Prediction of Burst in Flexible Pipes

Autor(es)

Gay Neto, Alfredo ^[1] ; Martins, Clovis de Arruda ^[1] ; Pesce, Celso Pupo ^[1] ; Meirelles, Christiano Odir C. ^[1] ; Malta, Eduardo Ribeiro ^[1] ; Barbosa Neto, Teofilo Ferreira ^[2] ; Ferreira Godinho, Carlos Alberto ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Mech Engn, Sao Paulo - Brazil

^[2] Prysmian Cables & Syst, Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME; v. 135, n. 1 FEB 2013.
• Citações Web of Science: 8

Resumo

Usually when a large internal fluid pressure acts on the inner walls of flexible pipes, the carcass layer is not loaded, as the first internal pressure resistance is given by the internal polymeric layer that transmits almost all the loading to the metallic pressure armor layer. The last one must be designed to ensure that the flexible pipe will not fail when loaded by a defined value of internal pressure. This paper presents three different numerical models and an analytical nonlinear model for determining the maximum internal pressure loading withstood by a flexible pipe without burst. The first of the numerical models is a ring approximation for the helically rolled pressure layer, considering its actual cross section profile. The second one is a full model for the same structure, considering the pressure layer laying angle and the cross section as built. The last numerical model is a two-dimensional (2D) simplified version, considering the pressure layer as an equivalent ring. The first two numerical models consider contact nonlinearities and a nonlinear elastic-plastic material model for the pressure layer. The analytical model considers the pressure armor layer as an equivalent ring, taking into account geometrical and material nonlinear behaviors. Assumptions and results for each model are compared and discussed. The failure event and the corresponding stress state are commented. (AU)

• Processo FAPESP: 06/06277-0 - Análise dinâmica linear e não-linear de cabos submersos
• Beneficiário: Alfredo Gay Neto
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto