SIST EN 4814:2017

SLOVENSKI STANDARD
SIST EN 4814:2017
01-julij-2017
$HURQDYWLND3ULUREQLþQHVSRMNHGRN3D7HKQLþQDVSHFLILNDFLMD&ROVND
L]YHGED
Aerospace series - Flange couplings up to 21 000 kPa - Technical specification - Inch
series
Luft- und Raumfahrt - Rohrverschraubung mit Flanschen bis 21 000 kPa - Technische
Lieferbedingung - Inch-Reihe
Série aérospatiale - Raccordement à bride Jusqu'à 21 000 kPa - Spécification technique
- Série en inches
Ta slovenski standard je istoveten z: EN 4814:2017
ICS:
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
49.080 /HWDOVNLLQYHVROMVNL Aerospace fluid systems and
KLGUDYOLþQLVLVWHPLLQGHOL components
SIST EN 4814:2017 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 4814:2017

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SIST EN 4814:2017


EN 4814
EUROPEAN STANDARD

NORME EUROPÉENNE

May 2017
EUROPÄISCHE NORM
ICS 49.080
English Version

Aerospace series - Flange couplings up to 21 000 kPa -
Technical specification - Inch series
Série aérospatiale - Raccordement à bride Jusqu'à 21 Luft- und Raumfahrt - Rohrverschraubung mit
000 kPa - Spécification technique - Série en inches Flanschen bis 21 000 kPa - Technische
Lieferbedingung - Inch-Reihe
This European Standard was approved by CEN on 7 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 4814:2017 E
worldwide for CEN national Members.

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SIST EN 4814:2017
EN 4814:2017 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions. 5
3.1 Pressure . 5
3.2 Coupling and assembling . 5
3.3 Surface defects . 6
3.4 Quality assurance . 6
4 Requirements, inspection and test methods . 7
4.1 Test conditions and preparation of specimens for qualification . 7
5 Quality assurance . 12
5.1 Product qualification . 12
5.2 Quality control records . 13
5.3 Acceptance conditions . 13
5.4 Rejection . 13
5.5 Purchaser's (user's) quality control . 13
6 Preparation for delivery . 14
6.1 Cleaning. 14
6.2 Preservation and packaging . 14

2

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SIST EN 4814:2017
EN 4814:2017 (E)
European foreword
This document (EN 4814:2017) 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 patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: 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 the United Kingdom.
3

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SIST EN 4814:2017
EN 4814:2017 (E)
1 Scope
This standard specifies the required characteristics, inspection and test methods, quality assurance and
procurement requirements for inch series, pipe couplings, swivel flanges, for temperature ranges from type
II to type V according to ISO 6771 and nominal pressure up to 21 000 kPa (class D according to ISO 6771).
In addition to the requirements of this technical specification, the coupling assemblies shall be qualified in
accordance with equipment or component specification requirements.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 2951, Aerospace series — Metallic materials — Test method — Micrographic determination of content of
1)
non-metallic inclusions
EN 9133, Aerospace series — Quality management systems — Qualification procedure for aerospace standard
parts
EN 10204, Metallic products — Types of inspection documents
ISO 468, Surface roughness — Parameters, their values and general rules for specifying requirements
ISO 2685, Aircraft — Environmental test procedure for airborne equipment — Resistance to fire in designated
fire zones
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 6771, Aerospace — Fluid systems and components — Pressure and temperature classifications
ISO 6772, Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies
ISO 8625-1, Aerospace — Fluid systems — Vocabulary — Part 1: General terms and definitions related to
pressure
TR 2674, Aerospace series — Design and construction of pipeline for fluids in liquid or gaseous condition —
2)
Rigid lines, installation
2)
TR 4815, Aerospace series — Flange couplings up to 21 000 kPa — Design standard — Inch series
MIL-PRF-23699, Lubricating oil, aircraft turbine engine, synthetic base, NATO code numbers: O-152, O-154,
3)
O-156, and O-167

