Foreword

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This document was prepared by Technical Committee ISO/TC 27, Coal and Coke, Subcommittee SC 4, Sampling.

This second edition cancels and replaces the first edition (ISO 18283:2006), which has been technically revised. It also incorporates the Technical Corrigendum ISO 18283:2006/Cor.1:2006.

The main changes are as follows:

— Removal of any reference to intermittent sampling. Only continuous sampling is permitted.
— Discussion of the need to eliminate bias prior to discussing precision.
— Deletion of the separate tables on calculated numbers of increments.
— Deletion of the table on reference increment mass.
— Separation of tables for minimum sample masses for coal and coke.
— Removal of the table for reduced minimum sample mass for large sizes of coal and coke.
— Inclusion of manual sampling from a moving conveyor, provided a risk assessment is conducted at the outset and that this type of sampling is only permitted on a slow-moving belt or at low flow rates. Furthermore, at higher flow rates, mechanical assistance is necessary to ensure that primary increments can be collected safely.
— Restriction of the type of probes that can be used.
— Deletion of augers for manual sampling.
— Inclusion of a photograph of a gated riffle.
— Exclusion of sampling of large fuels in excess of the nominal top sizes in Tables 1, 2 and 4, because it is not practical.

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BS ISO 18283:2022

Coal and coke. Manual sampling

Current

Published:

31 May 2022