Insulated pipe and method for preparing same

摘要

The invention provides an insulated pipe-in-pipe assembly comprising (a) at least one inner pipe, (b) an outer pipe with an interior surface that is disposed around the at least one inner pipe, (c) an annular space between the interior surface of the outer pipe and the exterior surface of the at least one inner pipe, and (d) at least one container containing compressed porous, resilient, compressible material said container being disposed in the annular space, wherein said container is partially or completely enclosed within a sleeve.