GB/T 19494.1-2004 English PDF (GB/T19494.1-2004)

GB/T 19494.1-2004: Mechanical sampling of coal -- Part 1: Method for sampling
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GB/T 19494.1-2004
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Mechanical Sampling of Coal - Part 1: Method of Sampling
(ISO 13909-1:2001 Hard Coal and Coke – Mechanical Sampling – Part 1:
General Introduction, ISO 13909-2:2001 Hard Coal and Coke – Mechanical
Sampling – Part 2: Coal – Sampling from Moving Streams, ISO 13909-3:2001
Hard Coal and Coke – Mechanical Sampling – Part 3: Coal – Sampling from
Stationary Lots, NEQ)
ISSUED ON: APRIL 30, 2004
IMPLEMENTED ON: OCTOBER 01, 2004
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 General Principles and Precision of Sampling ... 9
5 Establishment of Sampling Scheme ... 11
6 Sampling Method of Moving Coal Stream ... 20
7 Sampling Method of Stationary Coal ... 27
8 Packaging and Marking of Coal Sample ... 33
9 Sampling Report ... 33
Appendix A (Informative) Example of Calculating the Number of Sampling Units
and the Number of Increments per Sampling Unit ... 35
Appendix B (Normative) Evaluation of Mass-Basis Sampling Device ... 38
Foreword
GB/T 19494 Mechanical Sampling of Coal can be divided into 3 parts:
--- Part 1: Method of Sampling;
--- Part 2: Method of Sample Preparation;
--- Part 3: Determination of Precision and Bias Test.
This Part belongs to Part 1 of GB/T 19494. It corresponds to ISO 13909-1:2001 Hard
Coal and Coke – Mechanical Sampling – Part 1: General Introduction; ISO 13909-
2:2001 Hard Coal and Coke – Mechanical Sampling – Part 2: Coal – Sampling from
Moving Streams; and ISO 13909-3:2001 Hard Coal and Coke – Mechanical Sampling
– Part 3: Coal – Sampling from Stationary Lots. The degree of consistency between
this Part and the preceding three international standards are non-equivalent. Their
major differences are as follows:
--- Modify the standard structure and level according to the Chinese customs;
--- Modify the inappropriate provisions, inaccurate and incomprehensible
description in ISO 13909-1, ISO 13909-2, and ISO 13909-3; and supplement
their non-detailed contents;
--- This Part recommends a total precision table for coal sampling, sample
preparation, and testing;
--- This Part specifies the basic sampling unit coal quantity for the large and small
batches of coal; and the classification method of the sampling unit for a batch of
coal;
--- This Part specifies the calculation method of the number of the sub-samples
when the batch is larger or smaller than the amount of coal in the basic sampling
unit; and recommends the number of the increments in one basic sampling unit
when taking the non-full depth sampling for the stationary coal;
--- This Part specifies the minimum mass of the primary increment;
--- For stationary coal sampling, in addition to full depth sampling, this Part also
specifies stratified sampling and surface sampling at different depths;
--- For the sampling of stationary coal, this Part specifies that in addition to the spiral
rod sampler, all other samplers that meet the requirements of 6.5.1 of this Part
can be used;
--- This Part specifies the distribution method, when sampling the coal loading in
Mechanical Sampling of Coal
– Part 1: Method of Sampling
1 Scope
This Part of GB/T 19494 specifies the terms and definitions of mechanized coal
sampling, the general principles and precision of sampling, the establishment of
sampling scheme, the sampling method of moving coal streams, the sampling method
of stationary coal, the packaging and identification of coal samples, and the sampling
report.
This Part is applicable to the lignite, bituminous coal and anthracite.
2 Normative References
The provisions in following documents become the provisions of this Part of GB/T
19494 through reference in this Part. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Part, however,
parties who reach an agreement based on this Part are encouraged to study if the
latest versions of these documents are applicable. For undated references, the latest
edition of the referenced document applies.
