ASTM WK65105

    Revision of D2386 - 15e1 Standard Test Method for Freezing Point of Aviation Fuels

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    Active Standard: D2386 - 15e1

    Developed by Subcommittee: D02.07 | Committee D02 | Contact Staff Manager



    WK65105


    Keywords

    aviation gasoline; aviation turbine fuels; crystallization point; determination; freezing point; low temperature tests; manual method; petroleum products; physical tests;;

    Rationale

    Some aviation fuels being produced have freezing point measured by automatic methods (such as IP529/ASTM D7153) between 85C to 100C. When this type of fuel was delivered to a location where recertification testing was required and if the freezing point test was done using the manual method (ASTM D2386 / IP 16), the result reported was 67C. The xx style of reporting was not in compliance with the method or specification requirements. Manual freezing point testing is still carried out in significant number of laboratories, therefore in order for this test to be used, the method has to be amended to allow the reporting of less than () values. 65C has been chosen as the limit as this is the lowest temperature that can be reached with solid CO2 and IPA. To achieve an even lower temperature, liquid nitrogen is required but may not be widely available. It is noted that IP 16 (Joint with ASTM D2386) has been updated with the same changes. It is further noted these changes will be used to support the current draft of Def Stan 91-091, which has been approved to contain the following note: During downstream distribution if the freezing point of the fuel is very low and cannot be reported when measured by IP 16 the limit is max -65 degree C. If no crystals appear during cooling of the fuel and when the thermometer indicates a temperature of 65C, the freezing point shall be recorded as below 65C. This limit does not apply if the freezing point is measured by IP 435/ASTM D5972, IP529/ASTM D7153, or ASTM D7154. Accordingly, sections of D2386 are proposed to be revised to reflect these changes: 1)Section 1.1 to revise the scope to allow reporting in case freezing point cannot be measured 2)Section 8.4 to define the use of crystallization point as defined in 3.1.2, and to record the coldest temperature achieved below 65C 3)Section 9.1 to report the freezing point to be below the coldest temperature achieved. 4)Section 10.1.3 to describe the range of applicability of the current precision statements (as noted in 10.1 and also footnote 6), and also demonstrate that the 65C temperature limit is indeed below the precision range.

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    Work Item Status

    Date Initiated:
    09-12-2018

    Technical Contact:
    Gordon Chiu

    Item:
    001

    Ballot:
    D02.07 (18-07)

    Status:
    In Balloting