PP-Coated Steel Flange

In modern industrial pipeline systems, flanges, as key components connecting pipes to each other, their performance directly affects the safety and efficiency of the entire system. Especially in corrosive environments such as chemical engineering and water supply, traditional metal flanges are prone to corrosion, while all-plastic PP flanges have insufficient strength.

As an innovative product, PP-Coated Steel Flange has successfully solved this problem through its unique steel-plastic composite structure and has become an ideal choice for pipeline connection in corrosive environments.

Features and Advantages of PP-Coated Steel Flanges

1. Excellent Corrosion Resistance

The outer polypropylene layer of the PP-Coated Steel Flange offers excellent chemical resistance, resisting corrosion from a wide range of acids, alkalis, salts, and other chemical media. The thick-walled, seamless PP fiberglass sheath ensures that corrosive media are completely prevented from contacting the internal steel core, fundamentally eliminating the corrosion problem associated with metal flanges.

2. High Strength and Rigidity

The solid internal steel core provides the necessary mechanical strength and rigidity, enabling the flange to withstand the various stresses and pressures (up to 2.5 MPa) found in piping systems. This eliminates the problems associated with pure plastic flanges, such as deformation during tightening and thermal deformation at high temperatures, which can lead to seal failure.

3. Excellent Temperature Adaptability

The PP-Coated Steel Flange has a continuous operating temperature of up to 80°C, meeting the requirements of most industrial applications. Its unique structural design ensures that it maintains a strong seal despite temperature fluctuations.

4. Lightweight Design

Compared to traditional all-metal flanges, PP-coated steel flanges are lighter (specific gravity approximately 2-3g/cm³), significantly simplifying transportation and installation, and reducing worker workload.

5. Long Service Life

Because the plastic layer protects the internal metal core from corrosion, the product’s service life is significantly extended. According to application data, the service life of steel-lined polypropylene pipes is over 10 times longer than that of steel pipes, giving PP-coated steel flanges a longer service life.

Product specifications and technical parameters

Applications

Chemical Industry: Piping systems used to transport various chemical media, ensuring safe operation due to corrosion resistance.

Water Supply Systems: Residential water pipelines and sewer systems to prevent rust contamination.

Equipment and Plant Engineering: Connections to pumps, valves, containers, and other equipment for easy disassembly and maintenance.

General Mechanical Engineering: Applications requiring corrosion-resistant and pressure-resistant pipe connections.

Installation and Usage Precautions

Pre-installation Inspection: Before installation, inspect the flange sealing surfaces to ensure they are free of damage and impurities.

Selecting the Appropriate Gasket: Select the appropriate flange gasket (such as asbestos gasket, rubber gasket, polyethylene gasket, or spiral wound gasket) based on the medium being transported.

Bolt Tightening: When tightening bolts, tighten them in alternating diagonal patterns to ensure uniform force on the sealing surfaces.

Avoid Overtightening: Avoid overtightening bolts, which can cause deformation and damage to the plastic layer.

Temperature Considerations: When used in environments near the maximum operating temperature (80°C), check the tightening status regularly. Maintenance: Check flange connections regularly for leaks and retighten bolts or replace gaskets if necessary.

Quality Assurance and Testing

Appearance Inspection: Visually inspect the coating for a smooth, even, dense appearance, uniform color, and absence of bubbles.

Spark Test: Use a spark detector to detect pinhole defects and ensure there is no penetration.

Thickness Inspection: Use a thickness gauge to measure coating thickness to ensure compliance with design standards.

Pressure Test: Hydrostatic and airtightness tests are performed as needed to verify pressure bearing capacity and sealing performance.

The PP-Coated Steel Flange, with its innovative steel-plastic composite structure, successfully addresses the long-standing dilemma of balancing strength and corrosion resistance in pipe connections. Its excellent corrosion resistance, high mechanical strength, light weight, and long service life make it an ideal choice for the chemical, water supply, and various other industrial sectors.

As industrial development places increasing demands on piping systems, the PP-Coated Steel Flange, an innovative product that combines the advantages of metal and plastic, is poised to expand its application prospects.

Specification