Abstract: The present invention relates to a device and to a method for detecting at least the presence of gas hydrate crystals (10) formed by a fluid. The device according to the invention comprises: a polychromatic light source (2) likely to emit a radiation (20) at least in the visible spectrum; a body (3, 3?, 3?) comprising a reflecting surface (4) of predefined color in contact with the fluid; means for measuring a light intensity (5) as a function of wavelength, so arranged as to detect a radiation re-emitted in a non-specular manner (21) by reflecting surface (4) when it is illuminated by polychromatic light source (2); means for detecting at least the presence of hydrate crystals (10) from the light intensity measured as a function of wavelength and of at least one predefined threshold.

Abstract: A skin and a method for restructuring the inner surface of a tube of long length includes manufacturing a skin, in a material with expansion rate greater than 50%, the external surface of which includes a restructuring print determined in order to take into account the longitudinal and radial expansions that the skin is going to undergo, and as a function of the desired final surface state for the tube to be restructured, longitudinally expanding the skin up to the required length for the tube, longitudinally introducing expanded skin inside tube to be restructured, and radially expanding the skin to realize the restructuring.

Abstract: The invention relates to a method for making structured surfaces within pipes (1) lined with a coating and wherein fluids such as gas, hydrocarbons or water circulate. The invention consists in irreversibly deforming, during baking and/or drying, the coating internally applied by impression, via expandable means (16), for example a rubber bladder whose outer surface bears the structurations.