SIST EN 4808:2017

Aerospace series - Flange couplings - Weld coupling, 90° elbow,in nickel alloy - Inch series

This standard specifies the characteristics of straight welded coupling in nickel alloy for swivel flange couplings for inch series aerospace applications.
Nominal pressure: The parts shall withstand nominal pressures given in Table 1. The nominal pressure of the assembly depends on associated seal, tube material characteristics, tube diameter and tube wall thickness (see EN 4814).
NOTE   Assembly in accordance with TR 4815.

Luft- und Raumfahrt - Rohrverschraubung mit Flanschen - Schweißstutzen, Winkelstutzen 90°, aus Nickellegierung - Inch-Reihe

Diese Europäische Norm legt die Eigenschaften von gerade geschweißten Stutzen aus Nickellegierung für Rohrverschraubungen mit losen Flanschen in Anwendungen der Luft- und Raumfahrt (Inch-Reihe) fest.
Nenndruck: Die Teile müssen den Nenndrücken in der Tabelle 1 widerstehen. Der Nenndruck des Aufbaus hängt von der Dichtung, den Eigenschaften des Rohrmaterials, dem Rohrdurchmesser und der Dicke der Rohrwand ab (siehe EN 4814).
ANMERKUNG   Aufbau nach TR 4815.

Série aérospatiale - Raccordement à bride - Raccord à souder, coude à 90°, en alliage de nickel - Série en inches

Aeronavtika - Prirobnične spojke - Varjena spojka, koleno 90°, iz nikljevih zlitin - Palčne mere

Ta standard določa lastnosti ravno varjenih spojk iz nikljevih zlitin za vrtljive prirobnične spojke za colsko izvedbo v aeronavtiki.
Nazivni tlak: deli morajo prenesti nazivne tlake, podane v preglednici 1. Nazivni tlak sestava je odvisen od povezanega tesnila, lastnosti materiala cevi, premera cevi in debeline stene cevi (glej standard EN 4814).
OPOMBA: Sestav v skladu s standardom TR 4815.

General Information

• Status: Published
• Publication Date: 12-Jun-2017
• ICS: 23.040.60 - Flanges, couplings and joints
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-May-2017
• Due Date: 31-Jul-2017
• Completion Date: 13-Jun-2017
• Ref Project: EN 4808:2017 - Aerospace series - Flange couplings - Weld coupling, 90° elbow, in nickel alloy - Inch series

Overview

EN 4808:2017 defines the characteristics and manufacturing requirements for welded 90° elbow flange couplings in nickel alloy for the inch series used in aerospace fluid systems. The standard applies to straight welded couplings for swivel flange couplings and specifies dimensional data, material and surface treatment options, identification marking and quality assurance expectations. Nominal pressures for parts are given in the standard’s Table 1 and the final assembly pressure depends on associated seals, tube material, tube diameter and wall thickness (see EN 4814). Assembly guidance is referenced in TR 4815.

Key topics and requirements

• Scope and configuration
  • Covers 90° weld couplings for inch-series aerospace flange couplings with defined dimensions, tolerances and masses (see Figure 1 / Table 1).
• Materials
  • Acceptable nickel-base materials include SAE AMS 5383 or alloys per EN 4380, EN 3671 or EN 4379.
• Surface treatment
  • Passivation to EN 2516 is required for surface finish and corrosion resistance.
• Pressure and performance
  • Nominal pressures are specified in Table 1; final assembly pressure capability depends on seal type, tube material, tube diameter and wall thickness (refer EN 4814).
• Identification and marking
  • Marking follows EN 2424 (category A) including identity block and manufacturer monogram.
• Technical specification & design
  • Technical details and assembly considerations are linked to EN 4814 (technical specification) and TR 4815 (design standard).
• Quality assurance
  • Manufacturer approval and quality systems should conform to EN 9100 requirements for aerospace organizations.

Applications and users

This standard is intended for organizations involved in aerospace fluid and hydraulic systems where reliable, pressure-rated flange couplings are required. Typical users include:

• Aerospace OEMs and tier‑1 suppliers designing or specifying fluid line components
• Manufacturers of nickel-alloy welded fittings and flange couplings
• Design and mechanical engineers responsible for aircraft hydraulic, fuel and pneumatic systems
• Procurement and quality teams verifying supplier compliance and marking
• Certification and inspection bodies auditing conformity to aerospace material and QA standards

EN 4808:2017 helps ensure interchangeability, traceability and consistent mechanical and corrosion performance for 90° welded flange couplings in critical aerospace applications.

Related standards

• EN 4814 - Flange couplings up to 21 000 kPa - Technical specification - Inch series
• TR 4815 - Flange couplings - Design standard - Inch series
• EN 2424 - Marking of aerospace products
• EN 2516 - Passivation of corrosion resistant steels / decontamination of nickel alloys
• EN 3671 / EN 4379 / EN 4380 - Nickel alloy material standards
• EN 9100 - Quality management for aerospace organizations
• SAE AMS 5383 - Nickel alloy investment castings

Keywords: EN 4808:2017, flange couplings, weld coupling, 90° elbow, nickel alloy, inch series, aerospace, nominal pressure, EN 4814, passivation, SAE AMS 5383, EN 9100.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2017
$HURQDYWLND3ULUREQLþQHVSRMNH9DUMHQDVSRMNDNROHQRƒL]QLNOMHYLK]OLWLQ
3DOþQHPHUH
Aerospace series - Flange couplings - Weld coupling, 90° elbow,in nickel alloy - Inch
series
Luft- und Raumfahrt - Rohrverschraubung mit Flanschen - Schweißstutzen,
Winkelstutzen 90°, aus Nickellegierung - Inch-Reihe
Série aérospatiale - Raccordement à bride - Raccord à souder, coude à 90°, en alliage
de nickel - Série en inches
Ta slovenski standard je istoveten z: EN 4808:2017
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
49.080 /HWDOVNLLQYHVROMVNL Aerospace fluid systems and
KLGUDYOLþQLVLVWHPLLQGHOL components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4808
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 49.080
English Version
Aerospace series - Flange couplings - Weld coupling, 90°
elbow, in nickel alloy - Inch series
Série aérospatiale - Raccordement à bride - Raccord à Luft- und Raumfahrt - Rohrverschraubung mit
souder, coude à 90°, en alliage de nickel - Série en Flanschen - Schweißstutzen, Winkelstutzen 90°, aus
inches Nickellegierung - Inch-Reihe
This European Standard was approved by CEN on 14 November 2016.

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, Serbia, 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
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4808:2017 E
worldwide for CEN national Members.

Contents
Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Required characteristics . 4
4 Designation . 7
5 Identification marking . 7
6 Technical specification . 7
7 Quality Assurance. 7

European foreword
This document (EN 4808:2017) 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 November 2017, and conflicting national standards shall be
withdrawn at the latest by November 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN shall not be held responsible for identifying any or all such paten
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