GB 474-2008 PDF English
US$135.00 · In stock · Download in 9 secondsGB 474-2008: [GB/T 474-2008] Method for preparation of coal sample Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 474: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 474-2008 | English | 135 |
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[GB/T 474-2008] Method for preparation of coal sample
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| GB 474-1996 | English | 319 |
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Preparation of coal sample
| Obsolete |
| GB 474-1983 | English | RFQ |
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Methods for the preparation of coal sample
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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/GB474-2008
D 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.
Drafting organization of this standard. Coal Analysis and Test Laboratory of China Coal
Research Institute (National Quality Supervision and Inspection Center for Coal).
Chief drafting staff of this standard. Han Liting, Pi Zhongyuan, Duan Yunlong.
The previous editions replaced by this standard are.
——GB 474-1964; GB 474-1975; GB 474-1983; GB 474-1996.
1NATIONAL STANDARD
OF THE PEOPLE'S REPUBLIC OF CHINA
Method for Preparation of Coal Sample
1 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)
3 Terms and Definitions
Terms and definitions specified in GB 475 and those below are applicable to this
standard.
Method of sample division in which the mass retained is predetermined and independent
of the mass of the divided sample.
4 General and Precision of Sample Preparation
According to formulae given in GB 475, and in continuous sampling, the fiducial
probability, at 95%, of the precision estimated (absolute) value PL for the determination
results of coal in one lot is shown in Formula (1).
5 Apparatus
The sample preparation room shall have cement floor. And the cement floor in the area
for coning-and-mixing division shall also be paved with the steel plate with the thickness
greater than 6mm. The room storing coal sample shall be free from heat source, highlighting
or any chemicals.
6 Constitution of Sample
Individual increments are usually constituted to form a sample. a single sample may be
constituted by combination of increments taken from a complete sampling unit or by
constituting increments taken from individual parts of a sampling unit (see Figure 1). Under
some circumstance, e.g. size analysis and bias test, the sample consists of one single
increment.
7 Division
Division is the most important procedure for sample preparation, and the purpose is to
reduce the sample amount. Division can be carried out mechanically or manually. Wherever
possible, mechanical methods are preferred to manual methods to minimize human error.
This method is only applied to extract total moisture sample.
As shown in Figure 8, the sample shall be spread into circular shape with the thickness
not greater than 3 times the nominal top size after being blended with coning and quartering
method, then nine increments shall be taken from nine points shown in Figure 8 with the
sampling scoop and operation similar to those used in flattened-heap method (7.4.2) so as to
constitute into a total moisture sample.
8 Reduction
The discharge size of the crusher depends on the type of crusher, the dimension of
crushing opening (jaw crusher and roll crusher) or the speed (hammer crusher and ball
crusher).
9 Mixing
Mixing is carried out to make the coal sample uniform as much as possible. In theory,
thorough mixing of a sample prior to its division reduces errors due to sample preparation In
practice, this is not entirely true. For example, where the mechanical divider is adopted,
mixing prior to division will not only be unnecessary to ensure the division precision but also
result in loss of moisture.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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