RU2730132C2 - Device for tight closure of internal cavity of oil product pipeline or oil pipeline - Google Patents

Abstract

FIELD: transport machine building.

SUBSTANCE: invention relates to means for stopping flow from pipes or pipes by introducing an element expanding into place into pipe. Device for tight closure of the inner cavity of pipeline (1) contains a closed tight inflatable shell (2) and ring-shaped shell (6). Both shells are installed in inner cavity of pipeline (1). On outer surface of both shells there is sealing belt (3) and (7) with ribs (4) and (8) respectively. In shells (2) and (6) gas is supplied through holes (5) and (9) respectively. Due to expansion of shells and thrust of their sealing belts (3) and (7) in walls of pipeline (1), inner cavity of pipeline (1) is sealed. Through hole (15) of annular second shell (6) passes pneumatic line (10), which supplies gas into first shell (2), and tube (11) for control of medium between shells (2) and (6). At inflation of second shell (6) the gap between it and pneumatic line (10) and tube (11) passing through it is sealed. First and second shells (2) and (6) are made of material based on elastic synthetic fabric (12) with breaking load of not less than 300 daN/5 cm in longitudinal and transverse directions and tear resistance of not less than 35 daN in longitudinal direction and 30 daN in transverse direction, and on both sides of said fabric (12) there is coating (13) and (14) of thermoplastic polyurethane. Sealing belts (3) and (7) are made from polyurethane elastomer.

EFFECT: high reliability of its operation is achieved in the device, including in ambient conditions with air temperature up to −60 °C.

7 cl, 2 dwg

Description

The invention can be used in the repair of oil product pipelines, oil pipelines, and other pipeline networks and relates to means for stopping the flow from pipes or into pipes by introducing an element expanding in place into the pipe.

Devices for hermetic sealing ("dock seals") are used when cutting and inserting coils on main oil pipelines or oil product pipelines. According to the Guiding document RD-23.040.00-KTN-073-15 (Industry standardization system of JSC "AK Transneft") "Cutting and cutting of coils, fittings, shut-off and control valves. Connecting sections of trunk pipelines. Requirements for the organization and performance of work" ), approved on 05/07/2015 (http://docplayer.ru/51496059-Rukovodyashiy-dokument-rd-ktn.html), a coil is a piece of pipe for welding into a pipeline with a length of at least one diameter from a pipe of the same diameter, wall thickness , strength class as the rest of the pipeline.

In accordance with the specified Guiding document RD-23.040.00-KTN-073-15 (hereinafter the Guiding document) in paragraph 5.1.3 b) the main work on cutting and tapping the coil includes the following actions:

inserting temporary plungers into the pipeline or installing plunger valves;

stopping the pumping of oil / oil product by shutting down the pumping units of oil pumping (oil product pumping) stations and shutting off the work area with linear or technological valves;

exemption from oil / oil product of the pipeline section being repaired;

drilling control holes to control oil / oil product level;

cutting out the section to be replaced (coil) and dismantling the cut coil;

drilling holes for pressure control in the main pipeline; drilling of technological holes for the installation of dock seals;

installation of dock seals;

sealing with sealants of the internal cavity of the pipeline;

drilling holes to control the gas-air environment in the main pipeline;

welding and installation work on inserting a new coil;

welding of control and technological holes; opening of linear valves;

release of the air-gas mixture and filling the main oil pipeline with oil / oil product;

bringing the pipeline to operating mode by switching on the pumping units;

liquidation of temporary plungers and dismantling of plunger valves.

For temporary storage of oil / oil product pumped out of the repaired area for the period of repair work, mobile tanks and open-type collapsible tanks are used (clause 6.4.1 of the Guidance Document).

An injection into the pipeline of temporary plungers or the installation of plungers is performed using a tapping device mounted on a plunger (branch pipe) (section 7.5, paragraph 7.5.5 of the Guidance Document).

