Abstract: A coupling for a hydrogen pipe for coupling multi-wall pipe sections which is equipped with an inner seal and an outer seal and a pressing device that presses the pipe sections together. The hydrogen pipe coupling arrangement comprises at least one spring element configured to apply a pre-pressing force onto the inner seal in addition to a pressing force of the pressing device.

Abstract: A coupling for a double-walled pipe having an inner wall and an outer wall, the inner wall having an inner lumen, and the inner wall and the outer wall delimiting an outer lumen. The coupling comprises an inner section forming a passage in fluid communication with the inner lumen, and an outer section arranged radially adjacent to the inner section. A material of the outer section is interrupted in a radial direction multiple times in an area corresponding to a radial range between the inner wall and the outer wall. A further exemplary coupling may have an outer section that is interrupted multiple times in the longitudinal direction.

Abstract: A coupling for a hydrogen pipe for coupling multi-wall pipe sections which is equipped with an inner seal and an outer seal and a pressing device that presses the pipe sections together. The hydrogen pipe coupling arrangement comprises at least one spring element configured to apply a pre-pressing force onto the inner seal in addition to a pressing force of the pressing device.

Abstract: A pipe element suitable for use in a fuel system of an aircraft comprises an inner pipe and an outer pipe sealingly surrounding the inner pipe and connected to the inner pipe. The pipe element is constructed in one piece and is produced by a 3D printing process.