1、ASD-STAN STANDARD NORME ASD-STAN ASD-STAN NORM prEN 4560 Edition P 2 October 2013 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: 49.080 Supersedes edition P 1
2、of September 2000 and will supersede EN 4560:2003 Descriptors: ENGLISH VERSION Aerospace series Pipe coupling 37, spherical up to 21 000 kPa Inch series Technical specification Srie arospatiale Systme de raccordement sphrique 37, jusqu 21 000 kPa Srie inch Spcification technique Luft- und Raumfahrt
3、Rohrverschraubung mit Kugelbuchsen 37, bis 21 000 kPa Inch-Reihe Technische Lieferbedingungen 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 th
4、e European Aerospace Industry. It has been technically 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
5、, without re-identification of the standard. After examination and review by users and formal agreement of ASD-STAN, it 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 nat
6、ional members have then to implement 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. Edition approved for publication 1 October 2013 Comments should be sent within six months after the date of publication
7、to ASD-STAN Mechanical Domain Copyright 2013 by ASD-STAN prEN 4560:2013 (E) 2 Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Terms and definitions .4 3.1 Pressure 4 3.2 Coupling and assembling .4 3.3 Surface defects 5 3.4 Quality assurance 5 4 Requirements, inspection and test methods
8、 6 4.1 Test conditions and preparation of specimens for qualification 6 5 Quality assurance 12 5.1 Product qualification .12 5.2 Quality control records .12 5.3 Acceptance conditions .12 5.4 Rejection .13 5.5 Purchasers (users) quality control .13 6 Preparation for delivery 14 6.1 Cleaning 14 6.2 Pr
9、eservation and packaging .15 Annex A (informative) Standard evolution form 16 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 Ma
10、nual, this standard has received approval for Publication. prEN 4560:2013 (E) 3 1 Scope This standard specifies the required characteristics, inspection and test methods, quality assurance and procurement requirements for inch series, pipe coupling, 37, spherical, for temperature ranges from type II
11、 to type V according to ISO 6771 and nominal pressure up to 21 000 kPa. 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
12、 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
13、 materials Test method Micrographic determination of content of non-metallic inclusions 1)EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts EN 10204, Metallic products Types of inspection documents EN ISO 1302, Geometrical product specification
14、 (GPS) Indication of surface texture in technical product documentation (ISO 1302:2002) 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
15、acceptance quality limit (AQL) for lot-by-Iot inspection (ISO 2859-1:1999) 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 7137, Aircraft Environmental con
16、ditions and test procedures for airborne equipment ISO 8625-1, Aerospace Fluid systems Vocabulary Part 1: General terms and definitions related to pressure TR 2674, Aerospace series Design and construction of pipelines for fluids in liquid or gaseous condition Rigid lines, installation 2)MIL-L-23699
17、, 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) Published as ASD-STAN Technical Report at the date of publication of this standard. http:/www.asd-stan.org
18、/ 3) Published by : Department of Defense (DoD), the Pentagon, Washington, D.C. 20301, USA http:/www.defenselink.mil/. prEN 4560:2013 (E) 4 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Pressure nominal pressure, proof pressure, impulse pre
19、ssure, burst pressure according to Table 1 below. Table 1 Dimensional code Nominal diameter Wall thickness 0,71 mm Wall thickness 0,89 mm Nominal pressure Proof pressure Impulse pressure Burst pressure Nominal pressure Proof pressure Impulse pressure Burst pressure mm bars bars bars bars bars bars b
20、ars bars 03 4,76 210 420 210 840 210 420 210 840 04 6,35 05 7,92 360 720 06 9,52 160 270 540 360 720 08 12,7 105 210 105 420 160 270 540 10 15,87 180 360 105 210 105 420 12 19,05 140 280 180 360 16 25,4 40 105 40 210 140 280 3.2 Coupling and assembling 3.2.1 coupling assembly assembled nut, ferrule
21、and pipe mating with e.g. nipple, union, elbow, see Figure 1 Key 1 Straight union 2 Nut 3 Ferrule Figure 1 Example of coupling assembly prEN 4560:2013 (E) 5 3.2.2 dimensional code corresponds to the nominal diameter given in 16thof inches within two digits 3.2.3 snug moment when positive resistance
22、to rotation is observed during assembling 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. Cracks
23、 are normally caused by overstressing the metal during forging or other forming operations, or during heat treatment. 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. Folds can
24、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,
25、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.
