BS-ISO-20904-2006.pdf
BRITISH STANDARD BS ISO 20904:2006 Hard coal Sampling of slurries ICS 73.040 ? Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20904:2006 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2006 © BSI 2006 ISBN 0 580 49617 1 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 20904:2006. The UK participation in its preparation was entrusted to Technical Committee PTI/16, Solid mineral fuels. A list of organizations represented on PTI/16 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Reference number ISO 20904:2006(E) INTERNATIONAL STANDARD ISO 20904 First edition 2006-10-01 Hard coal Sampling of slurries Houille Échantillonnage des schlamms BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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. BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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. BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 26 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. BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 28 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 29 Key 1 stream 2 increment Figure A.3 Illustration of a correctly designed falling steam slurry cutter6 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 30 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 32 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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) BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 34 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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 BS ISO 20904:2006 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 20904:2006 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: +44 (0)20 8996 9000. Fax: +44 (0)20 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: +44 (0)20 8996 9001. Fax: +44 (0)20 8996 7001. Email: ordersbsi-global.com. Standards are also available from the BSI website at http:/www.bsi-global.com. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: +44 (0)20 8996 7111. Fax: +44 (0)20 8996 7048. Email: infobsi-global.com. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: +44 (0)20 8996 7002. Fax: +44 (0)20 8996 7001. Email: membershipbsi-global.com. Information regarding online access to British Standards via British Standards Online can be found at http:/www.bsi-global.com/bsonline. Further information about BSI is available on the BSI website at http:/www.bsi-global.com. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. Details and advice can be obtained from the Copyright & Licensing Manager. Tel: +44 (0)20 8996 7070. Fax: +44 (0)20 8996 7553. Email: copyrightbsi-global.com. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 06:46:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
