Expansion bellows for installation e.g. oil and gas installations, has inner and outer radial walls provided with respect to main axis of bellows, and thermal insulation layers placed and sandwiched between walls

摘要

The bellows have a hollow body with two axial open ends connected to pipes by welding. Undulations are provided for compensation of relative movement of the pipes of an installation e.g. oil installation. Inner and outer radial walls (14, 16) are provided with respect to a main axis of the bellows. The walls are made of a metallic material and are fixed to each other by welding. The welded walls are fixed on the pipes. Thermal insulation layers (18-1-18-4) are placed and sandwiched between the walls. An independent claim is also included for an installation comprising tubular elements and an expansion bellows.