Resumo

SERNA, J. A  e  AFANADOR, W. ESTIMATION OF IMPROVED PRODUCTIVITY BASED ON MATERIALS SUBSTITUTION IN HIGH TEMPERATURE APPLICATIONS. USE OF ALLOY ASTM A-335 P91. C.T.F Cienc. Tecnol. Futuro [online]. 2001, vol.2, n.2, pp.125-135. ISSN 0122-5383.

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.

Palavras-chave : modified 9Cr-1 Mosteel P91; high temperature; materials selection; productivity.

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