ISO INTERNATIONAL STANDARD 13909-3 Second edition 2016-07-01 Hard coal and coke Mechanical sampling - Part 3: Coal Sampling from stationary lots Houille et coke - Echantillonnage mécanique - Partie 3: Charbon - Echantillonnage sur lots statiques Reference number IS0 13909-3:2016(E) ISO International Organization for Standardization @ IS0 2016 =ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS underI ed without license from IHS IS0 13909-3:2016(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. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel.+41 22 749 0111 Fax+41227490947 [email protected] www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZoISQ s.6 - All rights reserved I by IHS unde Not for Resale, 2016/8/16 08:26:30 etworking permitted without license from IHS IS0 13909-3:2016(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Terms and definitions 4 Establishing a sampling scheme ..1 4.1 General .1 4.2 Design of the sampling scheme .2 4.2.1 Material to be sampled 2 4.2.2 Division of lots .2 4.2.3 Precision of sampling .2 4.2.4 Bias of sampling. .3 4.3 Precision of results. .3 4.3.1 Precision and total variance. .3 4.3.2 Primary increment variance. .4 4.3.3 Preparation and testing variance .4 4.3.4 Number of sub-lots and number of increments per sub-lot 4.4 Minimum mass of sample ..6 4.5 Mass of primary increment. 4.6 Size analysis. .9 5 Methods of sampling from wagons, barges and ships .10 5.1 General 10 5.2 Number of increments and sub-lots. .10 5.2.1 General analysis and moisture samples. .10 5.2.2 Common sample .10 5.3 Taking the increments .11 5.4 Distribution of increments .11 5.4.1 Wagons .11 5.4.2 Barges. ..11 5.4.3 Ships. .11 5.4.4 Random selection of increments .11 6 Methods of sampling from stockpiles ..12 7 Sampling equipment - mechanical auger ..13 8 Handling and storage of samples ..15 9 Sample preparation ..16 10 Minimization of bias ..16 10.1 Causes of bias ..16 10.2 Checking for precision and bias .16 11 Verification ..17 Bibliography ..18 ntemaonalganizatinAll rights reserved iii ee=ZHEJIANG INSTOFSTANDARDIZATION C15956617 ed withoutlicensefrom IHS Not for Resale, 2016/8/16 08:26:30