After freeing the main pipeline from oil / oil product and cutting the coil, the inner cavity of the main oil pipeline must be sealed before performing the hot and welding and installation works (paragraph 1 of clause 12.1.1 of the Guidance Document).

The internal cavity of the linear part of the pipeline should be closed with Caiman-type dock seals (RF patent # 2240466 for invention "Device for reusable sealing of the internal cavity of the open end of the pipeline", published on November 20, 2004, IPC F16L 55/12), GRK ("rubber cord dock sealer" ), ROM (pneumatic damping device - rubber-cord sheath, see page 14 of the Guidance Document).

Rubber-cord hermetic seals of GRK type are presented in Figure 1 and of the ROM type in Figure 2 and are described in Section 4.1 of the Methodological Instructions for the implementation of practical work 1, 2 in the course "Machines and equipment for the construction and repair of oil and gas facilities" "Study of the structures of sealing devices and their methods reserves ", author Nikulchikov V.K. (published in 2015, Tomsk Polytechnic University Publishing House, information is available on the website portal.tpu.ru> BEZtp> MUGRK) (hereinafter Methodical Instructions).

Hermetic seals GRK, ROM contain a rubber-cord casing with a ribbed sealing belt made on it and with a fitting for connecting a pneumatic line.

The "Cayman" type germtizer, described in the patent of the Russian Federation # 2240466, contains a rubber-cord shell of a toroidal shape, hermetically enclosing a cylindrical body overlapped inside, at each end of which there are two elastic ring-shaped centering supports. On the outer surface of the rubber-cord casing, a ribbed sealing belt is made, and there is an opening for gas supply.

After inserting a new coil and completing repair work, the caiman, GRK, and PZU dock shelters, freed from gas, remain in the pipeline and are transported by the flow of oil or oil products to the chamber for receiving cleaning and diagnostic tools.

During repairs in areas not equipped with such chambers, clay is used to seal the internal cavity of the pipeline (clause 12.1.1 of the Guidance Document).

Installation of caiman, GRK, ROM dock seals in accordance with clause 15.5.1 of the Guidance Document is carried out from the open end of the main pipeline, one dock sealer from each open end (Figure 12.4 of the Guidance Document).

Shutting off the pipeline with clay (clay swabs) is performed from the open end of the pipeline or through branch pipes with valves (clause 12.6 of the Guidance Document).

According to clause 12.1.2 of the Guidelines, sealing of the cavity of the oil product pipeline for pumping aircraft fuel of jet engines of the TS-1, TS-2 grades in order to preserve the operational properties of this fuel should be performed using sealants removed from the pipeline.

In paragraph 6 of clause 12.1.1 of the Guiding document, the OR-1311 sealing device is indicated as a removable shelter specially designed for an oil product pipeline (Fig. 12.7 of the Guiding document).

The OP-1311 sealing device contains a soft inflatable rubber-based shell with a ribbed sealing belt ("sealing chamber" according to clause 12.7.4 of the Guidance Document), at the end of which there are metal blades installed as a collet mechanism ("sealing chamber support" ibid. ) (see also www.techhap.ru/proizvoditel/244604.html). The OP-1311 sealing device is installed through the nozzles pre-welded to the pipeline, equipped with valves, with holes cut in the nozzles for the passage of the OP-1311 sealing device (paragraphs 12.7.1, 12.7.2 of the Guidance Document).

The support of the seal chamber, together with the laid chamber, is introduced through the specified valve into the center of the pipe (paragraph 12.7.6, ibid.), Gas is fed into the chamber (paragraph 12.7.7, ibid.). The camera, expanding, reveals the metal blades on which it rests when the pipeline is shut off. After the completion of the repair work, the chamber of the OP-1311 sealing device is vented and removed together with its support through the branch pipe and the valve, first from one side of the repair site, then from the other (paragraph 12.7.11 of the Guidance Document). According to clause 12.7.7 (ibid.), Nitrogen is supplied to the OP-1311 sealing chamber at a pressure exceeding the pressure in the pipeline by 0.08 MPa (by 0.8 atm). According to clause 12.7.10, in the sealing elements (previously referred to in the Guidance Document as the seal chamber) of the OP-13111 device, a constant differential pressure from the outside of the covered area is maintained by regulating the pressure in the sealing element (seal chamber).

