0
Journal of Offshore Mechanics and Arctic Engineering | Volume 129 | Issue 3 | TECHNICAL PAPERS
TECHNICAL PAPERS

Analysis and Design of Buried Pipelines for Ice Gouging Hazard: A Probabilistic Approach

[+] Author and Article Information
Arash Nobahar

 Fugro-McClelland Marine Geosciences, Inc., Houston, TX 77081

Shawn Kenny, Tony King, Ryan Phillips

 C-CORE, St. John’s, NL, A1B 3X5, Canada

Richard McKenna

 Consultant, Ice, Environment and Risk, Wakefield, QC, J0X 3G0, Canada

J. Offshore Mech. Arct. Eng 129(3), 219-228 (Aug 03, 2006) (10 pages) doi:10.1115/1.2426989 History: Received August 01, 2005; Revised August 03, 2006
Article
References
Figures
Tables
Citing Articles

In cold environments, marine pipelines may be at risk from ice keels that gouge the seabed. Large quantities of material are displaced and soil deformations beneath a gouge may be substantial. To meet safety criteria, excessive strains are avoided by burying pipelines to a sufficient depth. In this paper, a probabilistic approach for the analysis and design of buried pipelines is outlined. Environmental actions are applied through distributions of gouge width, gouge depth, subgouge soil deformations, and bearing pressure. Three-dimensional pipe/soil interaction problem is modeled using nonlinear soil springs and special beam elements using the finite element method to estimate pipe response for statistically possible ranges of gouge depths, gouge widths, and burial depths. Relevant failure mechanisms have been considered, including local buckling and a variety of strain and stress based criteria. The methodology presented in the paper was developed and successfully used for several pipeline and electrical cable projects in ice gouge environments. Significantly reduced burial depth requirements have been demonstrated through the application of the probabilistic approach and through the use of strain-based design criteria. Because ice actions are applied through displacements of the soil, more ductile pipes are often necessary to meet reliability targets.
FIGURES IN THIS ARTICLE
<>
Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
+Soil-pipeline interaction (a) continuum analysis, (b) idealized structural model, and (c) soil load-displacement response (tu,xu, pu,yu, quu, zuu, qud, zud are spring characteristics)
View Large  |  Save Figure  |  Download Slide (.ppt)
Soil-pipeline interaction (a) continuum analysis, (b) idealized structural model, and (c) soil load-displacement response (tu,xu, pu,yu, quu, zuu, qud, zud are spring characteristics)
Figure 2

Soil-pipeline interaction (a) continuum analysis, (b) idealized structural model, and (c) soil load-displacement response (tu,xu, pu,yu, quu, zuu, qud, zud are spring characteristics)

Grahic Jump Location
+Schematic representation of (a) compressive strain Load Resistance Factored Design (LRFD) and (b) compressive strain reliability based approaches
View Large  |  Save Figure  |  Download Slide (.ppt)
Schematic representation of (a) compressive strain Load Resistance Factored Design (LRFD) and (b) compressive strain reliability based approaches
Figure 3

Schematic representation of (a) compressive strain Load Resistance Factored Design (LRFD) and (b) compressive strain reliability based approaches

Grahic Jump Location
+Schematic pipeline burial depth definition
View Large  |  Save Figure  |  Download Slide (.ppt)
Schematic pipeline burial depth definition
Figure 4

Schematic pipeline burial depth definition

Grahic Jump Location
+Clearance depth contours (m) to satisfy factored compressive strain limit for 762mm(30in) diameter pipeline with 15.9mm(0.625in.) wall thickness
View Large  |  Save Figure  |  Download Slide (.ppt)
Clearance depth contours (m) to satisfy factored compressive strain limit for 762mm(30in) diameter pipeline with 15.9mm(0.625in.) wall thickness
Figure 5

Clearance depth contours (m) to satisfy factored compressive strain limit for 762mm(30in) diameter pipeline with 15.9mm(0.625in.) wall thickness

Grahic Jump Location
+Probability of exceedance curves/target probability level to determine cover depth requirements
View Large  |  Save Figure  |  Download Slide (.ppt)
Probability of exceedance curves/target probability level to determine cover depth requirements
Figure 8

Probability of exceedance curves/target probability level to determine cover depth requirements

Grahic Jump Location
+Illustrative example of pipeline route burial depth requirements (after Ref. 8)
View Large  |  Save Figure  |  Download Slide (.ppt)
Illustrative example of pipeline route burial depth requirements (after Ref. 8)
Figure 7

Illustrative example of pipeline route burial depth requirements (after Ref. 8)

Grahic Jump Location
+Probability of exceedance curves for 762mm(30in.) diameter pipeline with 15.9, 22.2, and 32mm(a), (b), and (c) wall thickness
View Large  |  Save Figure  |  Download Slide (.ppt)
Probability of exceedance curves for 762mm(30in.) diameter pipeline with 15.9, 22.2, and 32mm(a), (b), and (c) wall thickness
Figure 6

Probability of exceedance curves for 762mm(30in.) diameter pipeline with 15.9, 22.2, and 32mm(a), (b), and (c) wall thickness

Grahic Jump Location
+Schematic representation of ice feature gouging seabed
View Large  |  Save Figure  |  Download Slide (.ppt)
Schematic representation of ice feature gouging seabed
Figure 1

Schematic representation of ice feature gouging seabed

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Structural Performance of Thermo-Active Foundations
Thermoactive Foundations for Sustainable Buildings
Introduction and Definitions
Handbook on Stiffness & Damping in Mechanical Design> Chapter 1
Insights and Results of the Shutdown PSA for a German SWR 69 Type Reactor (PSAM-0028)
Proceedings of the Eighth International Conference on Probabilistic Safety Assessment & Management (PSAM)
Numerical Simulation of Spatial Synergic Interaction in the Double-Row Anti-Sliding Piles
Geological Engineering: Proceedings of the 1st International Conference (ICGE 2007)
Basic Concepts
Design & Analysis of ASME Boiler and Pressure Vessel Components in the Creep Range> Chapter 1
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In