An Analytical Approach for Thermally Induced Axial Deformation in Rehabilitated Pipelines
Publication: Pipelines 2023
ABSTRACT
Legacy pipelines experience damage associated with temperature fluctuations. Axial deformation and stress can be induced by pipe thermomechanical behavior. In legacy cast iron pipelines, movement induced by temperature fluctuations may be concentrated at weak joints or existing discontinuities. Successful installation of a rehabilitating internal pipe will affect thermal deformation of the host-repair system and must be designed to accommodate upper bound conditions. Here, an analytical approach is used to estimate potential levels of axial deformation. The assessment focuses on movement at a discontinuity, representative of a weak joint or circumferential crack in the host pipe, which is spanned by a rehabilitating internal pipe. Closed-form equations for induced force and crack opening displacement are derived. The analytical solution shows that crack opening displacement increases as initial crack width increases and the axial rigidity of the repair pipe decreases. The solutions at limiting cases compare favorably with previous work. These solutions provide a useful estimation of potential in-field displacements.
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Pipelines 2023
Pages: 260 - 269
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Published online: Aug 10, 2023
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