Material properties for fracture mechanics based strength assessment of cast iron water mains

Published on Jan 1, 2021in Canadian Journal of Civil Engineering0.985
· DOI :10.1139/CJCE-2019-0229
Suborno Debnath1
Estimated H-index: 1
,
Ismail Muftah Ali1
Estimated H-index: 1
(MUN: Memorial University of Newfoundland)
+ 1 AuthorsPremkumar Thodi8
Estimated H-index: 8
(St. John's University)
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Abstract
Municipal water distribution systems in Canada and other countries include a large number of cast iron pipes that were installed almost 50 years ago. For structural integrity assessment of these pi...
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References26
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#1Bipul Chandra Mondal (MUN: Memorial University of Newfoundland)H-Index: 5
#2Ashutosh Sutra Dhar (MUN: Memorial University of Newfoundland)H-Index: 9
Abstract In the conventional method of analysis for the remaining strength assessment of a corroded pipeline, von Mises failure criterion is used. This continuum-based modelling approach is unable to assess the cracking of the pipeline. In this study, a fracture mechanics approach is used for the assessments of burst pressures of pipelines with corrosion only defects, pipelines with crack-like defects and pipelines with crack-in-corrosion defects. The fracture mechanics approach with the J-integ...
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Pipelines are extensively used as the most economic means of transporting oil and gas. The steel pipelines have been widely used for these applications due to the high strength to weight ratio of the material, resulting in lower material cost. These pipelines are subjected to corrosions during the service life, resulting in the reduction of wall thicknesses. The prediction of the remaining strength of a corroded pipeline is required for fitness-for-purpose assessment. For the prediction of the r...
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#1Weigang Wang (RMIT: RMIT University)H-Index: 5
#2Chun-Qing Li (RMIT: RMIT University)H-Index: 10
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A review of published literature on the corrosion of metal pipes reveals that current research on corrosion of full-size pipe sections in real soil conditions is highly limited, with almost no research reported on the corrosion effect on degradation of mechanical properties, and fracture toughness in particular, of cast iron pipes buried in real soil. This paper presents a new testing methodology for investigating the corrosion of cast iron pipes in real soil and evaluating its effect on the deg...
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#1Kasuni T. H. Liyanage (MUN: Memorial University of Newfoundland)H-Index: 2
#2Ashutosh Sutra Dhar (MUN: Memorial University of Newfoundland)H-Index: 9
A number of water main breaks occur every year in municipalities due to ageing, aggressive environmental conditions and undesirable soil conditions. However, the failure mechanism observed in cast iron water mains is often obscure. Non-uniform soil support conditions resulting from the erosion of the surrounding soil by the water escaping from leaks may induce excessive stresses on the pipe wall. Due to partial erosion of backfill soil or the presence of large rock pieces, the localised point su...
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#1Weigang Wang (RMIT: RMIT University)H-Index: 5
#2Annan Zhou (RMIT: RMIT University)H-Index: 30
Last. Mojtaba Mahmoodian (RMIT: RMIT University)H-Index: 11
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Abstract Underground pipes are essential infrastructure for water, oil and gas transport. The presence of localized pitting corrosion has been identified as one of the main deterioration mechanisms for metal pipes, which, when exposed to external loadings, can easily fail due to intensified stresses at the corrosion pit. The assessment of such an intensified stress field around the pit has been a key focus for decades since it is a major mode of pipe failures. Although stress intensity factors f...
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AbstractCircumferential cracking or ring fracture has been identified as the most common type of failure mode for cast-iron water mains. However, the cause of circumferential cracking in water main...
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#1Chunshun Zhang (Monash University, Clayton campus)H-Index: 13
#2Suranji Rathnayaka (Monash University, Clayton campus)H-Index: 7
Last. Jayantha Kodikara (Monash University, Clayton campus)H-Index: 30
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Abstract Pitting/patch corrosion is a major and common cause of leaks and (or) bursts in cast iron (CI) pipes that consist of over 50% of global pipelines. The determination of the remaining life of a CI pipe is a major challenge facing water utilities requiring an estimate of the impact of pitting corrosion on the degradation of structural pipe capacity. This paper uses an efficient finite element analysis (FEA) to model the behaviour of large diameter CI pipes with natural or simulated corrosi...
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#1Ismail AliH-Index: 1
Cast iron is one of the most commonly used materials for municipal water mains. Although cast iron pipes are no longer used for new water mains, a significant portion of existing water mains are still cast iron. These aged cast iron pipes are undergoing deterioration and are susceptible to leakage and breakage. In this thesis, a deteriorating cast water main is investigated to understand the failure mechanism and to determine the mechanical properties of the material as a tool for the structural...
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#1Chunshun Zhang (Monash University, Clayton campus)H-Index: 13
#2Jian Ji (Monash University, Clayton campus)H-Index: 25
Last. Balvant RajaniH-Index: 24
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Abstract Cast iron (CI) pipes were widely installed as water mains and service connections in the last century and still large numbers of CI pipes remain in service. However, many CI pipes are becoming aged and severely corroded, causing frequent pipe leaks and breaks. To better understand the failure mechanism of CI pipes, this paper provides an efficient numerical approach to analyse the behaviour of CI pipes under various loading conditions. The numerical investigation was realised by impleme...
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#1Jian Ji (Monash University)H-Index: 25
#1Jian Ji (Monash University)H-Index: 14
Last. Jayantha Kodikara (Monash University)H-Index: 30
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Cast iron was the dominant material for buried pipes for water networks prior to the 1970s in Australia and overseas. At present, many water utilities still have a significant amount of ageing cast iron pipes. Cast iron is a brittle material and when large diameter cast iron pipes (diameters above 300 mm) further deteriorate, the consequences of failure can be substantial. Focusing on the likelihood of failure to assist risk assessment, this paper examines the performance of large-diameter cast ...
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#1Atika Hossain Akhi (MUN: Memorial University of Newfoundland)
#2Ashutosh Sutra Dhar (MUN: Memorial University of Newfoundland)H-Index: 9
Abstract The municipal water distribution systems across the world include a significant amount of cast-iron pipes. Many of the buried cast-iron pipes are over fifty years old and require rehabilitation. Municipalities decide on a rehabilitation solution between the replacement and re-use of the existing pipes based on the remaining strengths of the pipes. Fracture mechanics has appeared as the most viable tool for remaining strength assessment of the deteriorating pipes. However, a method of as...
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