A Comparative Study of Fuel Density Precision Data Using Digital Densimeter Meters at Two Different Temperatures

Mauro Alves Correa de Camargo, Gabriela Knippelberg Bifano Manea and Elcio Cruz de Oliveira ()
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Mauro Alves Correa de Camargo: Measurement and Quality Management, Petrobras Transporte S.A., Rio de Janeiro 20090-901, Brazil
Gabriela Knippelberg Bifano Manea: Measurement and Quality Management, Petrobras Transporte S.A., Rio de Janeiro 20090-901, Brazil
Elcio Cruz de Oliveira: Postgraduate Programme in Metrology, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro 22451-900, Brazil

Energies, 2023, vol. 17, issue 1, 1-10

Abstract: The widespread use of liquid fuels can be monitored by their density and light fractions, which affect storage, combustion, handling, and contractual issues. The quantitative measurement of fuel density is carried out using an analytical procedure whose test method presents precision data (repeatability and reproducibility) at 15 °C, whereas Brazilian commercial legislation uses a base temperature of 20 °C. Therefore, the scope of this study was to evaluate whether there are statistically significant differences between these two temperatures. An interlaboratory study, considering homogeneity and stability checks, was carried out, and the data were treated using a one-way analysis of variance in a single-stage nested design for calculating the density precision data (under repeatability and reproducibility conditions). After using an F test to compare the variances at 15 °C and 20 °C, one concluded that these precision data are not always metrologically comparable.

Keywords: interlaboratory study; homogeneity check; stability check; ANOVA for ILS data; r&R study (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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