Process and arrangement for cleaning of pipe lines

Process for cleaning pipe lines, especially ventilation pipes and ventilation ducts in buildings, by means of a cleaning means, which is connected via a supply conduit to a source of pressure medium, and which exhibits one or more nozzle openings which are directed backwards toward the supply conduit at an acute angle relative to a center line which extends through the fastening of the supply conduit in the cleaning means, said nozzle opening in the form of a mainly continuous annular gap, which extends along the periphery of the cleaning means and which is connected to the supply conduit and the source of the pressure medium, the medium being made to discharge through the annular gap and partly clean inner walls of the line, and partly, by way of forces of reaction from the discharging medium, make the cleaning means move into the pipe line, wherein:

• (1) the cleaning means is brought into contact with an inner wall of the line;
• (2) a reduced pressure is established on opposite sides of the continuous annular gap;
• and (3) the cleaning means is made to move around about the cross-section of the line by twisting the supply conduit about its longitudinal axis.