SIST EN 2622:2002

Overview

SIST EN 2622:2002 is a European standard developed by the European Committee for Standardization (CEN), specifically tailored for the aerospace industry. It defines the dimensions and tolerances for circular tubes made of heat-resisting alloys, designed to transport fluids in aerospace applications. The specified tube diameters range from 3.2 mm to 100 mm, ensuring precise and reliable components for critical aerospace fluid systems.

This standard is essential for manufacturers, designers, and quality control professionals involved in aerospace fluid system components, guaranteeing compatibility, interchangeability, and high performance according to stringent aerospace requirements.

Key Topics

• Scope and Material
  Specifies circular tubes made from heat-resisting alloys suitable for fluids used in aerospace systems, with diameters between 3.2 mm and 100 mm.

• Dimensional Specifications
  Detailed nominal diameters, thicknesses, and corresponding linear mass values are outlined to ensure material consistency and performance-vital for weight-sensitive aerospace designs.

• Tolerances

  • Dimensional Tolerances: Defined for diameter, thickness, and length to maintain precise component fitting and assembly.
  • Geometric Tolerances: Includes straightness, roundness, and eccentricity requirements measured according to EN 3848, ensuring tubes meet aerodynamic and structural criteria.
  • Straightness deviation allows for up to 2 mm per meter depending on diameter ranges.

• Length Options
  The tubes can be supplied in either fixed or random lengths, with minimum and maximum lengths specified upon order, providing flexibility for various manufacturing and assembly processes.

• Measurement Methods
  EN 3848 is referenced for measurement methodologies on form deviations, giving a standardized approach to quality assurance.

Applications

SIST EN 2622:2002 tubes are critical in aerospace systems where fluids need to be safely and reliably transported under high-temperature and high-pressure conditions. Applications include:

• Hydraulic Systems in Aircraft
  Using heat-resistant alloy tubes ensures durability and resistance to thermal stress, maintaining fluid integrity in critical control systems.

• Fuel and Coolant Lines
  Tubes conforming to EN 2622 withstand harsh environments encountered in aerospace propulsion and cooling systems.

• Environmental Control Systems
  Ensuring efficient fluid flow in heating, ventilation, and air conditioning components within aerospace cabins.

• Structural Integration
  The precise tolerances enable seamless integration into aircraft frames and assemblies where space constraints and mechanical integrity are stringent.

The standard supports aerospace manufacturers in achieving consistent production quality and regulatory compliance, minimizing risks related to component failure.

Related Standards

• EN 3848 – Method for measuring form deviations such as straightness, roundness, and eccentricity essential for geometric tolerance assessment.
• EN 4258 – Provides the general organization and framework of aerospace metallic material standards, linking EN 2622 to broader aerospace material requirements.
• AECMA Aerospace Material Specifications (AMS) – May offer complementary requirements on material and mechanical properties for tubes used in aerospace fluids.

SIST EN 2622:2002 plays a critical role in the standardization of aerospace fluid system components, ensuring manufacturers optimize performance, safety, and interoperability. By adhering to this standard, aerospace engineers and suppliers benefit from enhanced quality control, reproducibility, and compliance within the demanding aerospace sector.