SIST EN 4184:2004

Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 45° double, welded ends

This standard specifies the characteristics of elbows 45°, welded ends, for pipe couplings 8°30', in titanium alloy, for
aerospace applications.
Nominal pressure: up to 28 000 kPa
Temperature range:   55  C to 135  C

Luft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Winkelverschraubungen 45° mit Anschweißenden

Diese Norm legt die Eigenschaften von Winkelverschraubungen 45° mit Anschweißenden, für Rohrverschraubungen 8°30',
aus Titanlegierung, zur Verwendung in der Luft- und Raumfahrt fest.
Nenndruck: bis 28 000 kPa
Temperaturbereich:   55 °C bis 135 °C

Série aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords coudés a 45° doubles, a souder

La présente norme spécifie les caractéristiques des raccords coudés à 45° à souder, doubles, pour les systèmes de
raccordement 8°30', en alliage de titane, pour applications aérospatiales.
Pression nominale: jusqu'à 28 000 kPa
Plage de température:   55 °C à 135 °C

Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 45° double, welded ends

General Information

• Status: Published
• Publication Date: 30-Apr-2004
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: I08 - Imaginarni 08
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2004
• Due Date: 01-May-2004
• Completion Date: 01-May-2004
• Ref Project: EN 4184:2001 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 45° double, welded ends

Relations

• Refers: SIST EN 2656:2002 - Aerospace series - Pipe coupling - Coupling end, welded - Geometric configuration
• Effective Date: 28-Jan-2026
• Refers: SIST EN 3311:2024 - 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: SIST EN 3312:2012 - Aerospace series - Titanium alloy Ti-6Al-4V - Annealed - Forgings De ≤ 150 mm
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026
• Refers: SIST 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

Overview

SIST EN 4184:2004 defines the requirements for 45° double elbows with welded ends made from titanium alloy for use in aerospace fluid systems. These pipe couplings utilize an 8°30' angle, providing high performance for critical aerospace hydraulic and fluid applications. Published by the Slovenian Institute for Standardization (SIST), this standard is harmonized with EN 4184:2001 and supports the demanding operational needs of the aerospace sector.

Key specifications:

• Nominal pressure: up to 28,000 kPa
• Temperature range: -55°C to +135°C
• Material: Titanium alloy
• Configuration: 45° double elbows with welded ends

Adhering to this standard ensures product compatibility, safety, and interoperability across European and global aerospace supply chains.

Key Topics

SIST EN 4184:2004 covers the following essential areas for 45° titanium alloy pipe elbows:

• Scope & Application: Focuses on fluid system elbows used in aerospace, particularly where lightweight and high strength are required.
• Design Characteristics:
  • 45° double elbows
  • Welded ends for robust, permanent connection
  • Consistent with 8°30' pipe coupling systems
• Material Compliance: Specifies titanium alloys referenced in related standards (e.g., EN 3311, EN 3312, EN 3314, EN 3315)
• Dimensions & Tolerances: Provides standardized dimensions ensuring interchangeability
• Surface Finish: Sets surface roughness requirements for optimal performance
• Pressure & Temperature Ratings: Up to 28,000 kPa and from -55°C to 135°C, supporting high-performance aerospace systems
• Marking & Identification: Requires marking according to EN 2424, supporting traceability and quality assurance

Applications

The elbows specified by SIST EN 4184:2004 play a crucial role in aerospace and aviation fluid systems, offering durable and lightweight solutions:

• Hydraulic Systems: Used in aircraft hydraulic pipelines, ensuring reliable high-pressure operation
• Fuel & Cooling Lines: Suitable for transferring fluids where titanium’s corrosion resistance is essential
• Aerospace Manufacturing: Applicable in the assembly of aircraft, spacecraft, and related components where secure, high-integrity fluid fittings are mandatory
• Maintenance & Repairs: Standardization supports efficient replacement and maintenance, minimizing downtime

These elbows are chosen for their strength-to-weight ratio, corrosion resistance, and compatibility with demanding aerospace environments.

Related Standards

SIST EN 4184:2004 references several standards to ensure comprehensive specification for aerospace pipe couplings:

• EN 2424: Marking of aerospace products – ensures standardized product identification
• EN 2656: Pipe coupling - Coupling ends, welded - Geometric configuration
• EN 3275: Pipe coupling 8°30' up to 28,000 kPa - Dynamic beam seal - Metric series - Technical specification
• EN 3311, EN 3312, EN 3314, EN 3315: Titanium alloy material specifications for bars and forgings used in aerospace manufacturing

Conformance with these related standards assures compatibility, safety, and reliability across international aerospace applications.

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In summary, SIST EN 4184:2004 stands as a critical standard for specifying high-performance, welded titanium elbows in aerospace fluid systems. Its alignment with European and international standards makes it fundamental for manufacturers, engineers, and maintenance professionals in the aerospace industry looking to guarantee safety, reliability, and standardization.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2004
Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 45° double,
welded ends
Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 45° double, welded
ends
Luft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung -
Winkelverschraubungen 45° mit Anschweißenden
Série aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords
coudés a 45° doubles, a souder
Ta slovenski standard je istoveten z: EN 4184:2001
ICS:
49.080 /HWDOVNLLQYHVROMVNL Aerospace fluid systems and
KLGUDYOLþQLVLVWHPLLQGHOL components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 4184
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2001
ICS 49.080
English version
Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows
45°, welded ends
Série aérospatiale - Système de raccordement 8°30' en Luft- und Raumfahrt - Rohrverschraubung 8°30' aus
alliage de titane - Raccords coudés à 45°, à souder Titanlegierung - Winkelverschraubungen 45° mit
Anschweißenden
This European Standard was approved by CEN on 28 February 2001.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards 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 translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4184:2001 E
worldwide for CEN national Members.

Foreword
This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA).
After inquiries and votes carried out in accordance with the rules of this Association, this Standard has received the
approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation
to CEN.
This European Standard shall be given the status of a national standard, either by publication of an identical text or by
endorsement, at the latest by April 2002, and conflicting national standards shall be withdrawn at the latest by April 2002.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are
bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany,
Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United
Kingdom.
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