Hydrogen pipe coupling arrangement with enhanced inner sealing

A hydrogen pipe coupling arrangement comprising:

• a first multiple-wall hydrogen pipe section with a first coupling portion,
• a second multiple-wall hydrogen pipe section with a second coupling portion configured to be connected to the first coupling portion,
• a sealing arrangement for sealing a connection between the first and second coupling portions,
• a pressing device for pressing the first coupling portion and the second coupling portion together,
• the first multiple-wall hydrogen pipe section having a first inner pipe and a first outer pipe wherein the first coupling portion comprises an annular first inner joint section on the first inner pipe and an annular first outer joint section on the first outer pipe,
• the second multiple-wall hydrogen pipe section having a second inner pipe to be connected in fluid-communication to the first inner pipe and a second outer pipe to be connected to the first outer pipe,
• the second coupling portion having an annular second inner joint section on the second inner pipe configured to be connected with the first inner joint section to form an inner pipe joint and an annular second outer joint section on the second outer pipe configured to be connected with the first outer joint section in order to form an outer pipe joint,
• the sealing arrangement having an inner seal configured to seal the inner pipe joint and an outer seal configured to seal the outer pipe joint,
• the hydrogen pipe coupling arrangement further comprising a spring element configured to apply a pre-pressing force onto the inner seal by biasing at least one of the first inner joint section or the second inner joint towards the other of the first inner joint section or the second inner joint section in addition to a pressing force of the pressing device,
• wherein the first outer joint section is a first outer flange on the first outer pipe with an annular first outer sealing seat portion for achieving the outer seal and that the second outer joint section is a second outer flange on the second outer pipe with an annular second outer sealing seat portion for achieving the outer seal,
• wherein the pressing device comprises an outer flange pressing device for pressing the first and second outer flanges together.