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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Test Method D speci? A good text for this purpose is Grubbs, F. Typical mechanical sample dividers are shown in Fig. Astk steel or chilled iron plate with tamper, sledge, or hand bar may be used for preliminary crushing of any large lumps in the sample before feeding into the crusher. Riffle slots should be at least three times the top size of coal being divided.
The wheel should be rotated at a speed so that the particles fall gently from top to bottom of the container, mixing the sample thoroughly.
Do not allow the coal to build up in or above the riffle slots. D — 07 FIG. 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. 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. Therefore, carefully select the standard to be used to collect the gross sample.
ASTM D 2013 – 1986 Standard Method of Preparing Coal Sample for Analysis
The term is used within Practice D in the sense of its broad dictionary de? 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 ast, way to achieve a meaningful test result. Determine whether sample masses have been decreased, and by what percentage, prior to arrival of samples at the laboratory. A number in parentheses indicates the year oflast reapproval.
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.
ASTM D – 07 Standard Practice for Preparing Coal Samples for Analysis
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Divide this subsample by riffling with the small riffle to not less than the quantity speci? 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.
Do not add or delete particles without using a riffle in order to obtain the exact desired mass. Please copy and paste this embed script to where you want to embed Embed Script.
The values given in parentheses are provided for information purposes only. Adhere to the minimum weights required in Table 1.
Procedures for air drying and air-dry loss determination are provided in Test Method D 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: Combining values from the two systems may result in nonconformance with the standard.
The minimum discharge opening of the feed chute shall be the same width as the riffle slot opening. Sample preparation should be checked at intervals by the methods described in Annex A1 or Annex A2. Details appear in standard texts. One or more cutters may be used. Active view current version of standard Translated Standard: 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.
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.
ASTM D – Standard Method of Preparing Coal Sample for Analysis – Free Download PDF
Coals used in these variance tests should be of similar ash content. In this example, gross sample No.
If these criteria are not met, follow the procedure described in Practice D for the necessary information to improve techniques of division and analysis. Select and combine the riffle portions which yield a close approximation of the desired mass.
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. Thus, the difference 0. Historical Version s – view previous versions of standard Work Item s – proposed revisions of this standard Translated Version s: Coals used in these variance tests should be of similar ash content. Do not produce riffle portions which are smaller in mass than stated in Table 1 of this standard. A superscript epsilon e indicates an editorial change since the last revision or reapproval.
Link to Active This link will always route to the current Active version of the standard. 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.
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.
Precision and Bias The wheel should be rotated at a speed so that the particles fall gently from top to bottom of the container, mixing the sample thoroughly.
Current edition approved June 1, We need your help to maintenance this website. Divide the ground subsample by riffling, using the small riffle see 6. Another consideration is that since there are no provisions in this standard for dividing samples of top size larger than ?