Life Management of High-Temperature Piping and Tubing in Fossil Power Plants

[+] Author and Article Information
R. Viswanathan

Electric Power Research Institute, 3412 Hillview Avenue, Palo Alto, CA 94304-1395

J. Pressure Vessel Technol 122(3), 305-316 (Apr 05, 2000) (12 pages) doi:10.1115/1.556187 History: Received February 01, 2000; Revised April 05, 2000
Copyright © 2000 by ASME
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Schematic illustration of an elevated temperature header
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Four types of damage in girth welds in relation to microstructure 5
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Micrograph showing creep crack initiation at a cusp in the weld followed by propagation along the fusion line towards the inside diameter of a seam-welded hot reheat pipe
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Creep life assessment based on cavity classification 15
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Correlation between damage classification and expected creep-life fraction for 1-1/4Cr-1/2 Mo steel
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Graphical summary of the best-fit TTT curves for various weld HAZ graphitization levels 21
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Example of “ligament cracking” at the tube borehole of a high-temperature header
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Photomicrograph (500) of the oxide notch at the ligament cracks
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Expended life fraction under service conditions versus the remaining life fraction as determined from post-exposure accelerated tests for three heats of steel 3335
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2-1/4Cr-1Mo rupture data showing UTS dependence 2335
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Creep-crack-growth-rate for the base metal of the 2-1/4Cr-1Mo steel plate at 538°C (1000°F) obtained using miniature specimens 37
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Comparison of scatterbands from all available ex-service HAZ/FL




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