediate: 150µm epoxy primer

Topcoat: 2.5mm polyurethane

‌Result‌: 0% corrosion failure after 8 years (per 2024 inspection)

‌6. Maintenance & Monitoring‌

Deploy intelligent pigs with MFL sensors for in-line inspection‌

Implement cathodic protection (-0.85V to -1.2V vs Cu/CuSO4 reference)‌