The influence of measurement uncertainty of associated quantities on the uncertainty of liquefied petroleum gas mass in a dynamic measurement system
DOI:
https://doi.org/10.21014/actaimeko.v15i1.2023Keywords:
measurement uncertainty, liquefied petroleum gas, measuring stationAbstract
Liquefied Petroleum Gas (LPG) is a versatile fuel with high energy content, easy storage, and a lower environmental impact compared to other fossil fuels. It is widely used in industry, commerce, and agriculture, making accurate systems for measuring LPG mass—the product’s trading unit—essential. This study evaluates the main factors influencing mass measurement in dynamic systems, considering regulatory standards and calculation algorithms. The measurement function and associated uncertainty calculation are presented, along with the key contributors to expanded uncertainty: corrections for pressure, density, and temperature. These account for approximately 45 %, 43 %, and 9 %, respectively, of the total uncertainty, based on experimental averages. Results show that the uncertainty limits established for secondary quantities by the Brazilian Institute of Metrology, Quality, and Technology have limited practical relevance. Although individual uncertainties exceed prescribed limits, the maximum uncertainty of LPG mass—the primary variable—remains compliant, underscoring the importance of output-focused criteria. Finally, the study recommends future research to refine acceptance criteria for individual calibration, aiming to ensure more efficient and reliable LPG mass measurements.
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Copyright (c) 2026 Gustavo Alvim, Elcio Cruz de Oliveira
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