Pipe has a double envelope for the transport of fluids, provided with a device for limiting the propagation of a deformation of the outer tube, and method of limiting the propagation

摘要

The double pipe (1), comprising coaxial inner (2) and outer (3) pipes separated by an annular gap (5) and a thermal insulation layer (4), can be rolled up and has the deformation of the outer or carrier pipe limited by radial projections (10) on the inner pipe or flow line permitting a localized reduction in the gap. Each projection has a length of between 0.3 and 5 times, and preferably 0.3 - 3 times, the diameter of the outer pipe, and a thickness of 0.1 - 0.9 times, and preferably 0.1 - 0.8 times that of the annular gap. It can be formed by a section of the inner pipe of increased thickness, or by a spring, rings or a sleeve between spacers.