In this study, an inner pressure/bending creep test on a circumferentially welded large diameter 9Cr steel pipe was conducted at a temperature of 650°C to investigate the creep damage mechanism and applicability of nondestructive evaluation techniques to the detection of creep damage. The test was interrupted before steam leakage based on a change in axial strain at the surface of the welded joint. Surface cracks were observed at the lower part of the specimen along the circumferentially welded joint where axial tensile stress was applied. As a result of phased array ultrasonic inspection, indications of internal defects were first detected along welded joints where the failure life ratio was 54% with the range of indication increasing with test time. The indications of internal defects were in good agreement with observations of sectional views in welded joints.
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ASME 2016 Pressure Vessels and Piping Conference
July 17–21, 2016
Vancouver, British Columbia, Canada
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5042-8
PROCEEDINGS PAPER
Inner Pressure/Bending Creep Test on Circumferentially Welded Large Diameter Pipe of Grade 91 Steel: Creep Damage Mechanism and Applicability of NDE
Satoshi Nishinoiri,
Satoshi Nishinoiri
Central Research Institute of Electric Power Industry, Yokosuka, Japan
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Yukio Takahashi,
Yukio Takahashi
Central Research Institute of Electric Power Industry, Yokosuka, Japan
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Hiroyuki Fukutomi,
Hiroyuki Fukutomi
Central Research Institute of Electric Power Industry, Yokosuka, Japan
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Masatsugu Yaguchi
Masatsugu Yaguchi
Central Research Institute of Electric Power Industry, Yokosuka, Japan
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Satoshi Nishinoiri
Central Research Institute of Electric Power Industry, Yokosuka, Japan
Yukio Takahashi
Central Research Institute of Electric Power Industry, Yokosuka, Japan
Hiroyuki Fukutomi
Central Research Institute of Electric Power Industry, Yokosuka, Japan
Masatsugu Yaguchi
Central Research Institute of Electric Power Industry, Yokosuka, Japan
Paper No:
PVP2016-63176, V06AT06A053; 7 pages
Published Online:
December 1, 2016
Citation
Nishinoiri, S, Takahashi, Y, Fukutomi, H, & Yaguchi, M. "Inner Pressure/Bending Creep Test on Circumferentially Welded Large Diameter Pipe of Grade 91 Steel: Creep Damage Mechanism and Applicability of NDE." Proceedings of the ASME 2016 Pressure Vessels and Piping Conference. Volume 6A: Materials and Fabrication. Vancouver, British Columbia, Canada. July 17–21, 2016. V06AT06A053. ASME. https://doi.org/10.1115/PVP2016-63176
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