1、Designation: D293/D293M 18Standard Test Method for theSieve Analysis of Coke1This standard is issued under the fixed designation D293/D293M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A number in par
2、entheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method describes the separation of a cokesample into defined size fractions and expressing said fractionsas a mass weight percent of the g
3、ross sample.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in nonconfo
4、rmancewith the standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory
5、limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organiza
6、tion TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D346/D346M Practice for Collection and Preparation ofCoke Samples for Laboratory AnalysisD4621 Guide for Quality Management in an OrganizationThat Samples or Tests Coal and Coke (Withdrawn 2010)3E11 Specificat
7、ion for Woven Wire Test Sieve Cloth and TestSievesE323 Specification for Perforated-Plate Sieves for TestingPurposes3. Significance and Use3.1 This test method determines the size distribution of cokefor conformance to specifications of percentages retained ondesignated screen sizes.4. Apparatus4.1
8、SievesUse square-hole sieves conforming to Specifi-cation E11. Where sieves larger than 100 mm 4 in. arerequired, the specifications for same shall be by mutualagreement between interested parties. Permissible variations insieve openings and spacings shall be in accordance withSpecification E11.4.1.
9、1 For complete characterization of the size range of acoke sample, the number and size of the selected sieves shouldbe such that no more than 25 % of the gross sample mass orweight will be retained on any given sieve.4.1.2 For coke 38.1 mm 112 in. and larger in size, sievesof heavy double-crimped wi
10、re and square or rectangular frameswith 0.56 m2to 0.84 m26 ft2to9ft2 of sieve area aresatisfactory. For coke smaller than 38.1 mm 112 in. in size,sieves of double-crimped wire and square or circular frameswith 0.19 m2to 0.37 m22 ft2to4ft2 of sieve area are usuallymore convenient.4.2 Weighing Balance
11、, preferably of the platform type,having a sensitivity of 0.025 kg 0.05 lb or better, at ratedcapacity and with graduations such that 0.05 kg 0.1 lb can beread without interpolation.5. Test Sample5.1 The test sample shall be taken in accordance withPractice D346/D346M.6. Procedure6.1 Starting with t
12、he sieve having the largest opening, sievethe sample of coke in quantities small enough to preventplugging and clogging of the sieve.6.1.1 Hand-fit each piece of coke retained on the 38.1 mm112 in. or larger sieve. A piece is considered undersize if, insome position and without forcing, it passes th
13、e sieve opening.6.1.2 Shake vigorously on each succeeding sieve cokepieces passing the 38.1 mm 112 in. sieve. This shaking maybe performed manually or mechanically provided mechanicalshaking yields results equivalent to manual shaking. Note that1This test method is under the jurisdiction of ASTM Com
14、mittee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.15 on MetallurgicalProperties of Coal and Coke.Current edition approved Sept. 1, 2018. Published September 2018. Originallyapproved in 1928. Last previous edition approved in 2010 as D293 93 (2010).DOI: 10.1520/D0293_D02
15、93M-18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard
16、 is referenced onwww.astm.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principl
17、es for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1the objectives of shaking, either manual or mechanical, are toplace all of the naturally occurring pieces of a given size rangeon the appro
18、priate sieve and to avoid degradation of thenaturally occurring sizes.6.2 Record to the nearest 0.05 kg 0.1 lb the mass weightof coke retained on each sieve and that which passes thesmallest sieve used. For routine testing, the sum of all thesize-fraction masses weights may be taken as the total mas
19、sweight of coke tested.6.2.1 Samples containing pieces retained on 50 mm 2 in.sieves and larger need not be dried. However, when a higherdegree of accuracy is desired, dry the gross sample to less than1 % moisture and accurately weigh before sieving. Dry allsamples of coke containing only pieces whi
20、ch pass a 50 mm2 in. sieve to less than 1 % moisture before testing.7. Report7.1 Report the masses weights of the size fractions as apercentage of the mass weight of the gross sample. Calculatepercentage to the nearest 0.1 %. Record the results startingwith the fraction of largest sieve size, which
21、may be shown forseparate fractions or cumulatively.7.2 For those tests in which the gross sample is weighedbefore sieving, the sum of the masses or weights of all sizefractions should equal the measured gross mass weight. Incases in which the cumulative mass weight of size fractionsdiffers from the
22、initial gross mass weight by 0.5 % or less ofthe gross mass weight, adjustment can be made in the massweight of the size fraction passing the smallest sieve size.With careful procedure, this difference should not exceed0.5 %.8. Precision and Bias8.1 RepeatabilityThe precision of this test method isb
23、eing investigated by a task group. At this time the values havenot been determined.8.2 ReproducibilityNo precision statement has been de-veloped for this test method because of the impracticality ofobtaining, transporting, and handling representative splits ofthe materials in the quantities that wou
24、ld be needed to establishthe precision statement.8.3 BiasThe lack of a reference material precludes a biasstatement.9. Keywords9.1 breakage; coke; degradation; incrementsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
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