ISO INTERNATIONAL STANDARD 8574 Second edition 2004-05-01 Aerospace Hydraulic system tubing Qualification tests for bent tubes Aéronautique et espace Tubes pour circuits hydrauliques Essais dequalificationpourtubescoudés Reference number ISO 8574:2004(E) @ ISO 2004 E*eqr[tkijvgf"d["WPG.'E1"1gpqxc."8I"4:226"Ocftkf.'Urckp"cm'tkij FUwp-Hgd-3:22-5,73"WVE*4246 ISO 8574:2004(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the @ISO2004 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 either Iso at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 · CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii E*eqr{tkijigf"d("WPG.'E1"gpqxc."8r4:226"Ocftkf.Urckp"cm'tkijw'tgugtxgf+*Uwp*Hgd’3:*225;73"WVE4246 @ ISO 2004 - All rights reserved ISO 8574:2004(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 non-governmental, in liaison with isO, also take part in the work. IsO collaborates closely with the International ElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. 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 8574 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 10, Aerospacefluidsystemsand components. This second edition cancels and replaces the first edition (iSO 8574:1990), which constitutes a minor revision ii E*eqr[tkijvgf"d["WPG.'E1"1gpqxc."8I"4:226"Ocftkf.'Urckp"cmn'tkijvu'tgugtxgf+*'Uwp"Hgd’3:22-5;<73"WVE"4246 n"hutvint'tnrtnfweiknni'cwintiInfl ISO 8574:2004(E) INTERNATIONAL STANDARD Aerospace Hydraulic system tubing Qualification tests for bent tubes 1 Scope This International Standard specifies pressure impulse and burst test procedures for determining and classifying the impulse fatigue strengths of bent tubes used in aerospace hydraulic systems. The procedures are intended for qualification purposes of high- and low-pressure system tubing or for the evaluation of new materials for hydraulic system tubing. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated (including any amendments) applies. Iso 6772, Aerospace - Fluid systems - Impulse testing of hydraulic hose, tubing and fitting assemblies 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 proof pressure static pressure for testing hydraulic system tubing, a prescribed multiple of the nominal system or sub-system pressure 3.2 tube failure leakage or rupture of