An investigation on flexible pipes birdcaging triggering |
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| Institution: | 1. M.Tech student,Dept of Ocean Engineering, IITM, Chennai, 600036, India;2. Associate Professor, Dept of Ocean Engineering, IITM, Chennai, 600036, India;1. Instituto Mexicano del Petróleo, Eje Central Lázaro Cardenas 152, Col. San Bartolo Atepehuacan, 07730 México City, Mexico;2. COPPE – Federal University of Rio de Janeiro, Ocean Engineering Department, Cidade Universitária, CT Bloco I-2000, Ilha do Fundão 21945-970, Rio de Janeiro, Brazil;1. College of Shipbuilding Engineering, Harbin Engineering University, Chuanhai Building 904, 145 Nantong Street, Harbin, China;2. Department of Marine Technology, Norwegian University of Science and Technology, O. Nielsens vei 10, 7491 Trondheim, Norway;1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, China;1. Ocean Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;2. Petrobras, CENPES, Rio de Janeiro, Brazil |
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| Abstract: | An investigation on triggering mechanisms 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. |
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| Keywords: | Flexible pipes Birdcaging triggering HDPE tubes Simple plastic limit criterion Intrinsic yielding limit |
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