As the U.S. fleet of fossil power plants age, utilities are forced to perform more and more repairs on such components as turbine casings, main and reheat piping, headers, and other components that have experienced high-temperature degradation. This paper presents information from two surveys on the weld repair technologies currently used by utilities and repair organizations to extend the life of high-temperature, high-pressure components. The initial survey included responses from 28 EPRI member utilities on various repair issues ranging from condition assessment to preheat/postweld heat treat to filler metals employed. The second survey was forwarded to repair vendors and OEMs to gain their perspective on utility industry repairs.

Issue Section:
Technical Papers
Keywords:
steam turbines, power plants, ageing, pressure vessels, heating, high-pressure techniques, high-pressure effects
Topics:
Maintenance, Pipes, Public utilities, Steam turbines
1.
Gandy, D. W., Viswanathan, R., and Findlan, S. J., State-of-the-Art Weld Repair Technology for High Temperature and Pressure Parts, EPRI Report TR-103592, Vols. 1–7.
2.
Gandy, D. W. and Findlan, S. J., 1996, State-of-the-Art Weld Repair Technology for High Temperature and Pressure Parts: Turbine Casing, Piping, and Header Utility Survey, Vendor Survey, and Bibliography, EPRI Report TR-103592, Vol. 3, Nov. 1996.
3.
ASME Boiler and Pressure Vessel Code, Section IX, Welding and Brazing.
Copyright © 2001
 by ASME
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