The method of repair of main pipeline (mg)of high pressure, defective insulation coating (contact tube-case), located under the roadway and crossing the highway

 

The invention relates to the construction and used in the repair of underground pipelines. Open the ground to provide access to the case and to determine the spatial position of the pipe relative to the casing largest gaps between the pipe and casing. Produce specification mutual spatial position of the pipe and casing after removing soil around the casing at a distance of 0.4-0.6 m from the base of the embankment on each side of the road. To do this evenly around the circumference of the drill pipe in her eight through holes with a diameter of 10-12 mm, through which the probe is used to measure the magnitude of the gaps between the pipe and casing and compare them with previously obtained results. Mechanical influence on a pipe of the pipeline, through the openings in the case are introducing foam into the gap between the inner surface of the case and the outer surface of the pipe. Measure electric potentials to determine the absence of contact of the pipe-case, additional sealing gaps pipe-case and produce backfill soil. Improves the reliability of the pipeline. 1 C.p. f-crystals, 4 Il.

1.The technical FIELD,

The invention relates to the field of gas transportation in private violations of insulation coating (physical contact pipe - case), laid under the road surface and intersecting thoroughfares.

The aim of the invention is the provision of operational reliability characteristics of the MG, while maintaining traffic on roads in the area of repair and reduction of material and labor resources due to the lack of necessary capital repairs transition MG over the roadway and restore the last.

2. The LEVEL of TECHNOLOGY

The sections of pipelines laid on the crossing of the railway and automobile roads of all categories, performed, usually in a protective case (casing) of the steel pipe, the ends of which are brought to a distance of 8-10 m from the edge of the roadbed. The ends of the protective casings have the seal of dielectric material, at one end of the case installed exhaust candle to control pollution. Trumpet MG before pulling through the case is isolated and poteryatsa around the perimeter of the entire length of the pieces of wood fastened together with wire.

In the process of exploitation MG for a number of reasons (substantial longitudinal force when the change is difficult-stress state of a pipe or deformations developed wsoc on the pipe and the casing due to the phenomena of pucini soil, the vibration from traffic on the case and modes of transport gas pipe MG and so on) occurs tapping pipe case, which entails an unacceptable violation of pipe insulation inside the case (the contact tube-case). The detection of the contact tube cartridge is carried out by comparing the results of measuring the electrical potential of the pipe and casing relative to the earth. The presence of a contact tube-case leads to corrosion of the pipe wall and, consequently, to the destruction of the pipe with all the ensuing consequences. Analogs of the invention are, in particular, patents No. 1814712 A3, F 16 L 55/18, “Method of repair of pipelines” and No. 2154228 C2, 7 F 16 L 59/00 “Device and method for thermal and/or acoustic insulation of the pipeline.”

The prototype and the analogue of the present invention is a method of repair of transitions MG through roads and Railways, carried out with or without replacement pipe in accordance with the “Rules of work with the repair of gas pipelines. VSN 51-1-97”. - M, IDC GAZPROM, 1997 and the regulations on capital repair of crossings of trunk pipelines across the road. Addition to VSN 51-1-97”. - M, IDC GAZPROM, 1999.

ruby includes:

the development of the pit on both sides of the road for the opening section of the working string and the ends of the case and ensure dismantling, as well as the reverse installation of the repaired scourge MG;

cutting dismantled section of the working string from the main thread MG, removal of seals at the ends of the case and lining (crates) from the annulus;

- removing the cut portion of the tube from its case and recoat;

- the lining of the scourge and the strength test and tightness;

- vacation, dragging renovated scourge MG every case, hydraulic testing of transition and adjacent areas, welding to the main thread MG, inspection of welded joints;

- sealing the annulus at the ends of the pipe-case, isolation joints of pipes, backfilling of the pit.

This overhaul of the transitions of MG across the road is, as a rule, stopping traffic on the highway. However, in practice became widespread method turnarounds transitions MG over the road having physical contact pipe-case, without stopping traffic, which includes:

- development of the pit on both sides of the road and the dismantling of the annular seal at stake the electric potentials of the pipe and casing;

- reduction in operating pressure in MG to 30%, the determination of the spatial position of the pipes MG in the case by the values of the gaps between the pipe and casing;

mechanical stress on the pipe in the area of the exit pipe from the casing in the direction from the smaller gap greater with the purpose of changing the position of the pipe in the pouch and removing contact;

- restoration of the annular seal on the end of the case and backfilling of pits.

Moreover, the application of this method does not guarantee to eliminate contact of the pipe-case due to the fact that the direction of force on the pipe in this method is not exact and, moreover, may be the opposite, i.e. instead of eliminating physical contact pipe-cartridge contact patch increases. In particular, in practice, there are cases when the trumpet MG has a deformation within the limits of elasticity caused by the action of the longitudinal and transverse forces from the effect of shrinkage of the soil or the infringement of technology of pulling through pipes in case or failure to comply with longitudinal geometric shape of the case (broken on one or more welded joints in pipe case).

