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

Jacobs Engineering,
5995 Rogerdale Road,
Houston, TX 77072
 e-mail: john.wang@jacobs.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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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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