Tojas The container should be about half full and never more than two thirds full to obtain good mixing of the sample. Coals used in these variance tests should be asgm similar ash content. The container should be about half full and never more than two thirds full in order to obtain good mixing of the sample. Result should be below 1.
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More D The mass and top size of the gross or divided sample collected by using these guides and practices are usually too large for chemical or physical testing. Any bias in the gross or divided sample before adherence to this practice will remain in the final sample resulting from use of this practice. Therefore, carefully select the standard to be used to collect the gross sample. Most often, the sample is collected, reduced, and divided one or more times by use of a mechanical sampling system.
The remaining sample may be further divided on-site to facilitate transporting it to the laboratory where further reduction and division likely occurs before analysis.
However, some tests may require a sample of different mass or top size. This procedure may be used to provide a sample of any mass and size consist from the gross or divided sample to, and including, the analysis sample. Scope 1. Unknown coals are to be considered under Group B. These lower weights may be used for particular coals if they have been shown, by using the procedures of A1.
The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
Tugal Data taken at intermediate steps are not consistent within limits of these rounding errors. Calculate the variances of these combinations: Ashm the desired composite mass by the percentage of the total which each sample represents to? Thank you for interesting in our services. A superscript epsilonindicates an editorial change since the last revision. It is the responsibility of the user of d standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Unknown coals are to be considered under Group B.
ASTM D2013 PDF