ASTM WK64771

    Revision of E1226 - 12a Standard Test Method for Explosibility of Dust Clouds

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    Active Standard: E1226 - 19

    Developed by Subcommittee: E27.05 | Committee E27 | Contact Staff Manager



    WK64771


    Keywords

    dust explosion; explosion pressure;

    Rationale

    The following sections were added: 5.5 On the opposite, recent testing has shown that certain metal dusts exhibit KSt values that are significantly larger in a 1-m chamber compared to the 20-L chamber [Ref]. There is also evidence of non-conservative vent area predictions for some metals when based on 20-L chamber data [Ref]. It is therefore recommended to perform tests in a 1-m chamber in order to measure metal dusts explosibility parameters accurately. [Ref] Taveau, J., Lemkowitz, S., Hochgreb, S., Roekaerts, D. Scaling up metal dusts deflagrations severity. 12th International Symposium on Hazards, Prevention and Mitigation of Industrial Explosions, Kansas City, Missouri, August 12-17, 2018. The rational is thus: Section 5.4 provides guidance on the phenomenon known as overdriving occurring in the 20-L chamber. Section 5.5 has been introduced with a conference reference on the phenomenon known as underdriving which can also occur in the 20-L volume. 5.6 For dusts which are not readily available in large quantities, a 20-L chamber can be used initially to perform a full explosibility test, serving as a screening phase to determine the worst-case dust concentration giving rise to the highest KSt/Pmax values. Once this worst-case dust concentration is established, 3 tests can be executed in a 1-m chamber to measure explosibility parameters accurately. The rational is thus: Section 5.6 has been introduced for situations where there is insufficient material to perform the full KSt/Pmax test in a 1m chamber a 20-L chamber can be used as a screening tool for the explosion severity determination. Then, three confirmatory runs can be performed at the worst-case concentration to verify the results of the 20-L chamber. 9. Sampling, Test Specimens, Test Units, and Storage 9.5 Samples that are susceptible to oxidize in contact with air, such as but not limited to metal dusts, shall be preserved in suitable inert gas or vacuum packaging until tested. The rational is thus: Section 9.5 informs the user that materials, whose chemistry that can be compromised by oxidation, should be stored under an inert atmosphere to preserve the sample.

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    Work Item Status

    Date Initiated:
    08-13-2018

    Technical Contact:
    Jerome Taveau

    Item:
    004

    Ballot:
    E27 (19-01)

    Status:
    Withdrawn From Balloting

    Item:
    002

    Ballot:
    E27 (19-02)

    Status:
    Ballot Item Approved as E1226-2019 and Pending Publication

    Item:
    003

    Ballot:
    E27 (19-02)

    Status:
    Ballot Item Approved as E1226-2019 and Pending Publication

    Item:
    004

    Ballot:
    E27 (19-02)

    Status:
    Ballot Item Approved as E1226-2019 and Pending Publication

    Item:
    008

    Ballot:
    E27 (19-02)

    Status:
    Ballot Item Approved as E1226-2019 and Pending Publication

    Item:
    009

    Ballot:
    E27 (19-02)

    Status:
    Ballot Item Approved as E1226-2019 and Pending Publication