ASTM-D7430 2008

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D7430-08 Standard Practice for Mechanical Sampling of Coal

Published By	Publication Date	Number of Pages
ASTM	2008	40

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Categories: 75.160.10 - Solid fuels, ASTM

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Description

1.1 This practice is divided into 4 parts. These 4 parts represent the previous standards D 7256/D 7256M , D 4916 , D 4702 , and D 6518 . These 4 standards are the 4 that govern the mechanical sampling of coal and have been combined into one document for the ease of reference of the users of these standards.

1.2 Part A Mechanical Collection and Within-System Preparation of a Gross Sample of Coal from Moving Streams Covers procedures for the mechanical collection of a sample under Classification I-B-1 and I-B-2 (Practice D 2234/D 2234M ) and the within-system preparation (reduction and division) of gross samples utilizing various components of the mechanical sampling system.

1.2.1 Part A describes mechanical sampling procedures for coals (1) by size and condition of preparation (for example, mechanically cleaned coal or raw coal), and (2) by sampling characteristics.

1.3 Part B Mechanical Auger Sampling Describes procedures for the collection of an increment, partial sample, or gross sample of material using mechanical augers. Reduction and division of the material by mechanical equipment at the auger is also covered. Further manual or mechanical reduction or division of the material elsewhere shall be performed in accordance with Practice D 2013 .

1.4 Part C Quality Management of Mechanical Coal Sampling Systems Is applicable to the quality management of cross-belt, falling stream, and auger sampling systems.

1.4.1 Spacing of increments pertains to the kind of interval between increments. Intervals can be defined in quantitative terms, such as units of time or mass, or in terms of position over the lot.

1.4.2 Spacing of Increments for Cross-Belt and Falling Stream Samplers Cross-belt and falling stream type mechanical sampling systems take increments based on time, either at fixed time intervals or at random times during a fixed time strata. Some falling stream samplers can take increments based on equal mass of coal sampled as determined by scales. The sections of this practice that pertain to cross-belt and falling stream samplers describe procedures for only time-based sampling systems. This time-based inspection guideline will satisfy most criteria for mass-based or combination mass-based and time-based sampling systems. If there are items that are not covered, the inspector should refer to the manufacturer’s literature.

1.4.3 Spacing of Increments for Auger Sampling The spacing of increments collected by auger sampling systems is defined in terms of position over the lot.

1.4.4 It is essential that the inspector have the documentation listed in Section 2 of this practice when conducting an inspection.

1.5 Part D Bias Testing of a Mechanical Coal Sampling System Presents sample collection and statistical evaluation procedures for testing mechanical sampling systems, subsystems, and individual system components for bias. It is the responsibility of the user of this practice to select the appropriate procedure for a specific sampling situation.

1.5.1 Part D does not purport to define an absolute bias. Bias defined by this practice is the difference between the population mean of the mechanical sampler test results and the accepted reference value.

1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text the inch-pound units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, use each system independently of the other. Combining values from the two systems may result in nonconformance with the standard.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement, see section 16.1.

PDF Catalog

PDF Pages	PDF Title
1	Scope
2	Referenced Documents Terminology
4	Summary of Practices Significance and Use Increment Collection Classification Organization and Planning of Sampling Operations TABLE 1
6	Procedures
7	Maintenance of Mechanical Sampling Equipment Precision and Bias
8	FIG. 1
9	Summary of Practices Significance and Use Organization and Planning of Sampling Operations
11	Precision and Bias
12	Significance and Use Hazards Assessing the Organization and Planning of Sampling Operations General Observations of Coal Stream Variability as Related to Primary Increment Collection by Falling-Stream and Cross-Belt Samplers General Observations of Auger Placement
13	Inspection of the Primary Sampler in Time-Based Cross-Belt or Falling-Stream Sampling Systems Inspection of Augers Criteria for Secondary Sampler Operation
14	Criteria for Tertiary or Final Sampler Operation Cautions for Collecting Final Sample General Considerations to be Observed by the Inspector
15	Summary of Practices Significance and Use Apparatus Description of Test Procedures
17	Organization and Planning
19	Keywords
20	A1. COLLECTION OF REFERENCE SAMPLES (SECTION D – BIAS TESTING) A1.1 Reference Samples TABLE A1.1
21	A1.2 Surrogate Samples FIG. A1.1
22	A2. STATISTICAL PROCEDURES (SECTION D – BIAS TESTING) A2.1 Nonparametric Statistical Procedure TABLE A2.1 TABLE A2.2 TABLE A2.3
23	TABLE A2.4 TABLE A2.5 TABLE A2.6
24	A2.2 Interpretation of Nonparametric Results and Adequacy of Data TABLE A2.7 TABLE A2.8
25	TABLE A2.9 TABLE A2.10 TABLE A2.11
26	A2.3 Parametric Statistical Procedures
28	TABLE A2.12
29	A2.4 Combined-Variance for Intraphase Test
31	A3. SELECTION OF TEST BATCH SIZE (SECTION D – BIAS TESTING) A3.1 A3.2 A3.3 A3.4
32	A4. BIAS TESTING A MECHANICAL SAMPLING SYSTEM TABLE A4.1
33	A5. TEST METHOD FOR ESTIMATING THE OVERALL VARIANCE FOR INCREMENTS A5.1 Scope A5.2 Procedure A5.3 Calculation TABLE A5.1
34	TABLE A5.2
35	X1. TYPICAL MECHANICAL COAL SAMPLER CHECKLIST (SECTION A – MECHANICAL SAMPLING & SECTION C – QUALITY MANAGEMENT)
37	X2. MONITORING COAL SAMPLING RATIOS USING CONTROL CHARTS (SECTION A – MECHANICAL SAMPLING & SECTION C – QUALITY MANAGEMENT) X2.1 Scope X2.2 Rationale (Commentary) X2.3 Data Collection and Charting Procedure X2.4 Detection of Special Causes (Out-of-Control Conditions) FIG. X2.1
38	X2.5 Monitoring the Coefficient of Variation X2.6 Monitoring the Average Observed Sampling Ratio TABLE X2.1
39	X3. THEORETICAL CONSIDERATIONS AND SOURCES OF FORMULAS AND TABLES (SECTION D – BIAS TESTING) X3.1 X3.2 X3.3 X3.4
40	REFERENCES

Additional information

Standard Title	D7430-08 Standard Practice for Mechanical Sampling of Coal
Published Code	ASTM
Publication Date	2008
Pages Count	40
ICS Codes	75.160.10 - Solid fuels

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