System having a device for producing a pipeline unit and method for producing a pipeline unit

1 . A system having a device for producing a pipeline unit from a pipeline having a pipeline outer surface and a pipe connector having a pipe connector outer surface, wherein the device comprises an annularly structured stress-relieving device having a longitudinal central axis and a radially inwardly pointing stress-relieving device inner surface, wherein the stress-relieving device inner surface is adapted to the pipeline outer surface and/or the pipe connector outer surface in order to at least partially receive the pipeline unit to be produced in an operating state, and the stress-relieving device surrounds a pressure tool in the operating state so as to support the pipeline unit to be produced in the operating state when the pipeline is expanded by the pressure tool,

wherein the stress-relieving device has a stress-relieving device annular body, which has two annular body elements that together form the stress-relieving device inner surface, which elements respectively have a first end section and a second end section, wherein the first end sections are arranged pivotally moveable with respect to one another about a pivot axis,

wherein a connection element is arranged on each second end section and the connection elements are configured to interact with one another in order to releasably connect the second end sections,

wherein the stress-relieving device inner surface has at least one annular groove for at least partially receiving the pipe connector,

wherein the stress-relieving device forms an annular projection projecting radially inwards, which is delimited on one side by a first axial stress-relieving device end face and on the other side by a lateral groove boundary surface of the at least one annular groove facing away from the first axial stress-relieving device end face,

wherein the stress-relieving device has a second axial stress-relieving device end face opposite the first axial stress-relieving device end face, which is stepped, which forms an annular stress-relieving device collar radially supporting the pipeline inserted into the pipe connector,

wherein the annular projection projecting radially inwards projects radially inwards to such an extent that the annular projection forms a stop for abutting a longitudinal outermost end face of the pipeline inserted into the pipe connector.

2 . The system according to claim 1 , wherein the system further comprises the pipeline unit having the pipeline and the pipe connector.

3 . The system according to claim 1 , wherein the stress-relieving device inner surface is stepped.

4 . The system according to claim 1 , wherein each of the connection elements arranged on the respective second end sections comprises a connection hole having a bearing hole central axis.

5 . The system according to claim 4 , wherein the connection hole on each of the respective second end sections are configured to be aligned with one another to create aligned connection holes, and the connection elements are connected to one another by a locking element arranged in the aligned connection holes.

6 . The system according to claim 1 , wherein the stop is adapted to maintain a pipeline end face and a flange section end face of a flange section of the pipe connector flush with one another during expansion by the pressure tool.