1、BSI Standards PublicationBS ISO 19631:2015Aerospace series Tubefittings for fluid systems, 5 080psi (35 000 kPa) QualificationspecificationBS ISO 19631:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 19631:2015. The UK participation in its preparation was
2、entrusted to TechnicalCommittee ACE/69, Aerospace hydraulic systems, fluids and components.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 contract. Users are responsible
3、for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 73623 0 ICS 49.080 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Polic
4、y and Strategy Committee on 30 September 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 19631:2015 ISO 2015Aerospace series Tube fittings for fluid systems, 5 080 psi (35 000 kPa) Qualification specificationSrie arospatiale Raccordements de tubes pour les systm
5、es fluides, 5 080 psi (35 000 kPa) Spcification de qualificationINTERNATIONAL STANDARDISO19631First edition2015-09-01Reference numberISO 19631:2015(E)BS ISO 19631:2015ISO 19631:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. U
6、nless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at th
7、e address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 19631:2015ISO 19631:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative
8、references 13 Requirements 13.1 Qualification 13.1.1 Manufacturer qualification . 13.1.2 Product qualification 23.2 Materials . 23.2.1 Fittings 23.2.2 Tubing . 23.2.3 Testfluid . 23.3 Environmental conditions . 33.3.1 Pressures 33.3.2 Temperature 33.4 Design and manufacture . 33.4.1 Fluid passages 3
9、3.5 Performance 33.5.1 Specimen preparation . 33.5.2 Proof pressure 43.5.3 Gaseous pressure. 43.5.4 Hydraulic impulse resistance 43.5.5 Ultimate pressure 53.5.6 Flexure fatigue resistance 53.5.7 Re-use capability 53.5.8 Tensile load capability . 63.5.9 Thermal shock . 63.5.10 Over-tightening . 63.5.
10、11 Electrical conductivity 63.5.12 Salt spray 73.5.13 Vibration . 73.5.14 Fire test . 113.5.15 System pressure test 113.5.16 Fuel ageing .123.5.17 Hydraulic fluid ageing 123.5.18 Tube twisting .123.5.19 Fitting/tube rotation torque . 133.5.20 Stress corrosion .143.5.21 Lightning strike 16Annex A (no
11、rmative) Equivalent materials and processes 18Bibliography .20 ISO 2015 All rights reserved iiiContents PageBS ISO 19631:2015ISO 19631:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepa
12、ring International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in l
13、iaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC D
14、irectives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that
15、 some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent dec
16、larations received (see www.iso.org/patents). Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information
17、 about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components.iv ISO 201
18、5 All rights reservedBS ISO 19631:2015ISO 19631:2015(E)IntroductionThis International Standard establishes the basic performance for 5 080 psi (35 000 kPa) tube fitting assemblies used in aerospace fluid systems.The test requirements are intended to satisfy the most strenuous demands encountered in
19、a high-performance aircraft hydraulic system.International Standards use the International System of units (SI); however, large segments of the aerospace industry make use of other measurement systems as a matter of common working practice.All dimensions and units used in this International Standard
20、 are given in SI units, with other units also indicated for the convenience of the user.The decimal sign used in International Standards is the comma (“,”); however, the comma is not used in common working practice with non-SI dimensions. Therefore, in common with many other aerospace standards, the
