ASTM D_自然科学_专业资料。Designation: D – 07 Standard Practice for Preparing Coal Samples for Analysis1 This standard. ASTM. American Society for Testing and Materials. Btu/lb. British thermal units per pound cal/g (ISO ), or m/s (18 inches/s) (ASTM D). ASTM D/DM Standard Practice for Preparing Coal Samples for Analysis. standard by ASTM International, 09/01/ View all product details.
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This standard does not purport to address all of the safety concerns, if any, associated with its use.
Do not add or delete particles without using a riffle in order to obtain the exact desired mass. Designate the results R1, R2, R A typical riffle is shown in Fig.
ASTM D – Standard Method of Preparing Coal Sample for Analysis – Free Download PDF
Practice D provide instructions for reducing and dividing the gross or divided sample, by on-line or off-line processes, or both, to a top size and mass suitable to the performance of testing. The container should be about half full and never more than two thirds full in order to obtain good mixing of the sample.
Distribute this large number of increments equally asgm the entire discharge from the sample crusher because crushers can introduce appreciable segregation. A superscript epsilonindicates an editorial change since the last revision. Significance and Use 5. Thank you for interesting in our services. Apparatus reduced in particle size by crushing or grinding without significant change.
ASTM D – 00ae1 Standard Practice of Preparing Coal Samples for Analysis
Under no circumstances shovel the sample into the riffle or dribble into the riffle from a small-mouthed container. Link to Active This link will always route to the d20113 Active version of the standard. Unknown coals are to be considered under Group B. Combining values from the two systems may result in nonconformance with the standard.
These lower weights may be used for particular coals if they have been shown, by using the procedures of Annex A1. The mean of’ errors resulting from a series of astk which does not tend towards zero.
Since this practice does not produce a numerical result, determination of bias is not applicable. A number in parentheses indicates the year oflast reapproval.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? In addition, a method to determine the percent air dried moisture loss of the sample is provided. Current edition approved June 1, Only under certain conditions will this referee method be directly applicable to routine test programs.
Do not produce riffle portions which are smaller in mass than stated d2103 Table 1 of this standard.
ASTM D 2013 – 1986 Standard Method of Preparing Coal Sample for Analysis
The minimum discharge opening of the feed chute shall be the same width as the riffle slot opening. In addition, after completing ashm sets, by groups of 5, the ratio of the largest group average to the overall average should not exceed 1. Reduce the particles retained on the screen, on a bucking board or mortar and pestle to pass the sieve, and add to what passed through the sieve and mix thoroughly. Precision and Bias These lower weights may be used for particular coals if they have been shown, by using the procedures of A1.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Any gross change in the division and analysis methods or in the ash characteristics of the test coal will nullify the test results. However, some tests may require a sample of different mass or top size. Most often, the sample is collected, reduced, and divided one or more times by use of a mechanical sampling system.
If these criteria are met, the variance of division and analysis may be taken as the overall average Sda2 of the 30 sets of data. Coals used in these variance tests should be of similar ash content. Historical Version s – view previous versions of d20113 Work Item s – proposed revisions of this standard Translated Version s: In this example, gross sample No. Therefore, carefully select the standard to be used to collect the gross sample.
Unknown coals are to be s2013 under Group B.
NOTE 2—As used in this standard, the term represent together with its related forms does not imply that samples satisfy a particular quantitative or statistical relationship to the coal which was sampled. If these criteria are not met, follow the procedure described in Practice D for the necessary information to improve techniques of division and analysis.
Originally approved in