The objective of this Promotion Paper is development of the methods for calculating correct consumption of natural gas and optimum parameters of gas supply distribution systems. To ensure construction of technically as well as economically substantiated systems, it is necessary to develop gas supply layouts – technical solutions with application of correct natural gas consumption measures for estimation of gas supply system parameters (diameter, material, loss of pressure). The drafting of this Paper included study of methods for calculation of natural gas consumption and distribution gas supply systems in gas management facilities in Latvia, Lithuania, Germany, and Russia, as well as analysis of actual load on gas supply systems in Latvia, focusing in particular on analysis of the factors that influence the consumption of natural gas. It has been established that in case of high and medium pressure distribution gas-pipes built in the cities of Latvia before late 90s (basic load pipes) the diameters exceed by 20 – 30% the figures required for present load of natural gas – the maximum hourly consumption (m3/h). It has been demonstrated that increased maximum hourly consumption is used in the relevant calculations without taking into consideration either simultaneous operation of devices of the users of natural gas or the seasonal principle. Diameters of distribution gas-pipes are estimated with minimum loss of pressure, thus the diameter of gas-pipes is notably increased. It is therefore concluded that consumption of natural gas by industrial and agricultural sector is reduced, including consumption by households reduced by 16%, due to increased efficiency factor and power efficiency, as well as demand for consumption of electric power. The Paper includes methods developed for calculation of natural gas distribution system parameters. Procedure for technically economical calculations has been improved due to application of geographic information system (GIS), and calculation of the maximum number of customers on the residential territories has been simplified. Proposals have been drafted for simplification of calculation model of gas supply systems, optimization of the loss of pressure, and the key principles applicable to hydraulic calculations of pipelines have been improved to enable reduction of estimated diameters of high-pressure gas-pipes from 7 to 10%, thus making it possible to save on construction costs of new distribution gas supply systems up to 15%. The results of promotion are used in the standard LVS 417:2011 “Gas distribution and user systems. External gas-pipes and adjustment facilities. Design”, and in the industrial standard LV NS GS 26:2012 “Development of prospective gas supply layout”, as well as for the Bachelor and MA studies in the subject ‘Gas supply systems’ at RTU Heat, Gas and Water Technologies program. Reports on the results of work have been presented at 8 international conferences and reflected in 10 publications.