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Application of Composite Wraps for Strengthening of Buried Steel Pipelines Crossing Active Faults

[+] Author and Article Information
Oleg V. Trifonov

Research Institute for Natural Gases and Gas
Technologies (GAZPROM VNIIGAZ),
Razvilka poselok,
Leninsky District,
Moscow 142717, Russia
e-mail: O_Trifonov@vniigaz.gazprom.ru

Vladimir P. Cherniy

Research Institute for Natural Gases and Gas
Technologies (GAZPROM VNIIGAZ),
Razvilka poselok,
Leninsky District,
Moscow 142717, Russia

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 10, 2015; final manuscript received March 2, 2016; published online July 18, 2016. Editor: Young W. Kwon.

J. Pressure Vessel Technol 138(6), 060902 (Jul 18, 2016) (8 pages) Paper No: PVT-15-1118; doi: 10.1115/1.4032915 History: Received June 10, 2015; Revised March 02, 2016

In the paper, the efficiency of strengthening of a buried steel pipeline with a composite wrap subjected to an active faults action is analyzed. A three-dimensional numerical model of the pipeline is developed. The pipeline is considered as an elastoplastic steel shell, while the composite wrap is represented as an orthotropic elastic shell. The model takes into account the elastoplastic behavior of soil, contact interaction between the soil and the pipe, large inelastic strains, distortion of the pipeline cross section, and local buckling formation. A normal-slip fault kinematics with large fault offsets is considered in numerical modeling. The effect of the wrap thickness, length, and position relative to the fault plane is analyzed.

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Figures

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Fig. 1

Structural model of a reinforced pipe crossing a normal-slip fault

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Fig. 2

Schematization of the composite wrap material

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Fig. 3

Deviatoric section of the Mohr–Coulomb and the Drucker–Prager yield surfaces

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Fig. 4

Fragment of the finite-element model in the deformed state

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Fig. 5

(a) Longitudinal strain variation along the pipe under the fault offset Δf=3.0 m. (b) Scaled-up view of the near-fault zone.

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Fig. 6

Hoop stress distribution along the bottom generator in the pipe wall (p) and in the wrap (w) for the fault offset Δf= 0.3, 1.3, and 3 m

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Fig. 7

Equivalent strain distributions along the unreinforced pipeline (a) and reinforced pipeline (b) under the fault offset Δf= 3 m

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Fig. 8

Evolution of longitudinal compressive strains in the critical cross section

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Fig. 9

Critical fault offset as a function of the wrap thickness

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Fig. 10

Critical fault offset as a function of the wrap length

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Fig. 11

Comparison of longitudinal strain distributions along the top pipe generator for the cases Lw2=13.5 m (curve 1) and Lw2=7.5 m (curve 2)

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