Numerical modeling of stresses relaxation phenomena in the complex assembly steel pipe/three layers polyethylene coating

Diodjo, M.R. Tchoquessi; Joliff, Y.; Bélec, L.; Aragon, E.; Perrin, F.X.; Bonnaudet, M.; Lanarde, L.

doi:10.1016/j.porgcoat.2016.12.013

Cited by 6 publications

(7 citation statements)

References 24 publications

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“…An exemplar of such cases is sequential water absorption/desorption, which can develop internal stresses in the coating profile. This eventually leads to adhesion loss or microcracks in the final stage of degradation [ 211 , 212 ]. UV exposure also causes loss of mechanical properties and thereby lowers the durability of the coating [ 213 ].…”

Section: Coating Imperfections and Remaining Life Assessmentsmentioning

confidence: 99%

A Critical Review of the Time-Dependent Performance of Polymeric Pipeline Coatings: Focus on Hydration of Epoxy-Based Coatings

Zargarnezhad

Asselin

Wong³

et al. 2021

Polymers

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The barrier performance of organic coatings is a direct function of mass transport and long-term stability of the polymeric structure. A predictive assessment of the protective coating cannot be conducted a priori of degradation effects on transport. Epoxy-based powder coatings are an attractive class of coatings for pipelines and other structures because application processing times are low and residual stresses between polymer layers are reduced. However, water ingress into the polymeric network of these coatings is of particular interest due to associated competitive sorption and plasticization effects. This review examines common analytical techniques for identifying parameters involved in transport in wet environments and underscores the gaps in the literature for the evaluation of the long-term performance of such coating systems. Studies have shown that the extent of polymer hydration has a major impact on gas and ion permeability/selectivity. Thus, transport analyses based only on micropore filling (i.e., adsorption) by water molecules are inadequate. Combinatorial entropy of the glassy epoxy and water vapor mixture not only affects the mechanism of membrane plasticization, but also changes the sorption kinetics of gas permeation and causes a partial gas immobility in the system. However, diffusivity, defined as the product of a kinetic mobility parameter and a concentration-dependent thermodynamic parameter, can eventually become favorable for gas transport at elevated temperatures, meaning that increasing gas pressure can decrease selectivity of the membrane for gas permeation. On the other hand, reverse osmosis membranes have shown that salt permeation is sensitive to, among other variables, water content in the polymer and a fundamental attribute in ionic diffusion is the effective size of hydrated ions. In addition, external electron sources—e.g., cathodic protection potentials for pipeline structures—can alter the kinetics of this transport as the tendency of ions to dissociate increases due to electrostatic forces. Focusing primarily on epoxy-based powder coatings, this review demonstrates that service parameters such as humidity, temperature, and concentration of aggressive species can dynamically develop different transport mechanisms, each at the expense of others. Although multilayered coating systems decrease moisture ingress and the consequences of environmental exposure, this survey shows that demands for extreme operating conditions can pose new challenges for coating materials and sparse data on transport properties would limit analysis of the remaining life of the system. This knowledge gap impedes the prediction of the likelihood of coating and, consequently, infrastructure failures.

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Section: Coating Imperfections and Remaining Life Assessmentsmentioning

confidence: 99%

A Critical Review of the Time-Dependent Performance of Polymeric Pipeline Coatings: Focus on Hydration of Epoxy-Based Coatings

Zargarnezhad

Asselin

Wong³

et al. 2021

Polymers

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show abstract

“…Three temperature conditions are imposed on the internal surface of the metal cylinder in contact with the gas (red line in Figure 3) and on the top surface coating in contact with the soil (yellow line in Figure 3). A perfect contact (Tied -green lines in ABAQUS TM software was then used to determine the parameters of Prony series using a non linear least square method to fit properly experimental relaxation curves [16].…”

Section: Numerical Model (Finite Element Methods -Fem)mentioning

confidence: 99%

“…This type of pipeline is mainly dedicated to American market. The second type of pipeline coating, used for the European market, is based on a three-layers system that associates a primer epoxy layer (Fusion Bonded Epoxy FBE), an adhesive polyethylene layer (PE Adhesive) and a polyethylene topcoat (PE Topcoat) [16]. The role of the FBE layer is to ensure an excellent adhesion between the steel substrate and the PE layer.…”

Section: Introductionmentioning

confidence: 99%

“…During the storage, the stress level will decrease due to the relaxation of the coating (Figure 2). After one year of storage, the residual stress at the steel/FBE interface (3MPa) is higher than the residual stress at the FBE/PE interface (2 MPa) [16]. year of storage at ambient air [16] If a residual stress is well identified at the steel/coating interface, its intensity cannot explain the damage observed on the pipeline.…”

mentioning

confidence: 98%

“…After one year of storage, the residual stress at the steel/FBE interface (3MPa) is higher than the residual stress at the FBE/PE interface (2 MPa) [16]. year of storage at ambient air [16] If a residual stress is well identified at the steel/coating interface, its intensity cannot explain the damage observed on the pipeline. A possible cause of this disbonding could come from the coupling between this internal stress due to the process and the stress generated in operation (temperature and pressure).…”

mentioning

confidence: 98%

See 2 more Smart Citations

Stress evolution in multilayer polymer coating under thermal and pressure loading applied to the pipeline structure

Diodjo

Joliff

Bélec

et al. 2021

International Journal of Pressure Vessels and Piping

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Numerical study on the evaluation of thermal and mechanical stresses during the welding of coated pipelines

Bélec

Joliff

2017

Progress in Organic Coatings

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Numerical modeling of stresses relaxation phenomena in the complex assembly steel pipe/three layers polyethylene coating

Cited by 6 publications

References 24 publications

A Critical Review of the Time-Dependent Performance of Polymeric Pipeline Coatings: Focus on Hydration of Epoxy-Based Coatings

A Critical Review of the Time-Dependent Performance of Polymeric Pipeline Coatings: Focus on Hydration of Epoxy-Based Coatings

Stress evolution in multilayer polymer coating under thermal and pressure loading applied to the pipeline structure

Numerical study on the evaluation of thermal and mechanical stresses during the welding of coated pipelines

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