<?xml version="1.0" encoding="ISO-8859-1"?><article 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">
<front>
<journal-meta>
<journal-id>2071-0054</journal-id>
<journal-title><![CDATA[Revista Ciencias Técnicas Agropecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cie Téc Agr]]></abbrev-journal-title>
<issn>2071-0054</issn>
<publisher>
<publisher-name><![CDATA[Universidad Agraria de La Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2071-00542020000100007</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Influence of Temperature in Sandwich Pipes Subjected to High Pressures]]></article-title>
<article-title xml:lang="es"><![CDATA[Influencia de la temperatura en ductos compuestos sometidos a altas presiones]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Valdés]]></surname>
<given-names><![CDATA[Dayvis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez Hernández]]></surname>
<given-names><![CDATA[Alberto Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortega-Herrera]]></surname>
<given-names><![CDATA[José Angel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Machado Molina]]></surname>
<given-names><![CDATA[Minelkis]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ocampo Ramirez]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional SEPI-ESIME ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Lloyds Register  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Agraria de La Habana Facultad de Ciencias Técnicas ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Unidad de Simulación e Ingeniería Mecánica Estructural - GrupoSSC  ]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2020</year>
</pub-date>
<volume>29</volume>
<numero>1</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2071-00542020000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2071-00542020000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2071-00542020000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Nowadays, there is a great global development of infrastructure for the extraction, exploitation and transport of hydrocarbons in deep-waters, due to the decrease of existing resources in shallow waters. The objective of this research is to propose a sandwich pipe with thermal insulation, capable to operate in deep water under the effect of the thermal gradient that occurs at these depths and flow assurance guaranteeing. This is also of great importance in agriculture for irrigation with groundwater, where it is necessary to guarantee the structural integrity of the pipelines that transport the fluid through land where high pressures and high temperatures may exist. Therefore, 4 sandwich pipes were analyzed in finite elements, considering high fluid temperatures and low seawater temperatures, as well as variations in the annular material (cement and polypropylene) and the thicknesses. It was obtained that the greater the thickness the lower the stiffness of the system. However, the thermal effect does not significantly influence the resistance of the pipes with greater core thickness, due to the thermal insulation offered by the annular material. The sandwich pipe with cement annular material offers greater potential to be implemented as it presented greater collapse pressure than the pipe with polypropylene.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN A nivel mundial se está presentando un gran desarrollo de infraestructura para la extracción, explotación y transporte de hidrocarburos en aguas profundas, debido a la disminución de los recursos existentes en aguas poco profundas. El objetivo de esta investigación se centra en poder proponer un ducto compuesto dotado de aislamiento térmico, capaz de operar en aguas profundas bajo el efecto del gradiente térmico que se produce a estas profundidades y garantizando el aseguramiento del flujo. Esto es de gran importancia también en la agricultura para el riego con aguas subterráneas, donde es necesario garantizar la integridad estructural de los ductos que transportan el fluido por terrenos en donde pueden existir altas presiones y altas temperaturas. Por lo que se analizaron en elementos finitos 4 ductos compuestos, teniendo en cuenta las altas temperaturas del fluido y las bajas temperaturas del agua de mar, así como variaciones en el material anular (cemento y polipropileno) y los espesores. Se obtuvo que a mayor espesor disminuye la rigidez del sistema. Sin embargo, el efecto térmico no influye significativamente en la resistencia de los ductos con mayor espesor del material anular, producto del aislamiento térmico que ofrece el material anular. El ducto compuesto con material anular de cemento ofrece mayor potencial para ser implementado ya que presentó mayor presión de colapso que el ducto con polipropileno.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[sandwich pipe]]></kwd>
<kwd lng="en"><![CDATA[thermal gradient]]></kwd>
<kwd lng="en"><![CDATA[finite elements]]></kwd>
<kwd lng="es"><![CDATA[ducto compuesto]]></kwd>
<kwd lng="es"><![CDATA[gradiente térmico]]></kwd>
<kwd lng="es"><![CDATA[elemento finito]]></kwd>
</kwd-group>
</article-meta>
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