SIST EN 3268:2015

Aerospace series - Pipe coupling 8°30' in titanium alloy - Pressure plugs

This European Standard specifies the characteristics of pressure plugs for pipe couplings 8°30’, in titanium alloy, for aerospace applications.

Luft- und raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Blindverschraubungen

Série aérospatiale - Système de raccordement 8°30' en alliage de titane - Obturateurs de tuyauterie

La présente Norme Européenne spécifie les caractéristiques requises des obturateurs de tuyauteries pour les systèmes de raccordement 830', en alliage de titane, pour applications aérospatiales.

Aeronavtika - Cevni priključek 8°30' iz titanove zlitine - Tlačni vtiči (slepi priključki)

Ta evropski standard določa lastnosti tlačnih vtičev (slepih priključkov) za cevne priključke 8°30’, iz titanove zlitine, za uporabo v aeronavtiki.

General Information

• Status: Published
• Publication Date: 01-Dec-2014
• ICS: 49.025.30 - Titanium
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Nov-2014
• Due Date: 11-Jan-2015
• Completion Date: 02-Dec-2014
• Ref Project: EN 3268:2014 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Pressure plugs

Relations

• Replaces: SIST EN 3268:2004 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Pressure plugs
• Effective Date: 01-Jan-2015

Overview

SIST EN 3268:2015 is a European Standard developed by CEN that defines the specifications for pressure plugs used in pipe couplings 8°30' made from titanium alloy specifically for aerospace applications. This standard ensures compatibility, safety, and performance consistency across aerospace fluid systems that rely on these components. It replaces the earlier EN 3268:2001 and aligns with various aerospace and defense industry requirements.

The document covers essential aspects such as design, dimensions, surface roughness, materials, surface treatments, marking, and technical specifications to ensure high reliability and durability in aerospace environments.

Key Topics

• Scope and Application: Specifies pressure plugs used in 8°30' titanium alloy pipe couplings for aerospace systems.
• Materials: Titanium alloy as defined in EN 3311 and EN 3314, ensuring high strength, corrosion resistance, and lightweight properties ideal for aerospace.
• Design and Dimensions: Precise geometric configurations standardized per EN 3274 with dimensional tolerances and mass data listed for multiple sizes, guaranteeing interchangeability.
• Surface Treatment: Lubrication requirements based on EN 2491 for thread and sealing surfaces with optional red coating according to MIL-PRF-24635 and FED-STD-595 color codes. Surface prep includes abrasive blasting.
• Marking Requirements: Following EN 2424 for consistent identification and warnings, particularly emphasizing that red-coated plugs are non-flightworthy and must be removed prior to operation.
• Technical Specifications: Referencing EN 3275 for dynamic beam seals and performance characteristics under pressure up to 28,000 kPa.

Applications

SIST EN 3268:2015 pressure plugs are critical components in aerospace fluid systems, where pipe couplings must maintain high integrity under demanding conditions including:

• Hydraulic lines and fuel systems in aircraft and spacecraft
• High-pressure fluid transfer assemblies
• Aerospace maintenance and manufacturing processes requiring standardized parts
• Systems demanding lightweight, corrosion-resistant materials such as titanium alloys to reduce weight without sacrificing strength
• Situations where secure and reliable sealing is mandatory to avoid leaks and ensure safety under pressure stresses

Using plugs compliant with EN 3268 enhances operational safety, ensures regulatory compliance, and facilitates global interoperability of aerospace components.

Related Standards

• EN 2424: Aerospace series - Marking of aerospace products
• EN 2491: Aerospace series - Molybdenum disulphide dry lubricants and coating methods
• EN 3274: Aerospace series - Pipe coupling 8°30' thread end geometric configuration
• EN 3275: Aerospace series - Pipe coupling 8°30' dynamic beam seal specifications
• EN 3311 / EN 3314: Aerospace series - Titanium alloy TI-P64001 material specifications
• ISO 5855-3: Aerospace - MJ threads - Limit dimensions for fluid system fittings
• MIL-PRF-24635: Coating systems for weather resistant exterior use (Military specification)
• FED-STD-595: Federal Standard for color codes used in government procurement

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Keywords: SIST EN 3268:2015, aerospace pressure plugs, titanium alloy pipe coupling, pipe coupling 8°30', aerospace fluid systems, titanium alloy plugs, aerospace sealing standards, aerospace component marking, aerospace standard CEN, aerospace pipe fittings, pipe coupling pressure plugs, aerospace hydraulic systems.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2015
1DGRPHãþD
SIST EN 3268:2004
$HURQDYWLND&HYQLSULNOMXþHNƒ
L]WLWDQRYH]OLWLQH7ODþQLYWLþLVOHSLSULNOMXþNL
Aerospace series - Pipe coupling 8°30' in titanium alloy - Pressure plugs
Luft- und raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung -
Blindverschraubungen
Série aérospatiale - Système de raccordement 8°30' en alliage de titane - Obturateurs de
tuyauterie
Ta slovenski standard je istoveten z: EN 3268:2014
ICS:
49.025.30 Titan Titanium
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 3268
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2014
ICS 49.080 Supersedes EN 3268:2001
English Version
Aerospace series - Pipe coupling 8°30' in titanium alloy -
Pressure plugs
Série aérospatiale - Système de raccordement 8°30' en Luft- und Raumfahrt - Rohrverschraubung 8°30' aus
alliage de titane - Obturateurs de tuyauterie Titanlegierung - Blindverschraubungen
This European Standard was approved by CEN on 4 January 2014.

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 CEN-CENELEC 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 CEN-CENELEC Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 3268:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Required characteristics .4
3.1 Configuration – Dimensions – Mass .4
3.2 Surface roughness .4
3.3 Materials .4
3.4 Surface treatment .4
4 Designation .6
5 Marking .7
6 Technical specification .7
Annex A (informative) Standard evolution form .8

Foreword
This document (EN 3268:2014) has been prepared by the Aerospace and Defence Industries Association of
Europe - Standardization (ASD-STAN).
After enquiries 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 ASD,
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 2015, and conflicting national standards shall be withdrawn at the
latest by April 2015.
Attenti
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