On the response of flexible risers to loads imposed by hydraulic collars |
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| Authors: | José RM de Sousa Carlos Magluta Ney Roitman Gilberto B Ellwanger Edison CP Lima Arnaldo Papaleo |
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| Institution: | 1. COPPE/UFRJ, Department of Civil Engineering, Centro de Tecnologia, Bloco I2000, Sala I116, Cidade Universitária, Ilha do Fundão Rio de Janeiro, CEP 21945-970, Brazil;2. PETROBRAS Research and Development Center, Cidade Universitária, Quadra 7, Ilha do Fundão Rio de Janeiro, CEP 21949-900, Brazil;1. Ocean Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;2. Petrobras, CENPES, Rio de Janeiro, Brazil;1. Ocean Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;2. Petrobras, CENPES, Rio de Janeiro, Brazil;1. Ocean Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil;2. Petrobras, CENPES, Rio de Janeiro, Brazil;1. Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, South Korea;2. RIMSE, Department of Naval Architecture and Ocean Engineering, Seoul National University, Seoul, South Korea;3. Offshore System R&D Department, Daewoo Shipbuilding & Marine Engineering Co., Ltd., Seoul, South Korea |
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| Abstract: | Even though hydraulic collars are largely used to install flexible risers, neither the loads imposed by this equipment nor the response of the risers to these loads have been previously studied. Hence, this paper presents a three-dimensional nonlinear finite element (FE) model to predict the response of flexible risers to loads imposed by hydraulic collars and also provides a set of equations to predict these loads. The FE model relies on an analogy between helical tendons and orthotropic shells to simulate the inner carcass and the pressure armour of flexible risers. Shell elements are used to represent the polymeric layers and three-dimensional beam elements simulate the wires of the tensile armours. Material, geometric and contact nonlinearities are addressed. Contact interactions between the layers of the riser are handled by surface to surface contact elements with a contact detection algorithm based on the pinball technique and contact forces evaluated with the augmented Lagrangian method. A 9.5″ flexible riser is analyzed and the numerical results are compared to those from the experimental tests. The agreement between all results indicates that the proposed FE model is an efficient approach to predict the response of flexible risers to loads imposed by hydraulic collars and, moreover, may be used to analyze the response of such structures to other types of loads. |
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