EN 4610:2005

Overview

EN 4610:2005 is a European standard developed by the European Committee for Standardization (CEN), specifying the requirements for 45° elbows with thrust wire nuts made from titanium alloy. These components are designed for aerospace pipe couplings with an 8°30' angle, ensuring high reliability and performance under demanding aerospace conditions. This standard covers elbows suitable for nominal pressures up to 28,000 kPa and operating temperatures ranging from -55 °C to 135 °C, reflecting the stringent requirements of aerospace fluid systems.

Key Topics

• Material Specification: The elbows are manufactured from titanium alloy conforming to aerospace standards EN 3311, EN 3312, EN 3314, and EN 3315, providing high strength-to-weight ratio and corrosion resistance essential for aerospace applications.

• Design and Dimensions: The elbows follow precise geometric configurations as per EN 3273 and EN 3274, including thread forms and dimensions in compliance with ISO 5855-3. Dimensions and mass are detailed specifically to ensure interchangeability and compatibility with related pipe couplings.

• Surface Treatment: Threads, sealing faces, and contact areas undergo lubrication using molybdenum disulphide dry lubricants according to EN 2491. Prior abrasive blasting with non-metallic grit ensures optimal coating adhesion with a lubricant film thickness ranging between 0.005 mm and 0.013 mm.

• Surface Roughness and Finishing: Internal surfaces are finished to a radius between 0.3 mm and 1.0 mm and a surface roughness of 0.8 µm, prohibiting hand deburring to maintain consistency and prevent damage.

• Marking and Traceability: Components are marked following EN 2424 style A, ensuring clear identification and traceability throughout the aerospace supply chain.

• Nominal Pressure and Temperature Range: Designed to withstand pressures up to 28,000 kPa and temperatures from -55 °C to 135 °C, enabling reliable performance in extreme aerospace environments.

• Thrust Wire Nut Integration: The incorporation of thrust wire nuts, per EN 3264 and EN 4032, ensures secure fastening and integrity of the pipe coupling system under dynamic stresses.

Applications

EN 4610:2005 elbows are primarily used in aerospace hydraulic and fluid systems where reliability, weight reduction, and corrosion resistance are critical. Typical applications include:

• Aircraft fuel and hydraulic lines requiring robust and leak-proof 45° pipe couplings.
• Spacecraft fluid systems exposed to harsh temperature variations and high pressures.
• High-performance aviation components where titanium alloy piping reduces weight while maintaining strength.
• Maintenance and manufacturing of aerospace systems adhering to strict regulatory standards.

By complying with EN 4610:2005, manufacturers and users ensure component compatibility, enhanced safety, and adherence to European aerospace quality frameworks.

Related Standards

To fully implement EN 4610:2005 compliant components and systems, the following related standards are essential references:

• ISO 5855-3 - Defines limit dimensions for MJ threads used in aerospace fluid system fittings.
• EN 2424 - Marks aerospace products for traceability.
• EN 2491 - Specifies molybdenum disulphide dry lubricant application and coating methods.
• EN 3264 - Details thrust wire nuts for pipe coupling.
• EN 3273 & EN 3274 - Cover dynamic beam seal ends and thread geometry for pipe couplings 8°30'.
• EN 3275 - Provides technical specifications for pipe couplings under pressures up to 28,000 kPa.
• EN 3311, EN 3312, EN 3314, EN 3315 - Define material properties and processing for aerospace-grade titanium alloys.
• EN 4032 - Focuses on thrust wire characteristics for pipe couplings.

Conclusion

EN 4610:2005 serves as a critical standard for aerospace manufacturers, specifying 45° titanium alloy elbows with thrust wire nuts used in high-pressure pipe coupling systems. This standard ensures stringent quality, precise fitting geometry, and operational reliability in aerospace fluid applications under harsh environmental conditions. Adhering to this standard facilitates component compatibility, safety, and efficiency in manufacturing and maintenance processes within the aerospace industry.