26、4.2 delivery batch batch consisting of couplings with the same identity block which may come from different production batches 3.4.3 acceptance quality limit (AQL) when a continuing series of lots is considered, a quality level which for the purposes of sampling inspection is the limit of a satisfac
27、tory process average prEN 4560:2013 (E) 6 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 redu
28、ce 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 effect
29、ive use or operation of this product 4 Requirements, inspection and test methods See Tables 2 and 3. Qualification tests given from 4.12 to 4.15 shall only be made when required. Complementary qualification tests may be determined in direct relation with the application (e.g. vibration test, thermal
30、 shock test). The coupling shown on the figures 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). Non removable coupling (e.g. welded elbow, welded reducer) shall be tested on sample pipes in combi
31、nation with removable (threaded) couplings. 4.1 Test conditions and preparation of specimens for qualification 4.1.1 Test 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,
32、stress corrosion and re-use capability testing. 4.1.2 Specimen preparation Shaped parts shall be machined with the grain flow of the bar or plate in the direction of the fluid. Installations on the coupling shall be in accordance with TR 2674. The coupling shall not be lubricated prior the first ass
33、embling. For the next assembling they shall be lubricated with engine oil (e.g. according to MIL-L-23699) at the interface between the nut and the ferrule. Prior to testing, and unless otherwise specified, all couplings with dimensional code up to 12 shall be assembled using either of the following
34、methods. For couplings with dimensional code greater than 12 the assembling shall be made by using the torque tightening method: torque tightening method: A torque value comprised between the minimum and the maximum given in Table 4 shall be applied to the nut per TR 2674. angle tightening method: T
35、he following sequence shall be applied: 1 tighten the nut with a wrench to snug; 2 turn the nut an additional 60 see Figure 2 a); prEN 4560:2013 (E) 7 3 loosen the nut; (for new parts assembling only); 4 retighten the nut with a wrench to snug; 5 turn the nut an additional 30 see Figure 2 b). Figure
36、 2 c) gives also a checking method by using and returning an open end wrench with a 15 offset. The torque tightening method used for the test and value applied shall be recorded. 4.1.3 Pipe assembly The method of joining the pipe to the coupling (brazing, welding, mechanical attachment, etc.) shall
37、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. a) c) b) Figure 2 Configuration for angle tightening method prEN 4560:2
38、013 (E) 8 Table 2 Requirements, inspection and test methods (1 of 3) Clause Characteristic Requirement Inspection and test method Q a A b 4.2 bMaterials Metallic materials shall meet the acceptance criteria given in EN 2951. Conformity with the product standards Metallic materials shall be tested in
39、 accordance with EN 2951. Certificate of compliance to EN 10204 issued by the semi-finished product manufacturer X 100 % X 100 % 4.3 bDimensions Conformity with the product standards Suitable measuring instruments X 100 % X 20 % 4.4 bProduct identification Marking according to product standards. It
40、shall be legible and shall not adversely affect the material or the functioning of the products. Visual examination X 100 % X 100 % 4.5 bSurface roughness Conformity with the product standards Interpreted in accordance with EN ISO 1302. Suitable measuring instruments or visual-tactile samples X 100
41、% X 200 % 4.6 bSurface coating or treatment Conformity with the product standards Visual examination X 100 % X 50 % 4.7 bSurface defects Parts shall be free from surface defects indicated in 3.3 liable to have an adverse effect on their characteristics and endurance. Visual inspection using suitable
42、 methods X 100 % X 100 % Threads The external threads of couplings should be rolled and, if machined, shall have a maximal value of 1,6 m for Rain accordance with EN ISO 1302. Laps, cracks, surface irregularities and seams (see 3.3) are not acceptable on any part of the pressure thread flank, in the
43、 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. Visual examination X 100 % X 100 % Dimensional code Depth mm 03 0,15 04 0,18 05 0,18 06 0,2 08 0,2
44、3 10 to 16 0,25 Threads may be cut or rolled. The grain flow in rolled threads shall be continuous and follow the general thread contour with the maximum density at the thread root. Thread flanks in rolled threads shall be examined by micro-examination. Specimens shall be taken from the finished par
45、t by sectioning on a longitudinal plane across the threaded area. The specimens shall be polished and etched to reveal the surface defects. X 2 specimensprEN 4560:2013 (E) 9 Table 2 Requirements, inspection and test methods (2 of 3) Clause Characteristic Requirement Inspection and test method Q a A
46、b 4.8 Proof pressure 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 the specified torque values. The coupling assembly shall be connected to a press
47、ure source at a pressure equal to proof pressure for at least five minutes at ambient temperature with one end free to move. X 4.9 Gaseous pressure 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
48、tightened to the torque 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 50) kPa with 0,5 % to 1 % of wetting agent (make up by volume) for at least five minutes, at ambient temperature. X 4.10 Burst pres
49、sure The coupling assembly 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 burst pressure for at least five minutes, when tested at ambient temperature with one end free to move. X 4.11 Re-use capability The coupling assemb
