Fatigue life assessment of damaged pipelines under cyclic internal pressure: Pipelines with longitudinal and transverse plain dents

Pinheiro, Bianca; Pasqualino, Ilson Paranhos; Cunha, Sérgio B.

doi:10.1016/j.ijfatigue.2014.06.003

Cited by 23 publications

(9 citation statements)

References 11 publications

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“…11(b). It is also noticeable in specimen H1A that the tangent strains to the periphery of the dent are compressive whereas their perpendicular counterparts are always positive [19]. In more detail, the gauge on the longitudinal plane, GR1 records a tensile strain in the axial direction whilst the gauge on the transverse plane, GR4, records a compressive strain in the axial direction.…”

Section: Strain Behaviour In Case a (Without Liner)mentioning

confidence: 87%

Mechanical response of a lined pipe under dynamic impact

Obeid

Alfano

Bahai

et al. 2018

Engineering Failure Analysis

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An experimental and numerical investigation on the mechanical response of a lined pipe (compound pipe) under a dynamic impact is presented. The influence of the impact energy has been studied in terms of the depth of the dent formed, and of the strains and residual stresses. To this end, a three-dimensional explicit dynamic non-linear finite element model has been developed and successfully validated against the results of impact-test experiments conducted on pipes made of AISI 10305 steel, with and without the AISI304 stainless steel liner. The validation was made by comparing numerically computed strains with those measured by strain gauges, as well as in terms of permanent deformation. The model is then utilized to evaluate the residual stresses, the amount of energy dissipation and the velocity of impact process as a function of different pipes (i.e. with or without liner) and of the free drop heights.

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Section: Strain Behaviour In Case a (Without Liner)mentioning

confidence: 87%

Mechanical response of a lined pipe under dynamic impact

Obeid

Alfano

Bahai

et al. 2018

Engineering Failure Analysis

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“…Pipe denting strongly influence pipeline's strength and fatigue life; therefore, the topic was addressed by researchers in the past [2] and [3] and is still attractive today [4] to [6]. The solutions to the problem are in the form of a pure theoretic analysis [2], or as guides extracted from recapitulation of many experiments [3], or, recently, from experiments supplemented with numerical analyses [4] to [6]. All researchers agree that the excessive size of the dent, the abrupt change of the dented surface curvature and the pre-existing pipe damage on the dent spot severely lessen pipe strength and fatigue life.…”

Section: Introductionmentioning

confidence: 99%

An Exacting Wall-Penetration Pipe Analysis

Koc¹

2019

SV-JME

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Conventional analysis methods for piping systems have incorporated many conservative assumptions. Some of these assumptions can be abandoned by employing advanced analyses, thus allowing for higher loads, which can lead to further uprating of the system without physically intervening with it. This paper shows the procedure of uprating the design seismic load of an existing pipeline through advanced analyses. First, it was discovered that the seal between the pipe and the wall in fact represents a support which is even stiffer than an engineered, purposely built support. Secondly, analyses demonstrate that a pipeline built of thin wall pipes can sustain significant lateral deformation (ovalization and indentation), imposed by seismically induced relative displacements between the buried pipe and building wall penetration, without breaching the pipe wall. This finding is supported by the fact that the pipe passed the flattening test. In the pipeline qualification procedure, the stress state in the dented pipe wall is compared with the stress state during the flattening test. All relevant stress indicators (stress intensities) at the uprated loading state were smaller than allowed by the applicable code or obtained from the flattening test; thus, the pipeline qualified for uprated seismic conditions.

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“…However, in practical applications, fatigue is a main failure mode for gas transmission pipes because of the wave loading caused by daily fluctuations in pressure, such as working pressure, that stop and start during the operation [12,13]. Fatigue properties are some of the main requirements for evaluating the integrity of a pipeline [14].…”

Section: Introductionmentioning

confidence: 99%

Low‐Cycle Fatigue Properties of the X70 High‐Frequency Electric‐Resistant Welded Pipes

Tian

et al. 2018

Advances in Materials Science and Engineering

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The strength, toughness, corrosion, and fatigue resistance are the main requirements for evaluating the integrity of a pipeline. In this study, the tensile strength, impact toughness, and fatigue properties of the pipe body and weld joint of an X70 high-frequency electric-resistant welded (HFW) pipe were measured and the effects of microstructure and surface defects at weld joint on properties were discussed. Results show the appearance of a weakened zone at the weld joint of the X70 HFW pipe. Nevertheless, all mechanical properties, including strength and impact energy, were superior to the specified values of the API specifications for the X70 line pipe. The reduced strength, toughness, and resistance to S-N fatigue of the weld joint caused the microstructural coarsening at the weld junction zone. However, for the specimens without surface finishing, the resistance to S-N fatigue for the weld joint was further reduced. This phenomenon was mainly attributed to the burring defects and microstructural coarsening at the heat-affected zone (HAZ). Therefore, to improve the quality of the X70 HFW pipe, refining the microstructure of weld joint and reducing the deburring defects by optimizing the postweld heat treatment (PWHT) and deburring processes should be firstly considered in the future research works.

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Fatigue life assessment of damaged pipelines under cyclic internal pressure: Pipelines with longitudinal and transverse plain dents

Cited by 23 publications

References 11 publications

Mechanical response of a lined pipe under dynamic impact

Mechanical response of a lined pipe under dynamic impact

An Exacting Wall-Penetration Pipe Analysis

Low‐Cycle Fatigue Properties of the X70 High‐Frequency Electric‐Resistant Welded Pipes

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