EN 4553:2003
(Main)Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Elbow 90° nipples, welded end - Inch series
Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Elbow 90° nipples, welded end - Inch series
This standard specifies the characteristics of welded elbow 90° nipples for inch series pipe couplings, 37°, spherical, in heat resisting steel, for aerospace applications.
Nominal pressure : Class D in accordance with ISO 6771
Luft- und Raumfahrt - Rohrverschraubung 37° mit Kugelbuchse, aus hochwarmfestem Stahl - Winkelverschraubungen 90° zum Anschweißen - Inch-Reihe
Diese Norm legt die Eigenschaften von Winkelverschraubungen 90° zum Anschweißen für Rohrverschraubungen 37° mit Kugelbuchse der Inch Reihe aus hochwarmfestem Stahl für Anwendungen in der Luft- und Raumfahrt fest.
Nenndruck: Klasse D nach ISO 6771.
Série aérospatiale - Système de raccordement sphérique 37°, en acier résistant à chaud - Mamelons coudés à 90° à souder - Série inch
Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Elbow 90° nipples, welded end - Inch series
General Information
Overview
EN 4553:2003 is a European standard developed by the European Committee for Standardization (CEN), specifying requirements for welded elbow 90° nipples used in aerospace fluid systems. These pipe couplings feature a 37° spherical design and are made from heat-resisting steel, meeting high-performance demands in aerospace applications. The standard is part of the aerospace series and applies to the inch series of pipe couplings, ensuring interoperability and reliability across international aerospace industries.
The standard defines product characteristics such as dimensions, tolerances, materials, marking, and technical specifications to ensure consistent quality and compatibility. Compliance with this standard includes meeting Class D nominal pressure ratings as per the ISO 6771 classification, essential for safety and functionality in aerospace fluid systems.
Key Topics
- Product Characteristics: Defines the geometry of 90° elbow nipples, including dimensions, tolerances, thread specifications, and mass, facilitating consistent manufacturing and quality control.
- Materials: Specifies heat-resisting steel grades compliant with EN 3363, EN 3468, or EN 3487, each with minimum hardness requirements (HB > 140) to withstand extreme aerospace operational environments.
- Nominal Pressure: Rated at Class D according to ISO 6771, ensuring adequate performance under high-pressure conditions typical in aerospace fluid systems.
- Marking and Identification: Requires standardized marking following EN 2424 standards for traceability and conformity.
- Technical Specifications: Follows EN 4560 guidelines for detailed performance and quality requirements.
- Interchangeability: Inch series sizing with 37° spherical interface promotes compatibility within the aerospace supply chain and with other standards like EN 4550-1.
Applications
EN 4553:2003 compliant elbow 90° nipples are primarily used within:
- Aerospace fluid systems where reliable pipe connections are critical for hydraulic, fuel, and pneumatic circuits.
- High-temperature environments due to the use of heat-resistant steel materials.
- Safety-critical assemblies requiring rigorous pressure classifications and material integrity.
- Maintenance and manufacturing workflows demanding uniform dimensions and marking to simplify part replacement and inspection.
- Aerospace component production by manufacturers and suppliers aiming to comply with both European and international aerospace standards.
Related Standards
To fully implement EN 4553:2003 requirements, the following related standards provide complementary guidance:
- ISO 6771 – Pressure and temperature classifications for aerospace fluid systems ensuring pressure rating consistency.
- EN 2424 – Standards for aerospace product marking, ensuring traceability.
- EN 3363, EN 3468, EN 3487 – Specifications for heat-resisting steel materials tailored for aerospace parts.
- EN 4549 – Specifications for coupling ends and weld configurations, aligning with the pipe coupling interface.
- EN 4550-1 – Defines design configuration for 37° spherical pipe couplings, helping ensure component compatibility.
- EN 4560 – Technical specification for aerospace pipe couplings, detailing performance criteria.
Adhering to EN 4553:2003 standard ensures the manufacture and use of dependable, high-quality elbow nipples designed for the rigorous demands of aerospace fluid systems. It supports international harmonization, safety, and performance consistency within the aerospace industry supply chain.
Frequently Asked Questions
EN 4553:2003 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Elbow 90° nipples, welded end - Inch series". This standard covers: This standard specifies the characteristics of welded elbow 90° nipples for inch series pipe couplings, 37°, spherical, in heat resisting steel, for aerospace applications. Nominal pressure : Class D in accordance with ISO 6771
This standard specifies the characteristics of welded elbow 90° nipples for inch series pipe couplings, 37°, spherical, in heat resisting steel, for aerospace applications. Nominal pressure : Class D in accordance with ISO 6771
EN 4553:2003 is classified under the following ICS (International Classification for Standards) categories: 49.080 - Aerospace fluid systems and components. The ICS classification helps identify the subject area and facilitates finding related standards.
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Elbow 90° nipples, welded end - Inch seriesLuft- und Raumfahrt - Rohrverschraubung 37° mit Kugelbuchse, aus hochwarmfestem Stahl - Winkelverschraubungen 90° zum Anschweißen - Inch-ReiheSérie aérospatiale - Systeme de raccordement sphérique 37°, en acier résistant a chaud - Mamelons coudés a 90° a souder - Série inchAerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Elbow 90° nipples, welded end - Inch series49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4553:2003SIST EN 4553:2004en01-maj-2004SIST EN 4553:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4553February 2003ICS 49.080English versionAerospace series - Pipe coupling 37°, spherical, in heat resistingsteel - Elbow 90° nipples, welded end - Inch seriesSérie aérospatiale - Système de raccordement sphérique37°, en acier résistant à chaud - Mamelons coudés à 90° àsouder - Série inchThis 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 4553:2003 ESIST EN 4553:2004
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