1、BRITISH STANDARD AEROSPACE SERIES BS 2M 53:1997 ISO 6773:1994 Aircraft Fluidsystems Thermalshock testing of piping and fittings ICS 49.080BS2M53:1997 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board
2、 and comes intoeffect on 15November1997 BSI 04-2000 ISBN 0 580 28786 6 National foreword This British Standard reproduces verbatim ISO6773:1994 and implements it as the UK national standard. It supersedes BSM53:1983 which is withdrawn. The UK participation in its preparation was entrusted to Technic
3、al Committee ACE/69, Aerospace hydraulic systems, fluids and components, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed
4、; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in thi
5、s document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. User
6、s of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theISO title page, pages ii to iv, pages
7、1 and 2 and a backcover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBS2M53:1997 BSI 04-2000 i Contents Page National f
8、oreword Inside front cover Foreword iii Text of ISO 6773 1ii blankBS2M53:1997 ii BSI 04-2000 Contents Page Foreword iii 1 Scope 1 2 Normative reference 1 3 Required characteristics 1 4 Method of test 1 Figure 1 Thermal shock test apparatus 2 Descriptors: Aircraft, aircraft equipment, hydraulic syste
9、ms, fluid circuits, piping, pipes (tubes), pipe fittings, tests, thermal shock tests.BS2M53:1997 BSI 04-2000 iii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards
10、 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 liaison with ISO, also take p
11、art in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Sta
12、ndard requires approval by at least75% of the member bodies casting a vote. International Standard ISO6773 was prepared by Technical Committee ISO/TC20, Aircraft and space vehicles, Subcommittee SC10, Aerospace fluid systems and components. This second edition cancels and replaces the first edition
13、(ISO6773:1982), the figure of which has been technically revised and the text clarified in places.iv blankBS2M53:1997 BSI 04-2000 1 1 Scope This International Standard provides an environmental test method for thermal shock testing of fluid system piping and fittings, excluding hose and hose assembl
14、ies. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on th
15、is International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 6772:1988, Aerospace Fluid systems Impulse testing of hydraulic hose,
16、 tubing and fitting assemblies. 3 Required characteristics The test assemblies shall not leak or burst during temperature and pressure cycling procedures described in clause4. 4 Method of test 4.1 Test apparatus The test assemblies shall be mounted in a test fixture similar to that shown in Figure 1
17、 capable of providing the specified test fluid, ambient temperatures and circuit pressures corresponding to the system classification specified in ISO6772. 4.2 Test fluid The specified test fluid shall be a system fluid or hydraulic fluid which is compatible with the item being tested and the specif
18、ied system pressure and temperature. 4.3 Hot test chamber testing Mount the test assemblies in a temperature chamber, connect them to a pressure source and fill them with the specified test fluid. Then pressurize the assemblies to at least the nominal circuit service pressure and raise the temperatu
19、re in the test chamber to at least the maximum specified for the circuit. Hold this temperature for a minimum of2h. At the end of this period, while still at at least the maximum temperature, release the hot test fluid and replace it within20s with test fluid initially at or below the minimum specif
20、ied temperature. Within an additional 20s, raise the test pressure to at least proof pressure and maintain this pressure for at least1min and then release it for at least an additional1min. Then repeat the1-min proof test. Observe the assemblies continuously during the two1-min pressurization period
21、s to determine any leakage. 4.4 Cold test chamber testing Following a cooling period to room temperature, re-apply at least the nominal circuit pressure and lower the chamber temperature to at least the minimum specified. Hold this temperature for a minimum of 2h. At the end of this period while sti
22、ll at low temperature, release the cold fluid and replace it with test fluid initially at at least the maximum circuit temperature within20s. Within an additional20s, raise the pressure to the proof pressure specified for the circuit, and maintain this pressure for at least1min. Observe the specimen
23、s closely to determine any leakage. 4.5 Test schedule The procedures described in4.3 or4.4 shall be repeated in sequence three times to complete the requirements of the thermal shock test.BS2M53:1997 2 BSI 04-2000 NOTEThe graphic symbols conform to ISO 1219-1:1991, Fluid power systems and components
24、 Graphic symbols and circuit diagrams Part 1: Graphic symbols. Figure 1 Thermal shock test apparatusblankBS 2M 53:1997 ISO 6773:1994 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents th
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