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AS 4264.4-1996

Withdrawn
Withdrawn

A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.

Coal and coke - Sampling - Determination of precision and bias
Available format(s)

Hardcopy , PDF 1 User , PDF 3 Users , PDF 5 Users , PDF 9 Users

Withdrawn date

06-30-2017

Language(s)

English

Published date

01-01-1996

Preview

Sets out methods for checking and adjusting the precision of sampling, checking the precision of sample preparation and measurement, and testing for bias in the sampling of coal and coke.

This Standard sets out methods for checking and adjusting the precision of sampling, checking the precision of sample preparation and measurement, and testing for bias in the sampling of solid mineral fuels.The procedures described in this Standard apply to sampling of coal and coke from both moving streams and stationary situations, and to the subsequent sample preparation.Experiments to check for precision and bias should be carried out for all sampling programs, whether manual or employing mechanical elements, implemented on a regular basis. Procedures should be repeated whenever significant change in the character of materials being sampled, especially in nominal top size or particle size distribution, has occurred.When a mechanical installation is commissioned or when principal parts are modified, check experiments for precision and bias should be carried out for the installation as a whole. The material to be used for bias tests should be the most variable material that is likely to be sampled. Various parameters, e.g. ash, can be used as measures of the variability of the material. One measure of variability that has been developed is the size-ash index.Where a bias higher than the maximum acceptable bias is detected, checks of individual elements of the system should be made, to determine which part or parts of the installation may require modification.The preferred method of testing for bias (see Clause 8) is by comparison with 'stopped-belt' sampling and using the critical properties in the operation of the sampling system.Design criteria of primary samplers for avoiding bias in a mechanical sampling system are given in AS 4264.1 and AS 4264.2. Reference is made to the geometry of cutter opening design and aperture, cutting speeds, measures for prevention of sample change and contamination, and procedures for examination of the performance of mechanical sampling equipment.

Committee
MN-001
DocumentType
Standard
ISBN
0 7337 0574 X
Pages
42
ProductNote
Withdrawn 20-03-2017. Reconfirmation Notice 21-08-2013
PublisherName
Standards Australia
Status
Withdrawn
Supersedes

First published as AS K153.1-1964 (being endorsement of BS 1017.1:1960 with Australian Amendment).Secon edition 1967.Revised and redesignated AS 1676-1975.Revised and redesignated AS 2646.8-1984.Revised and redesignated AS 4264.4-1996.Reconfirmed 2013. First published as AS K153.1-1964 (being endorsement of BS 1017.1:1960 with Australian Amendment). Secon edition 1967. Revised and redesignated AS 1676-1975. Revised and redesignated AS 2646.8-1984. Revised and redesignated AS 4264.4-1996.

AS 2418-1995 Coal and coke - Glossary of terms (Reconfirmed 2013) (Reconfirmed 2023)
AS 4264.3-1996 Coal and coke - Sampling Lower rank coal - Sampling procedures
AS 1152-1993 Specification for test sieves
AS 1038.16-1996 Coal and coke - Analysis and testing - Assessment and reporting of results
AS 1038.16-2005 Coal and coke - Analysis and testing Assessment and reporting of results (Reconfirmed 2016)
AS 4264.2-1996 Coal and coke - Sampling Coke - Sampling procedures (Reconfirmed 2013)
AS 4264.1-1995 Coal and coke - Sampling Higher rank coal - Sampling procedures

AS 4264.3-1996 Coal and coke - Sampling Lower rank coal - Sampling procedures
AS 1038.24-1998 Coal and coke - Analysis and testing Guide to the evaluation of measurements made by on-line coal analysers (Reconfirmed 2013) (Reconfirmed 2023)
AS 4264.5-1999 Coal and coke - Sampling - Guide to the inspection of mechanical sampling systems
AS 4264.2-1996 Coal and coke - Sampling Coke - Sampling procedures (Reconfirmed 2013)
AS 4264.1-2009 Coal and coke - Sampling Coal - Sampling procedures
AS 4433.4-2001 Guide to the sampling of particulate materials - Checking for bias
AS 2418-1995 Coal and coke - Glossary of terms (Reconfirmed 2013) (Reconfirmed 2023)

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