SIST EN 3081:2002

Aerospace series - Pipe coupling 8°30' in titanium alloy - Ferrules, welded with dynamic beam seal end, for repair

This standard specifies the characteristics of welded ferrules with dynamic beam seal end for pipe couplings 8°30', in
titanium alloy, for aerospace applications, to used as repair couplings to replace EN 3243.
Nominal pressure: up to 28 000 kPa
Temperature range:   55 °C to 135 °C

Luft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Anschweißstutzen mit Dichtlippe, für Reparatur

Diese Norm legt die Eigenschaften von Anschweißstutzen, mit Dichtlippe, für Rohrverschraubungen 8°30' aus
Titanlegierung, zur Verwendung in der Luft- und Raumfahrt fest, die für Reparaturzwecke zum Austausch gegen Stutzen
nach EN 3243 zu verwenden sind.
Nenndruck: bis 28 000 kPa
Temperaturbereich:   55 °C bis 135 °C

Série aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Olives a souder avec joint a levre, pour réparation

La présente norme spécifie les caractéristiques des olives à souder, avec joint à lèvre, pour les systèmes de raccordement
8°30', en alliage de titane, pour applications aérospatiales, à utiliser comme éléments de réparation en remplacement de
EN 3243.
Pression nominale: jusqu'à 28 000 kPa
Plage de température:   55 °C à 135 °C

Aerospace series - Pipe coupling 8-30' in titanium alloy - Ferrules, welded with dynamic beam seal end, for repair

General Information

• Status: Published
• Publication Date: 31-Dec-2001
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2002
• Due Date: 01-Jan-2002
• Completion Date: 01-Jan-2002
• Ref Project: EN 3081:2001 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Ferrules, welded with dynamic beam seal end, for repair

Overview

SIST EN 3081:2002 is a European standard developed by CEN that specifies requirements for aerospace series pipe couplings in titanium alloy, featuring ferrules welded with a dynamic beam seal end designed for repair applications. This standard replaces the earlier EN 3243 specification and is primarily applied in aerospace fluid systems where reliability, pressure resistance, and corrosion resistance are critical.

The standard is targeted at pipe couplings with a precise angular specification of 8°30' and is engineered to withstand nominal pressures of up to 28,000 kPa (about 280 bar) and operate effectively in temperature ranges from -55 °C to 135 °C. The titanium alloy construction ensures optimal strength-to-weight ratio and durability in demanding aerospace environments.

Key Topics

1. Material Specifications

EN 3081 mandates the use of titanium alloys compliant with EN 3311 (annealed) and EN 3314 (solution treated and aged) to ensure excellent mechanical and corrosion resistance properties necessary for aerospace applications.

2. Geometric and Dimensional Requirements

• The ferrules have precise dimensional tolerances, with flexibility in unspecified dimensions left to the manufacturer’s discretion, provided they meet the qualification and acceptance criteria detailed in EN 3275 Type II.
• Surface roughness and marking areas follow strict guidelines for performance consistency and traceability, as referenced from EN 2656 and EN 3272.

3. Pressure and Temperature Rating

• The pipe couplings are designed for nominal pressures up to 28,000 kPa, addressing high-stress aerospace systems.
• Operability is guaranteed within a temperature window between -55 °C and 135 °C, suitable for various aerospace fluid transport scenarios.

4. Marking and Traceability

• Marking requirements follow EN 2424 standards, including style F and style G for permanent identification. This ensures each component can be tracked back to manufacturing batches for quality control and certification purposes.

5. Technical Requirements

• The dynamic beam seal end welded ferrules conform to technical specifications outlined in EN 3275, which covers coupling geometry, seal design, and weld quality – essential for leak-tight and vibration-resistant installations.

Applications

SIST EN 3081:2002 pipe couplings are specialized components used predominantly in aerospace fluid systems and components where safety and performance are critical. Typical applications include:

• Repair of titanium alloy pipe systems in aircraft hydraulic, fuel, or pneumatic circuits where original couplings require replacement without full system disassembly.
• Maintenance and overhaul operations within aerospace maintenance facilities to extend the service life of critical tubing systems.
• High-pressure fluid transport environments in aerospace vehicles that demand corrosion resistance combined with high mechanical integrity.

These couplings allow for reliable, efficient repairs conforming to strict aerospace safety standards, minimizing downtime and ensuring continued airworthiness.

Related Standards

EN 3081 integrates with and supersedes several related aerospace standards to provide a cohesive framework for pipe coupling design and repair:

• EN 3243 – Former standard for titanium alloy pipe coupling ferrules with dynamic beam seals, now replaced by EN 3081.
• EN 3275 – Defines the technical specification for dynamic beam seal ends on ferrules to guarantee proper weld and sealing performance.
• EN 2656 – Covers coupling end geometric configuration and compatibility essential for assembly integrity.
• EN 3311 / EN 3314 – Material standards for titanium alloys tailored for aerospace-grade machining and fabrication.
• EN 2424 – Aerospace product marking standard ensuring traceability and compliance across components.

Compliance with EN 3081 ensures harmonized quality and interchangeability of pipe repair couplings within the aerospace industry, supporting operational reliability and certification requirements.

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Keywords: EN 3081, aerospace pipe coupling, titanium alloy ferrules, dynamic beam seal, repair couplings, high-pressure pipe fittings, aerospace fluid systems, titanium pipe repair, aviation hydraulic couplings, aerospace standard, CEN aerospace standards.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling 8-30' in titanium alloy - Ferrules, welded with dynamic beam seal end, for repairLuft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Anschweißstutzenmit Dichtlippe, für ReparaturSérie aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Olives a souder avec joint a levre, pour réparationAerospace series - Pipe coupling 8°30' in titanium alloy - Ferrules, welded with dynamic beam seal end, for repair49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 3081:2001SIST EN 3081:2002en01-januar-2002SIST EN 3081:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3081September 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' in titanium alloy -Ferrules, welded with dynamic beam seal end, for repairSérie aérospatiale - Système de raccordement 8°30' enalliage de titane - Olive à souder avec joint à lèvre, pourréparationLuft- und Raumfahrt - Rohrverschraubung 8°30' ausTitanlegierung - Anschweißstutzen mit Dichtlippe, fürReparaturThis European Standard was approved by CEN on 20 January 2001.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,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 3081:2001 ESIST EN 3081:2002
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