21、 decimal point (“.”) is used in this International Standard when providing dimensions in inch-pound units.NOTE The use of non-SI units and the decimal point in this International Standard does not constitute general acceptance of measurement systems other than SI within International Standards. ISO
22、2015 All rights reserved vBS ISO 19631:2015BS ISO 19631:2015Aerospace series Tube fittings for fluid systems, 5 080 psi (35 000 kPa) Qualification specification1 ScopeThis International Standard specifies performance and quality requirements for the qualification and manufacture of standard tube fit
23、tings to ensure reliable performance in aircraft hydraulic 5 080 psi (35 000 kPa) systems.This International Standard specifies baseline criteria for the design and manufacture of system fittings that are qualification tested on engines.This International Standard covers fittings from size 04 to 20
24、used for the following: separable/permanent pipe end fittings; permanent connection fittings; separable connection fittings.This International Standard covers fittings of the temperature types and pressure classes specified in ISO 6771.2 Normative referencesThe following documents, in whole or in pa
25、rt, 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.ISO 2685, Aircraft Environmental test procedure fo
26、r airborne equipment Resistance to fire in designated fire zonesISO 6772, Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assembliesISO 6773, Aerospace Fluid systems Thermal shock testing of piping and fittingsISO 7137, Aircraft Environmental conditions and test procedu
27、res for airborne equipmentISO 7257, Aircraft Hydraulic tubing joints and fittings Rotary flexure testISO 10583:1993, Aerospace fluid systems Test methods for tube/fitting assembliesEUROCAE ED-14E/RTCA DO-160E, Section 22, Lightning Induced transient Susceptibility3 Requirements3.1 QualificationFitti
28、ngs claiming conformity with this International Standard shall be representative of products, which have successfully met the requirements and have passed the tests in this International Standard.3.1.1 Manufacturer qualificationManufacturer approval shall be granted by purchaser qualification proced
29、ure.INTERNATIONAL STANDARD ISO 19631:2015(E) ISO 2015 All rights reserved 1BS ISO 19631:2015ISO 19631:2015(E)Outside agency procedure can be used if no specific procedure exists (see Annex A, Table A.3, Procedure 1).3.1.2 Product qualificationProduct approval shall be granted by purchaser qualificat
30、ion procedure.Outside agency procedure can be used if no specific procedure exists (see Annex A, Table A.3, Procedure 1).3.2 Materials3.2.1 FittingsFitting parts shall be manufactured from materials as given in Table 1 or equivalent passing the specified tests. The various materials shall be used ac
31、cording to the pressure and temperature requirements of the system, as shown in Table 2.Table 1 Materials for fittingsMaterial TypeaMaterial code Starting stockTitanium alloy I, II, III T Bar, forgings, or ringsCorrosion-resistant steel I, II, III, IV V Bar, forgings, or ringsOther To be defined To
32、be defined To be definedaTemperature types and system pressure classes are defined in ISO 6771.Magnesium and magnesium alloy shall not be used.3.2.2 TubingTable 2 Materials for tubingMaterial Material code Starting stockTitanium alloy T HollowsCorrosion-resistant steel V HollowsOther To be defined T
33、o be defined3.2.3 TestfluidUnless otherwise specified, fluid for testing shall be used in accordance with Annex A, Table A.1.2 ISO 2015 All rights reservedBS ISO 19631:2015ISO 19631:2015(E)3.3 Environmental conditions3.3.1 PressuresTable 3 Pressure test requirements, 35 000 kPa (5 080 psi) fittingsD
34、imensions in SI-metric (and imperial) unitsFitting and tube sizeaDesign operating pressure(DOP)Proof pressure(2 DOP)Burst pressure(3 DOP)kPa (psi) kPa (psi) kPa (psi)0435 000 (5 080) 70 000 (10 160) 105 000 (15 240)060810121620aDash size in 1/16 in, example: 08 = 8/16 in diameter.3.3.2 Temperature3.
