The sealing performance of end fittings is very important for offshore oil and gas pipelines. To investigate the sealing behavior of a ring-shaped wedge seal, global and local numerical models of the ring–pipe interaction have been developed based on the finite-element method. First, the sealing process of the ring under pressure is simulated. Second, a criterion for the penetration of fluid pr...

As oil and natural gas production continue to go deeper into the ocean, flexible riser, as a connection surface of marine channel, will confront greater problems in its practical application. Composite materials are being considered replace steel unbonded pipe order successfully meet lightweight high-strength criteria ultra-deep-water production. The carbon-fiber-reinforced material substitutes...

Fiber-reinforced flexible pipes are subjected to large axial tension loads in deep-water applications, which may result the excessive deformation of pipes. Owing anisotropy composite materials, accurately describing tensile behavior these is difficult. Theoretical, numerical, and experimental methods employed this study investigate mechanical characteristics a glass fiber-reinforced unbonded pi...

Marine flexible pipe/cables, such as umbilicals, pipes and cryogenic hoses, are widely adopted in ocean engineering. The reinforcing armor layer these pipe/cables is the main component for bearing loads, which a typical multi-layer helically wound slender structure with different winding angles devices. There has been no general theoretical methodology to describe tensile performance of pipe/ca...

A brief review of recent literature on riser design is presented and a concise description of the design process is given. Effects of hydrodynamical design parameters on marine flexible riser design are then reviewed. Riser dynamic analyses are described which substantiate design criteria for the selection of riser configuration in deep and shallow water. The results of dynamic analyses using c...

Preliminary testing in the laboratory has been used to investigate the interaction between the soil and a damaged rigid pipe under earth disturbance. The test geometry and measurement scheme to evaluate movement at fractures are described. Conclusions are drawn regarding the impact of the four 90 segments of damaged pipe on the deformation of the system when disturbed. The flexural stiffness of...