ISO 6772:2012

INTERNATIONAL ISO
STANDARD 6772
Third edition
2012-10-01
Aerospace — Fluid systems — Impulse
testing of hydraulic hose, tubing and
fitting assemblies
Aéronautique et espace — Systèmes de fluides — Essai d’impulsion
des tuyauteries flexibles, tubes et raccords
Reference number
©
ISO 2012
© ISO 2012
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ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 1
4.1 Shape of impulse trace . 1
4.2 Calculation of pressure rise . 2
4.3 Preparation of specimens . 2
4.4 Test fluid . 3
5 Principle of test . 3
6 Test method . 3
7 Intended use. 4
7.1 Standard . 4
7.2 Reference . 4
Bibliography . 6
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 6772 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 6772:1988), which has been technically
revised. The main changes are as follows:
— 3.2: definition has been modified;
— Clause 5: new paragraph has been added;
— Tables 1, 2 and 3 have been modified to cover additional classes J and K.
iv © ISO 2012 – All rights reserved

Introduction
In hydraulic systems, power is transmitted through the hydraulic fluid under pressure with a network of
tubing and hoses, and their attendant fitting assemblies. In order to demonstrate that these transmission
elements are fit for purpose in terms of the prevention of premature failures due to fatigue, it is necessary
to conduct appropriate impulse pressure testing.
This document provides the overall requirements for pressure impulse testing of hydraulic system
distribution elements.
INTERNATIONAL STANDARD ISO 6772:2012(E)
Aerospace — Fluid systems — Impulse testing of hydraulic
hose, tubing and fitting assemblies
1 Scope
This International Standard specifies the requirements and the procedures for impulse testing of hose,
tubing, and fitting assemblies for use in aerospace hydraulic systems. Requirements may apply, when
appropriate, to components used in other aerospace fluid systems.
2 Normative references
The following documents, in whole or
...