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TECHNICAL PAPERS

Strength Analyses of Sandwich Pipes for Ultra Deepwaters

[+] Author and Article Information
Segen Farid Estefen, Theodoro Antoun Netto

Ocean Engineering Department, COPPE-Federal University of Rio de Janeiro, P.O. Box 68508, Rio de Janeiro, RJ, 21945-970, Brazil

Ilson Paranhos Pasqualino

Ocean Engineering Department, COPPE-Federal University of Rio de Janeiro, P.O. Box 68508, Rio de Janeiro, RJ, 21945-970, Brazililson@lts.coppe.ufrj.br

J. Appl. Mech 72(4), 599-608 (Oct 26, 2004) (10 pages) doi:10.1115/1.1940667 History: Received December 01, 2003; Revised October 26, 2004

Design requirements for pipelines regarding both ultimate strength and flow assurance in ultra deepwater scenarios motivated the development of a new sandwich pipe which is able to combine high structural and thermal insulation properties. In this concept, the annulus is filled with low cost materials with adequate thermal insulation properties and good mechanical resistance. The aim of this research work is to perform small-scale laboratorial tests and to develop a finite element model to evaluate the structural performance of such sandwich pipes with two different options of core material. After calibrated in view of the experimental results, a three-dimensional finite element model incorporating nonlinear geometric and material behavior is employed to perform strength analyses of sandwich pipes under combined external pressure and longitudinal bending. Ultimate strength envelopes for sandwich pipes are compared with those generated for single-wall steel pipes with equivalent collapse pressures. The study shows that sandwich pipe systems with either cement or polypropylene cores are feasible options for ultra deepwater applications.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Sandwich pipe geometry

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Figure 2

Experimental setup for cement injection

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Figure 3

Polypropylene specimen

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Figure 4

Engineering stress-strain curve of aluminum tubes

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Figure 5

Cement compressive stress-strain curve

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Figure 6

Polypropylene tensile stress-strain curve

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Figure 7

Pressure-strain response recorded during the test of specimen PIP.M2.G1.I02

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Figure 8

Collapsed cross section of specimen PIP.M2.G1.I02

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Figure 9

Typical finite element mesh used in the correlation analyses

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Figure 10

Three-dimensional finite element mesh

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Figure 11

Ring with unit length under longitudinal bending

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Figure 12

True stress versus logarithmic plastic strain of the API steel grade X-60

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Figure 13

Polypropylene nominal stress-strain curve (11)

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Figure 14

Pressure-curvature ultimate strength for sandwich pipes filled with polypropylene

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Figure 15

Pressure-curvature ultimate strength for sandwich pipes filled with cement

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Figure 16

Pressure-curvature ultimate strength for both sandwich (polypropylene) and single-wall pipes—case 1

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Figure 17

Pressure-curvature ultimate strength for both sandwich (polypropylene) and single-wall pipes—case 2

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Figure 18

Pressure-curvature ultimate strength for both sandwich (polypropylene) and single-wall pipes—case 3

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Figure 19

Pressure-curvature ultimate strength for both sandwich (cement) and single-wall pipes—case 1

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Figure 20

Pressure-curvature ultimate strength for both sandwich (cement) and single-wall pipes—case 2

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Figure 21

Pressure-curvature ultimate strength for both sandwich (cement) and single-wall pipes—case 3

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