EN 3081:2001

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 - Système de raccordement 8°30' en alliage de titane - Olives à souder avec joint à lèvre, 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: 18-Sep-2001
• Withdrawal Date: 30-Mar-2002
• 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: 31-May-2017
• Completion Date: 11-Feb-2026
• Ref Project: SIST EN 3081:2002 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Ferrules, welded with dynamic beam seal end, for repair

Relations

• Refers: EN 3243:2001 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Ferrules, welded, with dynamic beam seal end
• Effective Date: 28-Jan-2026
• Refers: EN 2656:2001 - Aerospace series - Pipe coupling - Coupling end, welded - Geometric configuration
• Effective Date: 28-Jan-2026
• Refers: EN 3275:2019 - Aerospace series - Pipe coupling 8°30' up to 28 000 kPa Dynamic beam seal - Metric series - Technical specification
• Effective Date: 28-Jan-2026
• Refers: EN 3311:2023 - Aerospace series - Titanium alloy TI-P64001 (Ti-6Al-4V) - Annealed - Bars for machining - D ≤ 300 mm - 900 MPa ≤ Rm ≤ 1 160 MPa
• Effective Date: 28-Jan-2026
• Refers: EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026
• Refers: EN 3272:2001 - Aerospace series - Pipe coupling 8°30' - Dynamic beam seal end for ferrule, welded - Geometric configuration
• Effective Date: 28-Jan-2026

Overview

EN 3081:2001 is a European standard developed by CEN for the aerospace sector, focusing on pipe couplings with an 8°30' cone angle in titanium alloy. Specifically, it details the requirements for welded ferrules with dynamic beam seal end, designed as repair solutions to replace components conforming to EN 3243. These titanium alloy ferrules are engineered for high-performance aerospace fluid systems subject to operating pressures up to 28,000 kPa and temperatures between -55°C and 135°C.

The standard ensures that critical repair couplings deliver reliability, compatibility, and safety within demanding aerospace environments.

Key Topics

• Titanium Alloy Construction: Leverages the strength-to-weight benefits and corrosion resistance of titanium alloys, essential for aerospace fluid system applications.
• 8°30' Pipe Coupling Interface: Standardizes the geometric interface for repair ferrules to ensure system integration and compatibility.
• Dynamic Beam Seal End: Enhances leakage protection with a robust sealing design, supporting mission-critical operations.
• Welded Ferrule Design: Specifies welding requirements, surface finishes, material specifications (referencing EN 3311 and EN 3314), and dimensional tolerances for reliable in-service repairs.
• Pressure and Temperature Ratings: Qualified for usage up to 28,000 kPa and in the temperature range from -55°C to 135°C, supporting a broad spectrum of aerospace applications.
• Replacement for EN 3243: Provides backward compatibility and an upgrade path for systems originally built to EN 3243.

Applications

EN 3081:2001 applies to aerospace fluid systems where high strength, durability, and performance under extreme conditions are critical. Typical applications include:

• In-Service Repairs: Facilitates the effective replacement of damaged or worn ferrules in existing titanium fluid lines without the need for complete system overhaul.
• Hydraulic and Fuel Systems: Supports leak-tight connections in hydraulic, pneumatic, or fuel lines operating at high pressure and varying temperatures.
• Maintenance and MRO Operations: Aerospace maintenance teams, MRO (Maintenance, Repair, and Overhaul) centers, and repair workshops benefit from standardized, interchangeable repair parts, expediting service and minimizing downtime.
• Compatibility Upgrades: Ensures existing EN 3243-compliant systems can be efficiently updated with improved sealing and stress performance.

Implementing EN 3081:2001 across aerospace platforms-ranging from commercial aircraft to defense and space vehicles-supports long-term system sustainability, safety, and regulatory compliance.

Related Standards

For complete alignment and optimal implementation, EN 3081:2001 should be used alongside the following standards:

• EN 3243: Previous specification for 8°30' titanium alloy ferrules; EN 3081:2001 is intended as its replacement for repairs.
• EN 2424: Guidance on marking aerospace products, including ferrules per EN 3081:2001.
• EN 2656: Details coupling end configurations for welded aerospace pipe couplings.
• EN 3272: Provides the geometric configuration for dynamic beam seal ferrules.
• EN 3275: Specifies technical requirements for dynamic beam seals in the metric series.
• EN 3311 / EN 3314: Material standards for titanium alloy bar stock used in the production of ferrules.

By adhering to EN 3081:2001 and its referenced standards, aerospace manufacturers, repair centers, and suppliers can ensure proper system function, maintain safety, and fulfill international regulatory requirements.

Keywords: EN 3081:2001, aerospace, pipe coupling, titanium alloy, ferrules, welded, dynamic beam seal, repair coupling, fluid systems, standards, CEN, high pressure, aerospace repair, fluid line repair, standardization.

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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