Russia has built the world's largest system of trunk pipelines, which has been in operation for several decades. In the process of long-term operation in the metal of pipes and welded joints, according to the results of in-line inspection, external and internal defects are detected, which are considered to be dangerous under the current rules of non-destructive testing. The nature of defects is different. Basically, these are defects of corrosion origin associated with the impact of corrosive media, mechanical damage to pipes and welded joints, welding defects formed during the production of welding and installation works during the construction of pipelines.
In order to ensure reliable and safe operation, in some sections of pipelines, perform the elimination of defects using various technologies. A special place among the repair technologies is occupied by repair technologies with the installation of repair structures, the main of which are steel and composite couplings, split tees, etc. Repair structures are used in cases where the use of other technologies is ineffective. The main requirement for repair is to prevent accidents and restore the bearing capacity of the pipeline for the entire period of operation of the repair facility. Preference to this or that method is given based, first of all, on the technical characteristics of the repair structure, simplicity, performance and manufacturability of repair, the volume of earthworks. In each case it is necessary to choose the best method of repair.
The article deals with topical issues of repair of oil pipelines with diameter from 159 to 1220 mm, as well as methods of testing of full-scale samples of pipes with installed repair structures.
References
1. Goncharov N.G., Gobarev L.A., Kolesnikov O.I. et al., Main pipelines linear part repair by means of cutting flanged tees (In Russ.), Truboprovodnyy transport: teoriya i praktika, 2010, no. 4, pp. 28–30.
2. But V.S., Velikoivanenko E.A., Oleynik O.I., Peculiarities of application of split tee-joints in repair and reconstruction of main pipelines in service conditions (In Russ.), Avtomaticheskaya svarka = The Paton Welding Journal, 2009, no. 9, pp. 32–38.
3. But V.S., Gretskiy Yu.Ya., Rozgonyuk V.V., Substantiation of a new approach for performing welding operations on pressurised pipelines (In Ukr.), Naft. i Gaz. Promyslovist, 2001, no. 4, pp. 33–39.
4. Makhnenko V.I., But V.S., Velikoivanenko E.A. et al., Determination of the permissible sizes of welded seams when installing tees and couplings on operating main pipelines (In Russ.), Avtomaticheskaya svarka = The Paton Welding Journal, 2003, no. 8, pp. 7–12.
5. Milne I., Ainsworth R.A., Dowling A.R., Stewart A.T., Assessment of integrity of structures containing defects, CEGB Report R/H/R6, Revision 3, 1986, April.
6. Shafikov R.R., Experimental substantiation of repair of main pipelines using welding technologies without stopping gas pumping (In Russ.), Territoriya Neftegaz, 2009, no. 4, pp. 48–51.
7. Shafikov R.R., Repair of trunk gas pipelines using welding and related technologies without stopping the transfer of gas (In Russ.), Territoriya Neftegaz, 2009, no. 6, pp. 80–83.
8. Mazel' A.G., Gobarev L.A. et al., The efficiency of welded couplings for the repair of defect of pipeline under pressure (In Russ.), Stroitel'stvo truboprovodov, 1996, no. 1, pp. 16–22.
9. Mazel' A.G., Gobarev L.A., Nagornov K.M., Rybakov A.I., Welded couplings for pipeline repair (In Russ.), Gazovaya promyshlennost', 1996, no. 9–10, pp. 55–57.
10. Zandberg A.S., Lopatin E.V., Gobarev L.A., Goncharov N.G., Evaluation of resistance of cylindrical couplings to axial loads during repair of annular joints of pipelines (In Russ.), Tekhnologiya mashinostroeniya, 2003, no. 1, pp. 32–35.
11. Zandberg A.S., Lopatin E.V., Gobarev L.A., Goncharov N.G., Evalution of the resistance of cylindrical couplings to axial loading in repair of circumferential joints in hihtlines, Welding International, 2003, V. 17, no. 10, pp. 813–816.
12. Goncharov N.G., Yushin A.A., Sudnik A.V., Development of repair components for selective repair of the pipelines (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2017, V. 7, no. 4, pp. 54–61.
13. Patent no. 2097646, Method of prevention of development of flaws in pipe line walls, Inventors: Golovin S.V., Goncharov N.G., Lopatin E.V., Mazel' A.G., Romanova I.A., Khomenko V.I., Gobarev L.A.
14. Goncharov N.G., Kolesnikov O.I., Yushin A.A., Filippov O.I., Study of the impact of low ambient temperatures on welding technology and properties of welded joints of main pipelines (In Russ.), Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktov = Science & Technologies: Oil and Oil Products Pipeline Transportation, 2016, no. 1, pp. 62–67.
15. Goncharov N.G., Kolesnikov O.I., Yushin A.A., A study of the impact of low ambient temperatures on weld technology and the properties of welded joints in trunk pipelines (In Russ.), Pipeline Science and Technology, 2017, V. 1, no. 1, pp. 57–63.
