EN 3082:2001

Overview

EN 3082:2001 is a European standard developed by CEN that specifies the requirements for aerospace pipe couplings with an 8°30' angle in titanium alloy, specifically unions with bulkhead welded ends. This standard is primarily designed for repair applications in aerospace fluid systems, serving as a replacement for the earlier EN 3247 standard. The couplings covered by EN 3082:2001 are engineered to withstand nominal pressures up to 28,000 kPa and operate efficiently within a temperature range of -55 °C to 135 °C.

The use of titanium alloy ensures high strength-to-weight ratio, corrosion resistance, and reliability - critical factors for aerospace components operating under extreme environmental conditions. This standard is crucial for manufacturers, engineers, and maintenance professionals involved in the repair and maintenance of aerospace piping systems.

Key Topics

• Standard Scope
  Defines the characteristics of bulkhead union pipe couplings with welded ends made from titanium alloy for aerospace repair use.

• Nominal Pressure and Temperature
  Rated for pressures up to 28,000 kPa and temperatures from -55 °C to 135 °C, ensuring performance under stringent aerospace operational environments.

• Material and Surface Treatment
  Couplings must comply with titanium alloy material specifications as per EN 3311 or EN 3314. Surface treatment involves abrasive blasting followed by molybdenum disulphide dry lubricant coating, improving thread and sealing durability.

• Dimensions and Configuration
  Detailed dimensional data and geometric configurations are specified (see figures and tables in the standard) ensuring compatibility and interchangeability with aerospace system components.

• Marking and Identification
  Components should be marked according to EN 2424 to assure traceability and standard compliance throughout the product’s lifecycle.

• Installation and Technical Specifications
  Installation details, including grip length and washer specifications, are provided to guide proper assembly in bulkhead applications.

Applications

EN 3082:2001 couplings are widely applied in aerospace fluid systems where high pressure and temperature demands exist, such as:

• Repair and Maintenance
  Specifically designed as repair couplings to replace previous standards, allowing streamlined maintenance on titanium piping systems without full replacement.

• Hydraulic and Fuel Systems
  Ideal for aerospace hydraulic lines and fuel delivery systems that require corrosion-resistant, high-pressure connections with proven reliability.

• Structural and Environmental Systems
  Suitable for varied aerospace applications including environmental control systems and structural fluid transport where safety and performance are paramount.

Using these couplings ensures superior joint integrity and resistance to vibration and thermal cycling common in aircraft operation.

Related Standards

EN 3082:2001 works in conjunction with several other aerospace and material standards to ensure comprehensive system compatibility and safety:

• EN 3247 – The original standard for titanium alloy pipe couplings which EN 3082 replaces for repair applications.
• EN 2656 – Specifies the geometric configuration of welded ends for pipe couplings.
• EN 3275 – Covers dynamic beam seals for pipe couplings, ensuring sealing performance under pressure fluctuations.
• EN 3311 / EN 3314 – Define titanium alloy grades applicable to aerospace bar stock used in manufacturing these couplings.
• EN 2491 – Details molybdenum disulphide dry lubricant coating processes applied to sealing and thread surfaces.
• ISO 5855-3 – Governs limit dimensions for MJ threads used in these fittings.

Together, these interrelated standards create a comprehensive framework to guarantee quality, interchangeability, and safety of aerospace pipe coupling components.

Keywords: aerospace pipe coupling, titanium alloy pipe union, bulkhead welded end, repair coupling, EN 3082 standard, aerospace hydraulic fittings, high-pressure aerospace coupling, titanium alloy pipe repair, aerospace fluid systems, pipe coupling dimensions, EN 3247 replacement.