Insulating element for conveying conduit hot gases and method of making such a conduit

Element carrying conduit gases at high temperature comprising a thermal insulation element of revolution comprising a non-hermetic wrapping longitudinal axis (X) disposed in said housing at least one thermal insulating fibrous, being encapsulated said thermal insulating in the casing, the casing in an outer casing (104) from the conveying fluid and jacket (102) intended to be in contact with the fluid to be transported being formed and comprising a first longitudinal end (106) a male connector (108) and a second longitudinal end (110) opposite the first longitudinal end (116), a female connector (112), the outer casing (104) and the jacket (102) being connected by the plugs (108) and female (112), said envelope comprising an axially adaptable annular zone, said adaptable zone being situated in the female connector (112), comprising said female connector first part (112.2) fixed on the jacket (102) and a second part (112.8) fixed on the outer casing (104), penetrating said second part in the first part, the first comprising and second part a first ( 112.6) and a second (112.12) cylindrical surface respectively overlying said first (112.6) and second (112.12) surfaces and being suitable for sliding relative to each other in the case of expansions of said pipe insulation, ensuring always confining the thermal insulation, so as to form said adaptable zone.