FIELD: physics; measurement.
SUBSTANCE: invention relates to measuring techniques and can be used for accurate measurement of mass of fuel liquefied hydrocarbons (LH). The method is based on an indirect method of statistic measurement, where the level, average density and average temperature of the liquid phase of the liquefied hydrocarbon gas is measured. From the measured values of average density and average temperature of the liquid phase of the liquefied hydrocarbons, the relative component content of the liquid and vapour phase of the liquefied hydrocarbons is determined. The average temperature of the vapour phase of the liquefied hydrocarbons is measured. From the measured values of pressure, average temperature of the vapour phase, the average density of the vapour phase is calculated. The level of the liquid phase of the liquefied hydrocarbons is then corrected. From the measured values of the level and average temperature of the liquid and vapour phases of the liquefied hydrocarbons, the volume of these phases is determined using a calibration table for the reservoir. Mass of the liquid and vapour phases of the liquefied hydrocarbons is calculated, as well as total mass as a sum of the mass of the liquid phase and vapour phase. Relative measurement error is automatically controlled and this involves calculation of relative measurement error, comparison with a given value and determination of recommended values of the minimum permissible level when storing the liquefied hydrocarbons and the minimum change in the level during intake and outlet of the liquefied hydrocarbons, providing for meeting requirements for the given value of measurement error. The obtained results are displayed on a display device for the convenience of the operator.
EFFECT: more accurate measurement of the mass of liquefied hydrocarbons, and effective dynamic control of measurement error during intake and outlet.
4 dwg
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