SIST EN 3852:2004

Overview

The SIST EN 3852:2004 standard, titled Aerospace series - Pipe couplings, 60°, spherical, in titanium alloy TI-P64001 - Straight unions, welded, threaded, is a European standard developed by CEN and AECMA-STAN. It specifies the characteristics and dimensional requirements for threaded welded straight unions used in pipe couplings with a 60° spherical angle, manufactured from the titanium alloy TI-P64001. This standard is primarily intended for aerospace fluid system applications, ensuring consistent quality, compatibility, and performance for critical aerospace components.

Adherence to this standard supports the design, manufacture, and assembly of aerospace piping systems that demand high strength, corrosion resistance, and precision fitting, especially relevant to aerospace fluid connectivity.

Key Topics

• Scope and Application
  Defines welded, threaded straight unions for pipe couplings with a 60° spherical configuration in titanium alloy TI-P64001. Optimized for aerospace use, this standard promotes integrity in fluid system connections.

• Configuration & Dimensions
  Detailed dimensional tables and tolerances are provided (in millimeters) to guarantee precise fits. This includes thread pitch, diameter, and geometric configuration dimensions, referenced to ISO 5855-3 for thread specifics and ISO 286-2 for tolerance grades.

• Material Specifications
  The standard mandates the use of titanium alloy TI-P64001, known for its high strength-to-weight ratio and corrosion resistance, matching the aerospace industry's strict material requirements. It references EN 2530 for the titanium alloy specifications.

• Designation and Marking
  Products standardized under EN 3852 are designated by a format including the description and dimensional code (e.g., STRAIGHT UNION EN3852-100080). Marking complies with EN 2424, style F, ensuring traceability and compliance.

• Quality Assurance
  Manufacturers must apply quality systems consistent with EN 2000, guaranteeing product reliability and production consistency.

• Assembly Guidance
  Assembly should follow recommendations in TR 4052, providing best practices for installation aligning with the EN 3852 components.

Applications

SIST EN 3852:2004 plays a critical role in aerospace fluid handling systems where pipe couplings must maintain leak-tight and durable connections under demanding operating conditions. Key applications include:

• Hydraulic and fuel systems in commercial and military aircraft
• Aerospace fluid transfer lines requiring lightweight and corrosion-resistant fittings
• High-performance aerospace engineering components where precision and material integrity are vital
• Replacement and maintenance parts conforming to unified standards across European aerospace manufacturers

Using standardized 60° spherical titanium pipe couplings ensures interchangeability and safety in aerospace fluid infrastructure, reducing risks associated with system failures and maintenance errors.

Related Standards

This standard references and integrates several key aerospace and industrial norms important for comprehensive implementation:

• ISO 5855-3 – MJ thread limit dimensions for aerospace fluid fittings
• ISO 286-2 – Standard tolerance grades and limit deviations for holes and shafts
• EN 2530 – Specifications for titanium alloy TI-P64001
• EN 2656 – Pipe coupling end geometric configuration and welding preparations
• EN 2424 – Marking of aerospace products for traceability
• EN 2000 – Quality assurance system for aerospace manufacturers
• TR 4052 – Technical report for assembly recommendations of 60° spherical titanium pipe couplings

Compliance with SIST EN 3852:2004, along with these related standards, ensures a harmonized approach to manufacturing, marking, and quality management of aerospace pipe couplings, fostering transnational compatibility and safety.

Adopting SIST EN 3852:2004 benefits aerospace engineers, manufacturers, and quality inspectors by providing clear and rigorous guidelines for the design, manufacture, and quality assurance of titanium alloy pipe coupling unions, ultimately supporting the production of safer and more reliable aerospace fluid systems.