ISO INTERNATIONAL STANDARD 13909-6 Second edition 2016-07-01 Hard coal and coke Mechanical sampling - Part 6: Coke Preparation of test samples Houille et coke - Echantillonnage mécanique - Partie 6: Coke Préparation des échantillons pour essai Reference number IS0 13909-6:2016(E) ISO International Organization for Standardization @ IS0 2016 HEJIANG INSTOFSTANDARDIZATIONC15956617 IS0 13909-6:2016(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 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 copyright@iso.org www.iso.org ensee-ZHEJIANG INST.OF STANDARDIzARoISQ16- All rights reserved Not for Resale, 2016/8/16 08:27:1 r networking permited without license from IHS IS0 13909-6:2016(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 General. .2 5.2 .2 Combinationofincrements 5.3 Combination of samples .2 6 Division. .3 6.1 General 6.2 Mechanical methods .9 6.2.1 General. 6.2.2 Mass of cut. .10 6.2.3 Intervalbetweencuts .11 6.2.4 Division of individual increments ..11 6.2.5 Minimum mass of divided increment .11 6.2.6 Division of samples. .12 6.3 Manual methods .12 6.3.1 General. 12 6.3.2 Rifflemethod ..12 6.3.3 Flattened-heap method ..13 6.3.4 Strip-mixing and splitting method ..15 7 Preparation of samples for specifictests .16 7.1 Types of test sample. .16 7.2 Preparation of samples for determining total moisture ..18 7.2.1 General. .18 7.2.2 Procedure. ..18 7.2.3 Wet samples ..18 7.2.4 Reduction of total moisture test sample ..19 7.2.5 Division .19 7.2.6 Determination of total moisture .19 7.2.7 Reserve sample .19 7.3 Preparation of sample for general analysis ..19 7.3.1 General. .19 7.3.2 Preparation errors. 19 7.3.3 Reduction .20 7.3.4 Division 20 7.3.5 Preparation errors. .20 7.4 Storage 20 7.5 Physical test sample 20 7.6 Samples for special properties. 20 8 Design of equipment for preparation .21 8.1 Dividers 21 8.2 Design of cutters for falling-stream dividers 21 8.2.1 General. 21 8.2.2 Cutter velocity 21 8.3 Crushers 22 8.3.1 General .22 8.3.2 Examples of crushers .22 iii Isee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithout license from IHS