1、BS ISO 13909-5:2016Hard coal and coke Mechanical samplingPart 5: Coke Sampling from movingstreamsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 13909-5:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 13909-5:2016.It
2、 supersedes BS ISO 13909-5:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PTI/16, Solid mineral fuels.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all
3、 the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 83178 2ICS 73.040; 75.160.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This Brit
4、ish Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2016.Amendments issued since publicationDate Text affectedBS ISO 13909-5:2016 ISO 2016Hard coal and coke Mechanical sampling Part 5: Coke Sampling from moving streamsHouille et coke chantillonnage
5、 mcanique Partie 5: Coke chantillonnage en continuINTERNATIONAL STANDARDISO13909-5Second edition2016-07-01Reference numberISO 13909-5:2016(E)BS ISO 13909-5:2016ISO 13909-5:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless
6、 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 add
7、ress below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 13909-5:2016ISO 13909-5:2016(E)Foreword v1 Scope . 12 Normative references 13 Te
8、rms and definitions . 14 Establishing a sampling scheme 14.1 General . 14.2 Design of the sampling scheme 24.2.1 Material to be sampled . 24.2.2 Parameters to be determined on samples . 24.2.3 Division of lots . 24.2.4 Basis of sampling . 24.2.5 Precision of sampling . 34.2.6 Bias of sampling 34.3 P
9、recision of results 34.3.1 Precision and total variance . 34.3.2 Primary increment variance 44.3.3 Preparation and testing variance 54.3.4 Number of sub-lots and number of increments in each sub-lot . 54.4 Minimum mass of sample 84.5 Mass of primary increment 94.6 Size analysis 105 Methods of sampli
10、ng .105.1 General 105.2 Time-basis sampling . 115.2.1 Method of taking primary increments .115.2.2 Sampling interval .115.2.3 Mass of increment 115.3 Stratified random sampling 115.3.1 General. 115.3.2 Time-basis stratified random sampling 125.4 Reference sampling 126 Design of mechanical samplers 1
11、26.1 Safety 126.2 Sampling System. 126.2.1 General. 126.2.2 Checking for precision and bias . 136.2.3 Operation of sampler 136.3 Location of sampling equipment 136.4 General requirements for designing mechanical samplers .136.5 Design of falling-stream-type samplers . 146.5.1 General. 146.5.2 Cutter
12、 velocity .166.6 Cross-belt-type primary samplers 166.6.1 Operation . 166.6.2 Design of cross-belt samplers 176.6.3 Maintenance of sampling equipment 187 Handling and storage of samples .198 Sample preparation 209 Minimization of bias 209.1 General 209.2 Spacing of increments 20 ISO 2016 All rights
13、reserved iiiContents PageBS ISO 13909-5:2016ISO 13909-5:2016(E)9.3 Incorrectly extracted increments . 209.4 Preservation of integrity of sample 209.4.1 General. 209.4.2 Precautions to reduce bias . 2110 Verification 21Bibliography .22iv ISO 2016 All rights reservedBS ISO 13909-5:2016ISO 13909-5:2016
14、(E)ForewordISO (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
15、 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 matte
16、rs of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This docu
17、ment was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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 su
18、ch patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and doe
19、s not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary informat
20、ion .The committee responsible for this document is ISO/TC 27, Solid mineral fuels, Subcommittee SC 4, Sampling.This second edition cancels and replaces the first edition (ISO 13909-5:2001), which has been technically revised.ISO 13909 consists of the following parts, under the general title Hard co
21、al and coke Mechanical sampling: Part 1: General introduction Part 2: Coal Sampling from moving streams Part 3: Coal Sampling from stationary lots Part 4: Coal Preparation of test samples Part 5: Coke Sampling from moving streams Part 6: Coke Preparation of test samples Part 7: Methods for determini
22、ng the precision of sampling, sample preparation and testing Part 8: Methods of testing for bias ISO 2016 All rights reserved vBS ISO 13909-5:2016BS ISO 13909-5:2016Hard coal and coke Mechanical sampling Part 5: Coke Sampling from moving streams1 ScopeThis part of ISO 13909 specifies procedures and
23、requirements for the design and establishment of sampling schemes for the mechanical sampling of coke from moving streams and the methods of sampling used.The diversity of types of equipment for sampling and the conditions under which mechanical sampling is performed make it inappropriate to specify
24、 standard designs for samplers which will be applicable to all situations.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated refer
25、ences, the latest edition of the referenced document (including any amendments) applies.ISO 13909-1:2016, Hard coal and coke Mechanical sampling Part 1: General introductionISO 13909-6, Hard coal and coke Mechanical sampling Part 6: Coke Preparation of test samplesISO 13909-7, Hard coal and coke Mec
26、hanical sampling Part 7: Methods for determining the precision of sampling, sample preparation and testingISO 13909-8, Hard coal and coke Mechanical sampling Part 8: Methods of testing for biasISO 21398, Hard coal and coke Guidance to the inspection of mechanical sampling systems3 Terms and definiti
27、onsFor the purposes of this part of ISO 13909, the terms and definitions given in ISO 13909-1 apply.4 Establishing a sampling scheme4.1 GeneralThe general procedure for establishing a sampling scheme is as follows:a) define the quality parameters to be determined and the types of samples required;b)
28、 define the lot;c) define the precision required;d) determine the method of combining the increments into a sample, or number of sub-lot samples, and the method of sample preparation (see ISO 13909-6);INTERNATIONAL STANDARD ISO 13909-5:2016(E) ISO 2016 All rights reserved 1BS ISO 13909-5:2016ISO 139
29、09-5:2016(E)e) determine or assume the variability of the coke (see 4.3.2) and the variance of preparation and testing (see 4.3.3). Methods for determining variability and the variance of preparation and testing are given in ISO 13909-7;f) establish the number of sub-lots and the number of increment
