Abstract: A process and a moveable container for pickling a metal piece after welding is disclosed in which process the metal piece is brought into contact with an acid surface-treatment agent in the area of the welded joint and the heat-affected zone, the surface treatment agent is allowed to act on the area for a set period of time, the surface treatment agent is removed from the surface of the metal piece with the aid of a neutralizing wash fluid, the wash fluid is chemically treated with an alkalizing agent and an agent that increases the floc size, the chemically treated wash fluid is taken for clarification to form a clarified liquid and a sediment, the heavy-metal waste accumulated during clarification is taken to a hazardous waste treatment plant.

Abstract: Method and device for drilling holes into a mantle of a cylinder of a paper machine, in particular a drying cylinder, while the cylinder is in its site of operation in the paper machine in which a drill carriage having drill bits is supported on the cylinder being drilled. The drill carriage is locked in a fixed position relative to the cylinder being drilled the drill bits are pressed into the mantle of the cylinder to be drilled and rotating to thereby drill holes in the cylinder mantle. The drill carriage is supported on the cylinder being drilled by a first set of wheels arranged on the drill carriage during drilling and is displaced upon rotation of a second set of wheels which contact the cylinder only for axial movement and not during drilling.

Abstract: A method for drilling holes into a mantle of a cylinder of a paper machine while the cylinder is in its site of operation in the paper machine. The holes are drilled into the cylinder mantle by a drilling device having drill bits and which is transferred after each drilling cycle to the next drilling position. When drilling the holes, the device is supported on cylinders placed adjacent to and above the cylinder to be machined and/or on the cylinder to be machined by fastening supports of the device. Before the drilling is started, the device is locked in its position by locking fastening supports in a desired position and, the holes are drilled into the cylinder placed underneath from the top toward the bottom.