1、 ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM ASD-STAN prEN 3275:2018 Edition P2 March 2018 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.org ICS: Descriptors: E
2、NGLISH VERSION Aerospace series Pipe coupling 830 up to 28 000 kPa Dynamic beam seal Metric series Technical specification Luft- und Raumfahrt Rohrverschraubung 830 bis 28 000 kPa Dichtlippe Metrische Reihe Technische Lieferbedingungen Srie arospatiale Systme de raccordement 830 jusqu 28 000 kPa Joi
3、nt lvre Srie mtrique Spcification technique This “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 technic
4、ally approved by the experts of the concerned Domain 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
5、 examination and review by users and formal agreement 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 implemen
6、t the EN at national level by giving the EN the status 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 stand
7、ard is entirely voluntary, and its applicability 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, reaffi
8、rmed, stabilized or cancelled. ASD-STAN invites you 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, re
9、cording, or otherwise, without prior written permission of ASD-STAN. Order details: E-mail: salesasd-stan.org Web address: http:/www.asd-stan.org/ Edition approved for publication 1st March 2018 Comments should be sent within six months after the date of publication to ASD-STAN Mechanical Domain prE
10、N 3275:2018 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 5 4 Symbols . 7 5 Requirements, inspection and test methods . 7 5.1 Test conditions and preparation of specimens for qualification . 7 6 Quality assurance . 23 6.1 Product qualification 23 6.2 Qua
11、lity control records 23 6.3 Acceptance conditions 23 6.4 Rejection 23 6.5 Purchasers (users) quality control 24 7 Preparation for delivery 24 7.1 Cleaning . 24 7.2 Preservation and packaging . 24 (normative) Production batch identification 28 Annex AA.1 Introduction . 28 A.2 Records 28 A.3 Example o
12、f batch identification 29 Bibliography . 30 prEN 3275:2018 (E) 3 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Mechanical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this st
13、andard has received approval for Publication. prEN 3275:2018 (E) 4 1 Scope This standard specifies the required characteristics, inspection and test methods, quality assurance and procurement requirements for metric series 830 dynamic beam seal pipe couplings, for temperature ranges type II and III
14、according to ISO 6771 and nominal pressure up to 28 000 kPa. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated referen
15、ces, the latest edition of the referenced document (including any amendments) applies. EN 2813, Aerospace series Aluminium alloy AL-P6061-T6 Drawn tube for pressure applications 0,6 mm a 12,5 mm1)EN 3120, Aerospace series Titanium alloy TI-P64003 Cold worked and stress relieved Seamless tube for pre
16、ssure systems 4 mm D 51 mm, 690 MPa Rm 1 030 MPa EN 10204, Metallic products Types of inspection documents EN ISO 1302, Geometrical Product Specifications (GPS) Indication of surface texture in technical product documentation ISO 2685, Aircraft Environmental test procedure for airborne equipment Res
17、istance 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 5855 (all parts), Aerospace MJ threads ISO 6771, Aerospace Fluid systems and components Pressure and
18、temperature classifications ISO 6772, Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assemblies ISO 7137, Aircraft Environmental conditions and test procedures for airborne equipment ISO 7257, Aircraft Hydraulic tubing joints and fittings Rotary flexure test ISO 8625-1
19、, Aerospace fluid systems vocabulary Part 1: general terms and definitions relating to pressure ISO 9538, Aerospace Hydraulic tubing joints and fittings Planar flexure test TR 2674, Design and construction of pipeline for fluids in liquid or gaseous condition Rigid lines, installation2)MIL-H-5606, H
20、ydraulic fluid, Petroleum Base, Aircraft, Missile and Ordnance3)MIL-H-8446, Hydraulic fluid, Nonpetroleum Base, Aircraft3)1) Published as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). 2) Published as ASD-STAN Technical Report at the date of publication of this
21、standard (www.asd-stan.org). 3) Published by: Department of Defense (DoD), the Pentagon, Washington, D.C. 20301. prEN 3275:2018 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standar
22、dization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.1 pressure nominal pressure, proof pressure, impulse pressure, burst pressure according to ISO 8625-1 3.2 coupling 3.2.1 coupling assembl
23、y assembled and torque-tightened nut, ferrule and pipe mating with e.g. unions, tees or elbows Note 1 to entry: See Figure 1. Key 1 Dynamic beam seal 2 Ferrule 3 Nut 4 Union end Figure 1 Example of coupling assembly 3.2.2 straight coupling union connecting pipe to pipe 3.2.3 forged parts shaped part
24、s couplings machined out of individual forging blanks Note 1 to entry: For crosses, tees and elbows machined out of bar or plate stock the term “shaped” may be used. prEN 3275:2018 (E) 6 3.3 surface defects 3.3.1 surface irregularity nonconformity with general surface appearance, possible defect 3.3
25、.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. Where parts are subje
26、ct 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 h
27、eads. 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 exa
28、mple, 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 batc
29、hes prEN 3275:2018 (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 to demonstrate successful performance of the c
30、oupling 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 t
