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 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. Designate the results R1, R2, R ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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. VP, the variance of the difference between duplicate analyses; VQ, the variance of the difference between the averages of duplicate analyses; and VR, the variance of the difference between the average of each four analyses, as follows: If it does not?
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Most often, the sample is collected, reduced, and divided one or more times by use of a mechanical sampling system. Divide each subsample to no less than the minimum weights as outlined in Table 1. Select an approximate desired mass for the composite sample. Unknown coals are to asm considered under Group B. Criminal penalties may apply for noncompliance.
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 d2031 and mass suitable to the performance of testing.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. D22013 by mechanical means before extracting portions for analysis.
It is preferable that feed chutes and enclosed riffles be used. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Account for that information when making the composite.
ASTM D – 07 Standard Practice for Preparing Coal Samples for Analysis
The wheel should be rotated at a speed so that the particles fall gently from top to awtm of the container, mixing the sample thoroughly. Select and combine the riffle portions which yield a close approximation of the desired mass. Therefore, carefully select the standard to be used to collect the gross sample. A typical enclosed riffle is shown in Fig. The container should be about half full and never more than two thirds full astk obtain good mixing of the sample.
NOTE 1—It is recommended that, in the case of mechanical division in which an increment is not thoroughly mixed with other increments before division, a portion of each increment be collected by the subsequent stage increment collection process. 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. NOTE 3—As used in this standard, parameters d20133 are additive are those having values that are not affected by interactions between the physical and chemical properties of the combined individual samples.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The values given in parentheses are provided for information purposes only.
ASTM D 2013 – 1986 Standard Method of Preparing Coal Sample for Analysis
Pass the coal through the riffle from a feed scoop, feed bucket, or riffle pan having a lip or opening the full width of the riffle. If, however, it is desired to crush satm to No.
A number in parentheses indicates the year oflast reapproval. Divide average Sda2 Column 10 by overall averages Sda2. On the other hand, when the sought-after parameters are non-additive for example, ash fusibility and Hardgrove grindabilityanalysis of a composite sample is the only way to achieve a meaningful test result. Crushers should astn designed and operated in a manner to minimize the effect of induced air circulation and thus the potential for drying the coal.
When the analytical parameters of interest are additive for example, proximate and ultimate analyses the preferred method is to test the individual samples and astmm a ton-weighted mathematical average to determine the result for the lot or consignment.
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A superscript epsilonindicates an editorial change since the last revision. Indicate on the laboratory report that data were obtained by testing a close-approximation composite, and that the results may therefore not fully re? Divide this subsample by riffling with the small riffle to not less than the quantity speci?
Data taken at intermediate steps are not consistent within limits of these rounding errors. Summary of Method equipment may be used: Last previous edition D “. In addition, after completing 30 sets, by groups of 5, the ratio of the largest group average to the overall average should not exceed 1.
These lower weights may be used for particular coals if they have been shown by using the procedure of Annex A1. In addition, a method to determine the percent air dried moisture loss of the sample is provided.
Originally published as D – 62 T. The term is used within Practice D in the sense of its broad dictionary de? Also, a reserve sample may be desired in case a check analysis or test is required.