pipe element, double wall pipe, spool, methods for producing a double wall pipe and placing a double wall pipe of a vessel on a seabed, and pipe element and pipe uses

摘要

pipe element, double wall pipe, spool, methods for producing a double wall pipe and for placing a double wall pipe of a vessel on a seabed, and pipe element and pipe uses. a pipe member (1) for constructing a double walled pipe, wherein the pipe member (1) comprises an outermost pipe member (3) and an innermost pipe member (4) located within the pipe member. outer tube (3), outer tube element (3) has a substantially annular cross-sectional shape and comprises an inner surface (16), inner tube element (4) has a substantially annular cross-sectional shape and comprises an outer surface (15), the diameter of the inner surface is larger than the diameter of the outer surface, the outer tube element (3) is made of a metallic material and the inner tube element (4) is made of a non-metallic material.