ISO INTERNATIONAL STANDARD 13909-5 Second edition 2016-07-01 Hard coal and coke Mechanical sampling - Part 5: Coke Sampling from moving streams Houille et coke - Echantillonnage mécanique - Partie 5: Coke — Echantillonnage en continu Reference number IS0 13909-5:2016(E) ISO International Organization for Standardization e=ZHEJIANG INST OF STANDARDIZATION C1 5956617 @IS02016 mitted without license from IHS IS0 13909-5:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2016, Published in Switzerland 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 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Internationai ibrg DrganizationforStandardization Licensee-ZHEJIANG INST OF STANDARDIZzRoISQ6- All rights reserved Not for Resale, 2016/8/16 08:26:58 networking permited withoutlicense from IHS IS0 13909-5:2016(E) Contents Page Foreword ..V 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 4.2.1 Material to be sampled 2 4.2.2 Parameters to be determined on samples .2 4.2.3 Division of lots 2 4.2.4 Basis of sampling .2 4.2.5 Precision of sampling 3 4.2.6 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. ..5 4.3.4 Number of sub-lots and number of increments in each sub-lot 4.4 Minimum mass of sample .8 4.5 Mass of primary increment 4.6 Size analysis. ..10 5 Methods of sampling .10 5.1 General .10 5.2 Time-basis sampling .11 5.2.1 Method of taking primary increments ..11 5.2.2 Sampling interval ..11 5.2.3 Mass of increment. .11 5.3 Stratified random sampling. ..11 5.3.1 General .11 5.3.2 Time-basis stratified random sampling ..12 5.4 Reference sampling .12 6 Design of mechanical samplers ..12 6.1 Safety .12 6.2 Sampling System. .12 6.2.1 General ..12 6.2.2 Checking for precision and bias. ..13 6.2.3 Operation of sampler. ..13 6.3 Location of sampling equipment .13 6.4 General requirements for designing mechanical samplers .13 6.5 Design of falling-stream-type samplers ..14 6.5.1 General ..14 6.5.2 Cutter velocity ..16 6.6 Cross-belt-type primary samplers .16 6.6.1 Operation. ..16 6.6.2 Design of cross-belt samplers. ..17 6.6.3 Maintenance of sampling equipment ..18 7 Handling and storage of samples ..19 8 Sample preparation. .20 9 Minimization of bias ..20 9.1 General .20 9.2 Spacing of increments 20 ntemaional oganzation@S26All rights reserved iii icensee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vided by IHS under license with ISO without license from IHS