SIST EN 4813:2017

Aerospace series - Flange couplings - Cap, in heat resisting steel - Inch series

This standard specifies the characteristics of cap, in heat resisting steel 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 - Verschlusskappe aus hochwarmfestem Stahl - Inch-Reihe

Diese Europäische Norm legt die Eigenschaften von Verschlusskappen aus hochwarmfestem Stahl 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 - Obturateur, en acier résistant à chaud - Série en inches

Aeronavtika - Prirobnične spojke - Pokrov iz toplotno odpornega jekla - Colska izvedba

Ta standard določa lastnosti pokrova iz toplotno odpornega jekla 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: 06-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: 02-Jun-2017
• Due Date: 07-Aug-2017
• Completion Date: 07-Jun-2017
• Ref Project: EN 4813:2017 - Aerospace series - Flange couplings - Cap, in heat resisting steel - Inch series

Overview

SIST EN 4813:2017 is a European standard established by CEN that specifies the characteristics of caps made from heat-resisting steel, designed for swivel flange couplings used in inch series aerospace applications. This standard is critical in ensuring the reliability and safety of aerospace fluid systems where flange coupling caps must withstand high nominal pressures while maintaining robust material qualities and precise dimensions.

The standard promotes consistency across aerospace manufacturing, supporting interoperability and quality assurance in critical aerospace components.

Key Topics

• Material Specifications
  Caps must be manufactured from heat-resisting steels conforming to EN 3468 or EN 3487. These materials ensure durability and resistance to thermal stress in demanding aerospace environments.

• Pressure Resistance
  The caps are designed to withstand nominal pressures as detailed in Table 1 of SIST EN 4813:2017. The overall pressure rating for the assembly also depends on the associated seal, tube material characteristics, diameter, and wall thickness, which are further defined in EN 4814.

• Dimensional Accuracy
  Strict dimensional tolerances and configurations are provided, including nominal diameter coded by the inch series, ensuring compatibility with aerospace flange coupling systems. Dimensions and tolerances are measured in millimeters, guaranteeing precision.

• Surface Treatment
  All caps require passivation according to EN 2516 to enhance corrosion resistance, important for long-term use in aerospace applications.

• Identification and Marking
  Markings follow EN 2424 category A, allowing for clear traceability and standard identification of parts as specified in the standard.

• Quality Assurance
  Manufacturers must be approved under the EN 9100 quality management system standard, ensuring production meets aerospace industry requirements.

Applications

SIST EN 4813:2017 flange coupling caps are primarily used in aerospace fluid systems where heat resistance and mechanical reliability are paramount. Applications include:

• Aircraft hydraulic and fuel systems requiring secure, pressure-resistant seals.
• Aerospace swivel flange couplings facilitating component connections in inch series dimensions.
• High-temperature aerospace environments where materials must resist degradation.
• Fluid transport lines in space and defense systems where precise fitting and quality assurance are critical.
• Replacement or upgrade parts in aerospace maintenance and manufacturing.

By complying with SIST EN 4813:2017, aerospace manufacturers and maintenance providers can ensure their flange coupling caps are fit for purpose, minimizing operational risks related to pressure failures or material degradation.

Related Standards

To fully implement and apply SIST EN 4813:2017, consider referencing these related standards:

• EN 4814 – Aerospace series flange couplings’ technical specifications, essential for assembly verification considering seals and tube specifications.
• TR 4815 – Design standard for flange couplings up to 21,000 kPa, providing guidelines to ensure the mechanical integrity of assemblies.
• EN 2424 – Marking of aerospace products, specifying identification requirements for traceability.
• EN 2516 – Passivation and decontamination treatments for corrosion-resistant aerospace materials.
• EN 3468 & EN 3487 – Specifications for heat-resisting steel materials used in manufacturing these caps.
• EN 9100 – Quality management system requirements tailored for aviation, space, and defense organizations ensuring manufacturing excellence.

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By adhering to SIST EN 4813:2017 and its complementary standards, aerospace companies assure that flange coupling caps meet exacting safety, performance, and interoperability demands, supporting the integrity of critical aerospace fluid systems worldwide.

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2017
$HURQDYWLND3ULUREQLþQHVSRMNH3RNURYL]WRSORWQRRGSRUQHJDMHNOD&ROVND
L]YHGED
Aerospace series - Flange couplings - Cap, in heat resisting steel - Inch series
Luft- und Raumfahrt - Rohrverschraubung mit Flanschen - Verschlusskappe aus
hochwarmfestem Stahl - Inch-Reihe
Série aérospatiale - Raccordement à bride - Obturateur, en acier résistant à chaud -
Série en inches
Ta slovenski standard je istoveten z: EN 4813:2017
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 4813
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2017
EUROPÄISCHE NORM
ICS 49.080
English Version
Aerospace series - Flange couplings - Cap, in heat resisting
steel - Inch series
Série aérospatiale - Raccordement à bride - Obturateur, Luft- und Raumfahrt - Rohrverschraubung mit
en acier résistant à chaud - Série en inches Flanschen - Verschlusskappe aus hochwarmfestem
Stahl - 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 4813:2017 E
worldwide for CEN national Members.

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

European foreword
This document (EN 4813:2017) 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 rule
...