Compagnie Francaise Des Petroles

Claude J Colas

Bruno J De Sivry

Guy J Herve

Jean-Louis Migliarese-Caputi

Jean-Louis M Caputi

Michel Pierre Baylot

Pierre Baudet

The invention relates to the measurement of the ovalization of a ferromagnetic pipe. An electromagnetic pickup is moved in a circular path around the pipe, the pickup transmitting signals influenced by the radial distance between the pickup and the pipe. These signals are compared with signals from previous measurements made on a similar pipe to obtain indications of the radial distance between the pickup and the pipe so as to be able to deduce the transverse configuration of the pipe. The pickup is supplied with ac at a frequency of about 700 Hz and the signals from the pickup are compared with previously obtained signals both as to amplitude and phase. The pickup is mounted on a circular slide movable along a circular track supported on a U-shaped collar which is fixed to the pipe.

Apparatus for electromagnetically measuring the ovalization of a

The present invention relates to a heavy-duty metal brush particularly, but not exclusively, for removing anti-corrosion materials from an immersed metal surface. The brush comprises a compact assembly of radial strands of, for example, steel wire, which are applied against each other and are clamped between two metal plates, the diameter of which is less than that of the assembly of strands by at most 20 mm. In use of such a brush for removing an anticorrosion covering, the brush may be rotated at a circumferential speed of the order of 17 meters per second and may be mounted on a carriage adapted to roll over the surface on rollers and which is displaced either automatically or manually.

Rotary metal brush for removing submerged anti-corrosive covering and

A process for tapping a region of a pipe placed on a sea bed utilizes a working platform which is installed vertically above the region of the pipe to be tapped, the platform being adapted to receive a support girder which can be lowered from the surface of the sea onto the working platform and be engaged therewith and then lifted off the platform. The platform is adapted to receive successively a plurality of modular tool-carriers provided with tools for carrying out a variety of operations on the pipe, the operations including concrete stripping, removal of anti-corrosion covering, transverse cutting, internal brushing, and making the longitudinal weld flush. During the process, various of the operations are successively carried out on the pipe by the tool-carriers which are mounted successively on the support girder, each operation being separated from the next by raising the support girder to the surface, replacing the tool-carrier at the surface by a new tool-carrier to be used in the next operation, and by lowering the girder with the new tool-carrier onto the working platform.

Method and apparatus for tapping a submerged pipe

The invention concerns the removal of a concrete covering applied to an underlying surface provided with an anti-corrosion coating, for example that of a hydrocarbon-conveying pipe. The coating is removed by making trenches in the concrete to divide it into removable elements, the trenches being made using a cylindrical milling cutter having a longitudinal diamond-faced toothing and provided with a central stud of tungsten carbide projecting axially from the end of the cutter. In use the stud contacts the surface to prevent the surface being damaged by the toothing on the cutter as the cutter is moved transversely across the surface. To initiate a concrete covering removal operation, a hole is first drilled through the covering perpendicular to the surface for receiving the stud. The cutter is then moved perpendicularly to the surface through the concrete with the stud projecting into the drilled hole and until the stud contacts the surface. The cutter is then moved transversely over the surface to form the trenches.

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Nantes, France

Claude J Colas