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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">energsecurity</journal-id><journal-title-group><journal-title xml:lang="ru">Надежность и безопасность энергетики</journal-title><trans-title-group xml:lang="en"><trans-title>Safety and Reliability of Power Industry</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1999-5555</issn><issn pub-type="epub">2542-2057</issn><publisher><publisher-name>ООО «НПО Энергобезопасность»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.24223/1999-5555-2021-14-4-174-179</article-id><article-id custom-type="elpub" pub-id-type="custom">energsecurity-780</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОБЩИЕ ВОПРОСЫ НАДЕЖНОСТИ И БЕЗОПАСНОСТИ ЭНЕРГЕТИКИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>GENERAL ISSUES RELATED TO RELIABILITY AND SAFETY OF THE POWER INDUSTRY</subject></subj-group></article-categories><title-group><article-title>Определение оптимального срока замены трубопроводов</article-title><trans-title-group xml:lang="en"><trans-title>Determination of the optimal period for replacement of pipelines</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Колосов</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kolosov</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>пр. Свободный, 79, 660041, г. Красноярск</p></bio><bio xml:lang="en"><p>79 Svobodny pr., 660041 Krasnoyarsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Липовка</surname><given-names>Ю. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Lipovka</surname><given-names>Yu. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>пр. Свободный, 79, 660041, г. Красноярск</p></bio><bio xml:lang="en"><p>79 Svobodny pr., 660041 Krasnoyarsk</p></bio><email xlink:type="simple">ipovka.j.l@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГАОУ ВО «Сибирский федеральный университет»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Siberian Federal University</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>27</day><month>01</month><year>2022</year></pub-date><volume>14</volume><issue>4</issue><fpage>174</fpage><lpage>179</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Колосов М.В., Липовка Ю.Л., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Колосов М.В., Липовка Ю.Л.</copyright-holder><copyright-holder xml:lang="en">Kolosov M.V., Lipovka Y.L.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.sigma08.ru/jour/article/view/780">https://www.sigma08.ru/jour/article/view/780</self-uri><abstract><p>Цель. Создание и апробация алгоритма поиска мест оптимальной замены участков тепловой сети системы централизованного теплоснабжения для поддержания нормативных значений безотказной работы при минимуме финансовых затрат.Методы. Для проведения компьютерного моделирования использованы математические методы расчета потокораспределения в разветвленных и закольцованных теплогидравлических цепях. Разработана системная модель тепловой сети с указанием параметров, используемых при построении функции минимальных затрат, и методика определения мест замены трубопроводов тепловой сети для подержания показателя безотказной работы выше нормативного.Результаты. Предложен алгоритм для реализации принципа повышения надежности сетей централизованного теплоснабжения посредством разработки системной модели тепловой сети. При использовании методики получен график оптимальной замены трубопроводов для рассматриваемого участка в течение последующих 30 лет. Показано, что предложенный комплексный метод качественной и количественной оценки работоспособности сетей централизованного теплоснабжения позволяет выявлять показатель безотказной работы, который может быть выше нормативного для всего промежутка времени. Установлено, что оптимальные сроки замены отдельных участков тепловых сетей обусловлены варьированием входных параметров тепловой сети: года прокладки трубопроводов данной системы, года, на который производится расчет, диаметра трубопровода и его длины, вида прокладки трубопровода и района расположения, и выходными параметрами — затратами на поддержание системы и вероятности безотказной работы системы.Заключение. По полученным результатам рекомендован комплексный метод оценки стоимости поддержания работоспособности сетей централизованного теплоснабжения. Показано, что предложенный метод позволяет улучшить качество управленческих решений для обеспечения безотказной работы системы теплоснабжения. В дальнейшем планируется разработка методических рекомендаций по использованию предлагаемого метода при разработке раздела надежности и живучести перспективных схем теплоснабжения городов и населенных пунктов.</p></abstract><trans-abstract xml:lang="en"><p>The goal is to create and test an algorithm for finding places for the optimal replacement of sections of the heating network of the district heating system to maintain the standard values of trouble-free operation with a minimum of financial costs.Methods. To carry out computer modeling, mathematical methods were used to calculate the flow distribution in branched and looped thermal-hydraulic circuits. A systemic model of the heating network with an indication of the parameters used in the construction of the function of minimum costs, and a method for determining the places of replacement of pipelines of the heating network to maintain the indicator of failure-free operation above the standard have been developed.Results. An algorithm is proposed to implement the principle of increasing the reliability of district heating networks through the development of a system model of a heating network. As a result of using the technique, a schedule for the optimal replacement of pipelines for the area under consideration over the next 30 years was obtained. It is shown that the proposed complex method of qualitative and quantitative assessment of the efficiency of district heating networks allows one to identify an indicator of failure-free operation, which may be higher than the standard for the entire period of time. It has been established that the optimal timing for replacing individual sections of heating networks is due to the variation of the input parameters of the heating network: the year of laying the pipelines of this system, the year for which the calculation is made, the diameter of the pipeline and its length, the type of pipeline laying and the area of its location, and the output parameters — the costs of maintaining system and the likelihood of system uptime.Conclusion. Based on the results obtained, a comprehensive method for assessing the cost of maintaining the operability of district heating networks is recommended. It is shown that the proposed method improves the quality of management decisions to ensure trouble-free operation of the heat supply system. In the future, it is planned to develop guidelines for the use of the proposed method in the development of a section of reliability and survivability of promising heat supply schemes for cities and towns.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>тепловая сеть</kwd><kwd>износ трубопроводов</kwd><kwd>оптимизация</kwd><kwd>вероятность безотказной работы</kwd><kwd>математическое моделирование</kwd><kwd>надежность теплоснабжения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heating network</kwd><kwd>pipeline wear</kwd><kwd>optimization</kwd><kwd>probability of failure-free operation</kwd><kwd>mathematical modeling</kwd><kwd>reliability of heat supply</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Кирюхин С. Н., Сеннова Е. В., Шиманская А. О. 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