A study on the effect of flaw detection probability assumptions on risk reduction achieved by non-destructive inspection

Cronvall, Otso; Simola, Kaisa; Männistö, Ilkka; Gunnars, Jens; Alverlind, L.; Dillström, Peter; Luca, Gandossi

doi:10.1016/j.ress.2012.03.012

Cited by 12 publications

(13 citation statements)

References 2 publications

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“…Figure shows the POD ( a ) curves corresponding to Equations , , and . This study uses curves that are called “user‐defined.” Curves of this type were used by Simola and his collaborators . The user‐defined curves are characterized by two values, the value at which the probability of detection attains a plateau, POD pt , and the corresponding crack size threshold, a th .…”

Section: Overview Of the Structural Reliability Modelmentioning

confidence: 99%

“…With this objective, it is assumed that POD pt is a deterministic variable, while a th is considered a stochastic variable. It should be noted that in prior contributions, a th was considered a deterministic variable …”

Section: Overview Of the Structural Reliability Modelmentioning

confidence: 99%

“…Secondly, the crack is inspected using different NDT process, each characterized by a user‐defined probability of detection curve. This type of curves was used by Simola and his collaborators . In the present work, an extension of the user‐defined probability of detection curve concept is considered.…”

Section: Introductionmentioning

confidence: 99%

“…This type of curves was used by Simola and his collaborators. [5][6][7][8] In the present work, an extension of the user-defined probability of detection curve concept is considered. Estimates of the probability of failure due to fracture and plastic collapse of the cracked pipe are made using the failure assessment diagram (FAD) technique [9][10][11][12] and considering the repair as a "non-perfect process" and not as a "perfect process" as was done previously.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structural reliability assessment of cracked pipes: The role of probability of detection data

Mussini¹,

Cancela²,

Clarke

2018

Fatigue Fract Eng Mat Struct

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The structural reliability of industrial pipes, including those in the nuclear, oil, and gas industries, has a significant impact on the safety of people and the environment. This work aims to develop a computational structural reliability model method in conjunction with the failure assessment diagram method and the user‐defined probability of detection curves of non‐destructive testing are used. The concept of “reliability factor of a repair” is proposed. Then, the effects of the pipe inspection considering different user‐defined probability of detection curves and different values of the reliability factor of a repair on probability of failure are discussed. The main results include the identification of cases where performing repairs do not guarantee an improved reliability, as well as the consequences of considering the repair as a “perfect process” which result in non‐conservative assessments.

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Section: Overview Of the Structural Reliability Modelmentioning

confidence: 99%

Section: Overview Of the Structural Reliability Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural reliability assessment of cracked pipes: The role of probability of detection data

Mussini¹,

Cancela²,

Clarke

2018

Fatigue Fract Eng Mat Struct

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“…The choice of the initial crack size, for fracture mechanics life predictions, is commonly based on the experience of the NDT worker, but this might be questioned for a number of reasons. Detecting defects such as cracks is an "inherently stochastic process" [3]. E.g., in manual testing, a crack might be found by one inspector, but missed by another one or even by the same at another trial.…”

Section: Specification Of Residual Lifetimementioning

confidence: 99%

Non-destructive testing and fracture mechanics: A short discussion

Zerbst¹,

Heckel²,

Carboni³

2016

AIP Conference Proceedings

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A short discussion is provided on the relationship between non-destructive testing and fracture mechanics. The\ud basic tasks behind this are to guarantee the safety of a component at a potential hazard loading event, to specify inspection\ud intervals or, alternatively, of demands on non-destructive testing for a fixed inspection regime, to plan accompanying\ud actions for cases of temporary continued operation of structures in which cracks have been detected, and, finally, fatigue\ud strength considerations which take into account initial defects

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A holistic approach to risk-based decision on inspection and design of fatigue-sensitive structures

Zou

Faber

González

et al. 2020

Engineering Structures

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Design and operation of large welded structural systems (e.g. ship and offshore structures) are challenging due to numerous fatigue-sensitive details, limited available budgets, uncertainties in fatigue damages, inspection & maintenance activities, etc. Traditionally, fatigue design and maintenance planning have been almost disconnected, which restricts coherent decision-making and optimum safety management. Structural design optimization, without quantitatively incorporating the effects of operational maintenance, can hardly result in a structural plan that is optimum in terms of life cycle costs. Also, if the design of a structure is not optimum, maintenance optimization alone cannot yield a really optimum maintenance plan. As operational inspections and maintenance are essential, there are merits to utilize their effects to structural design and meanwhile optimize them at the initial design stage when impacts of decisions are greater. This paper proposes a riskbased approach to holistic decision-making enveloping decisions and uncertainties affecting design, inspection and maintenance of fatigue-sensitive components. Decisions variables in structural scantling and operational maintenance are obtained holistically at the structural design stage by risk based optimization, based on quantitative assessment of the effectiveness of both structural scantling and maintenance interventions. Optimum fatigue reliability level is also obtained, informed by the effects of uncertainties and failure consequences. The method captures combined benefits of structural scantling and operational maintenance to fatigue reliability and risk mitigation and achieves optimum resource utilization and life cycle cost reduction. Advantages of the proposed method have been demonstrated via a numerical example, In comparison to alternative methods.

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A study on the effect of flaw detection probability assumptions on risk reduction achieved by non-destructive inspection

Cited by 12 publications

References 2 publications

Structural reliability assessment of cracked pipes: The role of probability of detection data

Structural reliability assessment of cracked pipes: The role of probability of detection data

Non-destructive testing and fracture mechanics: A short discussion

A holistic approach to risk-based decision on inspection and design of fatigue-sensitive structures

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