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Technical Brief

Fitness for Service Assessment on Local Metal Loss Near a Discontinuity Using Elastic-Plastic Stress Analysis

[+] Author and Article Information
Zhanghai (John) Wang

Mem. ASME
Jacobs Engineering,
5995 Rogerdale Road,
Houston, TX 77072
 e-mail: john.wang@jacobs.com,
wangzh2k@gmail.com

Samuel Rodriguez

Lyondell Chemical Company,
Channelview Complex,
8280 Sheldon Road,
Channelview, TX 77530 
e-mail: samuel.rodriguez2@lyondellbasell.com

1Author previously worked at BP Texas City Refinery as a Senior Equipment Integrity Engineer.

2Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 24, 2012; final manuscript received November 1, 2013; published online January 7, 2014. Assoc. Editor: Haofeng Chen.

J. Pressure Vessel Technol 136(2), 024501 (Jan 07, 2014) (3 pages) Paper No: PVT-12-1105; doi: 10.1115/1.4025927 History: Received July 24, 2012; Revised November 01, 2013

In fitness for service (FFS) assessments, one issue that people often encounter is a corroded area near a structural discontinuity. In this case, the formula-based sections of the FFS standard are incapable of evaluating the component without resorting to finite element analysis (FEA). In this paper, an FEA-based technical approach for evaluating FFS assessments using an elastic-plastic material model and reformed criteria is proposed.

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References

API/ASME, 2007, Fitness-for-Service, 579-1/ASME FFS-1, American Petroleum Institute and American Society of Mechanical Engineers, Washington, DC.
Konosu, S., Kano, M., Mukaimachia, N., Komura, H., and Takada, H., 2009, “Plastic Collapse Load for Vessel With External Flaw Simultaneously Subjected to Internal Pressure and External Bending Moment—Experimental and FEA Results,” ASME J. Pressure Vessel Technol., 131(2), p. 021206. [CrossRef]
Mukaimachia, N., and Konosub, S., 2009, “Plastic Collapse Assessment Procedure for Vessels With Deep Local Thin Area Subjected to Internal Pressure,” Nucl. Eng. Des., 239, pp. 1171–1179. [CrossRef]
Jroslav, M., 2005, “Review, Finite Elements in Analysis of Pressure Vessels and Piping, as Addendum: Bibliography (2001–2004),” Int. J. Pressure Vessels Piping, 82, pp. 571–592. [CrossRef]
Bubenik, T. A., Olson, R. J., Stephens, D. R., and Francini, R. B., 1992, “Analyzing the Pressure Strength of Corroded Line Pipe,” Battelle Memorial Institute, Columbus, OH.
Mok, D. H. B., Pick, R. J., Glover, A. G., and Hoff, R., 1991, “Bursting of Line Pipe With Long External Corrosion,” Int. J. Pressure Vessels Piping, 46, pp. 195–216. [CrossRef]
ASME2011Section VIII, Division 1, American Society of Mechanical Engineers, 2010, New York.
ASME2011Section VIII, Division 2, American Society of Mechanical Engineers, 2010, New York.

Figures

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Fig. 1

Exampled tower E-630

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Fig. 2

Wall thickness 3D contour

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Fig. 3

Contour of inspection data mapped on shell

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Fig. 4

Plastic stress–strain curve for material SA 516-70 at 350 °F

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Fig. 5

F(B,C) versus internal pressure

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Fig. 6

Surface contour of F(B,C) under 169.3 psig

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