ISO INTERNATIONAL STANDARD 6773 Second edition 1994-10-01 Aerospace - Fluid systems - Thermal shock testing of piping and fittings Aéronautique et espace - Systemes de fluides Essai de choc thermique des tuyauteries et raccords Reference number ISO 6773:1994(E) nnarrwintklnf ISO 6773:1994(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work 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. Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 6773 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospace fluid systems and components. This secondeditioncancelsand replaces thefirst edition (IS0 6773:1982), the figure of which has been technically revised and the text clarified in places. ISO1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization CasePostale56·CH-1211Geneve20·Switzerland Printed in Switzerland ii ruintilnf ISO 6773:1994(E) INTERNATIONAL STANDARD ISO Aerospace - Fluid systems - Thermal shock testing of piping and fittings 1 Scope circuit pressures corresponding to the system classi- fication specified in ISO 6772. This International Standard provides an environmenta test method for thermal shock testing of fluid system 4.2 Test fluid piping and fittings, excluding hose and hose as- semblies. The specified test fluid shall be a system fluid or hy- draulic fluid which is compatible with the item being tested and the specified system pressure and tem- Normative reference perature. The following standard contains provisions which, through reference in this text, constitute provisions 4.3 Hot test chamber testing of this International Standard. At the time of publi- cation, the edition indicated was valid. All standards Mount the test assemblies in a temperature chamber, are subject to revision, and parties to agreements connect them to a pressure source and fill them with based on this International Standard are encouraged the specified test fluid. Then pressurize the as- to investigate the possibility of applying the most re- semblies to at least the nominal circuit service press cent edition of the standard indicated below. Mem ure and raise the temperature in the test chamber to bers of IEC and ISO maintain registers of currently at least the maximum specified for the circuit. Hold valid International Standards. this temperature for a minimum of 2 h. At the end of this period, while still at at least the maximum tem- IsO6772:1988,Aerospace Fluidsystems -Im- perature, release the hot test fluid and replace it pulse testing of hydraulic hose, tubing and fitting as- semblies. minimum specified temperature. Within an additional 20s,raisethetestpressuretoatleastproofpressure and maintain this pressure for at least 1 min and then 3Required characteristics release it for at least an additional 1 min. Then repeat the 1-min proof test. Observe the assemblies contin- The test assemblies shall not leak or burst during uously during the two 1-min pressurization periods to temperature and pressure cycling procedures de determine any leakage. scribed in clause 4. 4.4 Cold test chamber testing 4 Method of test Following a cooling period to room temperature, re- 4.1 Test apparatus apply at least the nominal circuit pressure and lo