Optimization of creep properties of welded header-stub tube connection for lif extension

Conference · Tue Dec 31 00:00:00 EST 1996

OSTI ID:549987

Ram, R; Cunningham, G ^[1]; Roberts, B

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1. Tennessee Technological Univ., Cookeville, TN (United States). Center for Electric Power

The failure of boiler tubes is the predominant cause of boiler outages. From a life-extension point of view, the critical components are large diameter thick-wall high-temperature headers. The primary aim of this research is to numerically analyze the stresses in the boiler tube-header weld connection and study the behavior of the material as it creeps. The focus is on the initial thermoelastic stresses at the beginning of operation and the distribution of stresses after approximately twenty years of operation when the stresses have relaxed. The study calculates creep life fractions of the assembly after twenty years of service.

• OSTI ID: 549987
• Report Number(s): CONF-961006-; ISBN 0-7918-1796-2; TRN: IM9753%%62
• Resource Relation: Conference: 1996 international joint power generation conference, Houston, TX (United States), 13-17 Oct 1996; Other Information: PBD: 1996; Related Information: Is Part Of 1996 international joint power generation conference: Proceedings. Volume 2; PWR-Volume 30; Kielasa, L. [ed.] [Detroit Edison Co., MI (United States)]; Weed, G.E. [ed.] [Eastman Kodak Co., Rochester, NY (United States)]; PB: 936 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
20 FOSSIL-FUELED POWER PLANTS
BOILERS
TUBES
STEEL-CR2MO
CREEP
STRESS RELAXATION
SERVICE LIFE