On the effect of narrow and long corrosion defects on the collapse pressure of pipelines

Netto, Theodoro Antoun

doi:10.1016/j.apor.2009.07.004

Cited by 72 publications

(12 citation statements)

References 11 publications

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“…The model was subsequently modified and used to study thickness imperfections that were axially or circumferentially uniform. Subsequently, Netto [14] added eight experiments on long tubes with D/tffi24.3 in which external grooves of 181 angular span and lengths that varied from 2D to 6D were machined. The collapse of these tubes with 3-D grooves were simulated numerically with success.…”

Section: Introductionmentioning

confidence: 99%

Collapse of partially corroded or worn pipe under external pressure

Sakakibara

Kyriakides

Corona

2008

International Journal of Mechanical Sciences

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Section: Introductionmentioning

confidence: 99%

Collapse of partially corroded or worn pipe under external pressure

Sakakibara

Kyriakides

Corona

2008

International Journal of Mechanical Sciences

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“…Though, hydrate formation has been established to be a nightmare to the oil and gas industry, (Ribeiro and Lage, 2008;Turner et al, 2009 ), corrosion is of higher consequences because, apart from its abilities to collapse the pipeline system like hydrate (Gbaruko et al, 2007;Netto et al, 2007;Netto, 2009), corrosion is bound to deteriorate the integrity of the pipe and cause it to be replaced entirely (Shipilov and May, 2006;Adib et al, 2007). Generally, the resulting consequences can be broadly classified as economic, environmental and human.…”

Section: Consequences Of the Resulting Corrosion(s)mentioning

confidence: 99%

Hydrate Formation and its Influence on Natural Gas Pipeline Internal Corrosion Rate

2010

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Hydrate formation along the natural gas pipeline has been identified as a serious threat to the survival of oil and gas industry. The formation if not quickly removed may plug the flowline to collapse the system. This problem costs the industry billions of dollars in revenue loss annually. While all the available literatures on hydrate formation process have focused on its ability to plug the flow line, there has been little or no recognition of its ability to initiate internal corrosion of the pipeline which is a bigger problem to the industry, hence, the importance of this study. This work focuses on this new area for research interest aimed at revolutionalizing the field of corrosion science and technology. In this study, the composition of the lattice which includes methane (CH 4 ), carbondioxide (CO 2 ) or hydrogen sulphide (H 2 S) and water molecules (H 2 O) amongst others is considered. These gases have the ability to easily undergo chemical and/or electrochemical reactions with the pipeline's internal surface while the lattice is in place. The reaction(s) will easily initiating corrosion of the pipe. The study further identifies the fact that even after the successful removal of the hydrate, the initiated corrosion process may continue with the continuous flow of the fluid within the pipeline thereby leading to gradual degradation of the material and deterioration of the pipe's integrity. Over time, the pipeline will begin to leak and/or may undergo full bore rupture (FBR). This, apart from the economic consequences will also generate environmental and political consequences and may lead to complete replacement of the pipe-length. Various management schemes including the necessity for the industry to heavily invest in research and development are recommended.

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“…Sakakibara et al 7 studied the effect of internal corrosion defects on collapse behavior by carrying out experiments (internal rectangular grooves were machined by a numerically controlled wire electric discharge machine) and 3D finite element analyses on SS304 tubes and found 50% collapse pressure reduction with corrosion depth reaching 50% of original wall thickness. Netto et al 8,9 investigated the collapse pressure of pipes with pit-type and long narrow-type defects and formulated empirical prediction formulas. A comparison study between the experimental results by Sakakibara et al 7 and the derived formulas 8,9 was carried out by Netto 10 and showed very good prediction ability of the formula for estimation of collapse pressure for narrow but long grooves.…”

Section: Introductionmentioning

confidence: 99%

Collapse of corroded pipes under external pressure considering corrosion asymmetry, non-uniformity, and initial ovality

Yan

Tang

Chen

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper presents an analytical investigation of elastic collapse of corroded pipes considering the corrosion asymmetry, non-uniformity and initial ovality and one novelty is that corrosion asymmetry effect is considered by introducing a misalignment parameter accounting for co-existing internal corrosion and external corrosion. Governing differential equations are derived including the effect of corrosion asymmetry, initial ovality and membrane extensibility. By perturbative techniques, the interaction between corrosion asymmetry and initial ovality is extensively discussed by explicitly calculating the critical initial ovality governing the mode shape changes during initial deformation and collapse deformation phase. One novelty is the introduction of mode shape [Formula: see text] and mode shape 8 characterized by the sign of sum of displacements of two points independent of rigid-body motion. The theoretical solution is agreeing well with the FEA results. Furthermore, for general non-uniform corrosion, unconditionally convergent power series solutions are formulated by Lyapunov artificial small parameter method. By using Holder’s inequality, an explicit estimation method of the needed truncation number is presented for good computation accuracy by a minimization process over Holder’s exponent thus enabling early truncation of the series properly in advance. An improved estimation method is proposed by coupling with Rayleigh quotient techniques and the domain interval partition approach is introduced to accelerate convergence by thoroughly discussing the special uniformly corroded case by mathematical arguments. As a novelty, this paper illustrates why this improvement might be not evident when corrosion is rather narrow theoretically. Finally by using Chebyshev polynomials and the mathematical algebraic ring structure (generated by polynomial and trigonometric functions) closed under addition, multiplication and integration operations, some calculations for rings with corrosion profile in a non-polynomial mode are presented. This paper is intending to enhance the understanding of the effect of corrosion defect on collapse of pipes under external pressure in offshore industry.

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On the effect of narrow and long corrosion defects on the collapse pressure of pipelines

Cited by 72 publications

References 11 publications

Collapse of partially corroded or worn pipe under external pressure

Collapse of partially corroded or worn pipe under external pressure

Hydrate Formation and its Influence on Natural Gas Pipeline Internal Corrosion Rate

Collapse of corroded pipes under external pressure considering corrosion asymmetry, non-uniformity, and initial ovality

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