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Research of Fatigue Crack Growth Behavior of X70 Pipeline Steel in Corrosive Environment and Evaluation of Defect

[+] Author Affiliations
Jing Wang, Xiao-yang Li

Beijing University of Technology, Beijing, China

Shu-rui Li

Wuhan Iron and Steel (Group) Corp, Wuhan, Hubei, China

Paper No. PVP2010-25518, pp. 455-462; 8 pages
doi:10.1115/PVP2010-25518
From:
  • ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference
  • ASME 2010 Pressure Vessels and Piping Conference: Volume 5
  • Bellevue, Washington, USA, July 18–22, 2010
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 978-0-7918-4924-8 | eISBN: 978-0-7918-3878-5
  • Copyright © 2010 by ASME

abstract

Long distance pipeline transmission is considered to be the most economic and safest method to transport natural gas nowadays and pipeline safety problem is a focus of concern in the academic and industrial circles. Pressure fluctuation and corrosive environment can make the typical working condition of long distance pipeline become a low frequency corrosion fatigue condition, which leads to high risk. In this paper, mathematic model of fatigue crack growth rate (FCGR) considering frequency and stress ratio has been developed and the expressions of every parameter were fitted. Critical stress intensity factor (KISCC ) in H2 S saturated environment (2300ppm) was measured. In view of the operating condition and applied stress of pipeline, low frequency, high stress ratio corrosion fatigue tests of X70 base metal were carried out in H2 S saturated and air environments respectively. According to the ASME BPVC Section XI, by using inverse inferring method, considering critical crack sizes of H2 S stress corrosion cracking, crack increments of corrosion fatigue and different service periods, allowable crack sizes of different service period were calculated and the curves between allowable crack depth and original crack length were obtained, which would supply more accurate data to determine the service period and to evaluate West-East natural gas transmission pipeline’s residual life.

Copyright © 2010 by ASME

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