GAS FLOW RATE METER Russian patent published in 2002 - IPC

FIELD: gas piping. SUBSTANCE: gas flow rate meter is installed in main pipe-line and includes inlet cylindrical part, nozzle, cylindrical branch pipe and conical extension piece. Chambers housing high-and low-pressure transducers communicating with their internal spaces by means of slot perforation are placed coaxially to inlet part and branch pipe. Double step nozzle in divided by point of inflection of its generatrix into convex and concave parts which determine profiles of steps of nozzle. Nozzle generatrix has shape characterized by certain mathematical expression. EFFECT: enhanced measurement accuracy thanks to suppression of turbulent disturbances of gas flow with simultaneous decrease of mass caused by reduction of linear dimension of nozzle. 2 dwg