Patent EA-000285-B1 (EA)
Title: Method of pipe repair and preparation for use of threaded oil pipes and mobile repair complex thereof
Inventor: KALININ O B
IPC: B23P6/00
Filed: 1997-05-30
Abstract: 1. Method of pipe repair and preparation for use of threaded oil pipes comprising that according to the technological process first the pipe curvature of each pipe is checked their sorting and cleaning, then further a linear and non-destructive method of a pipe body is performed threaded elements are inspected and rethreaded by machining operations, if needed, after which the pipes are pressurized, anti-scratching coating is applied on the pipe threaded elements, anti-corrosion coating is applied and further dried, after which the pipes are marked and collect into pipe columns, characterized in that the least worn threaded elements are restored by ultrasonics after which the quality control of the threaded elements is performed and a single technological stream of pipe repair is separated into two technological substreams: the first of which repairs the pipes with least worn threaded elements, subjecting them to the ultrasonic treatment, followed by hydraulic pressure tests sand further applying anti-scratch coating on the pipe threaded elements and the second repairs the pipes by mechanical machining of the most worn pipe threaded elements and the lest worn pipe threaded elements which failed to repair after ultrasonic treatment undergone in the first technological substream, after which the pipes are sent back to the first technological substream to subject threaded elements to ultrasonic treatment and pipes to hydraulic pressure tests and further applying anti-scratch coating on the pipe threaded elements, wherein the hydraulic pressure tests are combined the non-destructive test of the pipe body, using a method of acoustic emission, and between the ultrasonic treatment of the threaded elements and applying the anti-scratch coating on the threaded element of each pipe time is kept of lesser period of metal relaxation on the contact surfaces of threads. 2. Mobile repair complex, comprising technological equipment installed along the technological process and having all required mechanisms, including rolling stand with a device for checking pipe curvature, a unit for pipe cleaning, an apparatus pipe body diagnosis, a means for controlling of the threaded elements quality, equipment for rethreading threaded elements, using machining operations, apparatus for hydraulic tests with fixed pressing head and movable pressing plug, a unit for applying of anti-scratching coating on piped threaded elements, a device for cleaning the inner pipe surfaces, a unit for applying anti-corrosion coating on the pipe inner surfaces, putting final marking on pipes and a sorting stand, characterized in that the mobile repair complex is additionally provided with a marking means, units for ultrasonic restoration of pipe and coupling threaded elements and an apparatus for non-destructive control of a pipe body, using a method of acoustic emission, wherein the technological equipment is stationary mounted in mobile functional module blocks and additional marking means is mounted in the module diagnostics block, module block of the thread quality control is provided with the pipe handling means, wherein a device for ultrasonic restoration of coupling thread element is mounted above the entry pipe handling equipment and movable pressing plug for hydraulic test is mounted above the exit pipe handling means, while the fixed pressing head for hydraulic test and the device for ultrasonic restoration of pipe threaded element are mounted in the generator module block, and a transportation module block is placed between the block of the thread quality control and the generator module block and equipped with the pipe handling means, intermediate stand, arranged between the entry and exit pipe handling means and carriages, movably mounted in the guides to handle pipes to the devices of the ultrasonic restoration of the coupling and pipe threaded elements and, correspondingly to the movable and fixed pressing plug and head, wherein the apparatus for non-destructive control of a pipe body, using a method of acoustic emission, is mounted on a carriage, adjacent to the movable pressing plug for hydraulic tests.