1、BRITISH STANDARD BS ISO 6771:2007 Aerospace Fluid systems and components Pressure and temperature classifications ICS 49.080 BS ISO 6771:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007 ISBN 978 0 580 55824 5 Na
2、tional foreword This British Standard is the UK implementation of ISO 6771:2007. It supersedes BS 2M51:1989 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ACE/69, Aerospace hydraulic systems, fluids and components. A list of organizations represented
3、 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 for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments iss
4、ued since publication Amd. No. Date Comments Reference number ISO 6771:2007(E)INTERNATIONAL STANDARD ISO 6771 Third edition 2007-08-15 Aerospace Fluid systems and components Pressure and temperature classifications Aronautique et espace Systmes de fluides et lments constitutifs Classification des te
5、mpratures et des pressions BS ISO 6771:2007ii 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 is normally carried out through ISO technical committees. Each
6、 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 part in the work. ISO collaborates closely with the Internationa
7、l Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards
8、 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of
9、 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6771 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components. This third edition cancels and replaces the second edition
10、 (ISO 6771:1987), which has been technically revised. This third edition adds imperial unit equivalents, and the nominal temperatures and pressures for all classes have been revised. BS ISO 6771:2007iv Introduction Aerospace fluid systems and components are generally designed and marked for a specif
11、ic fluid pressure class and temperature type. BS ISO 6771:20071 Aerospace Fluid systems and components Pressure and temperature classifications 1 Scope This International Standard specifies the pressure classes and temperature types for the basic systems and component systems that are commonly used
12、in aerospace fluid systems. Classes and types in the lower ranges represent systems in common use. Those in the higher ranges represent systems that are in less common use or that are used in developmental systems. 2 Terms and definitions For the purposes of this document, the following terms and de
13、finitions apply. 2.1 basic system temperature types and pressure classes of the aircraft fluid systems, usually specified in the aircraft specification, with which the vehicle is designed to be operated NOTE 1 The basic system consists of several subsystems. NOTE 2 The temperature type and pressure
14、classes are tested and certified as an integral part of vehicle performance. 2.2 component system system whose temperature types and pressure classes are usually defined in the product specification NOTE 1 The components are tested and qualified individually under each subsystem. NOTE 2 The harmoniz
15、ation of temperature and pressure tolerances is accomplished in the component systems so that one product can be used in both systems, metric or imperial, and attain the same degree of performance of the subsystem. 3 Classification 3.1 Basic system 3.1.1 General The pressure classes and temperature
16、types for the basic systems are as specified in Tables 1 and 2. No tolerance is permitted in the basic systems. 3.1.2 Pressure classes Nominal system pressure classes for the basic systems shall be as specified in Table 1. The old pressure classes designated in Table 1 are the existing systems commo
17、nly used in the United States and Europe. The equivalent pressures as shown are mathematically converted from the basic systems for comparison only and should not be used in the basic systems. BS ISO 6771:20072 Table 1 Nominal system pressure classes for the basic systems Metric system Imperial syst
18、em Pressure values Pressure values Pressure classes Old pressure classes kPa (bar) abasic psi equivalent bOld pressure classes psi basic kPa equivalent cA A 4 000 (40) 580 600 600 4 137 B B 10 500 (105) 1 522 1 500 1 500 10 342 H d 14 000 (140) d2 031 2 000 2 000 13 790 C C 16 000 (160) 2 321 2 500
