1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58and temperature classificationsICS 49.080Aerospace Fluid systems and components Pressure BRITISH ST
2、ANDARDBS ISO 6771:2007BS ISO 6771:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 28 September 2007 BSI 2007ISBN 978 0 580 55824 5Amendments issued since publicationAmd. No. Date Commentscontract. Users are responsible for its correct app
3、lication.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis 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 It supersedes BS 2M51:1989 which is withdrawn.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/
4、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 Reference numberISO 6771:2007(E)INTERNATIONAL STANDARD ISO6771Third
5、edition2007-08-15Aerospace Fluid systems and components Pressure and temperature classifications Aronautique et espace Systmes de fluides et lments constitutifs Classification des tempratures et des pressions BS ISO 6771:2007ii iiiForeword ISO (the International Organization for Standardization) is
6、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 member body interested in a subject for which a technical committee has been established has the right to be represent
7、ed on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are dra
8、fted 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 adopted by the technical committees are circulated to the member bodies for voting. Publication as an International St
9、andard 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 patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6771 was prepared
10、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 (ISO 6771:1987), which has been technically revised. This third edition adds imperial unit equivalents, and the nomina
11、l 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 specific fluid pressure class and temperature type. BS ISO 6771:20071Aerospace Fluid systems and components Pressure and temp
12、erature classifications 1 Scope This International Standard specifies the pressure classes and temperature types for the basic systems and component systems that are commonly used in aerospace fluid systems. Classes and types in the lower ranges represent systems in common use. Those in the higher r
13、anges 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 definitions apply. 2.1 basic system temperature types and pressure classes of the aircraft fluid systems, usually specifie
14、d 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 classes are tested and certified as an integral part of vehicle performance. 2.2 component system system whose temperatu
15、re 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 harmonization of temperature and pressure tolerances is accomplished in the component systems so that one product can be used in
16、 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 types for the basic systems are as specified in Tables 1 and 2. No tolerance is permitted in the basic systems. 3.1.2 Pr
17、essure 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 commonly used in the United States and Europe. The equivalent pressures as shown are mathematically converted from the basic
18、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 system Pressure values Pressure values Pressure classes Old pressure classes kPa (bar) abasic psi equivalent bOld pressure c
19、lasses 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 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 00
20、0 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) = 0,145 038 1 psi (pound-force per square inch). c1 psi (pound-force per square inch) = 6,894 74 kPa (kilopascal). dAdditional pre
21、ssure 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 types as shown in Table 2 are the existing systems commonly used by the United States and Europe. Some new temperature types
22、 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 system Imperial system Old temperature type Temperature range Old temperature type Temperature range Temperature type C F 07
23、 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 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
24、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 6771:200733.2 Component system 3.2.1 Pressure classes Nominal system pressure classes for the component systems shall be as specified in Table 3. The tolerance values as shown a
25、re 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 systems Metric system Imperial system Pressure classes Nominal pressure kPa (bar) a,bHarmonize tolerance kPa upper value/
26、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 1 500 +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
27、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 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
28、 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 74 kPa (kilopascal). dAdditional pressure classes for future application.3.2.2 Temperature types The old temperature types a
29、s 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 future broader application. To qualify for both systems, the higher temperature range shall be used. BS ISO 6771:20074 Table
30、 4 Types of system operating temperature for component systems Metric System Imperial System Temperature type Old temperature type Temperature range Lower temperature Field of tolerance Upper temperatureField of tolerance Old temperaturetype Temperaturerange Lower temperature Field of tolerance Uppe
31、r temperatureField 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 to 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 4
32、55 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 55 54 450 449 65 to 840 67 65 842 840 55 55 to 550 55 54 550 549 65 to 1 02067 65 1 022 1 020 65 VI 55 to 650 55 54 650 649 65
33、 to 1 20067 65 1 202 1 200 73 55 to 730 55 54 732 730 65 to 1 35067 65 1 350 1 346 76 55 to 760 55 54 760 760 65 to 1 40067 65 1 400 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 6771:2007blankBS ISO BSI389 Chiswick High RoadLondonW4 4AL6771:2007
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