30、s per sub-lot required to attain the desired precision (see 4.3.4);g) define the sampling interval (see Clause 5);h) ascertain the nominal top size of the coke for the purpose of determining the minimum mass of sample (see 4.4 and Table 1);NOTE The nominal top size may initially be ascertained by co
31、nsulting the consignment details, or by visual estimation, and may be verified, if necessary, by preliminary test work.i) determine the minimum average increment mass (see 4.5).4.2 Design of the sampling scheme4.2.1 Material to be sampledThe first stage in the design of the scheme is to identify the
32、 cokes to be sampled. Samples may be required for technical evaluation, process control, quality control, and for commercial reasons by both the producer and the customer. It is essential to ascertain exactly at what stage in the coke-handling process the sample is required and, as far as practicabl
33、e, design the scheme accordingly.4.2.2 Parameters to be determined on samplesThe samples for moisture and physical tests may be collected separately or as one sample, which is then divided. In this part of ISO 13909, a sample which is collected for the determination of moisture (and possibly also fo
34、r general analysis) is referred to as the moisture sample; a sample which is collected for physical tests only is referred to as the physical sample. If a sample is used for the determination of moisture and for physical tests, it is referred to as a common sample.In mechanical sampling of coke, the
35、 only sample which can, in certain circumstances (see 4.2.6), be processed automatically beyond the divided-increment stage is the moisture sample.In order to achieve the desired precision, it may be necessary to take different numbers of increments for the moisture and physical samples. Where a com
36、mon sample is taken, the greater number of increments shall be used.4.2.3 Division of lotsA lot may be sampled as a whole or as a series of sub-lots, e.g. coke despatched or delivered over a period of time, a ship load, a train load, a wagon load, or coke produced in a certain period, e.g. a shift.I
37、t may be necessary to divide a lot into a number of sub-lots in order to improve the precision of the results.For lots sampled over long periods, it may be expedient to divide the lot into a series of sub-lots, obtaining a sample for each.4.2.4 Basis of samplingSampling may be carried out on either
38、a time-basis or a mass-basis.In time-basis sampling, increments are taken at fixed time intervals with an increment mass, collected with a fixed speed cutter, which is proportional to the flow rate at the time of extraction.2 ISO 2016 All rights reservedBS ISO 13909-5:2016ISO 13909-5:2016(E)In mass-
39、basis sampling, increments are taken at fixed mass intervals, using a belt weigher/mass integrator, and fixed mass increments are extracted using a variable speed cutter or sample preparation system which produces a fixed mass divided increment.The conditions under which mass-basis sampling may seem
40、 to offer the advantage of consistent increment mass, for example highly variable flow rates, are those in which it is most difficult to implement in practice.Time-basis sampling is by far the simplest to implement and is the basis of this part of ISO 13909.4.2.5 Precision of samplingThe required pr
41、ecision for a lot for each parameter to be measured shall be decided. The number of sub-lots and minimum number of increments per sub-lot collected shall then be determined as described in 4.3.4, and the average mass of primary increments shall be determined as described in 4.5.For single lots, the
42、quality variation shall be assumed as the worst case (see 4.3.2). The precision of sampling achieved may be measured using the procedure of replicate sampling (see ISO 13909-7).At the start of regular sampling of unknown cokes, the worst-case quality variation shall be assumed. When sampling is in o
43、peration, a check shall be carried out to confirm that the desired precision has been achieved using the procedure of duplicate sampling as described in ISO 13909-7.If any subsequent change in precision is required, the number of sub-lots and increments shall be changed as determined in 4.3.4 and th
44、e precision attained shall be rechecked. The precision shall also be checked if there is any reason to suppose that the variability of the coke being sampled has increased. The number of increments determined in 4.3.4 applies to the precision of the result when the sampling errors are large relative
45、 to the testing errors, e.g. moisture content. However, in some tests, e.g. Micum Index, the testing errors are themselves large. In this case, it may be necessary to prepare two or more test portions from the same sample (see 4.3.4.3) and use the mean of the determinations to give a better precisio
46、n.4.2.6 Bias of samplingIt is of particular importance in sampling to ensure, as far as possible, that the parameter to be measured is not altered by the sampling and sample preparation process or by subsequent storage prior to testing. For example, care shall be taken to avoid breakage of coke inte
47、nded for physical testing and loss of moisture from the moisture sample during storage. This may require, in some circumstances, a limit on the minimum mass of primary increment (see 4.5 and Clause 8).When collecting samples for moisture determination from lots over an extended period, it may be nec
48、essary to limit the standing time of samples by dividing the lot into a number of sub-lots (see 4.3.4).The use of on-line crushing and division of the moisture sample for moisture determination should be treated with caution because of the risk of bias caused by loss of moisture in the processing (s
49、ee 6.2.2). In particular, the crushing of hot coke is not recommended. If the bias is unacceptable, the sample shall be left in the uncrushed state and the sample preparation carried out by manual methods. It should be accepted, however, that some bias is inevitable, whether due to breakage or loss of moisture from hot coke. The object, therefore, shall be to restrict such degradation or moisture loss to a minimum.When a coke-sampling scheme is implemented, it shall be checked for bias in accordance w
