FILTERABILITY OF AVIATION TURBINE FUEL: ASTM D6824
EXPLANATION
This test method is intended for use in the laboratory or field in evaluating cleanliness of aviation turbine fuel. A change in filtration performance after storage, pretreatment, or commingling can be indicative of changes in fuel condition. Relative filterability of fuels may vary, depending on filter porosity and structure, and may not always correlate with results from this test method. Causes of poor filterability in industrial refinery filters include fuel degradation products, contaminants picked up during storage or transfer, incompatibility of commingled fuels, or interaction of the fuel with the filter media. Any of these could correlate with orifice or filter system plugging, or both. ASTM specification fuels falling within the scope of this method are Specifications ASTM D1655 and ASTM D6615, and the military fuels covered in the military specifications. This test method is not applicable to fuels that contain undissolved water.
TEST SUMMARY
A sample is passed at a constant rate 20 mL/min through a standard porosity filter medium. The pressure drop across the filter and the volume of filtrate are monitored. The test is concluded either when the pressure drop across the filter exceeds 104 kPa, or when 300 mL have passed through the filter.
TEST PRECISION
This test method has no bias because the filterability quality factor is defined only in terms of this test method.