3. The INVENTION

Unlike analogs and prototypes when Troubleshooting contact the pipe-case on the and of the pit on both sides of the road for the opening of the pipeline (MG), and disassembly of the seal tube seal at the end of the case in order to remove moisture;

- drying pipes MG inside the case when natural ventilation and the measurement of electric potentials pipe and casing;

- reduction in operating pressure in MG to 30%, the determination of the spatial position of the pipes MG in the case by the values of the gaps between the pipe and casing;

- development of additional pits stamped on bottom of 0.8-1.0 m below the bottom of the pipe casing at a distance of 0.4-0.6 m from the base of the embankment of the road;

- Stripping case, the markup section and drilling at equal intervals along the circumference of the cross section eight through holes with a diameter of 10-12 mm in the pipe wall of the case;

- measurement of clearances between the inner surface of the pipe casing and the outer surface of the pipe MG probe through holes with a diameter of 10-12 mm, drilled in the casing;

- the same in the place of exit pipes MG of the case;

- comparison of the magnitudes of the gaps measured in both sections, the determination of the spatial position of the pipe within the casing and direction of force on the pipe MG at the point of the cross section of the pipe outlet of the casing;

- a force on the pipe within the limits of elastic deformation to some earlier point, the measurement of electrical potentials to determine the correct contact and fixed the century or two holes with a diameter of 10-12 mm (usually from smaller gap) for discharge into the space between the pipe and casing polyurethane foam type “Komi - Tech” or similar.

- forcing the foam annulus in the amount of not less than 20 DM3(depending on pipe diameter case), exposure 40-60 min, withdrawal of forces acting on the pipe in place out of the case;

- welding of holes with a diameter of 10-12 mm, the recovery of the insulation case;

- sealing the annulus at the ends of the pipe-case, isolation joints of pipes, backfilling of the pit.

According to the authors, the proposed solution has the following differences from the prototype and analogues:

additional determination of the position of the pipes MG in the case through the holes 10-12 mm, to determine where physical contact of the pipe with case and directions of the forces acting on the pipe (within the magnitude of elastic deformation) to eliminate contact of the tube-pouch;

- forcing through selected based on preliminary measurements holes 10-12 mm in the space between the pipe and the case of polyurethane foam, which not only captures the achieved position of the pipe relative to the case, but, unlike shown in the analog sessionscope impact on the trumpet MG in the desired direction in relation to the case.

4. LIST of DRAWINGS AND OTHER MATERIALS

4.1. Figure 1 - scheme of transition of MG through the roadway. Figures represent the elements of the transition.

4.2. Figure 2 - scheme of the transition MG with physical contact, trumpet-Chuck indicating the method of measuring the electric potentials of the tube and cartridge.

4.3. Figure 3 - scheme of the repair transition MG over the roadway according to the prototype.

4.4. Figure 4, 4a - repairs scheme of transition of MG across the roadway in the attached way. The diagram shows the location of additional pits, holes with a diameter of 10-12 mm, table measuring gaps and determine the direction of force on the pipe and the optimum point of injection of the foam, the installation position of the jacks.

5. INFORMATION CONFIRMING the POSSIBILITY of carrying out the INVENTION

The proposed method renovated transition of the main gas pipeline Tula - Shostka - Kiev, Dy1000, across the road Bryansk - Gomel, having physical contact tube - case. The work was carried out in the following sequence:

after marking and carrying out prospecting ensures MG, with the aim of identifying the ends of the case, on both sides of the road at a distance of 8-10 m from the base of the mounds were dug pits globonautes seal the pipe-case, annulus dried by the method of natural ventilation;

at a distance of 0.4 m from the base of the mound excavated two additional pit (on both sides of the road) with the mark of the bottom of 0.8 m below the generatrix of the case, in which case, the diameter of which was 1220 mm, was performed 8 through holes with a drill diameter of 11.8 mm, the gaps between the pipe MG and the inner surface of the pipe casing was measured with a probe (“Columbia” caliper);

- the results of measurements were selected direction and made a force on the pipe MG Jack lifting capacity of 25 tons in the selected direction, the Jack was installed directly in the trench;

- after the disappearance of contact “trumpet-case”, before removing the Jack from the side of the smallest gap between the pipe and casing is introduced foam mounting “Komi-Tech” in the amount of 40 cm3made exposure 60 min and removed the Jack;

the result of measurement of electric potentials showed no contact “trumpet-case”, after removing the Jack;

- holes with a diameter of 12 mm were welded by the electrodes e-46 (Mr-3), welds insulated bitumen mastic and tape “Police”;

- restored the mechanical seal made sasip what about the defect corrected.

Claims

1. The method of repair of main pipeline (MG) of high pressure, defective insulation coating (contact tube-case), located under the roadway and crossing the highway, which consists in opening the ground to provide access to the case, the determination of the spatial position of the pipe relative to the casing largest gaps between the pipe and casing, mechanical stress on the pipe MG, the measurement of electrical potentials to determine the absence of contact of the pipe-case, the secondary seal gap pipe-case, backfilling, characterized in that what is produce clarification mutual spatial position of the pipe and casing after removing soil around the casing at a distance of 0.4-0.6 m from the base of the embankment of the road on each side, and uniform around the circumference of the pipe drilling in him eight through holes with a diameter of 10-12 mm, through which the probe is used to measure the magnitude of the gaps between the pipe and casing and compare them with previously obtained results.

2. The method according to p. 1, characterized in that to increase the impact on the pipe and defect elimination insulating coating in the area of the minimum is Enna surface of the case and the outer surface of the pipe.

 

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