V&m Deutschland Gmbh

V & M France

Vallourec Tubes France

Andreas Groos

Stefan Nitsche

Xiaoxing Guo

Nicolas Nourrit

Alejandra Segura

A device for checkivng steel pipes during production and to a method using the device. The device includes a station for acquiring measurement data representative of physical measurements of the geometry of a pipe taken on an outside thereof, and a computer system configured to store template data applicable in a coordinate system and representative of overall geometry of a sizing body. In a chosen coordinate system, the system then provides a three-dimensional representation of parts of the pipe. For each part of the pipe, the system is referenced to determine a critical parameter, representative of the margin of passage of the sizing body inside a chosen part of the pipe. The method and device may thus establish a diagnostic of traversability of the pipe by a sizing body.

Production control method and device for checking the traversability of pipes

In a method for the nondestructive testing of pipes made of ferromagnetic steel for flaws by means of stray flux, the pipe is magnetized by a constant field and the discontinuities in the near-surface region of the outer or inner surface of the pipe cause magnetic stray fluxes, which exit the pipe surface and are detected by probes of a test unit, wherein the association of the detected amplitude signals is performed on the basis of the amplitude height and/or the frequency spectrum with respect to an external or internal flaw via defined flaw thresholds respectively. For this, prior to associating the detected amplitude signals to an external or internal flaw, the angular position of the flaw relative to the respective magnetic field direction is determined, and a correction of the signals is carried out via a previously determined correction factor for amplitudes and/or frequencies of a perpendicular angular position.

Method for the nondestructive testing of pipes

The invention relates to a process for the destruction-free testing of metallic pipes, in particular seamlessly produced steel pipes, in which method the entire length of the pipe is scanned following the circumference precisely and in this case, in addition to the wall thickness (WD) and the external diameter (D) being determined, the inner and outer surfaces of the pipe are examined for faults, the faults determined in this process are compared with a predefined permissible reference fault depth RFT (RFT=fault threshold of&#xd7;% of the nominal wall thickness), the pipes are sent to reworking means if the fault threshold is exceeded, and a requisite minimum wall thickness (WD) has to be present in the reworked region after the processing has been carried out. For this purpose, the invention provides for the pipes containing faults to be released for reworking only when the determined geometrical parameters have been correlated with one another beforehand in an evaluation step, and the following conditions are met: WD&#x2212;RFT&#x3e;WDfor faults on the inner and outer sides of the pipe and D&#x2212;RFT&#x3e;Dfor faults on the outer side of the pipe.

Method for nondestructive testing of pipes

The invention relates to a method for testing the driftability of metal tubes, wherein a cylindrical drift body having a defined diameter and a defined length is guided through the tube with defined force for ensuring a predetermined internal diameter and a minimum straightness. Virtual drifting is hereby performed instead of the physical drift operation.

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Rheurdt, Germany

Andreas Groos