From paragraph 5.2.2.4 of the above Methodological Guidelines, it follows that to control the pressure (vacuum) in the sealed section of the oil pipeline at a distance of at least 0.5 m from the hole to control the oil level in the direction opposite from the section being repaired, a pressure / vacuum control unit is installed ...

When

- oil inflows,

- increasing the gas pressure (up to 0.1 MPa = 1 atm) or

- the formation of a vacuum (up to minus 0.05 MPa = 0.5 atm) in the sealed area,

all work should be suspended, and the working personnel removed from the pit.

When oil enters the cut off section of the pipeline due to valve leaks or other reasons, it is necessary to take measures to pump it out.

With an increase in the pressure of gases or with the formation of a vacuum, the cause of their appearance must be established and eliminated, after which additional holes with a diameter of 12 mm in the required number must be drilled until the effect of pressure and vacuum on the dock is completely eliminated.

From the above, it follows that when using dock shelters such as "Cayman", GRK, PZU, OR-13111 or clay swabs, the pipeline must be freed from the pumped product in the section between linear valves, sometimes tens of kilometers. This is a time-consuming and costly work.

Installation and disassembly of caiman, GRK, ROM, or clay swabs through the open end of the pipeline is unsafe for the personnel performing these works, due to the effect of the vacuum that sometimes occurs in the pipeline. Therefore, when dismantling the GDK, ROM, additional equipment is required in the form of protective grids installed on the open end of the pipeline before starting to bleed gas in the hermetic sealer (paragraph 12.5.9 of the Guidance Document).

Bleed off after repair and transported by the pumping product to the receiving chamber, dock seals such as "Cayman", GRK, PZU, knock down scale, rust, deposits from the walls of the pipeline, can collapse, which leads to clogging of the product pumped through the pipeline. As follows from clause 12.1.2 of the Guiding document, such a clogging of the oil product pipeline for pumping aviation fuel of jet engines of the TS-1, TS-2 brands (light aviation fuel) is especially undesirable.

The indicated dock seals OR-1311, which are removed after repair through the branch pipes (Section 12.7 "Technology of sealing the internal cavity of an oil product pipeline using equipment for repairing pipelines OR-1311" of the Guidelines), do not clog the pipeline.

But according to the Guiding Document, they also require labor-intensive release from the pumped product of a significant section (between linear valves) of the pipeline. In addition, in practice, the OP-1311 sealing devices have shown themselves to be insufficiently reliable, since they did not withstand the pressure arising from the sealed end of the pipeline properly and with due constancy. Removal of this sealing device through the nozzle also caused problems in practice, including due to the metal blades of the bladder support.

The material of the inflatable shells of the caiman, GRK, ROM and the inflatable chamber of the OR-1311 sealing device, made on the basis of rubber, is not frost-resistant and loses its strength and elasticity at low ambient temperatures down to -60 degrees C.

The closest analogue (prototype) is the OP-1311 sealing device.

The objective of the invention is to create a device for hermetically closing the internal cavity of an oil product pipeline or oil pipeline with the possibility of installing and removing this device through a plunger on the pipeline (and not through the open end of the pipeline), which is less dangerous for personnel and does not lead to clogging of the pipeline after its repair, as well as able to work effectively in the Far North.

The technical result consists in increasing the reliability of the sealing device and ensuring its operability at low ambient temperatures down to -60 degrees C.

Like the closest analogue (prototype), the device for sealing the internal cavity of the pipeline contains a closed sealed inflatable shell made with the possibility of installation in the internal cavity of the pipeline, on the outer surface of which there is at least one sealing belt with at least one length by an edge, encircling that part of the shell, which, when inflated, comes into contact with the pipeline wall, while the shell has an opening for gas supply to it.

