ISO INTERNATIONAL STANDARD 18283 Second edition 2022-03 Coal and coke Manual sampling Houille et coke - Echantillonnage manuel Reference number IS0 18283:2022(E) ISO @IS02022 IS0 18283:2022(E) COPYRIGHT PROTECTED DOCUMENT IS02022 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may the internet or an intranet, withoutpriorwrittenpermission.Permission can be requested from eitherIso at the addressbelow or Iso's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214Vernier,Geneva Phone: +41 22 749 01 11 Email: [email protected] Website: www.iso.org PublishedinSwitzerland i @ IS0 2022 - All rights reserved IS0 18283:2022(E) Contents Page Foreword .V Introduction. ..vii 1 Scope. .1 2 Normative references .1 3 Terms and definitions .1 4 Establishing a sampling scheme. .4 4.1 General 4 4.1.1 Sampling .4 4.1.2 Sampling scheme. 5 4.1.3 Parameters 5 4.1.4 Sampling methods. .5 4.2 Design of the sampling scheme .6 4.2.1 General 6 4.2.2 Coal or coke to be sampled and considerations for sampling 6 4.2.3 Division of lots. .6 4.2.4 Precision of results. .7 4.2.5 Bias of results. 7 4.2.6 Requirements for test samples 7 4.3 Precision of sampling .8 4.3.1 General 8 4.3.2 Precision and total variance .8 4.3.3 Primary increment variance 9 4.3.4 Sub-lot variance 10 4.3.5 Preparation and testing variance 10 4.3.6 Number of sub-lots and number of increments per sub-lot .11 4.3.7 Minimum mass of samples for general analysis and determination of total moisturecontent. 12 4.4 Checking the overall precision for the lot by calculation and selection of sampling scheme.. 15 4.5 Determination of acquired precision by replicate sampling 15 4.5.1 General 15 4.5.2 Method and calculation. .15 4.5.3 Precision obtained using normal sampling scheme 16 4.6 Size analysis .16 5 Methods of sampling .17 5.1 General 17 5.2 Sampling by time interval (time-basis sampling) 17 5.3 Sampling by mass interval (mass-basis sampling) 18 5.4 Stratified random sampling. 18 5.4.1 General 18 5.4.2 Stratified random sampling by time interval 18 5.4.3 Stratified random sampling by mass interval 18 5.5 Extracting the increment. 18 5.6 Coal or coke in motion 19 5.6.1 General 19 5.6.2 Stopped belt 19 5.6.3 Falling stream 20 5.6.4 Moving belt. 20 5.6.5 Stockpiles (building/reclaiming) 21 5.6.6 Grabs/front-end loaders 21 5.6.7 Barges/trucks/railcars/wagons (loading/unloading) 22 5.7 Moisture/common sample. 22 @ IS0 2022 - All rights reserved ii IS0 18283:2022(E) 5.8 Different coals or cokes .23 5.9 Randomselectionofincrements .23 6 Sampling equipment .24 6.1 General .24 6.2 Examples. .25 6.2.1 Ladles. .25 6.2.2 Shovels. 25 6.2.3 Scoops. 25 6.2.4 Probes 25 6.2.5 Manual cutter .26 6.2.6 Stopped-belt sampling frame .26 7 Handling and storage of samples .28 7.1 Sample size. .28 7.2 Time. .28 7.3 Divided sample 29 7.4 Containers .29 7.5 Moisture loss/breakage or degradation .30 7.6 Identification/labelling .31 8 Sample preparation .31 8.1 General. .31 8.2 Constitution of a sample .31 8.3 Division. .32 8.3.1 General .32 8.3.2 Mechanical methods .33 8.3.3 Manual methods .36 8.4 Reduction. .40 8.4.1 General .40 8.4.2 Reduction mills. .40 8.5 Mixing 41 8.6 Air-drying of coal. .41 8.7 Coal Preparation of test samples ..42 8.7.1 Types of test samples. .42 8.7.2 Preparation of samples for determination of total moisture content ..42 8.7.3 Preparation of samples for general analysis ..43 8.7.4 Common samples. .45 8.7.5 Preparation of size-analysis sample .47 8.7.6 Preparation of samples for other tests ..48 8.7.7 Reserve sample .49 8.8 Coke Preparation of test samples .49 8.8.1 Types of test samples.. .49 8.8.2 Preparation of coke samples for determination of total moisture content .50 8.8.3 Preparation of samples for general analysis .52 8.8.4 Storage .53 8.8.5 Physical test sample .53 8.8.6 Samples for special properties .53 8.8.7 Reserve sample .53 Packing and marking of sa