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RESEARCH PAPERS: Offshore Mechanics

Calculation of Stresses and Slip in Structural Layers of Unbonded Flexible Pipes

[+] Author and Article Information
J. J. Féret, C. L. Bournazel

Institut Français du Pétrole, Rueil-Malmaison, France

J. Offshore Mech. Arct. Eng 109(3), 263-269 (Aug 01, 1987) (7 pages) doi:10.1115/1.3257019 History: Received October 24, 1986; Online October 30, 2009

Abstract

This paper deals with the behavior of high-pressure unbonded flexible steel pipes which can be used as risers in offshore applications. It concerns primarily the behavior of the internal structure of the pipe. A theoretical approach allows to establish simple formulas for evaluating: the stresses, and the contact pressures between layers due to axisymmetrical loads; the stresses due to bending; the relative slip between layers due to bending. This is a first step towards the evaluation of the life expectancy of flexible pipes. It must be completed by the determination of friction and wear factors through test results.

Copyright © 1987 by ASME
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