A Structural Integrity Assessment Methodology for Pressurized Vessels

[+] Author and Article Information
Raymond K. Yee

Mechanical & Aerospace Engineering Department, San Jose State University, One Washington Square, San Jose, CA 95192-0087rkyee@email.sjsu.edu

Mike Kapper

Mechanical & Aerospace Engineering Department, San Jose State University, One Washington Square, San Jose, CA 95192-0087kapper.2@osu.edu

J. Pressure Vessel Technol 128(4), 541-546 (Oct 25, 2005) (6 pages) doi:10.1115/1.2349564 History: Received September 14, 2005; Revised October 25, 2005

Pressurized vessels such as a steam drum in a typical power plant can often experience in-service cracking. Structural integrity assessment methodology can be a useful tool to determine the suitability of a vessel for service. This methodology may include fitness-for-service and remaining useful life analyses of a vessel based on the nondestructive examination (NDE) results and operating conditions. In this paper, the structural integrity assessment methodology applied to a steam drum case study is described. The analysis procedure, material property determination, stress analysis, limiting flaw size evaluation, and remaining useful life evaluation for the drum are discussed. A thermal shock design tool is briefly introduced. Recommendations for appropriate action are also presented. The assessment methodology employed in this paper can be applied to other similar pressurized vessels and structures in power plants.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 1

Fracture mechanics approach (three fracture parameters relationship)

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Figure 2

Schematic of a simple steam power plant

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Figure 3

Schematic showing the surface flaw locations at the inner surface of the steam drum wall

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Figure 4

ASME lower bound fracture toughness curves for ferritic steels (9)

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Figure 5

Hoop stress distribution in the steam drum wall (the symbol ● represents the finite element analysis results)

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Figure 6

Transient hoop stress distribution in the steam drum wall by spreadsheet design tool (horizontal axis at unit 1 represents the inside surface of the drum)

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Figure 7

Failure assessment diagram for a 4.6mm deep by 178mm long inner surface flaw in the steam drum. (The points designated by ∎ represent the vessel with the given flaw size under hydrotest and operating conditions.)

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Figure 8

Fatigue crack growth assessment methodology flow chart

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Figure 9

Fatigue crack depth versus startup/shutdown pressure cycles for the steam drum




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