Patent ID: 6886206

Claim:
Autonomous scraper for the anti-corrosion treatment of a pipe ( 10 ) wherein flows, in a stratified, wavy or wavy-stratified regime and under pressure (P), a corrosive multiphase liquid that contains a liquid phase ( 12 ) that flows off at the lower part of the pipe and to which is added a corrosion inhibiting liquid at the beginning of the pipe, and a gaseous phase ( 14 ) that is located at the upper part of the pipe or arch ( 18 ), wherein said scraper comprises: a cylindrical casing ( 20 ) mounted with clearance inside the pipe and equipped on its periphery with watertight means ( 27 ) that separate, within the pipe, an upstream side where said pressure (P) prevails from a downstream side, so that the casing is axially driven along the pipe under the effect of the pressure (P), means of uptake and projection ( 22 , 30 ) carried by the casing located downstream from the latter, and autonomous engine means ( 24 , 26 ) used to activate said uptake and projection means so that they take up the liquid in said liquid phase as the casing moves in the pipe and project it onto the arch.