31、o 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 Symbols A Elongation, in percent % D0Actual outside diameter of pipe, in millimetres m
32、m D1Actual inside diameter of pipe, in millimetres mm DN Nominal outside diameter of pipe P Working pressure, in megapascals MPa RmTensile strength, in megapascals MPa Rp0,20,2 % proof stress, in megapascals MPa xAxial stress due to pressure, in megapascals MPa 5 Requirements, inspection and test me
33、thods See Table 1 and Table 2. 5.1 Test conditions and preparation of specimens for qualification Tests fluids Unless otherwise specified, tests shall be carried out using e.g. a petroleum base hydraulic fluid to MIL H 5606 for coupling assemblies of type II temperature range and a silicate ester ba
34、se hydraulic fluid to MIL H 8446 for those of type III temperature range. Water may be used, whenever practical, for proof, burst, stress corrosion and re-use capability testing. For other than hydraulic system prEN 3275:2018 (E) 8 applications, it is preferable to use system fluid for leakage (gase
35、ous pressure) and proof testing. When specified in the test method, the test fluid is used as a lubricant. Specimen preparation Shaped parts shall be machined with the grain flow of the bar or plate in the direction of the fluid. Specimens shall be assembled as illustrated in Table 2. Installations
36、on the pipe end shall be in accordance with TR 2674. Prior to testing, all couplings shall be assembled using the maximum specified torque. Except, when specified in Table 2, the coupling shall be assembled using the minimum installation torque for at least half of the specimens, and maximum torques
37、 for the remainder. Pipe assembly The method of joining the pipe to the coupling end (brazing, welding, mechanical attachment, etc.) shall not be detrimental to the properties, strength or geometry of the pipe and the coupling end. The joint shall be in accordance with the design instructions and sh
38、all be inspected by direct measurement, X-ray or other non-destructive methods. Table 1 Requirements, inspection and test methods Clause Characteristic Requirement Inspection and test method QaAa5.2bMaterials Conformity with the product standards Chemical analysis or certificate of compliance to EN
39、10204 issued by the semi-finished product manufacturer. X 100 % X 100 % 5.3bDimensions Conformity with the product standards Suitable measuring instruments X 100 % X 50 % Fluid passages Conformity with the product standards A ball with a diameter 0,5 mm less than the minimum diameter specified for t
40、he passage shall pass through the coupling. X 100 % X 20 % 5.4bProduct identification Marking according to product standards and definition documents including batch identification of Annex A. It shall be legible and shall not adversely affect the material or the functioning of the products. Visual
41、examination X 100 % X 100 % 5.5bSurface roughness Conformity with the product standards Interpreted in accordance with ISO 1302 Suitable measuring instruments or visual-tactile samples X 100 % X 100 % 5.6bSurface treatment Conformity with the product standards Visual examination The thread shall be
42、tested using a gauge with a tolerance class of 4h6h. X 100 % X 100 % prEN 3275:2018 (E) 9 Clause Characteristic Requirement Inspection and test method QaAa5.7bSurface defects Parts shall be free from surface defects indicated in 3.3 liable to have an adverse affect on their characteristics and endur
43、ance. Visual inspection using suitable methods X 100 % X 100 % Visual examination X 100 % X 100 % Threads Threads may be cut, rolled or ground, except titanium alloys which shall be cut or rolled. The external threads of couplings should be rolled and, if machined, shall have an arithmetical mean de
44、viation, Ra, of the profile of 3,2 m or smoother in accordance with ISO 1302. The grain flow in rolled threads shall be continuous and follow the general thread contour with the maximum density at the thread root. Laps, cracks, surface irregularities and seams (see 3.3) are not acceptable on any par
45、t of the pressure thread flank, in the thread root or on the non-pressure thread flank. Laps and seams, depths of which are within the limits of table, are acceptable on the crest and the non-pressure thread flank above the pitch diameter. Thread flanks in rolled threads shall be examined by micro-e
46、xamination. Specimens shall be taken from the finished part by sectioning on a longitudinal plane across the threaded area. The specimens shall be polished and etched to reveal the surface defects. X 10 % X 5 % DN Depth mm 05 06 08 10 12 14 to 32 0,15 0,18 0,18 0,20 0,23 0,25 prEN 3275:2018 (E) 10 C
47、lause Characteristic Requirement Inspection and test method QaAa5.8 Proof pressure The coupling assembly shall withstand a pressure equal to twice the nominal pressure of the fluid system for 5 min at ambient temperature without leakage and shall not show any evidence of permanent deformation or oth
48、er malfunction when using the specified torque values. The coupling assembly shall be connected to a pressure source with one end free to move. Rate of pressure increase shall be (150 000 37 500) kPa/min. X 5.9 Gaseous pressure The coupling assembly shall withstand a gaseous pressure equal to the no
49、minal pressure for 5 min, at ambient temperature. There shall be no visible formation of bubbles after 1 min at pressure or other malfunction that would affect assembly or disassembly when using the torque values specified. The coupling assembly shall be solvent cleaned and air dried prior to testing. It shall be assembled and tightened to the minimum torques specified in Table 3. It shall then be pressurized with nitrogen to the nominal pressure. This pressure
