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Pipeline Systems

Assessment of the Environmental Effects on the Performance of FRP Repaired Steel Pipes Subjected to Internal Pressure

[+] Author and Article Information
Ramadan A. Esmaeel1

Department of Civil and Resource Engineering,  Dalhousie University, 1360 Barrington Street,Halifax, NS, B3J 1Z1, Canada

Mohamed A. Khan

Department of Civil and Resource Engineering,  Dalhousie University, 1360 Barrington Street,Halifax, NS, B3J 1Z1, Canada

Farid Taheri2

Department of Civil and Resource Engineering,  Dalhousie University, 1360 Barrington Street,Halifax, NS, B3J 1Z1, Canadafarid.taheri@dal.ca

1

Visiting Assistant Professor, Fayoum University, Fayoum, Egypt.

2

Corresponding author.

J. Pressure Vessel Technol 134(4), 041702 (Jul 27, 2012) (7 pages) doi:10.1115/1.4005944 History: Received July 26, 2011; Revised December 10, 2011; Published July 26, 2012; Online July 27, 2012

The use of composite materials for repair and rehabilitation of corroded steel pipes has been increasingly growing in the oil and gas industry. However, there exists a noticeable gap in the literature on the long term performance of composite repaired pipes, especially those subjected to large internal pressure magnitudes. This work is an attempt toward filing the gap by gaining a better understanding of the effects of environmental conditions on the long term performance of composite repaired pipes subjected to large internal pressures. Finite element method (FEM) is used to simulate typical composite warp-repaired gouged steel pipes, conditioned in various environments and subsequently subjected to internal pressure. The influence of the resulting degradation in composite’s mechanical properties on the performance of the system was evaluated. To validate the results, an experimental program was designed and carried out. Repaired specimens were conditioned in an environmental chamber under certain thermal and moisture conditions; then, the specimens were tested to failure subject to internal pressure. Good correlation was obtained after fine tuning of FEM model’s material data through the use of the experimentally obtained data.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Pipe specimen’s dimensions and gouge geometry before applying the composite repair

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Figure 2

(a) Steel pipe’s defect filled with filler, (b) FRP repaired pipe, using the hand layup process, and (c) experimental setup showing a specimen in the Amsler loading machine

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Figure 3

(a) FE model of the repaired pipe and (b) details of the defect region mesh in the steel pipe

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Figure 4

Variation of the hoop strain in the FRP as a function of the internal pressure for the virgin pipes

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Figure 5

Variation of the hoop strain in the FRP as a function of the recorded strain for the virgin pipes

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Figure 6

Variation of the hoop strain in the FRP as a function of the recorded strain for the pipes subjected to hot cycles only

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Figure 7

Variation of the hoop strain in the FRP as a function of the recorded strain for the pipes subjected to hot cycles only

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Figure 8

Variation of the hoop strain in the FRP as a function of the recorded strain for the pipes subjected to hot cycles and moisture

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Figure 9

Variation of the hoop strain in the FRP as a function of the recorded strain for the pipes subjected to hot cycles and moisture

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