ISO-20904-2006.pdf

Reference number ISO 20904:2006(E) © ISO 2006 INTERNATIONAL STANDARD ISO 20904 First edition 2006-10-01 Hard coal Sampling of slurries Houille Échantillonnage des schlamms Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. 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ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii © ISO 2006 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) © ISO 2006 All rights reserved iii Contents Page Foreword. v 1 Scope . 1 2 Normative references. 1 3 Definitions . 1 4 Principles of sampling slurries . 2 4.1 General. 2 4.2 Sampling errors 3 4.3 Sampling and overall variance 6 5 Sampling schemes . 7 6 Minimization of bias and unbiased increment mass. 13 6.1 Minimizing bias. 13 6.2 Volume of increment for falling stream samplers to avoid bias 14 6.3 Volume of increment for manual sampling to avoid bias. 14 7 Precision of sampling and determination of increment variance 15 7.1 Overall precision. 15 7.2 Primary increment variance. 15 7.3 Preparation and testing variance 16 8 Number of sub-lots and number of increments per sub-lot. 16 9 Minimum mass of solids in lot and sub-lot samples 17 9.1 General. 17 9.2 Minimum mass of solids in lot samples. 17 9.3 Minimum mass of solids in sub-lot samples . 17 9.4 Minimum mass of solids in lot and sub-lot samples after size reduction 17 10 Time-basis sampling 18 10.1 General. 18 10.2 Sampling interval 18 10.3 Cutters . 18 10.4 Taking of increments 18 10.5 Constitution of lot or sub-lot samples 19 10.6 Division of increments and sub-lot samples . 19 10.7 Division of lot samples. 19 10.8 Number of cuts for division. 19 11 Stratified random sampling within fixed time intervals 19 12 Mechanical sampling from moving streams 20 12.1 General. 20 12.2 Design of the sampling system. 20 12.3 Slurry sample cutters. 22 12.4 Mass of solids in increments. 23 12.5 Number of primary increments . 23 12.6 Routine checking 23 13 Manual sampling from moving streams. 23 13.1 General. 23 13.2 Choosing the sampling location. 23 13.3 Sampling implements. 24 13.4 Mass of solids in increments. 24 13.5 Number of primary increments . 24 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) iv © ISO 2006 All rights reserved 13.6 Sampling procedures .25 14 Sampling of stationary slurries .25 15 Sample preparation procedures25 15.1 General.25 15.2 Reduction mills .25 15.3 Sample division.25 15.4 Chemical analysis samples25 15.5 Physical test samples.26 16 Packing and marking of samples26 Annex A (informative) Examples of correct slurry devices27 Annex B (informative) Examples of incorrect slurry sampling devices30 Annex C (normative) Manual sampling implements.34 Bibliography .35 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) © ISO 2006 All rights reserved v Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 20904 was prepared by Technical Committee ISO/TC 27, Solid mineral fuels, Subcommittee SC 4, Sampling. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 20904:2006(E) © ISO 2006 All rights reserved 1 Hard coal Sampling of slurries 1 Scope This International Standard sets out the basic methods for sampling fine coal, coal rejects or tailings of nominal top size 20 Hz) ball mills shall not be used. The particle size of the output is influenced by the hardness of the coal, but the effect depends on the speed range. 15.3 Sample division After drying and particle size reduction (if necessary), division of lot and sub-lot samples shall be carried out in accordance with the requirements of ISO 13909-4 and the minimum sample mass requirements of Clause 9. Suitable dividers include rotary sample dividers and riffle dividers. 15.4 Chemical analysis samples Laboratory samples of typically 60 g to 300 g at 212 µm nominal top size are extracted from lot and sub-lot samples for chemical analysis depending on the analysis requirements. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) 26 © ISO 2006 All rights reserved 15.5 Physical test samples Laboratory samples for physical testing include samples for determination of size distribution and relative density. The samples should be prepared as specified in the applicable test procedure. 16 Packing and marking of samples Samples for further preparation and/or analysis should be placed in airtight containers, with relevant information shown on the label and on a card placed in the container. The following are examples of such information: a) identification of the lot, e.g. shift; b) identification of sampler; c) type, quality and nominal top size of the solids content of the slurry; d) time duration of the lot or sub-lot; e) sample number or portion of the lot or sub-lot the sample represents; f) place and date of sampling; g) method of sampling, e.g. mechanical or manual; h) any special purpose or test for which the sample is taken. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) © ISO 2006 All rights reserved 27 Annex A (informative) Examples of correct slurry devices Key 1 falling stream 2 stream 3 increment a Hose trajectory. Figure A.1 Illustration of a correctly designed hose-type slurry cutter6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) 28 © ISO 2006 All rights reserved Key 1 stream 2 rotating axis 3 increment a Cutter trajectory. Figure A.2 Correct layout of a circular path falling steam cutter, i.e. a vezin cutter6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) © ISO 2006 All rights reserved 29 Key 1 stream 2 increment Figure A.3 Illustration of a correctly designed falling steam slurry cutter6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) 30 © ISO 2006 All rights reserved Annex B (informative) Examples of incorrect slurry sampling devices a) Three examples of tubular probes that always introduce a delimitation error b) Homogenization of the stream with baffles positioned prior to a sampling probe (their effectiveness is questionable) Key 1 stream 2 sample 3 slot Figure B.1 In-steam probes Examples of incorrect sampling devices6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) © ISO 2006 All rights reserved 31 a) In-stream point sampling (always incorrect) b) By-line slurry sampling (always incorrect) Key 1 sample point 2 stream 3 increment 4 missing portion of the increment Figure B.2 Incorrect sample delimitation using an in-steam probe and by-line sampling6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) 32 © ISO 2006 All rights reserved Key 1 stream 2 sample NOTE Increment delimitation and extraction correctness are questionable for liquids and non-existent for slurries6. Figure B.3 Illustration of a sampling system using a header tank Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) © ISO 2006 All rights reserved 33 Key 1 on-stream idle, position 1 2 increment idle, position 2 3 falling stream 4 increment 5 missing portion of the increment Figure B.4 Flexible hose slurry sampler (always incorrect6) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) 34 © ISO 2006 All rights reserved Annex C (normative) Manual sampling implements a To exceed the depth of the falling stream. Figure C.1 Example of a manual sample cutter Figure C.2 Example of a ladle Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) © ISO 2006 All rights reserved 35 Bibliography 1 ISO 13909-2, Hard coal and coke Mechanical sampling Part 2: Coal Sampling from moving streams 2 ISO 13909-3, Hard coal and coke Mechanical sampling Part 3: Coal Sampling from stationary lots 3 ISO 13909-7, Hard coal and coke Mechanical sampling Part 7: Methods for determining the precision of sampling, sample preparation and testing 4 ISO 18283, Hard coal and coke Manual sampling 5 GY, P. 1982, Sampling of Particulate Materials Theory and Practice, 2nd Edition, Elsevier, Amsterdam 6 PITARD, F.F. 1993. Pierre Gys Sampling Theory and Sampling Practice, 2nd Edition, CRC Press, Boca Raton, USA 6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 20904:2006(E) ICS 73.040 Price based on 35 pages © ISO 2006 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Aramco HQ/9980755100 Not for Resale, 04/11/2007 03:49:39 MDTNo reproduction or networking permitted without licen