ISO/TR TECHNICAL REPORT 15640 First edition 2011-12-15 Hydraulic fluid power contamination control General principles and guidelines for selection and application of hydraulic filters Verificationdela contamination des transmissionshydrauliques Principes generaux et lignes directrices pour I'application et la selection desfiltreshydrauliques Reference number ISO/TR 15640:2011(E) SO @ISO2011 HS unde itted without license from IHS Not for Resale ISO/TR15640:2011(E) COPYRIGHTPROTECTEDDOCUMENT ISO2011 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 memberbody in the country of therequester. 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 2011 -All rights reserved No reproduction or networking permited without license from IHS Not for Resale ISO/TR15640:2011(E) Contents Page Foreword ..iv Introduction 1 Scope. 2 Normative references. 3 Terms and definitions.. 4 Types and sourcesof contamination. 4.1 General... 4.2 Solid contaminants 4.3 Liquidcontaminants 4.4 Gaseous contaminants. 3 5 Effects ofparticulate contamination and thebenefitsof its removal 3 5.1 General... 5.2 Failurescausedbyparticulatecontamination 4 5.3 Benefitsoffiltrationtoreducesolidparticulatecontamination 6 Evaluationofcleanliness 4 6.1 General 4 6.2 Particle size rangeof interest 6.3 Methods of measuringand monitoring solid particulate contaminants 5 7 Codingsystemsforexpressinglevelof solidparticulatecontamination 6 7.1 General..... 6 7.2 Iso4406codingsystem.. 7.3 NAS1638,SAEAS4059andISO11218codingsystems 8 Setting required cleanlinesslevels (RCLs)fora hydraulic system 9 Cleanlinessmanagementconcepts 9 9.1 Systemdesign considerations. 9 9.2 Monitoring systemcleanliness. 9 9.3 Systemmaintenanceforcleanlinessmanagement 10 10 Filters. 11 10.1 Mechanisms of filtration. 11 10.2 General filter concepts... 12 10.3 Types of filters and filter elements. 14 10.4 Filter accessories...... 15 11 Filter evaluation 11.1 General 16 11.2 Laboratory filtertest methods 16 12 Filter selection process 18 12.1 General. .18 12.2 System definition and setting of the RCL 18 12.3 Selectingtheminimum recommendedfilterrating. 19 12.4 Filter location... 20 12.5 Filter sizing..... 23 12.6 Assessmentof candidatefilters. 24 12.7 Verification of correct filter selection. .24 13 Summary 25 AnnexA(informative)Typesoffiltersandseparators .26 Bibliography. ii thout license from IHS Not for Resale