GB/T 483 General Rules for Analytical and Testing Methods of Coal
GB/T 3715 Terms Relating to Properties and Analysis of Coal (GB/T 3715-1996,
eqv ISO 1213-2:1992)
GB/T 19494.2 Mechanical Sampling of Coal – Part 2: Method for Sample
Preparation (GB/T 19494.2-2004, ISO 13909-1:2001 Hard Coal and Coke –
Mechanical Sampling - Part 1: General Introduction; ISO 13909-4:2001 Hard Coal
and Coke – Mechanical Sampling – Part 4: Coal-Preparation of Test Samples,
NEQ)
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 Hard Coal and Coke –
Mechanical Sampling – Part 7: Methods for Determining the Precision of Sampling,
Sample Preparation and Testing; ISO 13909-8:2001 Hard Coal and Coke –
Mechanical Sampling – Part 8: Method of Testing for Bias, NEQ)
increment is proportional to the coal flowrate at the time of sampling.
3.21 Stratified random sampling
Randomly take an increment within the mass or time interval divided by the mass-basis
sample and time-basis sampling.
3.22 Replicate sampling
Take the increments at certain intervals; place them into different containers in turn to
form two or more coal samples with similar mass.
3.23 Duplicate sampling
Take the increments at certain intervals; alternatively place them into two different
containers to form two coal samples with similar mass.
3.24 Nominal top size
The sieve-hole size corresponding to the sieve closest to (but not greater than) 5% of
the cumulative mass fraction on the sieve.
3.25 Precision
The degree of conformity between independent test results obtained under specified
conditions.
NOTE: it is often expressed by a precision index, for instance, twice the standard deviation.
3.26 Error
Difference between observed value and acceptable reference value.
3.27 Variance
A measure of dispersion. Its value indicates the sum of square of the differences
between the observed values and their average divided by the number of observation
and minus 1.
3.28 Standard deviation
The square root of the variance.
3.29 Coefficient of variation
The percentage of standard deviation against the absolute value of the arithmetic
mean.
3.30 Random error
GB/T 19494.1-2004
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
D 21
Mechanical Sampling of Coal - Part 1: Method of Sampling
(ISO 13909-1:2001 Hard Coal and Coke – Mechanical Sampling – Part 1:
General Introduction, ISO 13909-2:2001 Hard Coal and Coke – Mechanical
Sampling – Part 2: Coal – Sampling from Moving Streams, ISO 13909-3:2001
Hard Coal and Coke – Mechanical Sampling – Part 3: Coal – Sampling from
Stationary Lots, NEQ)
ISSUED ON: APRIL 30, 2004
IMPLEMENTED ON: OCTOBER 01, 2004
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 General Principles and Precision of Sampling ... 9
5 Establishment of Sampling Scheme ... 11
6 Sampling Method of Moving Coal Stream ... 20
7 Sampling Method of Stationary Coal ... 27
8 Packaging and Marking of Coal Sample ... 33
9 Sampling Report ... 33
Appendix A (Informative) Example of Calculating the Number of Sampling Units
and the Number of Increments per Sampling Unit ... 35
Appendix B (Normative) Evaluation of Mass-Basis Sampling Device ... 38
Foreword
GB/T 19494 Mechanical Sampling of Coal can be divided into 3 parts:
--- Part 1: Method of Sampling;
--- Part 2: Method of Sample Preparation;
--- Part 3: Determination of Precision and Bias Test.
