Metrological Controls and Performance Studies on a Liquefied Natural Gas Dispenser

Abstract

The requirement of metrological controls and performance tests stems from either the intended or potential use of measuring instruments in activities where the quality of measurement is of public concern. Such uses may be identified as the measurement of quantities related to specified classes of objects, commodities, phenomena, materials, or conditions. Performances of Liquefied Natural Gas Dispensers are critical because of their potential use in commerce, especially where custody transfer is involved. At an auto LNG dispensing station, LNG is stored and dispensed as automotive fuel to motor vehicles. Billing is done based on the quantity measured by the dispenser. Any potential error in measurement will lead to losses to the public. Tests were conducted as per general guidelines of OIML R117 (OIML R 117-1:2019 (E), Dynamic measuring systems for liquids other than water, 2019), Dynamic measuring systems for liquids other than water. This paper focuses on the model approval studies, metrological controls and performance tests on a LNG dispenser along with discussions and interpretations of results (OIML R 117-1:2019 (E), Dynamic measuring systems for liquids other than water, 2019; ISO/IEC 17,025, General requirements for the competence of testing and calibration laboratories, 2017; ISO/TS 21,748, Guide to the use of repeatability, reproducibility, and trueness estimates in measurement uncertainty estimation; Certificate number FCRI/WFL/T/2021/75 issued by Fluid Control Research Institute).