35、2.2.1 Ambient Air: 54 C to +135 C3.2.2.2 Hydraulic Fluid: 54 C to +135 C3.4 Design and manufacture3.4.1 Fluid passagesOn fittings where the fluid passage is drilled from each end, the offset between the drilled holes at the meeting point shall not exceed 0,25 mm (0.10 in). It shall be possible to pa
36、ss through the fitting passage a ball whose diameter is 0,37 mm (0.015 in) less than the minimum diameter specified for the passage.Angular misalignment shall not exceed 1 for straight fittings and 2 for shaped fittings.3.5 PerformanceThe tubing/fitting assembly shall be capable of meeting the perfo
37、rmance requirements specified in 3.5.1 to 3.5.21.3.5.1 Specimen preparationTest specimens shall be assembled as specified in Table 11. Sleeve installations on the tube end shall be in accordance with user instructions.The fitting shall be assembled to tightening torques given by purchaser procuremen
38、t specification, using the maximum installing torque for half of the test specimens and the minimum torque for the other half.3.5.1.1 LubricantsHydraulic system fittings shall be assembled using system fluid as lubricant on the union thread and sleeve shoulder only. No lubricant on the sealing surfa
39、ces (especially during pneumatic leakage testing) is allowed. ISO 2015 All rights reserved 3BS ISO 19631:2015ISO 19631:2015(E)3.5.1.2 Qualification inspectionTest assemblies shall consist of the parts specified in 3.5.1. Tests shall be conducted in accordance with Table 11 and with ISO 10583 for eac
40、h size and material for which qualification is required.Fittings claiming conformity with this specification shall be considered qualified if they are manufactured to the same dimensions, using the same materials and processes as products that have successfully met the requirements and have passed t
41、he tests in this specification.3.5.2 Proof pressureWhen testing in accordance with ISO 10583:1993, 5.1, the test assembly shall withstand the proof pressure specified in Table 3 without leakage, evidence of permanent deformation, or other malfunction that might affect the ability to disconnect or co
42、nnect the joint in the normal manner (to the interface point by hand and then using the specified range of torque values).Specimens to be proof tested are given in Table 11.3.5.3 Gaseous pressureWhen tested in accordance with ISO 10583:1993, 5.2, assemblies shall pass the gaseous pressure test to th
43、e DOP specified in Table 3 without leakage or other failure.Specimens to be gaseous pressure tested are given in Table 11.3.5.4 Hydraulic impulse resistanceSix specimens shall be tested with the following distribution: 2 non aged specimens; 2 fuel aged specimens as per 3.5.16; 2 hydraulic fluid aged
44、 specimens as per 3.5.17.When tested in accordance with ISO 6772 and ISO 10583:1993, 5.3, the test assembly shall withstand, without leakage, 300 000 impulse pressure cycles with pressure peaks specified and temperatures in Table 4.Table 4 Peak pressure and temperaturePeak pressure% of nominal press
45、urePeak pressurekPa (psi)Maximum ambient temperatureMinimum ambient tem-perature15052 500(7 620)+94 C(+201 F)40 C(40 F)After hydraulic impulse test, three specimens (1 non aged, 1 fuel aged, and 1 hydraulic fluid aged) shall be tested at nominal torque and pass the pressure tests as per 3.5.3 and 3.
46、5.15.For margin evaluation, testing is to be continued on the other three specimens at +110 C (+230 F) up to failure or completion 450 000 cycles.Specimens which passed these additional cycles shall pass to minimum burst pressure test as per 3.5.5.Specimens to be impulse tested are given in Table 11
47、.4 ISO 2015 All rights reservedBS ISO 19631:2015ISO 19631:2015(E)3.5.5 Ultimate pressureWhen tested as follows, the test assemblies shall be pressurized to the burst pressure specified in Table 3 and held at that pressure for 3 min after stabilization of the pressure. The pressure shall then be incr
48、eased at a rate of 137 894 kPa/min 34 474 kPa/min (20 000 psi/min 5 000 psi/min) until failure occurs. No burst, slippage, leakage, or other failure shall occur at a pressure below 4 DOP.Seven specimens shall be tested to failure with the following distribution: Two non aged specimens shall be teste
49、d at +94 C (+201 F). Two aged specimens after salt spray as per 3.5.11 at +94 C (+201 F). Three specimens from hydraulic impulse resistant (3.5.3) at room temperature.Specimens to be ultimate pressure tested are given in Table 11.3.5.6 Flexure fatigue resistanceWhen tested in accordance with ISO 7257 and ISO 10583:1993, 5.5, test assemblies shall not fail.Eight specimens with straight unions shall be tested. Two specimens shall withstand 107flexure cycles with a bending
