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.
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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. Pass the coal through the riffle from a feed scoop, feed bucket, or riffle pan having a lip or opening astn full width of the riffle. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
The mass and top atm of the gross or divided sample collected by using these guides and practices are usually too large for chemical or physical testing. 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. Compute that value as shown below: Results should be below 2. The data obtained from tests using consistent sample preparation and analysis method are used to estimate the random errors in the various stages of sample division and analysis.
If you feel that your comments have not astmm a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. ELU TGS PDF Two slotted cones are locked together and rotated on a vertical shaft so that on each revolution the common slot operating intercepts the falling stream of coal and collects an increment.
Unknown coals are to be considered d Group B. 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. Non-additive parameters are those for which such interactions may occur or those for which de?
D — 07 FIG. Mn to be combined to make the composite sample. The term is used within Practice D in the sense of its broad dictionary de?
The container should be about half full and never more than two thirds full to obtain good mixing of the sample. We need your help! Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. If, however, it is desired to crush directly to No.
However, some tests may require a sample of different mass or top size. The analysis sample can be used to determine the value of the coal represented, its ability to meet specifications, its environmental impact, as well as for other purposes. Glass containers, sealed with rubber gaskets, may be used, but care must be taken to avoid breakage in transport. Quickly pass the subsample through a? These lower weights may be used for particular coals if they have been shown, by using the procedures of A1.
Sample preparation should be checked at intervals by the methods described in Annex A1 or Annex A2. Select an approximate desired mass for the composite sample. Investigate values in excess of this ratio before proceeding with the test. When the analytical parameters of interest are additive for example, proximate and ultimate analyses the preferred method is to test the individual samples and perform a ton-weighted mathematical average to determine the result for the lot or consignment.
Do not allow the coal to build up in or above the riffle slots. Combining values from the two systems may result in nonconformance with the standard. Adhere to the minimum weights required in Table 1. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. One or more cutters may be used. Indicate on the laboratory report that data were obtained by testing a close-approximation composite, and that the results may therefore not fully re?
Coals used in these variance tests should be of similar ash content. Divide individual Sda2 values Column 9 by average Sda2 Column Samples may aatm air drying to feed properly through the reduction and dividing equipment. Riffle slots f be at least three times the top size of coal being divided. Thus, the difference 0. Active view current version of standard. Most Related.
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. Designate the results R1, R2, R Referenced Documents purchase separately The documents listed below asrm referenced within the subject standard but are not provided as part of the standard. 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.