Patent ID: 8893739

Claim:
Maintenance device for an elongated, tubular hollow body ( 2 ) which is configured for conducting a fluid, with a sealing device ( 4 ) which provides a sealing action for sealing a working region ( 9 ) from an environment ( 30 ) of the hollow body ( 2 ) and can be moved along the hollow body ( 2 ), wherein a side of the sealing device ( 4 ) that is to be turned toward the hollow body ( 2 ) forms an at least partly curved surface and can be moved along the hollow body ( 2 ), wherein the sealing device ( 4 ) comprises an adapter ( 3 ), wherein the adapter ( 3 ) is adapted to be attached to the hollow body ( 2 ) in a sealing manner, wherein the adapter ( 3 ) has a surface ( 7 ) facing away from the hollow body ( 2 ), wherein the adapter ( 3 ) forms the working region ( 9 ) allowing access to the hollow body ( 2 ), and wherein moveable parts of the sealing device ( 4 ) rest on the surface ( 7 ) of the adapter ( 3 ), wherein the moveable parts are adapted to move relative to the hollow body ( 2 ) in a first direction (A) and a second direction (B) extending transversely to the first direction (A) and are adapted to move across the working region ( 9 ) while maintaining said sealing action.