The technical evaluation core of pressure piping components after exposure to fire was performed by considering various factors affecting the pipelines subjected to fire damage, including the determination of material deterioration degree, and the fitness-for-service assessment of the piping equipment. Based on the analysis results and testing data, the safety status and performance loss of the pressure piping after exposure to fire could be obtained. On this view, the influences of fire test and heat exposure as the fire-condition simulation on the grade X70 pipeline steel (API Spec.5L), which was widely used for piping equipment, was carefully investigated. According to the division of fire zone with different factors of temperature and fire suffering preservation, the material micro-structure deterioration and performance degradation were analyzed in detail, after that the grade X70 pipeline steel was heat-treated in muffle furnace to simulate the fire exposure under different conditions of the temperature, heat holding period and cooling mode. In the present foundational research, the mechanical tensile tests, Charpy impact tests, hardness measurements and the metallographic examinations were then conducted in detail. Thus, the data accumulation of performance degradation was believed to benefit to the fitness-for-service assessment of piping components of the grade X70 pipeline steel. Moreover, the material thermal degradation mechanism and the fitness-for-service assessment process of the grade X70 pipeline steel after exposure to fire was further discussed.
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ASME 2017 Pressure Vessels and Piping Conference
July 16–20, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5791-5
PROCEEDINGS PAPER
Fitness-for-Service Assessment on Pressure Piping of Grade X70 Pipeline Steel (API Spec.5L) After Exposure to Fire
Yantian Zuo,
Yantian Zuo
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
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Bo Li,
Bo Li
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
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Wenhua Shu,
Wenhua Shu
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
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Xiaoying Tang
Xiaoying Tang
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
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Yantian Zuo
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
Bo Li
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
Wenhua Shu
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
Xiaoying Tang
Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai, China
Paper No:
PVP2017-65282, V01BT01A026; 6 pages
Published Online:
October 26, 2017
Citation
Zuo, Y, Li, B, Shu, W, & Tang, X. "Fitness-for-Service Assessment on Pressure Piping of Grade X70 Pipeline Steel (API Spec.5L) After Exposure to Fire." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 1B: Codes and Standards. Waikoloa, Hawaii, USA. July 16–20, 2017. V01BT01A026. ASME. https://doi.org/10.1115/PVP2017-65282
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