SIST EN 4554:2004
(Main)Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight unions, threaded - Inch series
Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight unions, threaded - Inch series
This standard specifies the characteristics of straight unions for inch series pipe couplings, 37°, spherical, in heat resisting steel, for aerospace applications.
Connect with fluid system component with port connection in accordance with prEN 4550-3.
Nominal pressure : Class D in accordance with ISO 6771
Luft- und Raumfahrt - Rohrverschraubung 37° mit Kugelbuchse, aus hochwarmfestem Stahl - Gerade Einschraubverschraubungen - Inch-Reihe
Diese Norm legt die Eigenschaft von geraden Einschraubverschraubungen für Rohrverschraubungen 37° mit Kugelbuchse der Inch Reihe aus hochwarmfestem Stahl für Anwendungen in der Luft- und Raumfahrt fest.
Die Verschraubung ist in Bauteile von fluidischen Systemen mit Einschraublöchern nach EN 4550 3 einzuschrauben.
Nenndruck: Klasse D nach ISO 6771.
Série aérospatiale - Systeme de raccordement sphérique 37°, en acier résistant a chaud - Mamelons droits a implanter - Série inch
Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight unions, threaded - Inch series
General Information
Overview
SIST EN 4554:2004 is a European Standard developed by CEN that defines strict specifications for aerospace-grade pipe couplings. Specifically, it covers 37° spherical pipe coupling straight unions, made of heat resisting steel and designed for inch series threaded connections. These couplings are essential components in aerospace fluid systems, ensuring reliable and safe connections under demanding operating conditions.
The standard includes details on configuration, dimension tolerances, materials, marking, and technical requirements. It supports connections with fluid system components via port connections conforming to EN 4550-3. Additionally, it aligns with ISO pressure class D according to ISO 6771, underscoring suitability for high-pressure aerospace applications.
Key Topics
Design and Configuration
Focus is placed on the 37° spherical seating angle and straight union type for pipe couplings. Thread types comply with aerospace-UNJ standards, ensuring uniform interchangeability.Materials
High-grade, heat resistant steels are mandated, notably those complying with EN 3468 or EN 3487. These steels provide enhanced durability and hardness (minimum HB > 140), suitable for extreme thermal environments common in aerospace.Dimensional Tolerances and Mass
Precise control of dimensions is required, including thread size, nominal diameter, and overall lengths. Masses are specified for batches of 1000 parts to maintain consistency in manufacturing.Locking Wire Hole Options
Couplings may include provisions for locking wire holes to further secure connections, critical for safety in aerospace fluid systems.Marking and Traceability
According to EN 2424 guidelines, couplings must carry clear markings allowing identification and traceability to meet stringent aerospace quality standards.Technical Specification
The standard conforms to EN 4560 technical specifications for 37° spherical pipe couplings, ensuring robust performance under pressures up to 21,000 kPa.
Applications
SIST EN 4554:2004 couplings are primarily used in the aerospace industry within various fluid handling systems. Typical applications include:
Hydraulic Systems
Ensuring leak-proof, temperature-resistant connections critical in flight control actuators, landing gear systems, and braking systems.Fuel and Oil Lines
Providing secure and corrosion-resistant pipe joints vital to fuel delivery and lubrication systems.Pneumatic Systems
Facilitating high-pressure air flow connections where precision and reliability are mandatory.
This standard enables aerospace manufacturers and suppliers to produce and verify components that meet uniform performance criteria, enhance system reliability, and comply with international aerospace quality regulations.
Related Standards
SIST EN 4554:2004 should be considered alongside several complementary standards for complete system integration and compliance:
EN 4550 Series
- EN 4550-1: Male sealing ends for 37° pipe couplings
- EN 4550-2: Port ends design configurations
- EN 4550-3: Port connections (interface compatibility for coupling connections)
ISO 3161
Aerospace UNJ threads - general requirements and dimensional tolerances relevant for threading aspects.ISO 6771
Classification of aerospace fluid system components by pressure and temperature ratings.EN 3424
Aerospace product marking requirements ensuring traceability and quality control.EN 4560
Technical specifications for 37° spherical pipe couplings up to 21,000 kPa pressure ratings.
Adhering to SIST EN 4554:2004 ensures aerospace fluid system components achieve optimal performance, safety, and compatibility within critical high-pressure environments. Manufacturers and engineers focusing on aerospace hydraulic, fuel, and pneumatic systems benefit from applying this standard to maintain stringent quality and reliability benchmarks.
Frequently Asked Questions
SIST EN 4554:2004 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight unions, threaded - Inch series". This standard covers: This standard specifies the characteristics of straight unions for inch series pipe couplings, 37°, spherical, in heat resisting steel, for aerospace applications. Connect with fluid system component with port connection in accordance with prEN 4550-3. Nominal pressure : Class D in accordance with ISO 6771
This standard specifies the characteristics of straight unions for inch series pipe couplings, 37°, spherical, in heat resisting steel, for aerospace applications. Connect with fluid system component with port connection in accordance with prEN 4550-3. Nominal pressure : Class D in accordance with ISO 6771
SIST EN 4554:2004 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 - Straight unions, threaded - Inch seriesLuft- und Raumfahrt - Rohrverschraubung 37° mit Kugelbuchse, aus hochwarmfestem Stahl - Gerade Einschraubverschraubungen - Inch-ReiheSérie aérospatiale - Systeme de raccordement sphérique 37°, en acier résistant a chaud - Mamelons droits a implanter - Série inchAerospace series - Pipe coupling 37°, spherical, in heat resisting steel - Straight unions, threaded - Inch series49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4554:2003SIST EN 4554:2004en01-maj-2004SIST EN 4554:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4554February 2003ICS 49.080English versionAerospace series - Pipe coupling 37°, spherical, in heat resistingsteel - Straight unions, threaded - Inch seriesSérie aérospatiale - Système de raccordement sphérique37°, en acier résistant à chaud - Mamelons droits àimplanter - 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 4554:2003 ESIST EN 4554:2004
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