Patent EA-001806-B1 (EA)
Title: Process for preparing to operation and remedy repair of threaded oil and gas pipes and an arrangement therefor
Inventor: KALININ OLEG BORISOVICH
IPC: B23P6/00
Filed: 1999-06-01
Abstract: 1. A process for preparing to operation and remedy repair threaded oil and gas pipes and an arrangement therefor, characterized by sorting of pipes, unrepairable by curvature requirements, cleaning of pipes, input line control, diagnosis and classification of pipe and coupling bodies, input control by "interference fit" parameter of threaded elements, an additional technological marking are carried out in an integral technological line of pipes assembly with couplings, after which that integral technological line is divided into technological streams by the condition of thread wear, where ultrasound and mechanical treatment of threads of pipes and couplings are performed, screwing together pipes and couplings, applying anti-scratch coating on a thread, hydro tests of a pipe assembly with a coupling combined with acoustic-emission control, output control by "interference fit" parameter, marking and completeness of pipes using automatic control system (ACS), maintaining the time between ultrasonic treatment of threads and applying anti-scratch coating, span of time is shorter than the period of relaxation τp of metal treated by ultrasound, characterized in that after cleaning pipes all technological operations are carried out using automated control system as expert and/or control, wherein prior to the input control, a closed thread connection of a pipe with a coupling is unscrewed, tightly screwed in a plant's condition, a virtual additional technological marking of a pipe and a coupling are carried out using the automated control system, the coupling is directed to an additional technological stream of coupling treatment, an input optical multi-parameters control of the thread quality, including former in a closed connection pipe-coupling, is carried out, and diagnosis of portions of pipes and couplings bodies under former thread, where the wall thickness is close to minimum, the results of the input control, including data of the coupling material strength, are loaded to the operation database of the automated control system and, according to the technical requirements set by the automated control system determine actual state of pipes and couplings to change a number of technological operations and regimes of treatment in an integral technological line, pipes are trouble shot to potentially repairable to obtain pipes of a certain class and distribute them to technological streams for further treatment with individually set regimes and conditions of treatment, wherein at the outlet of the technological stream of coupling treatment an optical multi-parameter control is performed and after span of time limited by the period of relaxation τp after ultrasound of pipe thread screw into a closed threaded connection of mutually selected pairs of threads according to the strength groups and parameters of geometry using the automated control system, the pairs being preferably in former threaded connection with each other, output optical multi-parameter control of pipe thread is performed, laser automatic pipe marking is conducted and according to it data of class and pipe parameters and of operations performed with pipe and coupling are loaded to the database of the automated control system, and pipes of the needed type are completed. 2. An arrangement as claimed in claim 1, which comprises equipment arranged along an integral technological process in functional module blocks movable assembled and associated with each other by a computer network of the automated control system and conveyor means, comprising an input pay-out stand with a device for checking a pipe curvature, a unit pipe cleaning, a device for diagnosis and nondestructive control of a pipe body, a device of the input control of thread elements by "interference fit" parameter, and a device for an additional technological marking, facilities for repair threaded elements by mechanical treatment, including thread-cutting lath, a device for ultrasound treatment of coupling threads, a unit for pipe hydro tests, a device for acoustic emission control during hydro tests, an apparatus for applying anti-scratch coating on threads, a unit for applying anti-corrosion coating on pipe inner surface, a device for final marking, a sorting stand and an input device for loading information of marked pipes to the database of the automated control system, characterized in that the arrangement further comprises a section of coupling and an additional thread-cutting lath, devices of input and output optic multi-parameter control of thread elements including by "interference fit" parameter, a unit for checking quality of pipe elements control, a device for laser automatic pipe marking, wherein at the entrance of the arrangement to the device for diagnosis and nondestructive control of a pipe body, distributing the main stream to technological substreams of pipe and coupling treating, one of thread-cutting laths is mounted in the position corresponding to unscrewing of plant's connection of coupling releasing once tightened pipe threaded element, the other thread-cutting lath is positioned between the device for ultrasound treatment of pipe threads, once opened, and the unit for pipe hydro tests, wherein the position of the lath corresponds to a final tightening of once tightened coupling threaded element and pipe threaded element, once tightened, and the section of coupling treatment is associated via a coupling conveyor with the first coupling thread-cutting lath and positioned at the turn of technological streams of pipe and coupling treatment before another coupling thread-cutting lath, wherein device of input optic multi-parameter control of pipe threaded elements including by "interference fit" parameter, is positioned after the device for diagnosis and nondestructive control of a pipe body and is associated with the automated control system via a block of virtual additional pipe marking and a block of expert processing of the control data, and the device of output optic control of pipe threaded part via a block of reading virtual number of a pipe is associated with the database of the automated control system and with the device for laser pipe marking.