ASTM WK68182

    Revision of D2013 / D2013M - 18 Standard Practice for Preparing Coal Samples for Analysis

    (What is a Work Item?)

    Active Standard: D2013 / D2013M - 18

    Developed by Subcommittee: D05.23 | Committee D05 | Contact Staff Manager



    WK68182


    Keywords

    coal; composite; division; reduction;;

    Rationale

    Reduction of coal samples to 60 mesh is an important and necessary step for all subsequent coal analysis methods. Section 9.2.3.6 requires all samples to be passed through a 60 mesh screen after pulverization, and any oversized particles shall be reduced on a buckboard and added to the sample mass. Some labs have prepared technical justifications for skipping this step on higher-ranked coals with no perceived bias. But on lower-ranked coals, passing every sample through a 60 mesh sieve and reducing oversize particleshas been shown to cause statistically significant moisture and heating value bias. After discussion, the task group decided to remove the next-to-last sentence in Section 9.2.3.6 This action would eliminate the requirement to pass every sample through a 60 mesh sieve.

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    Work Item Status

    Date Initiated:
    05-13-2019

    Technical Contact:
    Stephen Smith

    Status:
    Draft Under Development