ISO INTERNATIONAL STANDARD 13909-4 Second edition 2016-07-01 Hard coal and coke Mechanical sampling - Part 4: Coal Preparation of test samples Houille et coke - Echantillonnage mécanique - Partie 4: Charbon Préparation des échantillons pour essai Reference number IS0 13909-4:2016(E) ISO International Organization for Standardization @ IS0 2016 HEJIANG INSTOFSTANDARDIZATION C15956617 ed without license from IHS IS0 13909-4:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,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. IsOcopyrightoffice Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+41 22 749 0111 Fax+41227490947 copyright@iso.org www.iso.org Intenationai br PrganizationforStandardization ensee-ZHEJIANG INST OF STANDARDIZRoISQ ,6 - All rights reserved I by IHS unde Not for Resale, 2016/8/16 08:26:4 etworking permitted without license from IHS IS0 13909-4:2016(E) Contents Page Foreword ..V Introduction. ...vi 1 Scope 2 Normative references 3 Terms and definitions 4 Precision of sample preparation .1 5 Constitution of a sample .2 5.1 Introduction .2 5.2 Combination of increments.. .2 5.2.1 Time-basis sampling .2 5.2.2 Mass-basis sampling 5.3 Combination of samples.. ..3 6 Division. .3 6.1 General 6.2 Mechanical methods .10 6.2.1 General. 10 6.2.2 Mass of cut. ..10 6.2.3 Interval between cuts .10 6.2.4 Division of individual increments ..10 6.2.5 Division of samples. .13 6.3 Manual methods .14 6.3.1 Rifflemethod ..14 6.3.2 Flattened-heap method .. 15 6.3.3 Strip-mixing and splitting method ..17 7 Reduction. .19 7.1 General .19 7.2 Reduction mills .19 8 Mixing. ..19 9 Air-drying. .19 10 Preparation of samples for specific tests .20 10.1 Types of test samples 20 10.2 Preparation of samples for determination of total moisture only 20 10.2.1 General 20 10.2.2 Storage .22 10.2.3 Sample reduction 22 10.2.4 Sample division .23 10.3 Preparation of samples for general analysis only 23 10.3.1 General 23 10.3.2 Air-drying 23 10.3.3 Reduction and division, 23 10.4 Common samples.. 24 10.4.1 General 24 10.4.2 Extraction of moisture sample by mechanical division 25 10.4.3 Extraction of moisture sample by manual method 25 10.5 Preparation of size-analysis sample .26 10.6 Preparation of samples for other tests .27 11 Reserve sample .28 12 Design of equipment for preparation .28 12.1 Dividers ..28 iii ISee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithoutlicense from IHS