EN 4233:2001
(Main)Aerospace series - Pipe coupling 8°30' in titanium alloy - Unions, welded end, threaded
Aerospace series - Pipe coupling 8°30' in titanium alloy - Unions, welded end, threaded
This standard specifies the characteristics of unions, welded end, threaded 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 - Gerade Verschraubungen mit Anschweißende
Diese Norm legt die Eigenschaften von geraden Verschraubungen mit Anschweißende 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 - Système de raccordement 8°30' en alliage de titane - Raccords droits, à souder, filetés
La présente norme spécifie les caractéristiques des raccords droits, à souder, filetés, pour les systèmes de raccorde-ment 8°30', en alliage de titane, pour applications aérospatiales.
Pression nominale: jusqu'à 28 000 kPa
Plage de températures: - 55 °C à 135 °C
Aerospace series - Pipe coupling 8°30' in titanium alloy - Unions, welded end, threaded
General Information
Overview
EN 4233:2001 is a European standard developed by CEN that specifies the characteristics of pipe coupling unions with welded ends and threaded connections made from titanium alloy. This standard is part of the aerospace series and targets pipe couplings designed with a precise 8°30' angle, intended for high-performance aerospace fluid systems. It ensures reliable mechanical, thermal, and pressure resistance properties crucial for aerospace applications operating under challenging environmental conditions.
The standard governs the use of titanium alloy unions with a nominal pressure capacity of up to 28,000 kPa and a temperature operating range from -55 °C to 135 °C. These specifications support the safety, durability, and interoperability of critical aerospace components.
Key Topics
Material Specifications
The pipe couplings must be manufactured from titanium alloy compliant with EN 3311 or EN 3314 standards, ensuring high strength-to-weight ratio, corrosion resistance, and suitability for aerospace environments.Design and Dimensions
The standard details dimensions, mass, and thread characteristics based on aerospace requirements. Critical dimensions and geometric configurations conform to EN 2656 (welded coupling ends) and EN 3274 (thread ends), ensuring compatibility and interchangeability.Surface Treatment and Lubrication
Welded ends are without surface treatment except for a 10 mm minimum on outside and bore diameter. Threads and sealing faces require lubrication following EN 2491, applied over a blast-cleaned surface to enhance sealing and reduce friction.Pressure and Temperature Ratings
Designed for nominal pressures up to 28,000 kPa and operating temperatures from -55 °C to 135 °C, suitable for aerospace fluid systems handling highly pressurized fluids under extreme thermal conditions.Marking and Identification
Labels and marks follow EN 2424 requirements for aerospace products, allowing clear identification of part numbers, compliance, and traceability, critical for quality assurance in aerospace manufacturing.
Applications
EN 4233:2001 pipe coupling unions are specifically engineered for use in aerospace fluid systems, including:
- Hydraulic and pneumatic lines in aircraft and spacecraft requiring high-pressure resistance
- Fuel and coolant transport systems where titanium alloy's corrosion resistance is crucial
- Components exposed to significant thermal variation demanding stable mechanical properties
- Assembly and maintenance operations benefiting from standardized threaded and welded unions ensuring leak-tight connections and ease of installation
Titanium alloy pipe couplings adhering to this standard improve system reliability, weight optimization, and safety in aerospace engineering projects.
Related Standards
This standard complements and references several important aerospace and material specifications, including:
- EN 2656 – Aerospace series, pipe coupling welded ends – geometric configuration
- EN 3274 – Aerospace series, pipe coupling threaded ends – geometric configurations
- EN 3275 – Technical specification for aerospace pipe coupling 8°30' dynamic beam seal
- EN 2491 – Aerospace dry lubricants for threaded and sealing surfaces
- EN 3311 / EN 3314 – Titanium alloy bars for machining, specifying material conditions and quality
- EN 2424 – Marking requirements for aerospace products
- ISO 5855-3 – MJ threads limit dimensions for fluid system fittings
Together, these standards create a robust framework that supports the production, assembly, and qualification of titanium alloy pipe couplings for aerospace applications.
Keywords: EN 4233:2001, aerospace pipe coupling, titanium alloy, welded end unions, threaded pipe fittings, high-pressure aerospace components, aerospace fluid systems, titanium pipe couplings, aerospace material standards, aircraft hydraulic fittings.
Frequently Asked Questions
EN 4233:2001 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Pipe coupling 8°30' in titanium alloy - Unions, welded end, threaded". This standard covers: This standard specifies the characteristics of unions, welded end, threaded 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
This standard specifies the characteristics of unions, welded end, threaded 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
EN 4233:2001 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 8°30' in titanium alloy - Unions, welded end, threadedLuft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Gerade Verschraubungen mit AnschweißendeSérie aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords droits, a souder, filetésAerospace series - Pipe coupling 8°30' in titanium alloy - Unions, welded end, threaded49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4233:2001SIST EN 4233:2004en01-maj-2004SIST EN 4233:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4233October 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' in titanium alloy -Unions, welded, threadedSérie aérospatiale - Système de raccordement 8°30' enalliage de titane - Raccords droits, soudés, filetésLuft- und Raumfahrt - Rohrverschraubung 8°30' ausTitanlegierung - Gerade Verschraubungen zumAnschweißenThis European Standard was approved by CEN on 1 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 4233:2001 ESIST EN 4233:2004
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