METHOD TO MEASURE MASS OF LIQUID IN RESERVOIR Russian patent published in 2013 - IPC G01F1/76 

FIELD: measurement equipment.

SUBSTANCE: method to measure mass of liquid in a reservoir is based on calibration and consists in the fact that with the help of sensors the parameters are measured, which characterise physical and chemical characteristics of the stored liquid, values of which on each reservoir are sent into a base unit, connected by an information data transfer channel with a central information processing device, which differs by the fact that in process of calibration the quantity of liquid with known mass is poured in stages into the reservoir, the appropriate combination of controlled physical and chemical parameters is measured, and their values are memorised in the central information processing device, and in process of measurement the sought-for mass is determined in accordance with the following formula: $$M_X=b_1{q}_{\mathrm{1,}X}+\dots +b_k{q}_{k,X}+\dots +b_n{q}_{n,X}={\displaystyle \sum _{k=1}^m{b}_k{q}_{k,X}},$$ where M_x - sought-for value of the mass of the controlled liquid, q_k,x - combination of measured parameters of the controlled liquid. At the same time the coefficients bk are calculated according to the following formula: $$b_k=\frac{\Delta b_k}{\Delta },$$ where $$\Delta =\left|\begin{array}{c}{q}_{\mathrm{1,1}}\cdots q_{i\mathrm{,1}}\cdots q_{n\mathrm{,1}}\\ \cdots \cdots \cdots \cdots \cdots \cdots \cdots \\ q_{\mathrm{1,}k}\cdots q_{i,k}\cdots q_{n,k}\\ \cdots \cdots \cdots \cdots \cdots \cdots \cdots \\ q_{\mathrm{1,}n}\cdots q_{i,n}\cdots q_{n,n}\end{array}\right|,$$ $$\Delta b_k=\left|\begin{array}{c}{q}_{\mathrm{1,1}}\cdots M_1\cdots q_{n\mathrm{,1}}\\ \cdots \cdots \cdots \cdots \cdots \cdots \cdots \\ q_{\mathrm{1,}k}\cdots M_k\cdots q_{n,k}\\ \cdots \cdots \cdots \cdots \cdots \cdots \cdots \\ q_{\mathrm{1,}n}\cdots M_n\cdots q_{n,n}\end{array}\right|.$$ M_k - combination of reference values of the controlled liquid mass, used during calibration, q_i,k - combination of physical and chemical parameters of the liquid measured during calibration, i - corresponds to the number of the measured parameter (i=1…n), k - to the number of the calibration measurement (k-1…n).

EFFECT: increased accuracy of measurements, may be efficiently used for operative determination of mass of oil products in the reservoir under varying external conditions, by different parameters that are indirectly related to the sought-for value.

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