Fatigue life prediction for an API 5L X42 natural gas pipeline

Hong, Suk Woo; Koo, Jae Mean; Seok, Chang-Sung; Kim, Jae Won; Kim, Joon Ho; Hong, Seong Kyeong

doi:10.1016/j.engfailanal.2014.12.016

Cited by 13 publications

(6 citation statements)

References 10 publications

(9 reference statements)

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“…Table 3 illustrates the fatigue test datum of several specimens of 16Mn with remanufactured welding seams. The fatigue life obeys the Weibull distribution therefore the shape parameter of the welding seam takes 3 as shown in Table 4 through looking up to the Weibull distribution [19]. In Table 4, S T is the coefficient of test specimen, S R is the reliability coefficient, S C is the confidence coefficient.…”

Section: The Corrected S-n Curvementioning

confidence: 99%

Fatigue Models Based on Real Load Spectra and Corrected S-N Curve for Estimating the Residual Service Life of the Remanufactured Excavator Beam

Zhao

Xiao

Zhou

2021

Metals

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To more accurately predict the residual fatigue cycles and estimate the service life of the remanufactured excavator, the fatigue models integrating the corrected S-N curve, the RFC algorithm, the FEA model, and the mechanism dynamic model are established depending on the real load spectra under experimental working conditions and the corrected S-N curve of the beam metal remanufactured with the welding process. Depending on the test data of the unidirectional stress history and the servo displacements of the major cylinders, the mechanism dynamic model was first established to illustrate the real load spectra applied on the pivots of the working beam. The load spectra are further used in the finite element analysis (FEA) model to obtain the stress contours of the beam relevant to the sampling time, which is the stress spectra at any nodes on the beam in theory. Subsequently, the rain flow counting (RFC) algorithm based on the dual parameters of the cyclic stress amplitude and mean is established to provide the frequency spectra in the longevity region on the beam. Furthermore, due to the fatigue property changes of the beam metal remanufactured with the welding process, its S-N curve is corrected based on the detail fatigue rating (DFR) method to compute the stress cycles at each stress level on the crisis nodes. Finally, the total stress cycles that can be burdened by the remanufactured beam is computed under the Miner’s linear fatigue cumulative criterion. The total number of stress cycles is eventually converted to the fatigue and service life depending on the proportion of the sampling time under relevant working conditions. The results show that integrated fatigue models provide a practical approach to enhancing the accuracy of the estimation on the residual service life of the remanufactured excavator beam. It is significant for improving the reliability and safety of the remanufactured excavator.

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Section: The Corrected S-n Curvementioning

confidence: 99%

Fatigue Models Based on Real Load Spectra and Corrected S-N Curve for Estimating the Residual Service Life of the Remanufactured Excavator Beam

Zhao

Xiao

Zhou

2021

Metals

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“…In general, the stress-life method adopts S-N curves to evaluate fatigue status of pipelines. Most of research work is devoted to the fatigue properties and failure of different pipeline materials by experiments, 18,19 and the S-N curves used in pipeline fatigue design are also specified in the codes of some countries. [20][21][22] These works provide basic references for traffic-load-induced pipeline fatigue assessments.…”

Section: Introductionmentioning

confidence: 99%

Fatigue assessment of buried metal pipelines under traffic loads using video monitoring data

Peng

Wang

et al. 2023

Structural Health Monitoring

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Traffic loads have an important impact on long-term performance of buried urban pipelines due to generation of cyclic stress and fatigue damage. As a key task for pipeline fatigue assessment, the investigation of traffic-induced pipe stress and fatigue load spectrums is always a big challenge. Focusing on the metal pipelines buried under urban intersection, an integrated framework is proposed for fatigue assessment of the pipelines under traffic loads using video monitoring data acquired by the widespread surveillance cameras in cities. The computer vision algorithms and a quarter vehicle model are first employed to identify traffic loads. Analytical pipe-soil models are then developed to calculate pipeline stress and establish the traffic-induced fatigue load spectrums of buried pipelines, based on which the Monte-Carlo simulations are finally conducted to evaluate cumulative fatigue damage and fatigue reliability. A case study on a DN500 steel pipeline buried under an urban intersection demonstrates and validates the fatigue assessment procedure. The results can provide a basis for decision support regarding maintenance and replacement of urban pipelines.

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“…The J-integral is one of among methods to study the behavior of cracks especially semi-elliptical shape which have strong relationship with several factors such as pipeline dimensions, defects type (circumferential, longitudinal), defect size, mechanical characteristics of piping systems, and the limit load of pipeline [46,[50][51][52][53][54]. To study the safety of structure, it can use Failure Assessment Diagram (FAD) which can classify the degree resistance of wall cracks and surface cracks through three zones including: safety, security, and failure [46][47].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

MESSAOUDI

MERIEM-BENZIANE

2022

JMES

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The aim of the project is to study experimentally the influence of the semi-elliptical defect on the steel of grade API 5L X52 pipeline and its reparation by welding operation to keep the safety of hydrocarbons transport network. The tests have been performed on the specimens with/without semi-elliptical defects by using two ratios a/c and a/t, where the defects issue on the piping systems wall is treated by using the welding operation, which focuses on the filling the defected surface as same thickness of the base wall of the pipeline after removing the defects. The decrease of ultimate stress is mainly evident depending on the size of crack, where they compared to the base metal results. The experimental results showed that the reliability of the welding operation is proved especially in the ratio a/c =1, which is similar to that found in automatically welded. It is proved that the ratio a/t = 0.2 curve exhibits similarity to the base metal curve and their elongation conforms to API standard of steel X52 grade. Clearly, corrosion defects cause degradation of mechanical property in the order of 44% to 50% depending on the ratio of 0 < a/c ≤1 and from 20% to 80% according to the second ration of 0 < a/t ≤0.8. The obtained results proved that the enhanced of mechanical properties by welding reaches to ultimate stress is 559 MPa for the ratio a/t = 0.2 and 531 MPa for the ratio a/t = 0.5. Finally, the experimental results provided that the impact of semi-elliptical defect has effects on the safety of piping systems where welding became as one of among solutions to repair the piping systems.

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Fatigue life prediction for an API 5L X42 natural gas pipeline

Cited by 13 publications

References 10 publications

Fatigue Models Based on Real Load Spectra and Corrected S-N Curve for Estimating the Residual Service Life of the Remanufactured Excavator Beam

Fatigue Models Based on Real Load Spectra and Corrected S-N Curve for Estimating the Residual Service Life of the Remanufactured Excavator Beam

Fatigue assessment of buried metal pipelines under traffic loads using video monitoring data

Experimental study of the effects of semi-elliptical defects on the API X52 pipeline and its reparation by welding

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