ISO INTERNATIONAL STANDARD 27892 First edition 2010-02-01 Vacuum technology Turbomolecular pumps Measurement of rapid shutdowntorque Techniqueduvide-Pompesturbomoleculaires-Mesurage du couple d'arret rapide Reference number ISO27892:2010(E) @ISO2010 Copyright Intemational Organization for Standardization Not for Resale without license from IHS ISO27892:2010(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 the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHTPROTECTEDDOCUMENT ISO2010 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Case postale 56·CH-1211Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISO 2010 All rights reserved without license from IHS Not for Resale ISO27892:2010(E) Contents Page Foreword .iv Introduction 1 Scope. 2 Normative references 3 Terms and definitions.. 4 Symbols, definitions, and units .... 2 5 Destructivetestmethodsforturbomolecularpumps..... 5.1 General.... 5.2 Itemstobechecked... 5.3 Test conditionsfor burst and crash (failure of rotor bodyand rotor blades) 5.4 Destructive test equipment.... 5.5 Destructivetestprocedures. 5.6 "Crash"destructivetest method (failure of rotor or stator blades) .9 6 Test report. Annex A (informative) Details to be stated in technical drawings and documents. 15 Bibliography.. 16 ii CopyrightIntemationalOnizaSandardzalonghtsreserved lout license from IHS Not for Resale ISO27892:2010(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 InternationalElectrotechnicalCommission(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 ISO27892 was preparedby Technical Committee ISO/TC 112,Vacuum technology @ISO 2010-All rights reserved onal Organization for Standardizatior Not for Resale ISO27892:2010(E) Introduction A rotating turbomolecular pump or molecular drag pump has a large amount of energy stored in the rotor due to the high rotational frequency. If the rotor breaks, this energy is released in a very short time and there is the This International Standard is based on results compiled in studies of these possibilities and has been drafted users The core contents of this International Standard are the test methods for rapid shutdown torque measurement of turbomolecular pumps and molecular drag pumps. pumps and pumps which contain both technologies on the same shaft. aghred without ficense from IHS Not for Resale arda Not fr Resale INTERNATIONAL STANDARD ISO27892:2010(E) Vacuum technology Turbomolecular pumps Measurement of rapid shutdown torque 1 Scope This International Standard specifies a method for the measurement of rapid shutdown torque (destructive channels. The main forces leading to failure of turbomolecular pumps are torques a