Bursting failure modes of double carcass floating hose

Double carcass floating hoses (DCFHs) are extensively utilized in offshore oil and gas transportation, with the outer carcass serving as an effective means to minimize or entirely prevent leakage of conveyed fluid. This study employs a combined approach involving numerical simulation and full-scale burst experiments to investigate the mechanical-structural behavior and failure mechanisms of DCFHs with inner diameter of 600 mm subjected to internal pressure and tension. By using rebar elements and embedded element method, a nonlinear largedeformation finite element model for DCFHs under internal pressure and tensile loads was established. The accuracy and effectiveness of the finite element analysis is validated against full-scale experimental results. Python programming language is employed to create the script used in the parametric modeling of DCFHs with ABAQUS software. The impact of varying parameters such as inner diameter, helix steel wire pitch, number of cord layers beneath the helix steel wire, and winding angles were analyzed for DCFHs under burst pressure. Based on the classical thick-walled cylinder ultimate internal pressure theory, a fitting formula for predicting the burst pressure of DCFHs is proposed. This paper provides valuable insights in the structural design and application of DCFHs under ultimate internal pressure loads.