ISO INTERNATIONAL STANDARD 20844 Second edition 2015-09-01 Petroleum and related products Determination of the shear stability of polymer-containing oils using a diesel injector nozzle Pétrole et produits connexes - Détermination de la stabilité au cisaillement de fluides contenant des polymeres au moyen d'un injecteurpour moteurdiesel Reference number ISO 20844:2015(E) SO International Organization for Standardization @ IS0 2015 dardization 5956617 ed without license from IHS IS0 20844:2015(E) COPYRIGHTPROTECTEDDOCUMENT IS02015,PublishedinSwitzerland 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 copyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org PrganizationforStandardization Not for Resale, 2015/11/11 06:53:29 etworking permitted without license from IHS IS0 20844:2015(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ...1 3 Terms and definitions 4 Principle ..2 5 Reagents and materials ..2 6 Apparatus .2 6.1 Test rig. .2 6.2 Viscosity measuring apparatus 7 Samples and sampling ..2 8 Preparation of test rig ..3 9 Referencing ..4 10 Procedure. ..4 11 Calculation .5 12 Expression of results ..5 13 Precision .5 13.1 General 13.2 Repeatability .5 13.3 Reproducibility .. 6 14 Test report Annex A (normative) Test rig Bibliography .10 iii see=Zhejiang Institute of Standardization 5956617 vided by IHS under lic se with ISt withoutlicense from IHS