1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Copper, lead, zinc and nickel concentrates Guidelines for the inspection of mechanical sampling systemsBS ISO 11790:2017 ISO 2017Copper, lead, zinc and nickel concentrates Guidelines for the inspection of mechanical sam
2、pling systemsConcentrs de cuivre, de plomb, de zinc et de nickel Lignes directrices pour le contrle des systmes mcaniques dchantillonnageINTERNATIONAL STANDARDISO11790Second edition2017-06Reference numberISO 11790:2017(E)National forewordThis British Standard is the UK implementation of ISO 11790:20
3、17. It supersedes BS ISO 11790:2010, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee NFE/36, Copper lead and zinc ores and concentrates.A list of organizations represented on this committee can be obtained on request to its secretary.This publication d
4、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 94157 3ICS 73.060.99Compliance with a British Standard cannot confer immunity from le
5、gal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 11790:2017 ISO 2017Copper, lead, zinc and nickel concentrates Guidelines for t
6、he inspection of mechanical sampling systemsConcentrs de cuivre, de plomb, de zinc et de nickel Lignes directrices pour le contrle des systmes mcaniques dchantillonnageINTERNATIONAL STANDARDISO11790Second edition2017-06Reference numberISO 11790:2017(E)BS ISO 11790:2017ISO 11790:2017(E)ii ISO 2017 Al
7、l rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless 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 intern
8、et or an intranet, without prior written permission. Permission can be requested from either ISO at the address 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 47copyrig
9、htiso.orgwww.iso.orgBS ISO 11790:2017ISO 11790:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 General consideration 24.1 Precision . 24.2 Quality variation 24.3 Bias 24.4 Operation of the sampling system 25 Establishment of inspection system . 35.1 General . 35.2 A
10、udits 35.3 Mechanical inspections 45.4 Operational inspections 46 Procedures 46.1 Audits 46.2 Mechanical inspections 56.3 Operational inspections 66.4 Control charts 66.4.1 General 66.4.2 Sampling ratio 66.4.3 Extraction ratio . 76.5 Sampling records . 106.6 Operators inspection report . 10Annex A (
11、informative) Example of a sampling checklist for copper ore 11Annex B (informative) Example of sampling plant operators inspection report on a shift basis 14Annex C (informative) Example of sampling-system operations inspection summary 17 ISO 2017 All rights reserved iiiContents PageBS ISO 11790:201
12、7ISO 11790:2017(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 subj
13、ect 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 (IE
14、C) on all matters 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 n
15、oted. This document 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 identif
16、ying any or all such 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 conveni
17、ence of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Techni
18、cal Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 183, Copper, lead, zinc and nickel ores and concentrates.This second edition cancels and replaces the 2010 edition (ISO 11790:2010), of which it constitutes
19、a minor revision. The main change is the deletion of reference to ISO 20212, which has not yet been published.iv ISO 2017 All rights reservedBS ISO 11790:2017INTERNATIONAL STANDARD ISO 11790:2017(E)Copper, lead, zinc and nickel concentrates Guidelines for the inspection of mechanical sampling system
20、sWARNING This document may involve hazardous materials, operations and equipment. It is the responsibility of the user of this document to establish appropriate health and safety practices and determine the applicability of any other limitations prior to use.1 ScopeThis document sets out recommended
21、 practices for the inspection of mechanical sampling systems. It serves as a reference for conformance with applicable International Standards for copper, lead, zinc and nickel concentrates.This document covers general considerations, including precision, quality variation, bias, establishment of in
22、spection systems and inspection procedures.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edi
23、tion of the referenced document (including any amendments) applies.ISO 12743, Copper, lead, zinc and nickel concentrates Sampling procedures for determination of metal and moisture contentISO 12744, Copper, lead, zinc and nickel concentrates Experimental methods for checking the precision of samplin
24、gISO 13292, Copper, lead, zinc and nickel concentrates Experimental methods for checking the bias of sampling3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 12743, ISO 12744 and ISO 13292 and the following apply.ISO and IEC maintain terminological dat
25、abases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1auditcritical review of a mechanical sampling system, undertaken by a suitably qualified person n
26、ot directly involved in the operation of that system, which measures its compliance with stipulated operating specifications3.2mechanical inspectioncomparative record of observations and measurements of physical parameters against design criteria, and records of subsequent changes or improvements un
27、dertaken by a suitably qualified person not involved in the day-to-day operation of the system ISO 2017 All rights reserved 1BS ISO 11790:2017ISO 11790:2017(E)3.3operational inspectionrecord of observations and inspections undertaken by the system operator before, during and after the sampling of a
28、lotNote 1 to entry: The operator is the person taking the sample.4 General consideration4.1 PrecisionPrecision checks are recommended for each material type sampled by the system. If there is a significant change in material type or a new material type is introduced, a precision check should be carr
29、ied out. The test should outline the precision of sampling, preparation and analysis of each material type sampled by the system. These tests shall be in accordance with ISO 12744.4.2 Quality variationThe variance between increments, sb2, is a measure of the heterogeneity of the lot and is the varia
