1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 4814 Edition P 1 December 2015 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Rue Montoyer 10 - 1000 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 775 8131 - www.asd-stan.orgICS: Descriptors: ENGL
2、ISH VERSION 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 Srie arospatiale Raccordement bride Jusqu 21 000 kPa Spcification technique Srie en inches This
3、“Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Dom
4、ain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agree
5、ment of ASD-STAN, the ASD-STAN prEN will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the s
6、tatus of a national standard and by withdrawing any national standards conflicting with the EN. ASD-STAN Technical Committee approves that: “This document is published by ASD-STAN for the needs of the European Aerospace Industry. The use of this standard is entirely voluntary, and its applicability
7、and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” ASD-STAN reviews each standard and technical report at least every five years at which time it may be revised, reaffirmed, stabilized or cancelled. ASD-STAN invites y
8、ou to send your written comments or any suggestions that may arise. All rights reserved. No parts of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written perm
9、ission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1stDecember 2015 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain Copyright 2016 ASD-STAN prEN 4814:2015 (E) 2 Conte
10、nts Page Foreword .2 1 Scope .3 2 Normative references .3 3 Terms and definitions 4 4 Requirements, inspection and test methods .6 5 Quality assurance 13 6 Preparation for delivery 14 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domain. After inquir
11、ies and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 4814:2015 (E) 3 1 Scope This standard specifies the required characteristics, inspection and test methods, quality assurance and p
12、rocurement 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
13、 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.
14、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 non-metallic inclusions 1) EN 9133, Aerospace series Quality management systems Qualification pr
15、ocedure for aerospace standard parts EN 10204, Metallic products Types of inspection documents ISO 468:1982, Surface roughness Parameters, their values and general rules for specifying requirements ISO 2685, Aircraft Environmental test procedure for airborne equipment Resistance to fire in designate
16、d 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 t
17、esting 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 Rigid lines, installation 2) TR 481
18、5, Aerospace series Flange couplings, up to 21 000 kPa Design standard Inch series 2) MIL-PRF-23699, Lubricating oil, aircraft turbine engine, synthetic base, NATO code number O-156 3) 1) Published as ASD-STAN Prestandard at the date of publication of this standard. (http:/www.asd-stan.org/) 2) Publ
19、ished 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/) prEN 4814:2015 (E) 4 3 Terms and definitions For the purposes of this document, the following terms an
20、d 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
21、 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 prEN 4814:2015 (E) 5 3.2.2 dimensional code is composed w
22、ith the nominal diameter given in 16th 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
23、.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: Wher
24、e 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
25、, 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
26、as caused, for example, by corrosion 3.4 Quality assurance 3.4.1 production batch a 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 diffe
27、rent production batches 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 prEN 4814:2015 (E) 6 3.4.4 qualification testing required to demonstrate successful
28、performance of the coupling assembly in simulated service (overload, destructive and fatigue tests) 3.4.5 major defect a 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 a def
29、ect 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 and Tabl
30、e 2. 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 tes
31、t 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 ou
32、t 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 detri
33、mental 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
34、 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 between
35、 the nut and the ferrule. Either bolt or mating threaded part shall have coated on thread. A torque value comprised between the minimum and the maximum given in Table 4 shall be apply to each bolt without any special sequence in the torque tightening. 4.1.4 Pressurizing. Nominal pressure (PN); Proof
36、 pressure (PE) and Burst pressure (PR) are given in Tables 5a, 5b, 6a and 6b for usual tube material and thickness. prEN 4814:2015 (E) 7 For other tube material and thickness the Burst pressure (PR) shall be determined with the fomula: D eRPR 2m= PEPNPR = = 24 where Rm Material minimal strength resi
37、stance 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 refering to this qualification shall g
38、ive the pressure class achieved during qualification tests. Table 1 Requirements, inspection and test methods (1 of 3) Clause Characteristic Requirement Inspection and test method Q a A a 4.2 b Materials Metallic materials shall meet the acceptance criteria given in EN 2951. Conformity with the prod
39、uct standards. Metallic materials shall be tested in accordance with EN 2951. Certificate of compliance to EN 10204 issued by the semi-finished product manufacturer. X 100 % X 100 % 4.3 b Dimensions Conformity with the product standards Suitable measuring instruments X 100 % X 20 % 4.4 b Product ide
40、ntification Marking according to product standards. It shall be legible and shall not adversely affect the material or the functioning of the products. Visual examination X 100 % X 100 % 4.5 b Surface roughness Conformity with the product standards Interpreted in accordance with ISO 468 Suitable mea
41、suring instruments or visual-tactile samples X 100 % X 20 % 4.6 b Surface coating or treatment Conformity with the product standards Visual examination X 100 % X 50 % 4.7 b Surface defects Parts shall be free from surface defects indicated in 3.3 liable to have an adverse affect on their characteris
42、tics and endurance. Visual inspection using suitable methods X 100 % X 100 % 4.8 Proof pressure test The coupling assembly shall withstand and shall not show any evidence of permanent deformation or other malfunction that would affect assembly or disassembly without any relative pressure when using
43、the specified torque values. The coupling assembly shall be connected to a pressure source at a pressure equal to twice the nominal pressure (as given in Tables 5a, 5b, 6a and 6b) for at least 5 min at ambient temperature with one end free to move. X prEN 4814:2015 (E) 8 Table 1 Requirements, inspec
44、tion and test methods (2 of 3) Clause Characteristic Requirement Inspection and test method Q a A a 4.9 Gaseous pressure test There shall be no visible formation of bubble. The coupling assembly shall be solvent cleaned and air dried prior to testing. It shall be assembled and tightened to the torqu
45、e value specified in Table 4. It shall be immersed in water bath at ambient temperature. It shall then be pressurised with air or nitrogen to 500 kPa 50 kPa with 0,5 % to 1 % of wetting agent (make up by volume) for at least 5 min, at ambient temperature. X 4.10 Burst pressure test The coupling asse
46、mbly shall withstand this test without leakage. Pipe expansion is permissible. The coupling assemblies need not meet any disassembly or assemblies requirements after this test. The coupling assembly shall be connected to a pressure source at a pressure equal to four times the nominal pressure (as gi
47、ven in Tables 4 and 5) for at least 5 min, when tested at ambient temperature with one end free to move. X 4.11 Re-use capability test The coupling assembly shall withstand 25 repeated assemblies, without any of the following defects: Leakage at any of the proof or gaseous pressure tests; mating sur
48、face deformation. The coupling assembly shall be tested with the bolts of one side torqued to the minimum value of the tightening torque. The coupling assembly shall then be disassembled by unscrewing the bolt on three (3) turns. Repeat the above operations for a total of 25 times with alternance of
49、 maximum tightening torque value and minimum tightening torque value. After each fifth time, the coupling shall be subjected to the gaseous pressure test according to 4.9 and proof pressure test according to 4.8. In case of leakage gasket seal may be change with a new part. This shall be recorded in the test report. X 4.12 Impulse resistance test The coupling assembly shall withstand 200 000 impulse pressure cycles without leakage. The temperature type and pressure class per ISO 6771 used for this test shall be
