GB 474-2008 English PDF
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GB 474: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB 474-2008 | 135 | Add to Cart | Auto, 9 seconds. | [GB/T 474-2008] Method for preparation of coal sample | Valid |
| GB 474-1996 | 319 | Add to Cart | 3 days | Preparation of coal sample | Obsolete |
| GB 474-1983 | RFQ | ASK | 3 days | Methods for the preparation of coal sample | Obsolete |
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GB 474-2008: [GB/T 474-2008] Method for preparation of coal sample
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB474-2008D 21 NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA GB474-2008 Replacing GB 474-1996 Method for Preparation of Coal Sample (ISO 18283.2006, Hard Coal and Coke-Manual Sampling, MOD) Issued on: DECEMBER 04, 2008 Implemented on: MAY 01, 2009 Jointly Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. GB
Table of Contents
Foreword... I 1 Scope... 1 2 Normative References... 1 3 Terms and Definitions... 1 4 General and Precision of Sample Preparation... 2 4.1 General of Sample Preparation... 2 4.2 Sample Preparation Precision... 3 5 Apparatus... 3 6 Constitution of Sample... 4 7 Division... 5 7.1 General... 5 7.2 Minimum Mass of the Divided Sample... 5 7.3 Mechanical Methods... 6 7.4 Manual Methods... 12 8 Reduction... 15 9 Mixing... 16 10 Air-drying... 16 11 Preparation of Various Coal Samples... 17 11.1 Types of Coal Sample... 17 11.2 Moisture Sample of Coal... 17 11.3 General-analysis Test Sample of Coal... 19 11.4 Common Sample of Coal... 21 11.5 Size Analysis Sample of Coal... 22 11.6 Coal Samples for other Tests... 22 12 Reserve Sample... 23 Appendix A (Informative) Comparison of Chapter and Article Numbers between this Standard and ISO 18283.2006(E)... 24 Appendix B (Informative) Technical Differences between this Standard and ISO 18283. 2006(E) and the Reasons... 26 Appendix C (Normative) Verification for Precision of Sample Preparation and Assays and Bias Test... 28 Appendix D (Normative) Method for Flotation of Coal Sample... 30 IForeword Chapter 4, Chapter 6, Chapter 7, Chapter 10 and Chapter 11 of this standard are mandatory and the others are recommendatory. This standard is modified in relation to ISO 18283.2006(E) "Hard Coal and Coke-Manual Sampling" (English version). This standard was re-drafted mainly according to ISO 18283.2006(E). The list for comparison of chapter and article numbers between this standard and ISO 18283.2006(E) is given in Appendix A. In consideration of the national condition of China, this standard is subjected to some modifications in the adoption of ISO 18283.2006(E). Technical differences have already been incorporated into the text and marked with perpendicular single line at the margin of relevant clauses. The list for these technical differences and their reasons is given in Appendix B for reference. For convenient application, some editorial changes are made to ISO 18283.2006(E) as follows. ——"This international standard" is replaced by "this standard"; ——Introduction of ISO 18283.2006(E) is modified; ——Comma ",", which serves as decimal point in ISO standard, is replaced by ".". This standard replaces GB 474-1996 "Preparation of Coal Sample". Compared with GB 474-1996, main changes of this standard are as follows. ——Contents on general and precision of sample preparation (Chapter 3 of the original edition and Chapter 4 of this edition) are improved; ——Contents on sample constitution are added (Chapter 6 of this edition); ——"Coal sample greater than 25mm (particle size) shall not be divided before being crushed" is modified into "division may be carried out at any stage and the minimum mass of divided sample shall meet those specified in 7.2" (6.3 of the original edition and 7.1 of this edition); ——The minimum mass of divided sample at each particle size level is modified (6.7 of the original edition and 7.2 of this edition); ——Contents on mechanical dividing method and mechanical divider are added (7.3 of this edition); ——Two manual dividing methods are added (7.4.2 and 7.4.3 of this edition); ——Detailed explanations and specifications on division, reduction, mixing and air-drying etc. are added (Chapter 7, Chapter 8, Chapter 9 and Chapter 10 of this edition); ——Preparation methods of various coal samples are added (Chapter 11 of this edition); ——Operating requirements for extracting moisture sample of coal from common sample of coal with the nine-point picking out method are defined (11.4.1 of this edition). Appendix A and Appendix B of this standard are informative, Appendix C and Appendix D of this standard are normative. This national standard is proposed by the China National Coal Association. This standard is under the jurisdiction of the National Technical Committee on Coal Chemical Industry of Standardization Administration of China. 1NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA Method for Preparation of Coal Sample1 Scope
This standard specifies terms and definitions, sample constitution, reduction, mixing, division and air-drying for coal sample preparation, the preparation of various coal samples and reserve sample. This standard is applicable to lignite, bitumite and hard coal.2 Normative References
The following documents contain provisions which, through reference in this standard, constitute provisions of this standard. For dated references, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, its latest editions apply. GB/T 211 "Determination of Total Moisture in Coal" (GB/T 211-2007, ISO 589-2003, NEQ) GB/T 217 "Determination of True Relative Density of Coal" GB 475 "Method for Manual Sampling of Commercial Coal" (GB 475-2008, ISO 18283. 2006 "Hard Coal and Coke-Manual Sampling", MOD) GB/T 19494.3 "Mechanical Sampling of Coal-Part 3.Determination of Precision and Bias Test" (GB/T 19494.3-2004, ISO 13909-7.2001, ISO 13909-8.2001, NEQ)3 Terms and Definitions
Terms and definitions specified in GB 475 and those below are applicable to this standard. 3.1 Sample preparation ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
