Abstract: Hybrid pipe for deep water, comprising a metallic rigid central part having an upper end of which is connected to an upper portion of flexible pipe of predetermined length and having a lower end of which is connected to a lower portion of flexible pipe of a length at least equal of the length of the upper portion of flexible pipe. The lower portion may have a wave-shaped form to absorb motion. The wave is formed by buoyant members on the lower flexible portion by an arch tethered to the sea bed on which the wave-shaped portion rests.

Abstract: The use of a buried or covered flexible seabed pipeline for transporting fluids is disclosed. The pipeline comprises a sealing barrier (3) and reinforcing layers (4, 5) capable of withstanding mechanical stress and arranged around said sealing barrier. The reinforcing layers consist of at least two crosswise-arranged reinforcing plies (4, 5) of wires helically wound at respective winding angles a.sub.i to the longitudinal axis of the pipeline, such that they comply with the following relationships: when i=1, 2, . . . , 52.degree..ltoreq.a.sub.i .ltoreq.58.degree.. The arithmetic mean a.sub.m of said winding angles a.sub.i complies with the following relationship: 53.degree..ltoreq.a.sub.m .ltoreq.57.degree..