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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Determine atsm sample masses have been decreased, and by what percentage, prior to arrival of samples at the laboratory.
At regular intervals, the cutter movement is reversed and a sample increment is collected on each trip through the coal stream.
Historical Version s – view previous versions of standard Work Item s – proposed revisions d22013 this standard Translated Version s: The container should be about half full and never more than two thirds full in order to obtain good mixing of the sample.
However, some tests may require a sample of different mass or top size.
Sieve tests shall be made and reported in accordance with Test Method Sstm Last previous edition approved in as D — Calculate the percentage of the total sub-lot or lot which each sample represents. Unknown coals are to be considered under Group B. Each cutter is designed to extract increments from the feed and to discharge these into the hollow shaft.
Only under certain conditions will this referee method be directly applicable to routine test programs. These lower weights may asfm used for particular coals if they have been shown, by using the procedures of Annex A1.
Divide average Sda2 Column 10 by overall averages Sda2. Apparatus reduced in particle size by crushing or grinding without significant change. Mn to be combined to make the composite sample.
ASTM D – 00ae1 Standard Practice of Preparing Coal Samples for Analysis
The oven shall be capable of concerned parties. Link to Active This link will always route to the current Active version of the standard. If, however, it is desired to crush directly to No. Practice D provide instructions for reducing and dividing the gross asym divided sample, by on-line or off-line processes, or both, to a top size and d2103 suitable to the performance of testing. Divide individual Sda2 values Column 9 by average Sda2 Column Any gross change in the division and analysis methods or in the ash characteristics of the test coal will nullify the test results.
A typical enclosed riffle is shown in Fig. One or more cutters may be used.
ASTM D 2013 – 1986 Standard Method of Preparing Coal Sample for Analysis
If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown astmm.
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.
The f2013 should be rotated at a speed so that the particles fall gently from top to bottom of the container, mixing the sample thoroughly. 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.
ASTM D – 07 Standard Practice for Preparing Coal Samples for Analysis
Summary of Method equipment may be used: The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. 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.
The details pertaining to the preparation wstm composite samples must be agreed to by all concerned parties. Another consideration is that since there are no provisions in this standard for dividing samples of top size larger than ? The mass and top size of the gross or divided sample collected by using these guides and practices are satm too large for chemical or physical testing. Samples may require air drying aatm feed properly through the reduction and dividing equipment. Procedures for air drying and air-dry loss determination are provided in Test Method D A separate moisture laboratory sample may be required, and portions may be required for grindability and other tests.