RU2007140485A - METHOD FOR INJECTIC INJECTION OF THE INTERNAL SURFACE OF PIPES AND DEVICE FOR ITS IMPLEMENTATION - Google Patents

Abstract

1. The method of jet etching of the inner surface of the pipes, including loading and fixing the pipes in a certain position, treating their inner surface with a sequential feed with changing the direction of the etching solution, water and compressed air, unloading the pipes, characterized in that the etching solution is supplied with compressed air, each the pipe is alternately treated at three positions, while at the first position the etching solution is fed in one direction, then the purified compressed air in the same direction, at the second positions feed the etching solution in the opposite direction, then purified compressed air - in the same direction, water is supplied in the third position, then purified compressed air, the pipes are treated at each position with a stream breaking at the outlet. ! 2. The method according to claim 1, characterized in that for jet etching of pipes made of zirconium alloys using etching solution composition:! nitric acid, g / lot 450 to 550 free fluorine, g / lot 5 to 12 3. The method according to claim 2, characterized in that the content of free fluorine in the etching solution is 5 ÷ 7.5 g / L. ! 4. A device for blasting the inner surface of pipes, including a bed, a mechanism for feeding and unloading pipes, mechanisms for fixing pipes, a system for pumping through pipes substances that process the inner surface of pipes, consisting of pipelines, containers and taps, characterized in that the bed contains three working positions for processing pipes, mechanisms for feeding pipes to working positions, at each position seals are fixedly installed on the supply side of substances that process, and

Claims (7)

1. The method of jet etching of the inner surface of the pipes, including loading and fixing the pipes in a certain position, treating their inner surface with a sequential feed with changing the direction of the etching solution, water and compressed air, unloading the pipes, characterized in that the etching solution is supplied with compressed air, each the pipe is alternately treated at three positions, while at the first position the etching solution is fed in one direction, then the purified compressed air in the same direction, at the second positions feed the etching solution in the opposite direction, then purified compressed air - in the same direction, water is supplied in the third position, then purified compressed air, the pipes are treated at each position with a stream breaking at the outlet. 2. The method according to claim 1, characterized in that for jet etching of pipes made of zirconium alloys using an etching solution of the composition: nitric acid, g / l from 450 to 550 free fluorine, g / l from 5 to 12 water rest 3. The method according to claim 2, characterized in that the content of free fluorine in the etching solution is 5 ÷ 7.5 g / L. 4. A device for blasting the inner surface of pipes, including a bed, a mechanism for feeding and unloading pipes, mechanisms for fixing pipes, a system for pumping through pipes substances that process the inner surface of pipes, consisting of pipelines, containers and taps, characterized in that the bed contains three working positions for processing pipes, mechanisms for feeding pipes to working positions, at each position seals are fixedly installed on the supply side of substances that process, and movably along the Nina - means for receiving from the tubes with a gap jet substances performing processing, and a system for pumping through pipes substances performing processing further includes intermediate tank connected with pipelines, inlet pickling solution and compressed air, and are connected through seals to be handled tubes. 5. The device according to claim 3, characterized in that the bed is made inclined towards the discharge of pipes. 6. The device according to claim 3, characterized in that the mechanisms for fixing the pipes are made in the form of a carriage mounted on each position with the possibility of movement along the bed of the carriage with a span for feeding the pipe into the sealant and a mechanism for supplying reception means to the other end of the pipe with a jet break processing substances. 7. The device according to claim 3, characterized in that the means for receiving, with a break in the jet, the substances carrying out the treatment is made in the form of a receiving head and contains a sealed housing equipped with a sleeve that, in the working position, covers the end of the pipe with a ventilation pipe and manifold.