30、nce of the quality characteristics of increments taken from the lot. The value of sb2shall be measured experimentally for each material type for each handling plant under normal operating conditions, in accordance with ISO 12743.The entire material-handling system up to the mechanical sampling syste
31、m should be examined to determine whether any unloading, storage or reclaiming procedures produce a cyclical pattern which could cause the increment collection to get in phase with the sequence of material variability. Variations in the physical characteristics, such as particle-size distribution, s
32、urface moisture, extraneous matter and oversized material, could become cyclical and could even be in phase with mass-based or time-based increment collection. Where such cyclical variations occur in the material stream, the source of the variations should be investigated to determine the practicabi
33、lity of eliminating the variations. If there is no practical way to eliminate the variations, the interval between primary cuts should be adjusted so that the collection of increments is not in phase with the cyclic variation. Alternatively, stratified random sampling may be used.4.3 BiasAfter commi
34、ssioning and auditing of a new system or any major engineering modifications of an existing system, a bias test should be carried out in accordance with ISO 13292 to confirm the correct operation of the system. In multi-material-type facilities, it is recommended that the material having the highest
35、 variability be chosen for the bias test.It is recommended that, on a regular basis, further bias sample pairs be taken to confirm that the initial bias result is still relevant. If a significant change is made to the sampling system, or a new material having more difficult sampling characteristics
36、is introduced, the need for a new bias test should be considered.NOTE Provided that the mechanical sampling system satisfies the criteria outlined in ISO 12743, bias tests are not mandatory. However, quality-assurance principles at individual plants might require bias tests.4.4 Operation of the samp
37、ling systemThe mechanical sampling system should be started at some time in advance of the start of conveying the material to be sampled, so that any foreign substances (including water) are purged. Where hydraulic drives are used, sufficient time should be allowed for the hydraulic oil and the asso
38、ciated system to attain temperature equilibrium. It is recommended, particularly in multi-material-type sampling systems, that one primary cut be allowed to pass through the mechanical system as a conditioner before sampling commences.2 ISO 2017 All rights reservedBS ISO 11790:2017ISO 11790:2017(E)I
39、t is recommended that the operator review any sampling-system records maintained by the previous operator. These records should include such things as quantities of material handled and sampled, and notations as to system malfunctions, stoppages, blockages or other deficiencies. The operator should
40、use a suitable checklist, such as the example in Annex A. It is recommended that the operator complete all items on a suitable checklist designed for the particular system. For large multi-user systems, an operators inspection report, such as the example in Annex B, should be developed.Sufficient su
41、itably designed inspection points should be available to observe that the falling-stream and cross-belt cutters cut the full stream of material, and cutter apertures can be inspected for blockages and blinding.5 Establishment of inspection system5.1 GeneralTo ensure reliable operation, it is recomme
42、nded that a sampling checklist (Annex A) and operators sampling record (Annex B) be developed with input from the following sources:a) original design criteria and records of any subsequent changes or improvements;b) sampling equipment operating and maintenance manuals;c) management responsible for
43、the system;d) personnel operating or maintaining the system;e) for a new system, the designers and commissioning personnel.The general method for establishing these procedures is as follows.1) Refer to ISO 12743 to ascertain the correct sampling scheme.2) Refer to the equipment suppliers operating a
44、nd maintenance manuals to ascertain correct procedures for operation and intervals for routine maintenance. The manuals can provide useful information on the basis of the system design. Information such as conveyor rates, conveyor speeds and material parameters (particularly sizing and variability)
45、are significant data and should always be kept in mind when changes are contemplated.3) Examine existing sampling and maintenance records for an extended period. This information will provide guidance for operators to ensure that the required level of inspection and maintenance is carried out to ens
46、ure reliable operation, and will possibly alert operators to any inappropriate maintenance or modifications that may have been made to the equipment.4) Seek the personal experience of maintenance, operational and sampling personnel with respect to the sampling system. This information, together with
47、 that obtained from the above, will enable an appropriate operators manual, operators sampling record and system checklist to be prepared.5.2 AuditsA scheme for regular audits of the sampling system should be established. Reference should be made to the original operating parameters and equipment su
48、ppliers design data, as well as any records of any subsequent changes or improvements, in order to establish conformance with current applicable International Standards. Annex A provides a typical reference list.NOTE 1 Correct operation of all new systems needs to be confirmed by an audit following
49、the commissioning stage before being accepted as operational.NOTE 2 The design and operation of the system need to be confirmed by an audit prior to any bias test. ISO 2017 All rights reserved 3BS ISO 11790:2017ISO 11790:2017(E)5.3 Mechanical inspectionsA scheme for routine inspections of the sampling system by operators should be established, similar to the example in Annex A. The frequency and detail of inspections will be determined by factors such as, but not limited to, reliability of the system, handling charact
