The results of verification of turbine and rotary gas meters used as measuring instruments in gas supply systems of industrial enterprises are presented. It was found that about 50% of calibrated meters exceed the requirements for the permissible values of the main relative error, as a rule, in the range of minimum gas flow rates. Ways to increase the service life of gas meters are proposed.

Keywords: gas flow metering, gas meter, verification, basic relative error, gas flow

The most common fittings in gas networks are investigated, such as bends with different angles of change in flow direction and equal tees. The dependences of the values of the coefficients of local resistance depending on the gas flow rate, diameter, angle of rotation and material of the product are determined. Recommendations are given for determining the coefficient of local resistance of the studied fittings.

Keywords: gas pipeline, hydraulic calculation, pressure loss, coefficient of local resistance, gas consumption, geometrical parameters

Aspects of determination of pressure losses in local resistances at hydraulic calculation of underground polyethylene gas pipelines are considered. Calculation of coefficient of local resistance of saddle branch of firm FRIALEN (Germany) is resulted. The analysis of the dependence of the local resistance coefficient on the geometric parameters of the main gas pipeline and the gas pipeline-input is given.

Keywords: gas pipeline, hydraulic calculation, pressure loss, coefficient of local resistance, gas consumption, geometrical parameters