Analysis of internal corrosion in subsea oil pipeline

Ilman, Mochammad Noer; Kusmono, Kusmono

doi:10.1016/j.csefa.2013.12.003

Cited by 89 publications

(44 citation statements)

References 4 publications

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“…The main advantage of this method is minimal specimen preparation activity due to the fact that the thickness of the specimen does not pose any inluence to the analysis, ultra-high resolution, and 3D resulting appearance of the test object. Various analyses of marine structures and equipment have been conducted using SEM [25][26][27][28], one of them being analysis of speed boat steering wheel fracture, Figure 3.…”

Section: Experimental Toolsmentioning

confidence: 99%

Common Case Studies of Marine Structural Failures

Vukelić¹,

Vizentin²

2017

Failure Analysis and Prevention

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Marine structures are designed with a requirement to have reasonably long and safe operational life with a risk of catastrophic failures reduced to the minimum. Still, in a constant wish for reduced weight structures that can withstand increased loads, failures occur due to one or several following causes: excessive force and/or temperature induced elastic deformation, yielding, fatigue, corrosion, creep, etc. Therefore, it is important to identify threats afecting the integrity of marine structures. In order to understand the causes of failures, structure's load response, failure process, possible consequences and methods to cope with and prevent failures, probably the most suitable way would be reviewing case studies of common failures. Roughly, marine structural failures can be divided into structural failures of ships, propulsion system failures, ofshore structural failure, and marine equipment failures. This book chapter will provide an overview of such failures taking into account failure mechanisms, tools used for failure analysis and critical review of possible improvements in failure analysis techniques.

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Section: Experimental Toolsmentioning

confidence: 99%

Common Case Studies of Marine Structural Failures

Vukelić¹,

Vizentin²

2017

Failure Analysis and Prevention

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“…Crude oil and its products are mixtures of hydrocarbon which by themselves are not corrosive. However, they become corrosive in the presence of impurities and other components such as water, chloride salts, carbon dioxide (CO 2 ), hydrogen sulfide (H 2 S), elemental sulfur, dissolved oxygen, organic acids and sulfate-reducing bacteria (SRB) ( Ref 1,[3][4][5]. Tremendous efforts have been made to mitigate and control the effects of corrosion.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Investigation of the Corrosion Behavior of Proprietary Micro-alloyed Steels in Aerated and Deaerated Brine Solutions

Onyeji

Kale

2017

J. of Materi Eng and Perform

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The corrosion performance of fairly new generation of micro-alloyed steels was compared in different concentrations of aerated and deaerated brines. Electrochemical polarization, weight loss and surface analyses techniques were employed. The results showed a threshold of corrosion rate at 3.5 wt.% NaCl in both aerated and deaerated solutions. The average corrosion current density for steel B, for example, increased from 1.3 lA cm 22 in 1 wt.% NaCl to 1.5 lA cm 22 in 3.5 wt.% NaCl, but decreased to 1.4 lA cm 22 in 10 wt.% deaerated NaCl solutions. The aerated solutions exhibited an average of over 80% increase in corrosion current density in the respective concentrations when compared with the deaerated solution. These results can be attributed to the effects of dissolved oxygen (DO) which has a maximum solubility in 3.5 wt.% NaCl. DO as a depolarizer and electron acceptor in cathodic reactions accelerates anodic metal dissolution. The difference in carbon content and microstructures occasioned by thermomechanical treatment contributed to the witnessed variation in corrosion performance of the steels. Specifically, the results of the various corrosion techniques corroborated each other and showed that the corrosion rate of the micro-alloyed steels can be ranked as CR Steel A < CR X65 < CR Steel B < CR Steel C .

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“…This requires that structural reliability shall be evaluated of these pipes. To date, pipelines are perhaps the most economic and efficient means of large scale fluid transportation for crude oil and natural gas compared to rail, truck, and tanker transportation in terms of flexibility of routes and large quantities to be moved (Ilman and Kusmono 2014). Lifetime management of pipelines is necessary for safe hydrocarbon transmission and distribution systems.…”

Section: Introductionmentioning

confidence: 99%

Determination of extension of life of corroded offshore pipelines using form and monte carlo structural reliability

Nizamani¹,

Mustaffa²,

Wen³

2015

Proceedings of the Second International Conference on Performance-Based and Life-Cycle Structural Engineering (PLSE 2015)

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The evaluation of the structural strength of an offshore pipeline after 25 years of service is an important issue for extending its lifespan. This is an important environmental and economic issue, especially when the pipeline is related to the oil and gas industry. Remaining strength after corrosion effects are included in the performance equation and can be determined by using maximum operating pressure and capacity equations. The results are then compared from burst test results. In this study, Bayesian updating of probability of failure is used to evaluate the updated probability of failure. The performance equations from the two main codes on corrosion used in this study are B31G and DNV-RP-F101 and they are used validate the results. The sensitivity analysis of the variables such as defect depth and thickness is considered in the analysis. This method could be adopted for evaluating the service life extension and evaluation of pipelines working under extreme environments. FORM and Monte Carlo simulations will be used to determine the updated probability of failure. The method could be used for many engineering structures where either practical approaches are not feasible to determine the remaining life of the structure or the uncertainty of the expected results is too high. The evidence concluded in this study could be used by industry to enhance our understanding of the mechanisms for pipeline failure and processes necessary for its preservation.

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Analysis of internal corrosion in subsea oil pipeline

Cited by 89 publications

References 4 publications

Common Case Studies of Marine Structural Failures

Common Case Studies of Marine Structural Failures

Preliminary Investigation of the Corrosion Behavior of Proprietary Micro-alloyed Steels in Aerated and Deaerated Brine Solutions

Determination of extension of life of corroded offshore pipelines using form and monte carlo structural reliability

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