This Part belongs to Part 1 of GB/T 19494. It corresponds to ISO 13909-1:2001 Hard
Coal and Coke – Mechanical Sampling – Part 1: General Introduction; ISO 13909-
2:2001 Hard Coal and Coke – Mechanical Sampling – Part 2: Coal – Sampling from
Moving Streams; and ISO 13909-3:2001 Hard Coal and Coke – Mechanical Sampling
– Part 3: Coal – Sampling from Stationary Lots. The degree of consistency between
this Part and the preceding three international standards are non-equivalent. Their
major differences are as follows:
--- Modify the standard structure and level according to the Chinese customs;
--- Modify the inappropriate provisions, inaccurate and incomprehensible
description in ISO 13909-1, ISO 13909-2, and ISO 13909-3; and supplement
their non-detailed contents;
--- This Part recommends a total precision table for coal sampling, sample
preparation, and testing;
--- This Part specifies the basic sampling unit coal quantity for the large and small
batches of coal; and the classification method of the sampling unit for a batch of
coal;
--- This Part specifies the calculation method of the number of the sub-samples
when the batch is larger or smaller than the amount of coal in the basic sampling
unit; and recommends the number of the increments in one basic sampling unit
when taking the non-full depth sampling for the stationary coal;
--- This Part specifies the minimum mass of the primary increment;
--- For stationary coal sampling, in addition to full depth sampling, this Part also
specifies stratified sampling and surface sampling at different depths;
--- For the sampling of stationary coal, this Part specifies that in addition to the spiral
rod sampler, all other samplers that meet the requirements of 6.5.1 of this Part
can be used;
--- This Part specifies the distribution method, when sampling the coal loading in
Mechanical Sampling of Coal
– Part 1: Method of Sampling
1 Scope
This Part of GB/T 19494 specifies the terms and definitions of mechanized coal
sampling, the general principles and precision of sampling, the establishment of
sampling scheme, the sampling method of moving coal streams, the sampling method
of stationary coal, the packaging and identification of coal samples, and the sampling
report.
This Part is applicable to the lignite, bituminous coal and anthracite.
2 Normative References
The provisions in following documents become the provisions of this Part of GB/T
19494 through reference in this Part. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Part, however,
parties who reach an agreement based on this Part are encouraged to study if the
latest versions of these documents are applicable. For undated references, the latest
edition of the referenced document applies.
GB/T 483 General Rules for Analytical and Testing Methods of Coal
GB/T 3715 Terms Relating to Properties and Analysis of Coal (GB/T 3715-1996,
eqv ISO 1213-2:1992)
GB/T 19494.2 Mechanical Sampling of Coal – Part 2: Method for Sample
Preparation (GB/T 19494.2-2004, ISO 13909-1:2001 Hard Coal and Coke –
Mechanical Sampling - Part 1: General Introduction; ISO 13909-4:2001 Hard Coal
and Coke – Mechanical Sampling – Part 4: Coal-Preparation of Test Samples,
NEQ)
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 Hard Coal and Coke –
Mechanical Sampling – Part 7: Methods for Determining the Precision of Sampling,
Sample Preparation and Testing; ISO 13909-8:2001 Hard Coal and Coke –
Mechanical Sampling – Part 8: Method of Testing for Bias, NEQ)
increment is proportional to the coal flowrate at the time of sampling.
3.21 Stratified random sampling
Randomly take an increment within the mass or time interval divided by the mass-basis
sample and time-basis sampling.
3.22 Replicate sampling
Take the increments at certain intervals; place them into different containers in turn to
form two or more coal samples with similar mass.
3.23 Duplicate sampling
Take the increments at certain intervals; alternatively place them into two different
containers to form two coal samples with similar mass.
3.24 Nominal top size
The sieve-hole size corresponding to the sieve closest to (but not greater than) 5% of
the cumulative mass fraction on the sieve.
3.25 Precision
The degree of conformity between independent test results obtained under specified
conditions.
NOTE: it is often expressed by a precision index, for instance, twice the standard deviation.
3.26 Error
Difference between observed value and acceptable reference value.
3.27 Variance
A measure of dispersion. Its value indicates the sum of square of the differences
between the observed values and their average divided by the number of observation
and minus 1.
3.28 Standard deviation
The square root of the variance.
3.29 Coefficient of variation
The percentage of standard deviation against the absolute value of the arithmetic
mean.
3.30 Random error