Get 118-2017: State Primary Standard of the Units of Volumetric and Mass Flow Rates of Gas. History of Creation and Confirmation of Calibration, and Measurement Capabilities

The history of the creation of GET 118-2017, the State Primary Standard of the Units of Volumetric and Mass Flow Rate, is presented. The significant role of the international comparisons that were performed on different stages of the creation of GET 118-2017 is noted; results of comparisons were confirmed, which made it possible to incorporate into the KCDB database the calibration and measurement capabilities of the Russian Federation in the area of measurements of the volumetric flow rate of gas and also helped to determine the directions and measures designed to improve the standard. A patented method of comparison for calibration of critical nozzles implemented in GET 118-2017 for transmission to working standards of units of the volumetric and mass flow rate of gas is described. The designs, structure, and characteristics of GET 118-2017 are presented. More than 700 working standards of units of the volumetric and mass flow rates of gas used in the Russian Federation and certain member countries of COOMET are now traced to GET 118-2017, with the total number of applications to GET 118-2017 for transmission of the unit of a quantity exceeding 3500 annually.