摘要:
The invention relates to a device for applying a plastic sheathing to connections of a pipeline comprised of steel pipes (2a, 2b), said connections being produced by circular weld seams (1). The steel pipes are provided with a plastic insulation (3a, 3b) at the factory, and are subsequently insulated in the area of the circular weld seam (1) by means of injection molding. The inventive device comprises a split injection molding die (4). Said injection molding die can be attached to an injection molding device, can be placed and fastened in a sleeve-like manner around the steel pipes (2a, 2b) in the area of the weld seam such that the injection molding die (4) overlaps the end of the plastic insulation (3a, 3b), which is provided at the factory, of both steel pipes (2a, 2b) that are joined to one another by welding. The injection molding die (4) has, at least in the axial area between the plastic insulations that are provided at the factory, an inner diameter (3a, 3b) that corresponds to the outer diameter of the plastic sheathing, which is to be produced, in the area of the weld seam. In addition, the injection molding die also has, on its faces (5a, 5b), an inner diameter that corresponds to the outer diameter of the plastic insulation (3a, 3b), which is provided at the factory. A cooling device (6a, 6b), which runs in a circumferential direction, is arranged in the area of the faces (5a, 5b) of the injection molding die (4).
摘要:
The invention relates to a method and device for monitoring and detecting coating defects (6) in a defined section of a coated underground or underwater pipeline (1) which is provided with a monitoring unit (2) fixedly mounted by sections and at the ends of the respective section. The inventive method consists in applying an alternating current signal in a clock manner on the pipeline, in recording the waveform thereof in the monitoring units of the two ends of the respective monitorable section for determining the distance-dependent damping rate, in converting a time-dependent signal into a frequency-dependent signal, in determining the amplitude of a frequency corresponding to the alternating current signal frequency, in determining the damping rate of the frequency amplitudes in the pipeline monitorable section and in comparing with predetermined comparison values in the monitoring units of the two ends.
摘要:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Vorwärmung eines Rohrstrangs (4) im Bereich von Rundschweißnähten (5) für eine nachfolgende Aufbringung einer Kunststoffummantelung (6) (Nachisolierung), wobei die Nachisolierung zeitlich dicht auf den Vorgang des Rundnahtschweißens folgt. Dabei wird zur Erzielung einer möglichst gleich hohen Oberflächentemperatur im Bereich der Nachisolierung die Vorwärmung in der Weise durchgeführt, daß im Verlauf der axialen Länge des Bereichs der Nachisolierung auf die Rohroberfläche bezogen unterschiedliche Wärmeenergiemengen in den Rohrstrang (4) eingebracht werden, wobei der Wärmeenergieeintrag im Nahbereich der Rundschweißnaht (5) jeweils geringer gehalten wird als in den beiderseits daran anschließenden Endbereichen des Bereichs der Nachisolierung.
摘要:
The invention relates to a device for applying a plastic sheathing to connections of a pipeline comprised of steel pipes (2a, 2b), said connections being produced by circular weld seams (1). The steel pipes are provided with a plastic insulation (3a, 3b) at the factory, and are subsequently insulated in the area of the circular weld seam (1) by means of injection molding. The inventive device comprises a split injection molding die (4). Said injection molding die can be attached to an injection molding device, can be placed and fastened in a sleeve-like manner around the steel pipes (2a, 2b) in the area of the weld seam such that the injection molding die (4) overlaps the end of the plastic insulation (3a, 3b), which is provided at the factory, of both steel pipes (2a, 2b) that are joined to one another by welding. The injection molding die (4) has, at least in the axial area between the plastic insulations that are provided at the factory, an inner diameter (3a, 3b) that corresponds to the outer diameter of the plastic sheathing, which is to be produced, in the area of the weld seam. In addition, the injection molding die also has, on its faces (5a, 5b), an inner diameter that corresponds to the outer diameter of the plastic insulation (3a, 3b), which is provided at the factory. A cooling device (6a, 6b), which runs in a circumferential direction, is arranged in the area of the faces (5a, 5b) of the injection molding die (4).
摘要:
Die Erfindung betrifft ein Verfahren und eine Vorrichtung zur Vorwärmung eines Rohrstrangs (4) im Bereich von Rundschweißnähten (5) für eine nachfolgende Aufbringung einer Kunststoffummantelung (6) (Nachisolierung), wobei die Nachisolierung zeitlich dicht auf den Vorgang des Rundnahtschweißens folgt. Dabei wird zur Erzielung einer möglichst gleich hohen Oberflächentemperatur im Bereich der Nachisolierung die Vorwärmung in der Weise durchgeführt, daß im Verlauf der axialen Länge des Bereichs der Nachisolierung auf die Rohroberfläche bezogen unterschiedliche Wärmeenergiemengen in den Rohrstrang (4) eingebracht werden, wobei der Wärmeenergieeintrag im Nahbereich der Rundschweißnaht (5) jeweils geringer gehalten wird als in den beiderseits daran anschließenden Endbereichen des Bereichs der Nachisolierung.