SIST EN 3246:2004

Aerospace series - Pipe coupling 8°30' in titanium alloy - Unions, straight, bulkhead

This standard specifies the characteristics of straight, bulkhead unions 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 Schottverschraubungen

Diese Norm legt die Eigenschaften von geraden Schottverschraubungen 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 droits pour traversée de cloison

La présente norme spécifie les caractéristiques des raccords droits, pour traversée de cloison, 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 - Unions, bulkhead

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 3246:2001 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Unions, straight, bulkhead

Overview

EN 3246:2001 specifies the characteristics of straight, bulkhead unions for pipe coupling 8°30' in titanium alloy intended for aerospace fluid systems. Published by CEN and prepared by AECMA, the standard applies to unions rated for a nominal pressure up to 28 000 kPa and a temperature range of −55 °C to 135 °C. It defines configuration, materials, surface treatment, marking and installation requirements to ensure interchangeability, safety and performance in aircraft and aerospace applications.

Key topics and requirements

• Scope and performance
  • Straight, bulkhead unions for 8°30' pipe couplings in titanium alloy for aerospace service.
  • Rated up to 28 000 kPa and temperatures from −55 °C to 135 °C.
• Configuration and dimensions
  • Dimensional requirements are given by figure and table references in the standard (manufacturer options allowed only when EN 3275 qualification/acceptance is met).
  • Threads follow aerospace MJ thread limits (see ISO 5855-3).
• Materials
  • Titanium alloys referenced by EN 3311 / EN 3314 for specific material conditions (annealed, solution treated and aged).
• Surface treatment and lubrication
  • Surfaces to be abrasive blasted with non‑metallic grit prior to lubrication.
  • Lubrication of threads and sealing faces per EN 2491 (molybdenum disulphide dry lubricant methods).
  • Specified lubricant film thickness: 0.005 mm to 0.013 mm.
• Surface roughness and sealing
  • Surface finish requirements referenced to figures in the standard and to EN 3274 for sealing face forms.
• Marking and traceability
  • Marking style A per EN 2424, including identity and designation blocks for traceability.
• Installation
  • Installation dimensions and grip length for bulkhead unions are defined (see figure 2), and washers conform to EN 3267.
• Qualification and acceptance
  • Technical specification and acceptance criteria referenced to EN 3275, type II.

Practical applications

• Use EN 3246:2001 when specifying, procuring, designing, manufacturing or inspecting aerospace titanium bulkhead unions for hydraulic, fuel, pneumatic and other fluid systems where high pressure and temperature variation occur.
• Common applications:
  • Aircraft and spacecraft fluid lines requiring lightweight, corrosion‑resistant fittings.
  • Repair and overhaul shops ensuring replacement parts meet aerospace interchangeability.
  • Component suppliers and OEMs specifying coupling interfaces for certification and maintenance.

Who should use this standard

• Aerospace design and systems engineers
• Procurement specialists and specification writers
• Manufacturers of titanium pipe fittings and unions
• Quality, test and certification engineers in aerospace maintenance and production

Related standards

• ISO 5855-3 (MJ threads)
• EN 3274 (thread end, geometric configuration)
• EN 3275 (dynamic beam seal / technical specification)
• EN 3267 (washers, bulkhead, titanium)
• EN 2491 (molybdenum disulphide dry lubricants)
• EN 3311 / EN 3314 (titanium alloy material specifications)
• EN 2424 (marking of aerospace products)

Keywords: EN 3246:2001, pipe coupling 8°30', titanium alloy unions, bulkhead unions, aerospace pipe fittings, nominal pressure 28 000 kPa, −55 °C to 135 °C, AECMA, CEN.

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, bulkheadLuft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Gerade SchottverschraubungenSérie aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords droits pour traversée de cloisonAerospace series - Pipe coupling 8°30' in titanium alloy - Unions, straight, bulkhead49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 3246:2001SIST EN 3246:2004en01-maj-2004SIST EN 3246:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 3246October 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' in titanium alloy -Unions, bulkheadSérie aérospatiale - Système de raccordement 8°30' enalliage de titane - Raccords droits pour traversée de cloisonLuft- und Raumfahrt - Rohrverschraubung 8°30' ausTitanlegierung - Gerade SchottverschraubungenThis European Standard was approved by CEN on 6 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 3246:2001 ESIST EN 3246:2004
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