Experimental and numerical evaluation of the impact of folds on the pressure rating of CIPP liners

Jaganathan, Arun P.; Allouche, Erez N.; Baumert, Michael

doi:10.1016/j.tust.2006.11.007

Cited by 31 publications

(4 citation statements)

References 3 publications

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“…resin not bonding the liner and pipeposes a potential risk. Other issues include folds in the liner fabric, (which cause difficulty during service reinstatement and affect the pressure capability of the rehabilitated pipe), cap/connection misalignment, and resin penetration through the plug causing blocking ( Jaganathan et al 2007). Water mains have hundreds of service connections providing water to households and buildings.…”

Section: Risks and Challengesmentioning

confidence: 99%

Current water main rehabilitation practice using trenchless technology

Kang

Nojumi

et al. 2021

Water Practice and Technology

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The market for water infrastructure rehabilitation is growing rapidly due to the increasing age of underground utilities. Currently, two common water main rehabilitation methods exist: cured-in-place pipe (CIPP) and polymer spray-on coatings. CIPP can provide structural support for both internal and external loads, while spray-on techniques provide chemical resistance as well as adding minor strength to the existing pipe. This paper summarizes water main rehabilitation practice using CIPP and spray-on methods. The history of trenchless rehabilitation technology is discussed, as well as current methodologies and products for water mains. The design, installation, and monitoring of water main rehabilitation products are also summarized, along with the associated risks. Quality assurance and control (QA/QC) methods are included for evaluating existing products and procedures.

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Section: Risks and Challengesmentioning

confidence: 99%

Current water main rehabilitation practice using trenchless technology

Kang

Nojumi

et al. 2021

Water Practice and Technology

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“…CIPP linings have been used since 1971 but improvements have been made continuously over the years [5]. These improvements are driven by the need to stay competitive in the rehabilitating lining industry.…”

Section: Focus On Cured-in-place Pipe (Cipp) Liningsmentioning

confidence: 99%

Numerical analysis of stresses for cured-in-place-pipe linings

Chuk¹,

Urgessa²,

Thippeswamy³

2011

WIT Transactions on the Built Environment

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Underground pipes, such as water supply pipes and sewer pipes, are subjected to reduced strength and cracking due to aging. In order to combat strength reductions, excavation technologies have been used widely that allow replacing existing pipes with new pipes. However, these methods require road closures, traffic regulation and repaving. Various non-excavation (trenchless) repairs have been used in the last twenty years. This paper presents numerical analysis methods of stresses for pipes rehabilitated with cured-in-place-pipe (CIPP) linings. A CIPP lining is the common name given to the installation of a resin impregnated tube into a deteriorated pipe and curing it in place to produce a new structural pipe within a pipe. Examples of different liner types and their effect on reducing pipe wall stresses are presented.

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“…Such an approach is fully justified in the case of using close-fit linings. In paper [17], the influence of the corrugations of a lining that was installed in a cast iron pipeline was analysed. These types of irregularities occur at the stage of execution and often cause problems in the further trouble-free operation of the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Laboratory tests and analysis of CIPP epoxy resin internal liners used in pipelines – part II: comparative analysis with the use of the FEM and engineering algorithms

Abel

2021

Studia Geotechnica Et Mechanica

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In the case of underground network infrastructure it can be seen that objects functioning in the second technical condition, according to DWA-ATV 143-2, and subjected to rehabilitation with the use of close-fit trenchless technologies are capable of withstanding external loads. The main external load that is taken into account in engineering calculations in the case of conduits in the second technical condition is external groundwater pressure. In order to compare design parameters obtained with the use of various calculation methods, a comparative analysis was conducted in order to determine the values of critical pressure. The calculations were carried out using popular engineering algorithms. In addition, analyses using the Finite Element Method and Abaqus software as a computational tool were carried out for the purpose of verifying laboratory tests. This paper aims to broaden knowledge concerning the possibility of performing control numerical analyses for close-fit liners installed in pipelines that are in the second technical condition according to DWA-ATV 143-2. The analyses were carried out on ten 3D models. The models were parameterized in order to reflect the CIPP samples in the most accurate way. The computational models were built based on assumptions, which are commonly used in this type of scientific analysis, regarding material parameters and their interactions. The direct value of the performed engineering calculations and numerical analyses is the extension of knowledge in the field of strength parameters that are obtained by various material groups of close-fit liners. Comparative analysis of the results of laboratory tests and numerical analyses, and the conclusions that result from them, constitute the basis for the optimization of the design process and the individual approach to issues related to the use of liners that strengthen underground pipelines.

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Experimental and numerical evaluation of the impact of folds on the pressure rating of CIPP liners

Cited by 31 publications

References 3 publications

Current water main rehabilitation practice using trenchless technology

Current water main rehabilitation practice using trenchless technology

Numerical analysis of stresses for cured-in-place-pipe linings

Laboratory tests and analysis of CIPP epoxy resin internal liners used in pipelines – part II: comparative analysis with the use of the FEM and engineering algorithms

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