Aerospace — Fluid systems and components — Pressure and temperature classifications

ISO 6771:2007 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 ranges represent systems that are in less common use or that are used in developmental systems.

Aéronautique et espace — Systèmes de fluides et éléments constitutifs — Classification des températures et des pressions

General Information

Status
Published
Publication Date
29-Jul-2007
Current Stage
9093 - International Standard confirmed
Completion Date
21-Nov-2019
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ISO 6771:2007 - Aerospace -- Fluid systems and components -- Pressure and temperature classifications
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INTERNATIONAL ISO
STANDARD 6771
Third edition
2007-08-15


Aerospace — Fluid systems and
components — Pressure and temperature
classifications
Aéronautique et espace — Systèmes de fluides et éléments
constitutifs — Classification des températures et des pressions





Reference number
ISO 6771:2007(E)
©
ISO 2007

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ISO 6771:2007(E)
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ii © ISO 2007 – All rights reserved

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ISO 6771:2007(E)
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 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
International 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
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 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 (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.
© ISO 2007 – All rights reserved iii

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ISO 6771:2007(E)
Introduction
Aerospace fluid systems and components are generally designed and marked for a specific fluid pressure
class and temperature type.

iv © ISO 2007 – All rights reserved

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INTERNATIONAL STANDARD ISO 6771:2007(E)

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 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 definitions 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 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 harmonization 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 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 commonly used in the United States and Europe
...

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