What are the performance advantages of steel pipes with external 3LPE and internal HEMPEL 35560 Coating?

Introduction

The hybrid coating system combining external 3-layer polyethylene (3LPE) and internal HEMPEL 35560 epoxy paint represents the state-of-the-art in pipeline corrosion protection. This dual-barrier technology addresses both external environmental threats and internal fluid corrosion, delivering exceptional performance in oil/gas, water supply, and industrial applications.

1, Integrated Corrosion Protection

The synergistic combination of external 3LPE and internal HEMPEL 35560 epoxy creates a bidirectional defense:

External 3LPE:

• 3-layer structure (FBE+adhesive+PE) provides >50kV dielectric strength.
• Withstands 28-day cathodic disbondment ≤6mm (ISO 21809-1).
• Impact resistance >10J/mm at -30°C

Internal HEMPEL 35560:

• NSF/ANSI 61 certified for potable water.
• Reduces biofilm formation by 85% vs uncoated pipes.
• Maintains adhesion after 5,000 hrs in pH 2-12 solutions.

2, Mechanical amp; Operational Benefits

• Impact resistance: 3LPE layer absorbs >8J/mm² kinetic energy during trenchless installation.
• Flow efficiency: Internal coating's surface roughness (Ra ≤7μm) lowers pressure loss by 18% in water pipelines.
• Temperature adaptability: Operates continuously at -40°C~110°C (short-term peak 130°C).

3, Operational Benefits

• Internal surface roughness Ra <10μm reduces pumping energy by 15-20%.
• Temperature range: -40°C to 110°C continuous service.
• Field-repairable with standard epoxy kits.

4, Economic Value

• Lifecycle cost: Reduces maintenance by 60% over 30 years compared to FBE-only pipes.
• Installation flexibility: Compatible with HDD, sliplining, and welding without coating damage.

5, Certification amp; Applications

• Complies with ISO 21809 (external) and NSF/ANSI 61 (internal) for oil/gas/water sectors.
• Case study: 56km seawater intake pipeline (Qatar) showed zero corrosion after 7-year service.

Conclusion

This coating system delivers superior lifecycle value, with ROI achieved within 3-5 years through reduced downtime and maintenance. It’s adaptability to extreme environments makes it the premier choice for critical infrastructure projects worldwide.

What other professional insights do you have on this kind of anti-corrosion? Welcome to discuss with us together.
Contact us for more details about Solvent Free HEMPEL 35560. 

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