Estimation of improved productivity based on materials substitution in high temperature applications. use of alloy ASTM A-335 P91

  • J. A. SERNA Ecopetrol S.A. – Instituto Colombiano del Petróleo, A.A. 4185 Bucaramanga, Santander, Colombia
  • W. AFANADOR Corporación para la Investigación de Materiales - CIMA
Keywords: modified 9Cr-1, Mosteel P91, high temperature, materials selection, productivity


In Ecopetrol-ICP was carried out an evaluation of the mechanical and microstructural properties of modified 9G--1 Mo alloy, ASTM A-335 Gr. P91, finding higher strength mechanical properties, allowable stresses and creep rupture strenght, than the conventional 9Cr-1 Mo alloy, ASTM A-335 Gr. P9, recommending the alloy P91 as substitute tube material in the radiation zone of the Visbreaking heater of Cartagena's Refinery (furnace in revamping process). The results obtained permit a thickness reduction of radiation tubes of material P91 close to 25% and increase the internal volume tube over up 8%, which is a parameter to consider in improving productivity and efficiency process. Also would be obtained a significant savings cost in the material among 5 and 1 0%. Additionally, expectations of both design and remaining useful life would be seen extensively favored with this change of alloy.


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How to Cite
SERNA, J. A., & AFANADOR, W. (2001). Estimation of improved productivity based on materials substitution in high temperature applications. use of alloy ASTM A-335 P91. CT&F - Ciencia, Tecnología Y Futuro, 2(2), 125–135.


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