19、d17 237 D D 21 000 (210) 3 046 3 000 3 000 20 684 E E 28 000 (280) 4 061 4 000 4 000 27 579 J d 35 000 (350) d5 076 5 000 5 000 34 474 F F 40 000 (400) 5 802 6 000 d41 368 G G 50 000 (500) 7 252 7 000 d48 263 K d 55 000 (550) d7 977 8 000 8 000 55 158 a1 bar = 100 kPa. b1 kPa (kilopascal) = 0,145 03
20、8 1 psi (pound-force per square inch). c1 psi (pound-force per square inch) = 6,894 74 kPa (kilopascal). dAdditional pressure classes for future application. 3.1.3 Temperature types Types of system operating temperature for the basic systems shall be as specified in Table 2. The old temperature type
21、s as shown in Table 2 are the existing systems commonly used by the United States and Europe. Some new temperature types are added in this revision for future application. The tolerances are not allowed in the basic systems. Table 2 Types of system operating temperature for basic systems Metric syst
22、em Imperial system Old temperature type Temperature range Old temperature type Temperature range Temperature type C F 07 I 55 to 71 I 65 to 160 09 55 to 95 65 to 200 13 II 55 to 135 II 65 to 275 20 III 55 to 200 65 to 400 23 55 to 235 III 65 to 460 32 IV 55 to 320 65 to 600 40 V 55 to 400 65 to 750
23、42 55 to 425 65 to 800 45 55 to 450 65 to 840 55 55 to 550 65 to 1 020 65 VI 55 to 650 65 to 1 200 73 55 to 730 65 to 1 350 76 55 to 760 65 to 1 400 NOTE Formula used in temperature conversion: X F = 32 + 9/5 Y C or Y C = 5/9 (X F 32). BS ISO 6771:20073 3.2 Component system 3.2.1 Pressure classes No
24、minal system pressure classes for the component systems shall be as specified in Table 3. The tolerance values as shown are to be used for conversion from one system to another. To qualify for both systems, the higher pressure shall be used. Table 3 Nominal system pressure classes for the component
25、systems Metric system Imperial system Pressure classes Nominal pressure kPa (bar) a,bHarmonize tolerance kPa upper value/ lower value kPa Nominal pressure psi cHarmonize tolerance psi upper value/ lower value psi 4 137 600 A 4 000 (40) +137 4 000 600 20 580 10 500 1 523 B 10 500 (105) 158 10 342 1 5
26、00 +23 1 500 14 000 2 031 H d14 000 (140) 211 13 789 2 000 +31 2 000 17 237 2 500 C 16 000 (160) +1 237 16 000 2 500 179 2 321 21 000 3 046 D 21 000 (210) 316 20 684 3 000 +46 3 000 28 000 4 061 E 28 000 (280) 421 27 579 4 000 +61 4 000 35 000 5 076 J d35 000 (350) 526 34 474 5 000 +76 5 000 41 368
27、6 000 F 40 000 (400) +1 368 40 000 6 000 a198 5 802 50 000 7 252 G 50 000 (500) 1 737 48 263 7 000 a+252 7 000 55 158 8 000 K d55 000 (550) +158 55 000 8 000 23 7 977 a1 bar = 100 kPa. b1 kPa (kilopascal) = 0,145 038 1 psi (pound-force per square inch). c1 psi (pound-force per square inch) = 6,894 7
28、4 kPa (kilopascal). dAdditional pressure classes for future application.3.2.2 Temperature types The old temperature types as used in Table 4 are from the existing systems commonly used in the United States and Europe. The new temperature types are additional temperatures added in this revision for f
29、uture broader application. To qualify for both systems, the higher temperature range shall be used. BS ISO 6771:20074 Table 4 Types of system operating temperature for component systems Metric System Imperial System Temperature type Old temperature type Temperature range Lower temperature Field of t
30、olerance Upper temperature Field of tolerance Old temperature type Temperature range Lower temperature Field of tolerance Upper temperature Field of tolerance C F 07 I 55 to 71 55 54 71 70 I 65 to 160 67 65 160 158 09 55 to 95 55 54 95 93 65 to 200 67 65 203 200 13 II 55 to 135 55 54 135 135 II 65 t
31、o 275 67 65 275 275 20 III 55 to 200 55 54 204 200 65 to 400 67 65 400 392 23 55 to 235 55 54 238 235 III 65 to 460 67 65 460 455 32 IV 55 to 320 55 54 320 316 65 to 600 67 65 608 600 40 V 55 to 400 55 54 400 399 65 to 750 67 65 752 750 42 55 to 425 55 54 427 425 65 to 800 67 65 800 797 45 55 to 450
32、 55 54 450 449 65 to 840 67 65 842 840 55 55 to 550 55 54 550 549 65 to 1 020 67 65 1 022 1 020 65 VI 55 to 650 55 54 650 649 65 to 1 200 67 65 1 202 1 200 73 55 to 730 55 54 732 730 65 to 1 350 67 65 1 350 1 346 76 55 to 760 55 54 760 760 65 to 1 400 67 65 1 400 1 400 NOTE Formula used in temperatu
33、re conversion: X F = 32 + 9/5 Y C or Y C = 5/9 (X F 32). BS ISO 6771:2007 blankBS ISO 6771:2007 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe
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