Patent EA-003615-B1 (EA)
Title: Method of repairing a pipe and arrangement therefor (variants)
Inventor: BAZAROV ALEXANDER YURIEVICH
IPC: F16L55/18
Filed: 2002-08-13
Abstract: 1. A method for repairing a pipe, comprising placing a shell around a damaged part with an axial symmetry and provided with jets forming a circular space therebetween, sealing the shell ends and injecting a compound to fill the space between the shell and the pipe, prior to the compound injecting an outlet is provided from the circular space to the ambient atmosphere, the compound is injected through one or several jets to full filling of said space, characterized in that the space is filled in two stages, at the first stage of the compound filling the zone of the damaged part is controlled and continued until complete filling the zone with the compound after which the second stage is effected. 2. The method according to claim 1, characterized in that the damaged zone communicates with an ambient atmosphere through at least one outlet made in the shell and the filling is controlled visually by the compound appearance in said outlet. 3. The method according to claim 1, characterized in that the first stage of the circular space filling with the compound is effected for 10-40 minutes after which the jet is closed and filling is continued through another jet arranged in the bottom part of the shell. 4. The method according to claim 1, characterized in that at the first stage of the circular space filling the compound level is controlled in the space being filled, The first stage continues until reaching a predetermined level in the space above the damaged zone. 5. The method according to claim 4, characterized in that the distance from the compound level to the damaged zone is from 0,05 to 0,2 of the pipe diameter being repaired. 6. The method according to claim 1, characterized in that the compound is injected into the circular space at an overpressure from 3 to 10 bar. 7. The method according to claim 1, characterized in that the circular space is filled with a compound based on epoxy resin with dynamic viscosity of the compound 20-100 Pa(s and a gelation period for 30-120 minutes. 8. A method for repairing a pipe, comprising placing a shell around a damaged part with an axial symmetry and provided with jets forming a circular space therebetween, sealing the shell ends and injecting a compound to fill the space between the shell and the pipe, prior to the compound injecting an outlet is provided from the circular space to the ambient atmosphere, characterized in that the circular space communicates with the ambient atmosphere through a jet in the bottom part of the shell, the filling is effected in two stages, during the first stage the compound is injected through one or several jets arranged in the bottom part of the shell and filling is stopped when the compound appears in said jet after which the jet is closed and the circular spaces communicates with the ambient atmosphere through one or several outlets in the upper part of the shell and repair enters into the second stage of the compound filling and the process continues until the compound appears in the outlets communicating the circular space with the ambient atmosphere. 9. The method according to claim 8, characterized in that in the first or second stage the upper jet is closed while the bottom jet continues filling the compound into the circular space. 10. The method according to claim 8, characterized in that during the second stage filling is continued until the compound appears in all outlets communicating the circular space with the ambient atmosphere after which they are closed. 11. The method according to claim 8, characterized in that the first stage lasts for 1-7 minutes, the second stage for 5-25 minutes. 12. The method according to claim 8, characterized in that the compound is injected into the circular space at an overpressure from 3 to 10 bar. 13. The method according to claim 8, characterized in that the circular space is filled with a compound based on epoxy resin with dynamic viscosity of the compound 20-100 Pa(s and a gelation period for 30-120 minutes. 14. The method according to claim 8, characterized in that when the compound consumption drops below certain predetermined value the jet is closed and the compound injection is continued through the bottom jet. 15. The method according to claim 14, characterized in that said predetermined value is 1 to 10 l/min. 16. The method according to claim 8, characterized in that when the time filling the circular space with the compound exceeds the predetermined period the jet is closed and the compound injection is continued through the bottom jet. 17. The method according to claim 16, characterized in that said predetermined period is 10 to 40 minutes. 18. The method according to claim 8, characterized in that when the time from the first stage of filling to filling said bottom outlet with the compound exceeds the predetermined period the jet is closed and the compound injection is continued through the bottom jet. 19. The method according to claim 18, characterized in that said predetermined period is 2 to 5 minutes. 20. The method according to claim 8, characterized in that when the time from the second stage of filling to filling said bottom outlet with the compound exceeds the predetermined period of time the jet is closed and the compound injection is continued through the bottom jet. 21. The method according to claim 20, characterized in that said predetermined period is 10 to 40 minutes. 22. The method according to claim 8, characterized in that if no compound appeared in the outlet after certain predetermined period of time the jet is closed and the compound injection is continued through the bottom jet. 23. An arrangement for repairing a pipe, comprising a shell placed around a damaged part with an axial symmetry and provided with jets and oulets, the inner shell diameter exceeds the outer pipe diameter, at least one through hole is provided in the shell directly in the damaged zone, characterized in that an additional jet is provided in the shell bottom part for injecting the compound, at least one of said jets for compound injection and said additional jet are arranged in the shell bottom part at different shell ends, the arrangement comprises a closing means for closing said additional jet. 24. The arrangement according to claim 23, characterized in that the additional jet is arranged from the nearest shell end at a distance not exceeding 0,3 of the shell length along the pipe axis. 25. The arrangement according to claim 23, characterized in that comprises a transparent hose connected to the additional jet and a closing means for closing the hose or the additional jet. 26. The arrangement according to claim 23, characterized in that the angle between the downward direction and the direction to the additional jet does not exceed 60 degree . 27. The arrangement according to claim 23, characterized in that the hole has a diameter from 5 to 15 mm, made upstream of the defect at a distance from 2 to 4 of its own diameters, the inner shell diameter exceeds the outer pipe diameter by 5 to 40 mm.