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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ASTM D 2013 – 1986 Standard Method of Preparing Coal Sample for Analysis
A number in parentheses indicates the year of last reapproval. The user must exercise judgment to assess when the riffled mass is sufficiently close to the desired mass so as to not materially affect the results of the test s for which the composite sample is being prepared. Sample preparation should be checked at intervals by the methods described in Annex A1 or Annex A2. Link to Active This link will always route to the current Active version of the standard.
Any bias in the gross or divided sample before adherence to zstm practice will remain in the final sample resulting from use of this practice.
Do not produce riffle portions which are smaller in mass than stated in Table 1 of this standard. Results should be below 2. Also, a reserve sample may be desired in case a check analysis or test is required. d0213
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. In any group of 5 estimates of Sda2 based on 4 subsamples for each estimate, the ratio of the largest estimate to the average of the group should not exceed 2. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
These lower weights may be used for particular coals if they have been shown, by using the procedures of Annex A1. Add the individual lot or sub-lot masses to? Size px x x x x Most often, the sample is collected, reduced, and divided one or more times by use of a mechanical sampling system. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Adhere to the minimum weights required in Table 1. Samples may require air drying to feed properly through the reduction and dividing equipment. Coals used in these variance tests should be of similar ash content. Divide individual Sda2 values Column 9 by average Sda2 Column A separate moisture laboratory sample may be required, and portions may be required for grindability and other tests.
It is intended to be used for evaluation of nonreferee methods, and for testing of equipment. Mn to be combined to make the composite sample. Account for that information when making the composite.
However, some tests may require a sample of different mass or top size. 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.
It is advisable to mix the composite sample thoroughly, but without altering the moisture content, before reducing or dividing to smaller quantities.
A typical enclosed riffle is shown in Fig. Repeat for all samples, then combine the riffled portions of the original samples to form the composite. Practice D provides 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. Investigate values in excess of this ratio before proceeding with the test.
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: 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.
Under no circumstances shovel the sample into the riffle or dribble into the riffle from a small-mouthed container. Since astmm practice does not produce a numerical result, determination of bias is not applicable. 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.
These illustrate various designs, but other acceptable designs are available. The minimum discharge opening of the feed chute shall be the same width as the riffle slot opening. Typical mechanical sample dividers are shown in Fig. A number in parentheses indicates the year oflast reapproval.
ASTM D / DM – 18 Standard Practice for Preparing Coal Samples for Analysis
Riffle slots should be at least three times the top size of coal being divided. These lower weights may be used for particular coals if they have been shown, by using the procedures of A1. Thus, the d20133 0. Active view current version of standard.