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
Typical mechanical sample dividers are shown in Fig. Another consideration is that since there are no provisions in this standard for dividing samples of top size larger than ? Data taken at intermediate steps are not consistent within limits of these rounding errors. Select an approximate desired mass for the composite sample.
ASTM D – Standard Method of Preparing Coal Sample for Analysis – Free Download PDF
Select and combine the riffle portions which yield a close approximation of the desired mass. D – 86 Reapproved Standard Method of Preparing Coal Samples for Analysis 1 This stlll’ldard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year oflast revision.
However, some tests may require a sample of different mass or top size. Air dry in accordance with Test Asgm D Most often, the sample is collected, reduced, and divided one or more times by use of a aastm sampling system. If it does not? A number in parentheses indicates the year of last reapproval.
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. NOTE 4—It is highly unlikely that the exact number of grams needed for each sample can be obtained using a riffle while adhering to the requirements of Table 1. Work Item s – proposed revisions of this standard.
Crushers should be designed and operated in a manner to astmm the effect of induced air circulation and thus the potential for drying the coal. Calculate the percentage of the total sub-lot or lot which each sample represents.
The mean of’ errors resulting from a series of observations which astmm not tend towards zero. Please fill this form, we will try to respond as soon as possible.
ASTM D / DM – 18 Standard Practice for Preparing Coal Samples for Analysis
Originally approved in Details appear in standard texts. Summary of Practice 4. 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.
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, d20013 entirely their own responsibility. Unknown coals are to be considered under Group B.
The minimum discharge opening of the feed chute shall be the same width as the riffle slot opening. In addition, a method to determine the percent air dried moisture loss of the sample is provided.
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. The wheel should be rotated at a speed so that the particles fall gently from top to bottom of the container, mixing the sample c2013. Riffles properly used will reduce sample variability but cannot eliminate it. Samples may require air drying to feed properly through d2031 reduction and dividing equipment.
Criminal penalties may apply for noncompliance. One or more cutters may be used. Coals used in these variance tests should be of similar ash content. Any bias in the gross or divided sample before adherence to this practice will remain in the final sample resulting from use atm this practice.
Determine whether sample masses have been decreased, and by what percentage, prior to arrival of samples at the laboratory. Link to Active This link will always route to the astk Active version of the standard.
Any gross change in the division and analysis methods or in the ash characteristics of the test coal will nullify the test results. Non-additive parameters are those for which such interactions may occur or those for which de? The values given in parentheses are provided for information purposes only. At regular intervals, the cutter movement is reversed and a sample increment is collected on each trip through the coal stream. We need your help! Taking these and other issues into account leads to the requirement that preparation of composites be performed with strict adherence to the procedures which are described below and are summarized in Table 2.
This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Repeat for all samples, then combine the riffled portions of the original samples to form the composite.