Structural Integrity of a Standpipe Component in a Petrochemical Catalytic Cracking Unit: Part 1—Assessment of Creep Rupture Properties

[+] Author and Article Information
Levi de O. Bueno, Luiz Marino

Department of Materials Engineering, Universidade Federal Sao Carlos, Rodovia W. Luiz, km.235, 13565-905 Sao Carlos(SP), Brazil

Flavio A. S. Serra, Fernando T. Gazini

PETROBRAS/REPLAN, Rodovia SP 332, km 132 13.100 Paulinia (SP), Brazil

J. Eng. Mater. Technol 122(3), 264-268 (Mar 07, 2000) (5 pages) doi:10.1115/1.482797 History: Received October 15, 1999; Revised March 07, 2000
Copyright © 2000 by ASME
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Schematic view of the pretrochemical cracking unit
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Heat treatment schedule carried out on the ex-service material to enable welding operation of a new segment of the standpipe component
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(a) Constant strain rate tensile and creep test smooth bar specimens; (b) cross-weld creep test specimens
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Constant rate tensile data for 2 1/4 Cr-1Mo, for virgin and ex-service conditions, according to Watanabe et al. 3
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Minimum creep rate x stress: (a) for the ex-service material at 600, 625, and 650°C; (b) for the other conditions of the material at 600°C; (c) and at 650°C
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Stress x rupture time; (a) for the ex-service material at 600, 625, and 650°C; (b) for the other conditions of the material at 600°C; (c) and at 650°C
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Minimum creep rate versus inverse temperature for isotress tests
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Minimum creep rate versus rupture time data for all conditions of the 2 1/4 Cr-1Mo steel in this work. Also shown scatter band (dotted lines) according to Reference 8
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Variation in stress-rapture strength of 2 1/4 Cr-1Mo steel under different heat-treatment conditions, plotted according to the Larson-Miller parameter, as reported by Viswanathan 12
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Isotress LOG(rupture time) x inverse temperature data for the virgin, ex-service, heat-treated and welded material
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Larson-Miller analysis for the creep results of the standpipe material



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