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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">energy</journal-id><journal-title-group><journal-title xml:lang="ru">Энергетика. Известия высших учебных заведений и энергетических объединений СНГ</journal-title><trans-title-group xml:lang="en"><trans-title>ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1029-7448</issn><issn pub-type="epub">2414-0341</issn><publisher><publisher-name>BNTU</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.21122/1029-7448-2024-67-6-544-577</article-id><article-id custom-type="elpub" pub-id-type="custom">energy-2426</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>ТЕПЛОЭНЕРГЕТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>НEAT POWER ENGINEERING</subject></subj-group></article-categories><title-group><article-title>Анализ фактического состояния предызолированных трубопроводов систем централизованного тепло-снабжения после эксплуатации</article-title><trans-title-group xml:lang="en"><trans-title>Аnalysis of the Actual Condition of Pre-Insulated Pipelines of District Heating Systems After Operation</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>Седнин</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sednin</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>г. Минск</p></bio><bio xml:lang="en"><p>Minsk</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>Седнин</surname><given-names>А. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Sednin</surname><given-names>A. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Адрес для переписки:Седнин Алексей Владимирович –Белорусский национальный технический университет,просп. Независимости, 65/2,220013, г. Минск, Республика Беларусь.Тел.: +375 17 397-36-20Sednin@bntu.by</p></bio><bio xml:lang="en"><p>Address for correspondence:Sednin Alexei V. –Belarusian National Technical University,65, Nezavistimosti Ave.220013, Minsk, Republic of Belarus.Tel.: +375 17 397-36-20Sednin@bntu.by </p></bio><email xlink:type="simple">Sednin@bntu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бондарович</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Bondarovich</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>г. Минск</p></bio><bio xml:lang="en"><p>Minsk</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>Некало</surname><given-names>И. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Nekalo</surname><given-names>I. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>г. Минск</p></bio><bio xml:lang="en"><p>Minsk</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>Мухин</surname><given-names>А. Д.</given-names></name><name name-style="western" xml:lang="en"><surname>Mukhin</surname><given-names>A. D.</given-names></name></name-alternatives><bio xml:lang="ru"><p>г. Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский национальный технический университет</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Belarusian National Technical University</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>04</day><month>12</month><year>2024</year></pub-date><volume>67</volume><issue>6</issue><fpage>544</fpage><lpage>577</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Седнин В.А., Седнин А.В., Бондарович А.И., Некало И.А., Мухин А.Д., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Седнин В.А., Седнин А.В., Бондарович А.И., Некало И.А., Мухин А.Д.</copyright-holder><copyright-holder xml:lang="en">Sednin V.A., Sednin A.V., Bondarovich A.I., Nekalo I.A., Mukhin A.D.</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://energy.bntu.by/jour/article/view/2426">https://energy.bntu.by/jour/article/view/2426</self-uri><abstract><p>В статье рассматриваются вопросы, связанные с фактическим состоянием предызолированных (ПИ) трубопроводов систем централизованного теплоснабжения (СЦТ). Часть из находящихся в эксплуатации трубопроводов подходит к расчетному сроку службы, поэтому актуальным является вопрос их дальнейшего использования. Старение трубопроводов СЦТ происходит вследствие различных процессов, связанных как с температурными режимами работы, так и с окислением кислородом. Долговечность полимерных материалов ПИ-труб можно оценить с помощью эмпирического или прогнозного способа. Для шести партий ПИ-труб, находившихся разное время в эксплуатации в СЦТ г. Минска, были проведены испытания по нормируемым параметрам с целью определения их фактических значений. Для большинства представленных образцов величины среднего размера ячеек, плотности термоизоляции, напряжения при деформации сжатия и количества закрытых пор в значительной мере соответствуют требованиям СТБ 2252–2012 для новых труб. Значение коэффициента теплопроводности находится в пределах 0,030–0,037 Вт/(м·К), что на 10 % выше требуемого показателя для новых труб. Значения предела прочности конструкции  ПИ-трубы на сдвиг во многих испытаниях составили меньше 0,12 МПа, что говорит о потенциально возможном разрушении теплоизоляционной конструкции трубы. При этом отсутствует определенная зависимость как от срока эксплуатации труб, так и от температурного режима.</p></abstract><trans-abstract xml:lang="en"><p>The article discusses issues related to the actual condition of pre-insulated (PI) pipelines of district heating systems (DHS). Some of the pipelines in operation are approaching their estimated service life, so the issue of their further use is relevant. The aging of the heating supply pipelines occurs due to various processes associated with both operating temperature regimes and oxidation. The durability of polymer materials used in pre-insulated pipes can be assessed through empirical or predictive methods. For six batches of PI pipes that were in operation at different times in the Minsk DHS, tests were carried out according to standardized parameters in order to determine their actual values. For most of the samples presented, the values of the average cell size, thermal insulation density, compression strain stress and the number of closed pores significantly meet the requirements of STB 2252–2012 for new pipes. The value of the thermal conductivity coefficient is in the range of 0.030 to 0.037 W/(m·K), which is 10 % higher than the required value for new pipes. Values of the shear strength limit of the pre-insulated pipe construction  in many tests was less than 0.12 MPa, indicating a potential risk of failure in the thermal insulation structure of the pipe. Besides, there is no specific correlation with either the service life of the pipes or the temperature regime.</p><p> </p></trans-abstract><kwd-group xml:lang="ru"><kwd>теплоснабжение</kwd><kwd>предызолированные трубы</kwd><kwd>пенополиуретан</kwd><kwd>срок службы</kwd><kwd>старение</kwd><kwd>предел прочности на сдвиг</kwd></kwd-group><kwd-group xml:lang="en"><kwd>district heating system</kwd><kwd>pre-insulated pipes</kwd><kwd>polyurethane foam</kwd><kwd>service life</kwd><kwd>degradation</kwd><kwd>axial shear strength</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">Future Distric Theating Systems and Technologies: On the Role of Smart Energy Systems and 4th Generation District Heating / H. Lund [et al.] // Energy. 2018. Vol. 165. P. 614–619. https://doi.org/10.1016/j.energy.2018.09.115.</mixed-citation><mixed-citation xml:lang="en">Lund H., Duic N., Østergaard P. 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