1、Aerospace series Flange couplings up to 21 000 kPa Technical specification Inch series BS EN 4814:2017 BSI Standards Publication WB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4814 May 2017 ICS 49.080 English Version Aerospace series - F
2、lange couplings up to 21 000 kPa - Technical specification - Inch series Srie arospatiale - Raccordement bride Jusqu 21 000 kPa - Spcification technique - Srie en inches Luft- und Raumfahrt - Rohrverschraubung mit Flanschen bis 21 000 kPa - Technische Lieferbedingung - Inch-Reihe This European Stand
3、ard 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
4、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
5、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
6、, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMIT
7、EE FR 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 worldwide for CEN national Members. Ref. No. EN 4814:2017 E National foreword This British Standard is the UK implementation of EN 4814:2017. The U
8、K participation in its preparation was entrusted to Technical Committee ACE/12, Aerospace fasteners and fastening systems. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a
9、 contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 0 580 95577 8 ICS 49.080 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under t
10、he authority of the Standards Policy and Strategy Committee on 30 June 2017. Amendments/corrigenda issued since publicationDate Text affected BRITISH STANDARD BS EN 4814:2017 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4814 May 2017 ICS 49.080 English Version Aerospace series - Flange coupl
11、ings up to 21 000 kPa - Technical specification - Inch series Srie arospatiale - Raccordement bride Jusqu 21 000 kPa - Spcification technique - Srie en inches Luft- und Raumfahrt - Rohrverschraubung mit Flanschen bis 21 000 kPa - Technische Lieferbedingung - Inch-Reihe This European Standard was app
12、roved 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 nation
13、al 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 languag
14、e 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, H
15、ungary, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMU
16、NG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 4814:2017 E BS EN 4814:2017EN 4814:2017 (E) 2 Contents Page European foreword . 3 1 Scope . 4 2 Normative refe
17、rences . 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
18、 . 12 5.2 Quality control records . 13 5.3 Acceptance conditions . 13 5.4 Rejection . 13 5.5 Purchasers (users) quality control . 13 6 Preparation for delivery . 14 6.1 Cleaning. 14 6.2 Preservation and packaging 14 BS EN 4814:2017EN 4814:2017 (E) 3 European foreword This document (EN 4814:2017) has
19、 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 mem
20、ber 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 Novemb
21、er 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 t
22、he 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, Nether
23、lands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 4814:2017EN 4814:2017 (E) 4 1 Scope This standard specifies the required characteristics, inspection and test methods, quality assurance and procurement requirements
24、 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
25、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,
26、 the latest edition of the referenced document (including any amendments) applies. EN 2951, Aerospace series Metallic materials Test method Micrographic determination of content of non-metallic inclusions 1)EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace st
27、andard 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, Samp
28、ling 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, tub
29、ing 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 Rigid lines, installation 2)TR 4815, Aerospace series Flange cou
30、plings up to 21 000 kPa Design standard Inch series 2)MIL-PRF-23699, Lubricating oil, aircraft turbine engine, synthetic base, NATO code numbers: O-152, O-154, O-156, and O-167 3)1)Published as ASD-STAN Prestandard at the date of publication of this standard. (http:/www.asd-stan.org/) 2)Published as
31、 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/) BS EN 4814:2017EN 4814:2017 (E) 5 3 Terms and definitions For the purposes of this document, the following term
32、s 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 ma
33、ting 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 BS EN 4814:2017EN 4814:2017 (E) 6 3.2.2 dimensional c
34、ode is composed with the nominal diameter given in 16 thof 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, po
35、ssible 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
36、 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 n
37、on-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
38、 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 c
39、ome from different production batches BS EN 4814:2017EN 4814:2017 (E) 7 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
40、 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
41、 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 metho
42、ds 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 o
43、nly. 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 b
44、e 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 n
45、ot 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 wi
46、th 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 interf
47、ace between the nut and the ferrule. Either bolt or mating threaded part shall have coated on thread. BS EN 4814:2017EN 4814:2017 (E) 8 A torque value comprised between the minimum and the maximum given in Table 3 shall be apply to each bolt without any special sequence in the torque tightening. 4.1
48、.4 Pressurizing Nominal pressure (PN); Proof pressure (PE) and Burst pressure (PR) are given in Tables 4a, 4b, 5a and 5b for usual tube material and thickness. For other tube material and thickness the Burst pressure (PR) shall be determined with the formula: = m 2 = 4 = 2 where R m Material minimal
49、 strength resistance of the tube; e Thickness of the tube; D Nominal diameter of the tube. For parts able to be used on several tube material and thickness. To qualify a part it is mandatory to use the maximum pressure class it can withstand. The test report and any document referring to this qualification shall give the pressure class achieved during qualification tests. Table 1 Requirements, inspection an
