EN 3867:2004

Overview

EN 3867:2004 is a European standard developed by CEN for aerospace applications, specifying the characteristics of flanges made from titanium alloy TI-P64001 used in pipe couplings, loose flanges, and seals. This standard ensures consistency, reliability, and safety in aerospace fluid systems by defining precise requirements for dimensions, materials, marking, and quality assurance of these critical components. Assembly should be performed according to TR 4053 recommendations.

Key Topics

• Material Specification
  Flanges must be manufactured from titanium alloy TI-P64001, compliant with EN 3310 (not heat-treated forging stock) or EN 3311 (annealed bar for machining). This alloy is chosen for its high strength-to-weight ratio and corrosion resistance, essential in aerospace fluid systems.

• Dimensional Tolerances and Configuration
  The standard provides detailed dimensions and tolerances expressed in millimeters, including flange diameter, bore, hole spacing, and surface finish requirements. Typical tolerances follow ISO 286-2 for limits and fits, ensuring compatibility with pipe couplings.

• Marking Requirements
  Markings on flanges must comply with EN 2424 category A to guarantee traceability and identification, including the standard number and specific flange codes.

• Quality Assurance
  Quality management systems must conform to EN 9100 standards, ensuring high reliability through rigorous design, production, installation, and servicing procedures.

Applications

EN 3867:2004 flanges are specifically designed for aerospace industry fluid systems where weight, strength, and corrosion resistance are critical:

• Aerospace Fluid Systems: Use in air, fuel, hydraulic, and cooling piping systems across aircraft and spacecraft.
• Pipe Couplings and Loose Flanges: Used in modular piping systems requiring maintenance or assembly flexibility.
• High-Performance Aerospace Manufacturing: Suitable for components subjected to demanding mechanical stresses and environmental exposure.

By standardizing the flanges for titanium alloy TI-P64001, EN 3867:2004 supports effective supply chain management and interoperability in aerospace manufacturing.

Related Standards

• EN 3310 & EN 3311: Define the titanium alloy TI-P64001 material in forging and bar formats.
• TR 4053: Provides assembly recommendations for pipe couplings, loose flanges, and seals using titanium alloy materials.
• ISO 286-2: System of limits and fits, covering tolerance grades applicable to flange dimensions.
• EN 2424: Specifies marking procedures for aerospace products, ensuring product traceability.
• EN 9100: Quality management systems standard tailored for aerospace design and manufacturing processes.

Practical Value

Implementing EN 3867:2004 helps aerospace manufacturers:

• Maintain consistent flange designs to meet stringent aerospace safety standards.
• Ensure material reliability using certified titanium alloy TI-P64001 components.
• Facilitate interoperability and reduce assembly errors via standardized dimensions and markings.
• Enhance quality control aligned with internationally recognized aerospace quality management systems.
• Improve maintenance and servicing through traceable marking and assembly guidelines.

This standard is vital for aerospace engineers, manufacturers, and quality assurance teams focused on high-integrity piping systems using advanced titanium alloys.