Description: The experimental study of butt-end nozzles, which are included in the device for domestic gas meters studies in the operation place were done. As a result of research it was determined the value of complex gas flow coefficient for three butt-end nozzles as a function of Reynolds number. The approximation of complex gas flow coefficient as a function of Reynolds number, which makes it possible to measure gas flow using butt-end nozzle in the air and natural gas, were done. Also the metrological analysis of the results were held, it confirmed possible of using of butt-end nozzles in device for domestic gas meters investigation.
Keywords: butt-end nozzle, complex gas flow coefficient, air, natural gas