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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">kaz44</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник Университета Шакарима. Серия технические науки</journal-title><trans-title-group xml:lang="en"><trans-title>Bulletin of Shakarim University. Technical Sciences</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2788-7995</issn><issn pub-type="epub">3006-0524</issn><publisher><publisher-name>«Шәкәрім университеті» КеАҚ</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">kaz44-10</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>ТЕХНИЧЕСКИЕ НАУКИ</subject></subj-group></article-categories><title-group><article-title>К ВОПРОСУ О ДОЛГОВЕЧНОСТИ ТРУБОПРОВОДОВ В ИЗОЛЯЦИИ ИЗ ПЕНОПОЛИУРЕТАНА</article-title><trans-title-group xml:lang="en"><trans-title>REVISITING DURABILITY OF PIPELINES IN POLYURETHANE FOAM INSULATION</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>Калмагамбетова</surname><given-names>А. Ш.</given-names></name><name name-style="western" xml:lang="en"><surname>Kalmagambetova</surname><given-names>A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>к.т.н., доцент кафедры строительных материалов и технологий</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>Богоявленская</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Bogoyavlenskaya</surname><given-names>T.</given-names></name></name-alternatives><bio xml:lang="ru"><p>докторант кафедры строительных материалов и технологий</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Карагандинский государственный технический университет<country>Казахстан</country></aff><aff xml:lang="en">Karaganda State Technical University<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>20</day><month>09</month><year>2020</year></pub-date><volume>0</volume><issue>3(91)</issue><fpage>31</fpage><lpage>34</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Калмагамбетова А.Ш., Богоявленская Т.А., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Калмагамбетова А.Ш., Богоявленская Т.А.</copyright-holder><copyright-holder xml:lang="en">Kalmagambetova A., Bogoyavlenskaya T.</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://tech.vestnik.shakarim.kz/jour/article/view/10">https://tech.vestnik.shakarim.kz/jour/article/view/10</self-uri><abstract><p>В статье приведены результаты исследования трубопровода теплоснабжения из стали с тепловой изоляцией из пенополиуретана в полиэтиленовой оболочке, эксплуатируемого в Казахстане.</p><p>Основной задачей исследования явилось определение срока службы теплопроводов с полимерной оболочкой из полиэтилена низкого давления высокой плотности при температуре до 150°C на основании методик, приведенных в отечественных и зарубежных стандартах.</p><p>Представлен возможный вариант режима работы тепловых сетей по графику температур 130/70°С для города Караганды (Казахстан). Сделаны выводы об увеличении срока эксплуатации трубопроводов в пенополиуретановой тепловой изоляции с защитной оболочкой из полиэтилена низкого давления высокой плотности. Описана зависимость выбора исходных материалов для изоляции и защитной оболочки. Проанализирована надежность систем теплоснабжения, которая напрямую зависит от срока службы теплопроводов.</p></abstract><trans-abstract xml:lang="en"><p>The article presents the results of the study of heat supply pipeline made of steel with thermal insulation of polyurethane foam in polyethylene sheath, operated in Kazakhstan.</p><p>The main objective of the study was to determine the service life of heat pipes with a polymer sheath made of high density polyethylene at temperature up to 150° C based on the methods given in local and foreign standards.</p><p>A possible variant of the operating mode of heating networks according to operation temperature schedule of 130/70° C for the city of Karaganda (Kazakhstan) is presented. Conclusions are drawn about increasing the life of pipelines in polyurethane foam thermal insulation with a protective casing of high-density low-pressure polyethylene. The dependence of the choice of starting materials for insulation and a waterproof casing is described. The reliability of heat supply systems which directly depends on the service life of heat pipes is analyzed.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>тепловые сети</kwd><kwd>полимерные трубы</kwd><kwd>полиэтилен</kwd><kwd>долгосрочная гидростатическая устойчивость</kwd><kwd>срок службы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heat networks</kwd><kwd>polymer pipes</kwd><kwd>polyethylene</kwd><kwd>long-term hydrostatic stability</kwd><kwd>life time</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">Bukhin V.E. 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