Unlike the closest analogue (prototype), it additionally contains a second closed hermetically sealed inflatable shell, on the outer surface of which there is at least one sealing belt with at least one rib running along its length, encircling that part of the second shell, which, when inflated, contacts with the pipeline wall, while the second shell has an opening for supplying gas to it, and it is configured to be installed next to the first specified shell in the inner cavity of the pipeline and to form a ring in an inflated form, as well as with the possibility of passing a pneumatic pipeline for supplying gas to the first a shell and tubes for controlling the environment between the shells when they are installed in the pipeline through the hole of this ring to ensure a hermetic adhesion of the second shell in inflated form to the said pneumatic pipeline and the tube, and the said first and second shells are made of a material based on elastic synthetic fabric with breaking load not less than 300 daN / 5 cm in the longitudinal and transverse directions and a tear resistance of not less than 35 daN in the longitudinal direction and 30 daN in the transverse direction, both sides of the specified fabric are coated with thermoplastic polyurethane, and their sealing belts mentioned above are made of polyurethane elastomer.

To facilitate extraction from the pipeline at the inventive device through the hole of the ring of the second annular shell, there is a thrust fixed at one end of the said hole of the ring, the free end of the thrust comes out at the opposite end of the hole of the ring, while the thrust is installed and configured to retract the outer annular surface of the said second shell into the specified hole of its ring when pulling the free end of the thrust, and the specified second shell is made when it is installed in the cavity of the pipeline with the possibility of positioning with respect to the first shell by the side on which the thrust is fixed.

To increase the sealing ability of the inventive device, the ring hole of the said second annular shell from the side, which, when the device is installed in the pipeline, faces the first shell, is hermetically closed by a screen having an opening made with the possibility of a hermetic passage through it of the pneumatic line for supplying gas to the first shell and tubes to control the environment between the shells, while the screen is made of the same material as the said shells.

The mentioned second shell can be made with the possibility of forming a torus-shaped inflated form (as you know, a torus is formed by rotation of a circle around an axis lying in the plane of the circle, but not passing through its center. Moreover, if the axis passes outside the circle, then the torus is called open and is a ring)

In particular cases of using the claimed device, the specified coating can be from 0.1 mm (100 microns) to 1.5 mm (1500 microns) thick, which, based on experimental data, is preferable.

The specified elastic synthetic fabric can be polyester fabric as well as aramid fabric.

A device for tightly closing the internal cavity of the pipeline, shown in figure 1 and 2 with the following designations:

1 - pipeline,

2 - the first closed sealed inflatable shell,

3 - sealing belt of the first shell,

4 - edge of the sealing belt of the first shell,

5 - hole for gas supply to the first shell,

6 - the second closed sealed inflatable shell,

7 - sealing belt of the second shell,

8 - edge of the sealing belt of the second shell,

9 - hole for gas supply to the second shell,

10 - pneumatic pipeline for supplying gas to the first shell,

11 - tube for controlling the environment between the shells when they are installed in the pipeline,

12 - elastic synthetic fabric, which is the basis for the material of both shells,

13 - thermoplastic polyurethane coating,

14 - covering from thermoplastic polyurethane,

15 - hole of the ring of the second annular shell,

16 - thrust,

17 - the place of fastening the thrust,

18 - free end of the rod,

19 - outer annular surface of the second annular shell,

20 - screen,

21 - screen hole,

22 - plunger.

Figure 1 schematically shows the installation of the inventive device in a pipeline.

Figure 2 schematically shows the second annular shell 6, the attachment point 17 of the rod 16 and the location of the rod 16 in the hole 15 of the second annular shell 6, while the arrows indicate the direction of action of the rod 16 for drawing the outer annular surface 19 of the second shell 6 into the hole 15 of its ring.

The device for sealing the inner cavity of the pipeline 1 contains the first closed hermetically sealed inflatable shell 2, made with the possibility of installation in the inner cavity of the pipeline 1.

