METHOD OF CALIBRATING AID FOR MEASURING VOLUME FRACTION OF FREE GAS Russian patent published in 2007 - IPC G01N23/02 

FIELD: measuring technique; calibration devices.

SUBSTANCE: mixtures of known volume fraction of free gas are formed in measuring vessel made of same material as working part of pipeline; geometric sizes in cross-section of vessel are also the same as those one for pipeline. Value of direct ionizing radiation r passed through the vessel is measured at measuring vessel for any gas-liquid mixture with known value of volume fraction ϕi, which direct radiation was registered after mixture was radiated by narrow beam of ionizing radiation. After that values of ϕpassedi are calculated, which values correspond to known values ϕi. The relation is received which ties value of volume fraction ϕ of free gas in gas-liquid mixture with value of volume fraction of free gas ϕpassed, which contains in that part of volume of gas-liquid mixture, which was radiated by narrow beam of ionizing radiation. Then within working part of pipeline the value of dissipated radiation r _dirdisj is measured for a number of gas-liquid mixtures with unknown volume fraction ϕ_j of free gas. Value of direct radiation r_dirpassedj is measured additionally. Then values of volume fractions ϕ_dirj of free gas are measured, which free gas contains in that part of volume of gas-liquid mixtures with unknown values of ϕj, which is irradiated by narrow beam of ionizing radiation. Then while using dependence received for measuring vessel before, which dependence ties value ϕ and value ϕ_dir, numerical values of ϕj are found which values correspond to calculated values ϕ_dirj. Calibration dependence to be found is determined on the base of measured values r _{dir passed}j and ϕj.

EFFECT: simplified method of calibration of aid for measuring volume fraction of free gas.

2 dwg