When operating gas distribution systems, the process of releasing various gases into the atmosphere is inevitable, negatively affecting the environment and creating a greenhouse effect. These gases can be either products of combustion of gaseous fuel or the result of natural gas leaks from gas pipelines and equipment. The main articles of gas leaks from gas pipelines and ways to minimize the negative impact on the environment are given.

Keywords: gas distribution system, greenhouse effect, gas combustion, methane, flanged and threaded connections, leaks, safety relief valve

The article considers the requirements of regulatory documents to ensure fire safety during construction and operation of gas distribution pipelines in Russia and China. The different approach to fire risk reduction in the two countries is revealed: more specific and stringent requirements in China and general requirements related to fire hazardous facilities in Russia.

Keywords: fire risks, fire regulations, natural gas combustion, causes of natural gas fires, natural gas transportation, fire safety

The use of closed methods for laying underground polyethylene gas pipelines using horizontal directional and directional drilling methods when crossing artificial and natural obstacles is considered. The results of calculating the geometric parameters of the working and receiving pits when laying polyethylene gas pipelines using a closed method using horizontal directional drilling are presented.

Keywords: polyethylene gas pipeline, closed installation method, horizontal directional drilling, directional drilling, dimensions of working and receiving pits

The value of the efficiency of domestic gas boilers of the brand Baxi ECO-4S 24 with various schemes of air supply and smoke removal is considered. The difference in the calculated efficiency values and the passport values is analyzed.

Keywords: efficiency, flue gas discharge, household gas boiler, thermal balance, energy efficiency

The article considers the influence of seismic load with different ballistics on aboveground steel gas pipelines of various diameters in areas of possible earthquakes. The change in the proportion of seismic load to the total load acting on gas pipelines during operation is investigated.

Keywords: seismic activity, loads on gas pipelines, analysis of seismic activity, degree of seismic hazard

The analysis of accidents on the main gas pipelines was carried out. The mathematical dependences of the volume of gas located in a gas pipeline of various diameters are determined. A nomogram is proposed to determine the volume of natural gas located in certain sections of the gas distribution network.

Keywords: gas pipelines, accident rate, degassing, gas bleeding. gas compressibility factor

The article substantiates the need to clarify the value of pressure losses in the shut-off valves. Various methods of determining the coefficient of local resistance of steel ball valves are considered. A comparative analysis of the values of the local resistance coefficient obtained theoretically and experimentally is performed. Recommendations on the application of numerical values of the local resistance coefficient of steel ball valves are given.

Keywords: hydraulic calculation, pressure loss, disconnecting devices, ball valve, local resistance coefficient

The work of new Russian regulators RED is being considered. The results of a study of the compliance of regulators with the declared class of locking pressure using the "PLEXOR" installation are presented. The conducted tests show that Russian gas pressure regulators in the conditions of import substitution are not inferior to foreign analogues in their technical and functional characteristics.

Keywords: gas reduction point, pressure regulator, locking pressure class, diagnostics, setting limits

The issues of seasonal unevenness of gas consumption for the needs of heating, ventilation and hot water supply of the shopping and leisure complex are considered. Calculations of volumetric and power indicators of uneven gas consumption for 2020-2022 are given according to the data of the archive of gas consumption meters.

Keywords: gas consumption, uneven gas consumption, volume, capacity indicators, shopping center

The work of the FL200AN300+TR regulators installed in the hydraulic fracturing plant No. 4 in Volgograd is considered. The results of calculations of the throughput capacity of pressure regulators are presented. The range of their stable operation is determined on the basis of archival data of the gas flow metering unit. It was revealed that not all outlets provide stable operation of pressure regulators with minimal gas consumption.

Keywords: head gas control point, pressure regulator, throughput, range of stable operation

The problem of choosing the most optimal gas supply scheme for rural settlements is considered, taking into account technical and economic criteria. For example x. Knyazhensky-1, Mikhailovsky district of the Volgograd region, several gas supply schemes are proposed. The feasibility study of the choice of one of the possible options is given. It was found that for rural settlements with an extended form, the most optimal is a scheme with two sources of gas supply and a reserving jumper between them.

Keywords: gas distribution network, gas reduction points, hydraulic regime, normalized pressure, cost, construction and installation works

The problem of removal of combustion products during the reconstruction of existing boiler houses is considered. The issue of determining pressure losses due to friction in steel and brick gas ducts when performing an aerodynamic calculation of gas ducts from gas-fired boilers is considered. Nomograms have been developed that make it possible to determine the specific pressure loss depending on the volume of flue gases and the diameter of the gas ducts.

Keywords: reconstruction, boiler units, aerodynamic calculation, friction pressure losses, gas ducts

This article discusses the advantages and perspective for the use of biogas in the conditions of the Republic of Crimea. The ecological and economic aspects of the use of biogas technologies at winemaking enterprises are touched upon. Describes the methods of using biogas at the winery "Massandra" in the Republic of Crimea. The calculation of the use of natural gas in the boiler house of a winery is made. A calculation was made for the use of biogas in a boiler house. It can be concluded that when using biogas in the boiler house of a winery, fuel needs are fully covered. The surplus of the remaining fuel is proposed to be used in a cogeneration plant to generate electricity.

Keywords: biogas, cogeneration plant, grape plant residue, recycling, interchangeability, granulate, natural gas, grapes, thermal energy, electricity, winery

An analysis of the accident rate on gas pipelines is given. Mathematical dependences of the volume of gas entering the atmosphere during the degassing of a gas pipeline section are given. Based on the existing nomogram for determining the gas compressibility factor for main gas pipelines, a nomogram for natural gas transported through gas distribution networks was constructed.

Keywords: gas pipelines, accident rate, degassing, gas bleeding, gas compressibility factor

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