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Cover of Design of Buried Flexible Pipes
Design of Buried Flexible Pipes
  • Publication no: AP-R575-18
  • ISBN: 978-1-925671-60-5
  • Published: 10 August 2018

The standard, AS/NZS 2566.1 (1998): “Buried Flexible Pipes: Structural Design”, provided a significant step forward when it was first introduced in that it covered competing flexible pipe products and materials, and included them all in a single document.

The standard was recently amended for the purpose of increasing its scope to include polypropylene. The amendment so produced was not a comprehensive review, and has limitations in that it failed to cater in the design for the following:

  • Update provisions for traffic load to make them consistent with AS 5100.2 (2017).
  • Provision of sufficient safety margins for some of the materials.
  • Direct membrane hoop strains (important for profile wall pipes).
  • The effects of local instability (important for profile wall pipes).

The objective of this report is to address these issues and also to illustrate their consideration by way of examples. The report includes design equations and typical design outcomes for the various flexible products and materials to which the standard refers.

The report also includes a design outcome for a corresponding rigid pipe under the same conditions for the purpose of comparison.

  • Summary
  • 1. Introduction
  • 2. Design Methodology
  • 3. Design Loading
  • 4. Soil Stiffness
  • 5. Pipe Properties
    • 5.1 Pipe Section Properties
    • 5.2 Pipe Stiffness and Strain
  • 6. Design Criteria
  • 7. Alternative Design Solutions
  • 8. Summary and Conclusions
  • 9. Recommendations for Further Work
  • References
  • Appendix A Live Loading
  • Appendix B Plastic Profile Wall Pipes
    • B.1 Determination by Calculation
    • B.2 Curved Elements
    • B.3 Determination by Testing
  • Appendix C Steel Reinforced Plastic Pipes
    • C.1 Compatibility of Plastic and Steel
    • C.2 Recent Development and Application
  • Appendix D Plastic Pipe Stiffness and Strain
  • Appendix E Flexible Pipe Costs
  • Appendix F Flexible vs Rigid Pipe