1)
Published as ASD-STAN Prestandard at the date of publication of this standard. (http://www.asd-stan.org/)
2)
Published as ASD-STAN Technical Report at the date of publication of this standard. (http://www.asd-stan.org/)
3)
Published by: DoD National (US) Mil. Department of Defense. (http://www.defenselink.mil/)
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SIST EN 4814:2017
EN 4814:2017 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Pressure
Nominal pressure, proof pressure, impulse pressure, burst pressure according to ISO 8625-1.
Maximum operating pressure depends on the seal use in the assembly.
3.2 Coupling and assembling
3.2.1
coupling assembly
assembled ferrule, loose flange, bolts and pipe mating with e.g. equipment (see Figure 1)

Key
1 Bolts
2 Swivel flange
3 Tube
4 Coupling
5 Seal
6 Port connection on case or equipment with optional inserts. May be replaced by another flange coupling
with nuts.
Figure 1 — Example of coupling assembly
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SIST EN 4814:2017
EN 4814:2017 (E)
3.2.2
dimensional code
th
is composed with the nominal diameter given in 16 of inches within two (2) digit and additional digit when
necessary to describe the size of a fluid system component and other configuration options
3.3 Surface defects
3.3.1
surface irregularity
nonconformity with general surface appearance, possible defect
3.3.2
crack
clean (crystalline) fracture passing through or across the grain boundaries that possibly follows inclusions of
foreign elements
Note 1 to entry: Cracks are normally caused by overstressing the metal during forging or other forming operations,
or during heat treatment.
Note 2 to entry: Where parts are subject to significant reheating, cracks are usually discoloured by scale.
3.3.3
fold
doubling over of metal, which can occur during the forging operation
Note 1 to entry: Folds can occur at or near the intersection of diameter changes and are especially prevalent with
non-circular necks, shoulders and heads.
3.3.4
lap
fold-like machining defect
3.3.5
seam
(1) usually a surface opening or crack resulting from a defect obtained during casting or forging
(2) extraneous material, stringer in the material, which is not homogeneous with base metal
3.3.6
pit
void or hole in the surface as caused, for example, by corrosion
3.4 Quality assurance
3.4.1
production batch
definite quantity of some commodity or service produced at one time under conditions that are presumed
uniform
3.4.2
delivery batch
batch consisting of couplings with the same identity block which may come from different production
batches
6

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SIST EN 4814:2017
EN 4814:2017 (E)
3.4.3
acceptable quality level
AQL
when a continuing series of lots is considered, a quality level which for the purposes of sampling inspection
is the limit of a satisfactory process average
3.4.4
qualification
testing required to demonstrate successful performance of the coupling assembly in simulated service
(overload, destructive and fatigue tests)
3.4.5
major defect
defect other than critical, that is likely to result in a failure or to reduce materially the usability of the
considered product for its intended purpose
3.4.6
minor defect
defect that is not likely to reduce materially the usability of the considered product for its intended purpose,
or that is a departure from established specification having little bearing on the effective use or operation of
this product
4 Requirements, inspection and test methods
See Table 1.
Qualification tests given from 4.12 to 4.14 shall only be made when required. Complementary qualification
tests may be determined in direct relation with the application (e. g. vibration test, thermal shock test).
The couplings shown on Figure 1 of this standard are for information only. The test specimens shall be
assembled with the part to test (e. g. elbow fitting instead of straight fitting) and its associated components
in accordance with TR 4815.
4.1 Test conditions and preparation of specimens for qualification
4.1.1 Tests fluids
Unless otherwise specified, tests shall be carried out using e.g. oil compatible with the test temperature
range. Water may be used, whenever practical, for proof, burst, stress corrosion and re-use capability testing.
4.1.2 Pipe junction
The method of joining the pipe to the coupling (brazing, welding, mechanical attachment, etc.) shall not be
detrimental to the properties, strength or geometry of the pipe assembly. The joint shall be in accordance
with the design instructions and shall be inspected by direct measurement, X-ray or other non-destructive
methods.
4.1.3 Assembling
Installations of the coupling shall be in accordance with TR 2674 and TR 4815.
The coupling shall be fitted with nickel alloy double hexagonal head bolt with the relevant bolt size.
Unless otherwise specified, the bolt shall be lubricated if necessary prior the assembling with engine oil
(e. g. according to MIL-PRF-23699) on the thread and at the interface betw
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