Haihao Group’s advanced anti-corrosion solutions for submarine pipelines
Submarine pipeline systems, particularly in offshore oil, gas, and energy projects, are constantly exposed to some of the harshest environmental factors on earth—high salinity, constant water pressure, abrasive seabed particles, and aggressive chemical reactions. Without effective protection, these factors can drastically reduce the lifespan of pipeline infrastructure.Haihao Group, with over 40 years of expertise in pipeline solutions, offers advanced 3PE (Three-Layer Polyethylene) coated pipe fittings, specifically designed to withstand these marine challenges.
3PE Coating Elbows Produced By Haihao Group
Why 3PE Coating is Essential for Submarine Pipelines
When it comes to corrosion protection under seawater, traditional coatings like epoxy or single-layer polyethylene often fall short. The 3PE coating system used by Haihao Group offers a superior solution by combining three distinct layers for comprehensive defense:
| Coating Layer | Function |
|---|---|
| Epoxy Primer Layer | Excellent adhesion to the steel surface |
| Polyethylene Adhesive Layer | Strong bonding between layers |
| Polyethylene Topcoat Layer | High mechanical strength & waterproof barrier |
This multilayer structure forms an impermeable shield, preventing corrosion, salt intrusion, and mechanical damage caused by seabed movement or debris.
Technical Advantages of Haihao Group’s 3PE Coated Pipe Fittings
Unlike standard coatings, our 3PE solution offers measurable benefits supported by strict laboratory and field tests:
| Performance Indicator | Specification |
|---|---|
| Coating Thickness | 2.5 – 3.5 mm |
| Adhesion Strength (Pull-off Test) | ≥ 10 N/mm² |
| Salt Spray Resistance | ≥ 1000 hours (no corrosion) |
| Impact Resistance | High (meets ISO 21809-1) |
These properties ensure that Haihao Group’s pipe fittings deliver superior anti-corrosion performance in the world’s most demanding marine environments.
Strict Surface Preparation: The Foundation of Quality
For anti-corrosion coatings to perform as intended, surface preparation is critical. Before any 3PE coating is applied, Haihao Group’s technicians follow rigorous procedures:
- Blast cleaning to remove rust, scale, and contaminants
- Surface roughness controlled to Sa2.5 or better (per ISO 8501-1)
- Pre-heating to ensure proper epoxy primer bonding
This attention to detail guarantees that the coating adheres perfectly, maximizing durability and minimizing the risk of premature failure.
Quality Assurance: Tested, Verified, Guaranteed
All coated pipe fittings undergo strict quality control at every stage:
- Coating Thickness Measurement (using magnetic gauges)
- Holiday Testing (detecting pinholes or defects)
- Adhesion Tests (per ISO 21809)
- Salt Spray Testing (per ASTM B117)
- Each product is accompanied by a full EN 10204 3.1 Certificate and detailed test reports.
Frequently Asked Questions (FAQ)
Q1: Why choose 3PE coating over FBE for offshore pipelines?
A: 3PE offers multi-layer mechanical protection and longer service life compared to single-layer FBE, especially in environments with seabed movement and particle abrasion.
Q2: What is the typical service life of 3PE coated fittings?
A: Up to 30–50 years, depending on environmental conditions and maintenance.
Q3: Can Haihao provide 3PE-coated fittings for deepwater (>1000m) projects?
A: Yes. Our 3PE system has been validated for deep-sea applications, including high external pressure resistance.
Haihao Group’s 3PE-coated pipe fittings represent the industry benchmark for corrosion protection in submarine pipeline applications. From custom engineering to certified quality control, we ensure every product performs flawlessly under extreme subsea conditions.
Contact us today to discuss your submarine pipeline project and request a customized anti-corrosion solution that guarantees long-lasting performance. Email:sales@haihaogroup.com