Electricite De France

Electricite De France - Service National

Commissariat a L'energie Atomique

Claude Oberlin

Jean-Claude Lemarquis

Gerard Dohlen

Jean-Claude Le Marquis

Gerard Dolhen

Jean Le Bras

Pierre Strobel

Andre Hatterer

Philippe Morand

Daniel Bandura

A safety device for limiting the pressure of a fluid to a predetermined value comprises a preshaped diaphragm having a downstream convex face and an upstream convex face mounted as a closing or sealing device in a pipe. A first knife faces the convex face of the diaphragm at such a distance that a predetermined pressure exerted by the fluid on the concave face of the diaphragm brings the latter into contact with the knife which then causes a bursting of the diaphragm. A second knife is fitted to face the concave face of the diaphragm and a mechanism is provided for making the second knife strike against the diaphragm in order to bring about the tearing thereof when the concave face of the diaphragm is exposed by the fluid to a pressure below said predetermined pressure. The first knife has a passive operating mode, but the second knife has an active operating mode. With this latter mode, it is possible to burst the diaphragm at a pressure value which is well below that at which the diaphragm is burst by the first knife.

Diaphragm safety device with upstream active bursting knife

A groove is milled along a predetermined line using a cutter (2) mounted at the end of a rotary shaft (3) which is displaced under computer control (A) via a control interface (B) in such a manner as to ensure that its axis X.sub.4 remains constantly substantially perpendicular to the wall of the tube and that the depth to which the cutter penetrates into the thickness of the wall is under constant control.

Method and apparatus for machining the wall of a cylindrical tube by

The invention relates to a device for sealing an opening (7) defined by an edge (6), comprising a sealing element (2, 102), the dimensions of which are at least equal to those of the opening (7), means for securing the said sealing element opposite the opening, and means for ensuring fluid-tightness between the sealing element (2, 102) and the edge (6). The means for ensuring tightness between the sealing element (2, 102) and the edge (6) consists of a flexible membrane (8), means for fixing the circumference of this membrane to the sealing element (2, 102) so as to define a volume (16) between the membrane (8) and the sealing element (2, 102), and a communication hole (18, 32) provided in the sealing element so as to connect the volume (16) to a source of pressurized fluid.

Device for sealing an opening and slide valve comprising such a device

An isolation and protection device is suitable for being inserted and deployed inside tubing, in order, in particular, to collect swarf and foreign bodies during work on tubing which must be kept under a controlled gas atmosphere, or to act as a flow plug or as a heat shield. The device comprises:

Isolation and protection device for working on tubing, and in particular

The method comprises the steps of: digging out a continuous groove (13) in the wall of the tubing at the location of the tapping point to be made, said groove being slightly shallower than the thickness of the wall, thereby leaving a membrane (14) of metal at the bottom of the groove between the inside of the tubing and the outside atmosphere; placing a sealed isolation unit on the tubing, said unit covering a wide area which is at least equal to the area delimited by the groove; breaking the metal membrane so as to make an opening in the wall of the tubing; removing the cut out portion of the wall; welding on a blind tail pipe; and removing the sealed isolation unit. The invention also provides a groove-digging device, and a membrane-breaking punch device (600).

Method for tapping into tubing under a controlled atmosphere, in

The method consists in subjecting a mixture of an alkali nitride and/or an alkaline-earth nitride to thermal decomposition in vacuo in the presence of at least one metallic component with which it is desired to alloy the alkali metal and/or the alkaline-earth metal, the metals thus brought together are melted and the alloy thus obtained is homogenized.

Growing community of inventors

Avon, France

Claude Oberlin