French RSE-M and RCC-MR code appendices for flaw analysis: Presentation of the fracture parameters calculation—Part IV: Cracked elbows

Marie, Stéphane; Chapuliot, S.; Kayser, Y.; Lacire, M.H.; Drubay, B.; Barthelet, B.; Delliou, Patrick Le; Rougier, Viviana Carolina; Naudin, C.; Gilles, Philippe; Triay, M.

doi:10.1016/j.ijpvp.2007.05.006

Cited by 21 publications

(6 citation statements)

References 4 publications

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“…For each case with available FE J results, elastic uncracked-body stress analysis is carried out using the elbow elastic nominal stress calculation method proposed by Marie et al (2007) to determine the required model loads for the local limit load model and the local limit load based reference stress, 𝜎 ref , is evaluated from Eqn. (13).…”

Section: Comparison Of J Values Between Fe and Predictions With Various Limit Loadsmentioning

confidence: 99%

J Predictions for Defective Pipe Elbows Via the Reference Stress Method

Lei

Budden

2022

Journal of Pressure Vessel Technology

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In R6, the J-based failure assessment diagram (FAD) method is used in the fracture assessment, and is underpinned by the reference stress J scheme. Therefore, an assessment using the R6 FAD method is equivalent to a J prediction using the reference stress method. In this paper, the effect of global and local limit load solutions for defective elbows on the reference stress and hence the J predictions is investigated using published three dimensional elastic-plastic finite element (FE) J results, in order to create guidance for users to follow when performing structural integrity assessments of defective elbows using the R6 procedure. The results show that using the global limit load solutions recommended in this paper can lead to good and reasonably conservative J predictions. However, the availability of global limit load solutions is very limited. The results also show that using the local limit load evaluated from the local limit load model recommended in this paper can lead to conservative J predictions for most of the cases considered.

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Section: Comparison Of J Values Between Fe and Predictions With Various Limit Loadsmentioning

confidence: 99%

J Predictions for Defective Pipe Elbows Via the Reference Stress Method

Lei

Budden

2022

Journal of Pressure Vessel Technology

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“…In some instances it may be found that in order to meet the geometric limits a relatively large thickness is required (i.e. approaching or exceeding the nominal thickness) and hence alternative reference stress solutions should be considered, such as the use of the RSE-M approach [7].…”

Section: Plastic Collapsementioning

confidence: 99%

Effective Outage Planning and Implementation for Nuclear Power Plants in the UK

Reece-Barkell¹,

Vorster

2015

Volume 7: Operations, Applications and Components

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Effective outage planning and implementation is critical to the efficient and safe operation of commercial nuclear power plants in the UK. Statutory outages are necessary for refuelling, for preventive and corrective maintenance when shutdown conditions are required, and for major modification and improvement projects. Outages involve the support of many companies and individuals working together and, as such, require high levels of coordination. Planning of activities before the outage is critical to the overall success of the outage. Establishing the integrity of power plant piping and pressure vessels is a key objective as part of any outage and the methodology and processes involved are the subject of this paper. Establishing the integrity of piping and pressure vessels requires an understanding of the specific threats, their relationship to the overall condition of the system, and the mitigating measures required to assure safe operation. Understanding the specific threats allows the engineering function of an organisation to advise on pipework and pressure vessel ‘Minimum Acceptable Thicknesses’ which can be used to assure integrity via comparison with thicknesses measured during outage inspections. Minimum Acceptable Thicknesses should be recorded in the outage management documentation so they are accessible during the outage implementation phase. Historically a variety of different methodologies have been used to advise on Minimum Acceptable Thickness requirements including design drawing specified minimum thicknesses, design code based required thicknesses and thicknesses calculated based on Fitness for Purpose methods. It is important that a robust procedure be applied to promote consistency of approach as regards the calculation of pipework and pressure vessel Minimum Acceptable Thickness requirements across all power station assets. An additional consideration is that of ensuring that the approach adopted is consistent with high level safety case guidance, i.e., the assessment is appropriate for the failure tolerability of the plant item. This paper provides an overview of the strategy, methodologies and processes employed to determine Minimum Acceptable Thicknesses for pipework components. These ensure that, over a specified inspection interval, were the weld/component to be defect free, it would not fail due to any of the relevant failure mechanisms, which typically are plastic collapse, creep rupture, fatigue, incremental collapse (ratcheting) or buckling. Readers of this paper will gain a valuable insight into the statutory outage process applicable to nuclear power plants in the UK. A particular focus of this paper is on the structural integrity assessments applied in a non-traditional sense prior to, during and after the statutory outage. As well as sharing a valuable insight into the assessment methodologies this paper highlights best industrial practice.

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“…Nowadays, numerous studies of the dynamics of the movement of single-phase, multiphase flows in the shaped elements of pipeline systems, their erosive wear, stress state is small are presented in publications, and, mainly, they relate to water pipelines and pneumatic pipelines of small diameters. The geometric shape of defects in all analytical, numerical studies of the stress state of defective shaped elements [22][23] is extremely simplified (idealized to spherical or rectangular) and does not correspond to the real geometric shape of such defects.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Erosion Wear and Strength of Main Gas Pipelines Bends

Doroshenko

Galyna

Yuliia

et al. 2021

Strojnícky Časopis - Journal of Mechanical Engineering

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The purpose of this work is to ensuring the strength of main gas pipelines bends by studying the peculiarities of single-phase and multiphase flows movement through the internal cavity, the processes of erosion wear and the wall stress state. The problem of synergistic influence of gas-dynamic processes (uneven pressure distribution in the internal cavity), temperature difference and erosion wear on the stress state of the bends of main gas pipelines was solved by numerical simulation. Based on the results of simulation the processes of bends erosion wear, an algorithm for three-dimensional simulation of bend walls erosion defects was developed. The complex three-dimensional geometric shape of the erosion defects of the bend wall varied according to the rate of erosion wear process. This algorithm made it possible to determine the regularities for the influence of the bend erosion defects magnitude on bends stress state. It was established that considering the maximum depth of bend erosion defects 9.6 mm, 10.5 mm and 11.9 mm, the equivalent stresses in the deepest places of the erosion defect were greater than on the concave side of the bend and in straight sections of the pipeline.

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French RSE-M and RCC-MR code appendices for flaw analysis: Presentation of the fracture parameters calculation—Part IV: Cracked elbows

Cited by 21 publications

References 4 publications

J Predictions for Defective Pipe Elbows Via the Reference Stress Method

J Predictions for Defective Pipe Elbows Via the Reference Stress Method

Effective Outage Planning and Implementation for Nuclear Power Plants in the UK

Numerical Study on Erosion Wear and Strength of Main Gas Pipelines Bends

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