When submitted to high external pressure, flexible pipes may collapse. If the external sheath is damaged, all the external pressure is directly applied on the internal polymeric layer that transmits the loading to the carcass layer, which can fail due to this effect, leading to wet collapse. This failure mode must be taken into account in a flexible pipe design. A model can be set up neglecting the influence of the pressure armor, but this assumption may underestimate the wet collapse pressure value. This work aims to include the pressure armor effect in the numerical prediction of wet collapse. The main contribution of the pressure armor to the flexible pipe resistance to collapse is to be a constraint to the radial displacement of the carcass and the internal polymeric layers. Two models were developed to find the wet collapse pressure in flexible pipes. A first study was done using a ring approximation three-dimensional (3D) finite element method (FEM) model. Comparisons are made with more simplified models using a 3D FEM equivalent ring approximation. The aim is to clarify the mechanical behavior of the pressure armor in the wet collapse scenario. Parametric studies of initial ovalization of carcass and initial gaps and interference between polymeric layer and pressure armor are made and discussed.
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August 2014
Research-Article
Flexible Pipes: Influence of the Pressure Armor in the Wet Collapse Resistance
Alfredo Gay Neto,
Alfredo Gay Neto
1
Department of Structural
and Geotechnical Engineering,
e-mail: alfredo.gay@usp.br
and Geotechnical Engineering,
University of São Paulo
,São Paulo, SP
, Brazil
e-mail: alfredo.gay@usp.br
1Corresponding author.
Search for other works by this author on:
Clóvis de Arruda Martins
Clóvis de Arruda Martins
Department of Mechanical Engineering,
e-mail: cmartins@usp.br
University of São Paulo
,São Paulo, SP
, Brazil
e-mail: cmartins@usp.br
Search for other works by this author on:
Alfredo Gay Neto
Department of Structural
and Geotechnical Engineering,
e-mail: alfredo.gay@usp.br
and Geotechnical Engineering,
University of São Paulo
,São Paulo, SP
, Brazil
e-mail: alfredo.gay@usp.br
Clóvis de Arruda Martins
Department of Mechanical Engineering,
e-mail: cmartins@usp.br
University of São Paulo
,São Paulo, SP
, Brazil
e-mail: cmartins@usp.br
1Corresponding author.
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 29, 2011; final manuscript received April 17, 2014; published online May 19, 2014. Assoc. Editor: John Halkyard.
J. Offshore Mech. Arct. Eng. Aug 2014, 136(3): 031401 (8 pages)
Published Online: May 19, 2014
Article history
Received:
September 29, 2011
Revision Received:
April 17, 2014
Citation
Gay Neto, A., and de Arruda Martins, C. (May 19, 2014). "Flexible Pipes: Influence of the Pressure Armor in the Wet Collapse Resistance." ASME. J. Offshore Mech. Arct. Eng. August 2014; 136(3): 031401. https://doi.org/10.1115/1.4027476
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