Auxiliary device for repairing a pipeline

A pipeline repair device for enabling repair of a damaged location in a pipeline wall of a substantially cylindrical pipeline having an interior surface with an inner radius, while allowing a fluid to flow through the pipeline, said pipeline repair device comprising:

• a base element that includes at least one bypass pipe through which the fluid in the pipeline may flow axially and whose outer dimension is smaller than the inner radius of the pipeline wall;
• said bypass pipe including means for regulating the flow resistance of the pipeline repair device within the pipeline, such that the pipeline repair device may be transported by the fluid flowing through the pipeline, allowing routing control, and controlled to stop the pipeline repair device at a particular location within the pipeline;
• said base element including a sealing module having at least two separated but parallel radially-expandable, sealing collars mounted on and connected to each other by the base element such that, when in expanded condition, they are pressed with a pressure-proof friction fit against the interior surface of the pipeline;
• and
• whereby a pressure-proof work space between the interior surface of the pipeline and the outer dimension of the bypass pipe is formed between the expanded sealing collars.