An investigation on flexible pipes birdcaging triggering

Autor(es)

Rabelo, Marcos A. ^[1] ; Pesce, Celso P. ^[1] ; Santos, Caio C. P. ^[1] ; Junior, Roberto Ramos ^[1] ; Franzini, Guilherme R. ^[1] ; Neto, Alfredo Gay ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Escola Politecn, Offshore Mech Lab, LMO, BR-05508030 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MARINE STRUCTURES; v. 40, p. 159-182, JAN 2015.
• Citações Web of Science: 7

Resumo

An investigation on triggering mechanism g for the birdcaging failure mode of flexible pipes, used in offshore oil and gas production, is carried out. From previous experimental observations, a conjecture is made: the local axisymmetric instability of the external plastic layer, caused by the high radial loading which is internally applied due to the helical armor wires tendency to expand when the pipe is subjected to compression, would be this trigger. A simple instability onset criterion for the external plastic layer, namely, the polymer intrinsic yielding limit stress, is proposed and assessed, analytically, numerically and experimentally for HDPE tubes. Then, previous birdcaging experimental observations are investigated further, focusing on the flexible pipe external plastic layer, to assess the proposed criterion. Strong evidences of validity are obtained. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 12/10274-8 - Investigação experimental da instabilidade de tubos de polietileno de alta densidade (PEAD) sob compressão axial e pressurização interna
• Beneficiário: Celso Pupo Pesce
• Modalidade de apoio: Auxílio à Pesquisa - Regular