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.
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.
Apparatus for removing surface layers from workpieces, especially for descaling hot rolled stock moved with respect to the apparatus, by spraying highly pressurized fluid, especially pressurized water on both sides of the rolled stock from rows of nozzles extending across the workpiece width and each including a plurality of nozzle heads is characterized in that the nozzle heads rotate and each nozzle head comprises at least one nozzle, preferably a plurality of nozzles uniformly distributed around its circumference. The number of nozzles, the rotary speed of the nozzle heads, and the speed of relative motion between the rolled stock and the apparatus are tuned such that desired average intensity and depth of removal are obtained.
There is mentioned an air nozzle/flexible whip cleaning means for ductwork which is connected to a source of high pressure air using at least a plurality of connectable lengths of semi rigid plastic pipe 8. The means comprises at least one primary air nozzle 1 to which a flexible tubing whip 4 may be attached. At least one round headed reverse air nozzle 11 and at least one round headed forward air nozzle 12 may be included, the purpose of the nozzle heads and flexible tubing whip being to direct air in different directions as helpful for the purpose of removing dust, debris and unwanted foreign matter from the interior of ductwork.
