Abstract
The technical and economic aspects of improving the hydraulic efficiency of pipeline transmission are considered. Hydraulic efficiency of gas transmission systems reveals directly their economic efficiency and practicability, as well as the process of "aging" of the main gas pipelines over time. One of the effective methods of improving the hydraulic efficiency of a gas pipeline is its periodical cleaning with the use mechanical cleaning units. The process of cleaning gas transmission systems with cleaning pistons is technologically complicated and expensive. Therefore, when planning, it is necessary to create all the conditions that guarantee maximum cleaning efficiency and are costeffective. The increase of the number of gas pipeline cleanings improves the hydraulic effi-ciency of the systems. It increases the profit of gas transmission organizations. As a result, the cost for cleaning goes up and leads to the decrease of profit of the gas transportation companies. Therefore, the number of clean-ings of gas pipelines and gas transmission systems should be equal to the optimum number of cleanings over a period of time. The indices of economic efficiency of gas pipelines pigging are analyzed. The authors find that a more specific indicator of the evaluation of gas pipeline cleaning procedure is the increase in the total profit of the gas transmission company. The dependence of the gas transmission company profit on the number of gas pipe-line cleaning over a certain period of time is investigated. The method of specifying the optimal periodicity of gas transmission systems cleaning is offered. The mathematical model of the process is constructed. On the basis of the model, a transcendental equation for finding the optimal number of gas transportation system cleanings for a certain lifetime is obtained. A grapho-analytical method for the solution of the equation is offered. Based on the calculations, a graphical dependence of the optimal periodicity of gas transmission systems cleaning is constructed.
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