Patent ID: 8499799

Claim:
A flexible pipe, which comprises a versatile and flexible tubular main portion, or body, which is made up of at least two coaxial tubular elements and which is sealably connected at each of its two ends to a rigid tubular connector tip, wherein: the two coaxial tubular elements making up said body consist, from the outside toward the inside, of: a) a pressure arch comprising several layers of filaments with a small thickness having a high tensile strength, wound in a helix and in opposition with a wrapping angle in relation to a generatrix of said tubular elements which is constant and substantially equal to 54.7°, these filaments being incorporated into a layer of elastomer; b) an attachable sealing layer in a plastic material or elastomer, the outer surface of which is in contact with the inner surface of the pressure arch ( 1 b - 1 c ), but without being integral therewith, such that a slight relative sliding between these two layers is possible upon inflation of the flexible pipe caused by a high internal pressure; the rigid tubular connector tip comprises two coaxial cylindrical sleeves integral with each other, namely: α) an inner sleeve, the internal diameter of which is equal to the external diameter of the sealing layer, such that the latter fits without play in the inner sleeve and is held there at its free end portion by a mechanical blocking member, the external diameter of this inner sleeve being slightly larger than the internal diameter of the pressure arch, the latter part surrounding the inner sleeve with a certain degree of gripping and being secured thereon, while also being separated from the sealing layer; β) an outer sleeve, or flange, the internal diameter of which is slightly larger than the external diameter of the pressure arch, this flange extending axially from the flexible pipe body over a length larger than that of the inner sleeve while surrounding, with some play, a transitional area, with variable diameter, from the pressure arch; the rigid tubular connector tip is provided with a pair of annular support elements-or rings-in a flexible and elastically deformable material and with a variable profile, arranged at said transitional area of the pressure arch, one inserted between the sealing layer ( 1 a ) and the pressure arch and the other inserted between the pressure arch and the flange.