Coaxial pipe assembly including a thermally insulating sleeve

摘要

An assembly of two coaxial pipes of the PiP type, having at least two coaxial pipe unit elements each with an inner pipe and an outer pipe, defining an annular space, filled with an insulating material, and assembled end to end by welding, including a sleeve with a hollow tubular wall made of rigid or semirigid material, preferably of plastics material or composite material, surrounding the pipe in register with the welded junction zone between the two coaxial pipe unit elements, the hollow tubular wall of the sleeve having an outer casing and an inner casing connected together at their longitudinal ends in leaktight manner, thereby defining an internal volume that is completely filled with a quasi-incompressible thermally insulating material.

主权项

1. An assembly of coaxial pipes of the PiP type, comprising at least two coaxial pipe unit elements each comprising an inner pipe and an outer pipe, with an annular space and assembled end to end by welding to form a welded junction zone, wherein the assembly includes a sleeve with a hollow tubular wall made of rigid or semirigid material surrounding said outer pipe of said assembly of coaxial pipes, in register with the welded junction zone between said two coaxial pipe unit elements, said hollow tubular wall of the sleeve comprising an outer casing and an inner casing connected together at their longitudinal ends in leaktight manner, thereby defining an internal volume that is completely filled with a quasi-incompressible thermally insulating material implementable in said internal volume in a liquid state and being gelled or cross-linked thereafter, said sleeve extending over only a portion of each of said two unit elements and including said welding.