Abstract: A process for cleaning pipelines and especially ventilation pipes and ducts in buildings, and includes a nozzle connected to a supply conduit through which a pressurized medium can flow. The arrangement includes a nozzle opening directed forward away from the supply conduit. The nozzle opening is in the form of a large continuous annular gap which extends along the periphery of the nozzle and is connected to the supply conduit and the source of a pressurized medium. The gap directs the medium toward the inner walls of the pipe or duct and effects a cleaning of the inner walls. The nozzle is moved into the pipe or duct by moving a rigid supply conduit.

Abstract: An arrangement is provided for cleaning pipelines and especially ventilation pipes and ducts in buildings, and includes a nozzle connected to a supply conduit through which a pressurized medium can flow. The arrangement includes a nozzle opening directed back toward the supply conduit. The nozzle opening is in the form of a large continuous annular gap which extends along the periphery of the nozzle and is connected to the supply conduit and the source of a pressurized medium. The gap directs the medium toward the inner walls of the pipe or duct and effects a cleaning of the inner walls. The nozzle is moved into the pipe or duct as a result of reaction forces generated from discharge of the pressurized medium through the nozzle opening.

Abstract: There is mentioned a process and an arrangement for cleaning of pipelines, and especially ventilation pipes and ventilation ducts in buildings, by means of a largely spherical cleaning means (1) which is connected via a supply conduit (2) with a source of pressure medium, and which exhibits a nozzle opening in the form of a largely continuous annular gap (6) which extends along the periphery of the cleaning means (1) and which is connected to the supply conduit (2) and the source of pressure medium. The medium is made to discharge through the annular gap (6) in order partly to clean inner walls of the line, and partly, as a result of the forces of reaction from the discharging medium, to make the cleaning means (1) move into the pipeline. The cleaning means (1) is brought into contact with an inner wall of the line in that a reduced pressure is established between the cleaning means (1) and the inner wall and it is made to move around about the cross-section of the line by twisting of the supply conduit.