Evaluation of ASTM D5006 for Accuracy, Repeatability, and Reproducibility for Fuel System Icing Inhibitor (FSII) Concentrations < 0.10% by Volume and Varying Fuel Composition
Interim rept. 1 Jun 2011-30 Sep 2012
DAYTON UNIV RESEARCH INST (UDRI) OH
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Evaluation of ASTM D5006-11 for quantitation of fuel system icing inhibitor FSII concentrations 0.10 by volume in aviation fuel was performed to provide guidance regarding potential measurement accuracy at low concentrations. This evaluation is necessary due to recent reductions in the JP-8 FSII procurement and use limits. The study was comprised of two phases Evaluation of control standards of 0.010 to 0.080 in a specification Jet A-1 fuel, and effect of fuel type primarily aromatic content for target concentrations of 0.040 and 0.070. Measurements of blind samples were performed by two different operatorslaboratories, using all currently approved refractometers. Primary findings include 1 Excellent repeatability - 3 and interlaboratory reproducibility - 5, 2 Overestimation of FSII concentration by 2-10 for non-typical aviation fuels, 3 Slight differences in measured values with different approved refractometers, 4 Analog refractometers require user-estimation to three decimals, and 5 Fuel composition can affect FSII extraction percentage into aqueous phase. Overall, the D5006 repeatability and reproducibility appears to be substantially better than reported in the current method. Further evaluation via round-robin laboratory testing may be required for improved statistical analysis.
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