ISO/TR TECHNICAL REPORT 10686 First edition 2013-07-01 Hydraulic fluid power - Method to relate the cleanliness of a hydraulic system to the cleanliness of the components and hydraulic fluid that make up the system Transmissions hydrauliques - Méthode de relation entre propreté d'un systeme hydraulique et proprete des composants et du fluide hydraulique qui composent le systeme Reference number IS0/TR 10686:2013(E) LSO @ IS0 2013 I without license from IHS Not for Resale IS0/TR 10686:2013(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested 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 0111 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved etworking permitted without license from IHS Not for Resale IS0/TR 10686:2013(E) Contents Page Foreword ..iv Introduction ..V 1 Scope. ..1 2 Normative references ..1 3 Terms and definitions 4 Symbols and units ..2 5 Basic considerations. .3 5.1 Particulate contamination .3 5.2 System knowledge requirements 5 6 Prediction from component cleanliness to system cleanliness (the bottom-up approach)..6 6.1 Principles 6 6.2 Determination of the cleanliness level of a component. .6 6.3 Prediction of cleanliness level of an assembled system .7 6.4 Prediction of cleanliness level of a new system upon its release from the manufacturing area. .7 6.5 Practical predictions ..8 7 Specifying the cleanliness requirements from system cleanliness level to component cleanliness level (the top-down approach) 9 7.1 Principle. .9 7.2 Specification of identical requirements. 9 7.3 Specification of different requirements. 9 8 Relationship between cleanliness levels per unit volume and cleanliness levels per unit surface area 10 8.1 V/Aratio 10 8.2 Impact of surface cleanliness level on fluid cleanliness level .10 Annex A (informative) Determination of geometrical characteristics of components .11 Annex B (informative) Example of calculation of the cleanliness of an assembled system from the cleanliness of individual components 12 Annex C (informative) Impact of surface cleanliness level on fluid cleanliness level ..17 Annex D (informative) Relating volume to surface area .20 Annex E (informative) Relating the cleanliness of parts to the cleanliness of components ..21 Bibliography .24 iii ut license from IHS Not for Resale