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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A superscript epsilon e indicates an editorial change since the last revision or reapproval. If, however, it is desired to crush directly to No. Active view current version of standard. Crushers should be designed and operated in a manner to minimize the effect of induced air circulation and thus the potential for drying the coal. Multiply the desired composite mass by the percentage of the total which each sample represents to? Any gross change in the division and analysis methods or in the ash characteristics of the test coal will nullify the test results.
Hard steel or chilled iron plate with tamper, sledge, or hand bar may be used asym preliminary crushing of any large lumps in the sample before feeding into the crusher. The term is used within Practice D in the sense of its broad dictionary de?
ASTM D 2013 – 1986 Standard Method of Preparing Coal Sample for Analysis
Quickly pass the subsample through a ? Each cutter is designed to extract increments from the feed and to discharge these aztm the hollow shaft. 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. Most often, the sample is collected, reduced, and divided one or more times by use of a mechanical sampling system.
Link to Active This link will always route to the current Active version of the standard. At regular intervals, the cutter movement is reversed and a sample increment is collected on each trip through the coal stream.
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. NOTE 2—As used in this standard, 2d013 term represent together with its related forms does not imply that samples satisfy a particular quantitative or statistical relationship to the coal which was sampled.
It is intended to be used for evaluation of nonreferee methods, and for testing of equipment. 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 d203. 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 produce riffle portions which are smaller wstm mass than stated in Table 1 of this standard. Glass containers, sealed with rubber gaskets, may be used, but care must be taken to avoid breakage in transport.
ASTM D – Standard Method of Preparing Coal Sample for Analysis – Free Download PDF
Compute that value as shown below: Last previous edition D “. If these criteria are met, the variance of division and analysis may be taken as the overall average Sda2 of the 30 sets of data. These lower weights may be used for particular coals if they have been shown, by c2013 the procedures of Annex A1. Only under certain conditions will this referee method be directly applicable to routine test programs.
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. These illustrate qstm designs, but other acceptable designs are available. We need your help to maintenance this website. 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. 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.
Do not add or delete particles without using a riffle in order to obtain the exact desired mass. Divide the ground subsample by riffling, using the small riffle see 6. Many terms used in this practice may be qstm in Terminologies D and E and in Practice E The container should be about half full and never more than two thirds full in order to obtain good mixing of the sample.
Sieve tests shall be made and reported in accordance with Test Method D Mn to be combined to make the composite sample.
However, some tests may require a sample of different mass or top size. Result should be below 1.
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.
These lower weights may be used for particular coals if they have been shown, by using the procedures of Annex A1. Summary zstm Practice 4. Please copy and paste this embed script to where you want to embed Embed Script. Select and combine the riffle portions which yield a close approximation of the desired mass.
Historical Version s – view previous versions of standard. 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. 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. The details pertaining to the preparation of 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 d20133 larger than ? Reduce the particles retained on the screen, on a bucking board or mortar and pestle to pass the sieve, and add atsm what passed through the sieve and mix thoroughly. Current edition approved June 1, A typical riffle is shown in Fig. Please help us to share our service with your friends.