EN 4563:2003

Aerospace series - Pipe coupling, welded, in heat resisting steel - Tees - Inch series

This standard specifies the characteristics of welded tees for inch series pipe couplings, in heat resisting steel, for aerospace applications.
Nominal pressure : Class D per ISO 6771

Luft- und Raumfahrt - Rohrverschraubung zum Anschweißen aus hochwarmfestem Stahl - T-Stutzen - Inch-Reihe

Diese Norm legt die Eigenschaften von T-Stutzen für Rohrverschraubungen zum Anschweißen der Inch-Reihe aus hochwarmfestem Stahl für Anwendungen in der Luft- und Raumfahrt fest.
Nenndruck: Klasse D nach ISO 6771.

Aerospace series - Pipe coupling, welded, in heat resisting steel - Tees - Inch series

General Information

• Status: Published
• Publication Date: 18-Feb-2003
• Withdrawal Date: 30-Aug-2003
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 21-Jan-2024
• Completion Date: 11-Feb-2026
• Ref Project: SIST EN 4563:2004 - Aerospace series - Pipe coupling, welded, in heat resisting steel - Tees - Inch series

Relations

• Refers: ISO 6771:1987 - Aerospace — Fluid systems and components — Pressure and temperature classifications
• Effective Date: 09-Feb-2026
• Refers: EN 4549:2014 - Aerospace series - Pipe coupling, in heat resisting steel or in heat resisting nickel alloy - Coupling end, welded - Design configuration - Inch series
• Effective Date: 28-Jan-2026
• Refers: EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026
• Refers: EN 4560:2015 - Aerospace series - Pipe coupling 37°, spherical up to 21 000 kPa - Inch series - Technical specification
• Effective Date: 28-Jan-2026
• Refers: EN 3487:2024 - Aerospace series - Steel X6CrNiTi18-10 (1.4541) - Air melted - Softened - Bars for machining - a or D ≤ 250 mm - 500 MPa ≤ Rm ≤ 700 MPa
• Effective Date: 28-Jan-2026

Overview

EN 4563:2003 is a European Standard published by CEN that establishes the requirements for aerospace pipe coupling tees-welded, fabricated from heat resisting steel, in inch series dimensions. Tees specified in this standard are essential connectors in aerospace fluid systems, allowing the branching of pipelines under conditions where both high performance and material integrity are critical. This standard aligns with aerospace requirements for reliability, safety, and compatibility, supporting nominal pressure Class D as defined by ISO 6771.

Key Topics

• Heat Resisting Steel Construction
  Tees manufactured under EN 4563 are made from specified heat resisting steels, offering enhanced durability and performance in demanding aerospace environments.

• Welded Pipe Coupling Design
  The standard focuses on welded construction, required for high-integrity, leak-resistant fluid system connections in aircraft and aerospace equipment.

• Inch Series Dimensions
  EN 4563 exclusively covers tees in inch series sizes, ensuring compatibility with widely used pipe and tube systems in transatlantic and international aerospace applications.

• Dimensional and Performance Requirements

  • Configuration, dimensions, tolerances, and masses are clearly defined.
  • Tees are produced according to strict guidelines, supporting interchangeability and system standardization.

• Designation and Marking
  Components must be clearly marked in accordance with EN 2424-Marking of Aerospace Products, ensuring traceability and compliance.

• Pressure Classification
  All tees conform to Class D pressure ratings per ISO 6771, reflecting their suitability for moderate to high fluid pressures typically encountered in aerospace systems.

Applications

• Aerospace Hydraulic and Fuel Systems
  These welded tees are vital in routing hydraulic fluids and fuel in aircraft fluid networks, where reliability and thermal resistance are crucial.

• Aircraft and Spacecraft Assembly
  EN 4563 tees are specified in the assembly of both commercial and military aircraft, as well as spacecraft, providing standardization across global aerospace manufacturing.

• Maintenance and Upgrades
  Using standard-compliant pipe coupling tees facilitates easier maintenance, component replacement, and system upgrades across fleets and platforms.

• Interoperable Systems
  The inch series and standardized pressure ratings enable flexible integration into both new fluid system designs and retrofitting projects.

Related Standards

• ISO 6771
  Aerospace - Fluid systems and components - Pressure and temperature classifications. Defines pressure classes for aerospace fluid system components, including Class D, directly referenced by EN 4563.

• EN 2424
  Aerospace series - Marking of aerospace products. Specifies requirements for product marking and traceability.

• EN 4549
  Aerospace series - Pipe coupling, in heat resisting steel or in heat resisting nickel alloy - Coupling end, welded - Design configuration - Inch series.

• EN 4560
  Aerospace series - Pipe coupling, 37°, spherical, up to 21 000 kPa - Inch series - Technical specification.

• EN 3363, EN 3468, EN 3487
  Define the material properties for steels used in these components, ensuring strength and temperature resistance.

Conclusion

EN 4563:2003 plays a pivotal role in standardizing the manufacture and application of welded pipe coupling tees in heat resisting steel for aerospace systems using inch series sizes. Adherence to this standard improves system reliability, compatibility, and safety in aerospace fluid networks, supporting efficiency in both manufacturing and operations. For organizations seeking compliance in international aviation and aerospace projects, EN 4563 is a foundational reference for component selection and system integration.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling, welded, in heat resisting steel - Tees - Inch seriesLuft- und Raumfahrt - Rohrverschraubung zum Anschweißen aus hochwarmfestem Stahl - T-Stutzen - Inch-ReiheAerospace series - Pipe coupling, welded, in heat resisting steel - Tees - Inch series49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4563:2003SIST EN 4563:2004en01-maj-2004SIST EN 4563:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4563February 2003ICS 49.080English versionAerospace series - Pipe coupling, welded, in heat resisting steel- Tees - Inch seriesThis European Standard was approved by CEN on 14 September 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland andUnited Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 4563:2003 ESIST EN 4563:2004
...