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research-article

SIMPLIFIED FINITE ELEMENT MODELS TO STUDY THE WET COLLAPSE OF STRAIGHT AND CURVED FLEXIBLE PIPES

[+] Author and Article Information
Alfredo Gay Neto

Dept. of Structural and Geotechnical Engineering, University of São Paulo, São Paulo, SP, Brazil
alfredo.neto@gmail.com

Clovis de Arruda Martins

Dept. of Mechanical Engineering, University of São Paulo, São Paulo, SP, Brazil
cmartins@usp.br

Eduardo Malta

Dept. of Naval Arch. and Ocean Engineering, University of São Paulo, São Paulo, SP, Brazil
edurmalta@gmail.com

Rafael L. Tanaka

Prysmian Cables and Systems, Santo André, SP, Brazil
rafael.tanaka@gmail.com

Carlos Godinho

Prysmian Cables and Systems, Santo André, SP, Brazil
carlos.godinho.ex@prysmiangroup.com

1Corresponding author.

ASME doi:10.1115/1.4037291 History: Received December 08, 2015; Revised June 09, 2017

Abstract

When the external sheath of flexible pipes experiences damage, seawater floods the annulus. Then, the external pressure is applied directly on the internal polymeric layer and the load is transferred to the interlocked carcass, the innermost layer. In this situation the so-called wet collapse failure of the interlocked carcass can occur. Simplified methodologies to address such a scenario, using restrict three-dimensional finite element models, are presented in this work. They are compared to full three-dimensional models, studying both straight and curved flexible pipes scenarios. The curvature of the flexible pipe is shown to be important for wet collapse pressure predictions.

Copyright (c) 2017 by ASME
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