On the outer surface of the shell 2 there is at least one sealing belt 3 with one or more ribs 4 running along its length, encircling that part of the shell 2, which, when inflated, contacts the wall of the pipeline 1.

In specific versions of the device, the number of ribs on the first shell 2 ranged from 10 to 20, depending on the dimensions of the device.

The first shell 2 has an opening 5 for supplying gas to it.

The inventive device additionally contains a second closed sealed inflatable shell 6, on the outer surface of which there is at least one sealing belt 7 with at least one rib 8 extending along its length, encircling that part of the second shell 6, which, when inflated, comes into contact with the wall of the pipeline 1 In specific versions of the device, the number of ribs on the second shell 6 ranged from 10 to 20, depending on the dimensions of the device. The second shell 6 has an opening 9 for supplying gas to it.

The second shell 6 is made with the possibility of its installation next to the first shell 2 in the inner cavity of the pipeline 1, in particular, due to its dimensions.

Due to the cutting of the material from which it is made, and the corresponding fastening of the cut parts, the second casing 6 takes the form of a ring (in particular, a torus) in the inflated form, through the central opening 15 of which a pneumatic line 10 can be passed to supply gas to the first casing 2 and the tube to control the medium 11 between the shells 2 and 6 when they are installed in the pipeline 1.

In this case, the second casing 6 (more precisely, the walls of the hole 15 of the casing ring 6) in an inflated form adheres tightly to the pneumatic line 10 and the tube 11.

The first shell 2 and the second shell 6 are made of a material based on elastic synthetic fabric 12, which has a breaking load of at least 300 daN / 5 cm in the longitudinal and transverse directions and a tear resistance of at least 35 daN in the longitudinal direction and 30 daN in the transverse direction ... In a preferred embodiment, the synthetic fabric 12 can be an aramid fabric, such as Kevlar, or a polyester fabric, such as lavsan. Both sides of the fabric 12 are coated with a thermoplastic polyurethane 13 and 14. The polyurethane coating 13 and 14 can be applied to the fabric 12 by any known method, for example by casting, molding, spraying. The preferred thickness of the coatings 13 and 14 on each side is between 0.1 mm and 1.5 mm. Within these limits, there is an optimal combination of crumpling of shells 2 and 6, sufficient for their passage through the plunger 22 in a gas-free form, and their strength.

The sealing band 3 of the first shell 2 and the sealing band 7 of the second shell 6 are made of a polyurethane elastomer, both thermoplastic and thermosetting plastic. The sealing bands 3 and 7 are attached to their shells in any known manner, for example by casting or molding.

Due to the material of which the shells 2 and 6 are made, in the form not filled with gas, each of them is a soft, easily wrinkled bag.

Through the hole 15 of the ring of the second annular shell 6 there is a thrust 16, fixed (see position 17 in the figure) at one end of the hole 15.

The free end 18 of the rod 16 extends at the opposite end of the hole 15.

The rod 16 is installed and made with the possibility of retracting the outer annular surface 19 of the second shell 6 into the hole 15 of its ring by pulling the free end of the rod 16.

The rod 16 can be made in the form of a steel cable, chain or power cord made of lavsan, polyester or aramid. In a specific design, the rod 16 is made in the form of a power cord made of lavsan. To fix 17, the ends of the rod 16 are symmetrically brought out with a bend on the outer end surface of the second annular shell 6 and welded to it by high-frequency welding, and on top of them a sealing screen (or washer) 20 is attached to the end of the second annular shell 6. Pulling the free end 18 of the power cord 16, you can pull the shell 6 to the center of the hole 15, and then pull the tightened end of the shell 6 through the hole 15, turning the second shell 6 "inside out". When installing the second shell 6 in the cavity of the pipeline 1, it is positioned in relation to the first shell 2 by the side on which (position 17) the rod 16 is fixed.

For more reliable operation of the inventive device, the hole 15 of the ring of the second annular shell 6 can be closed with a sealing screen 20 on the side of the shell 6, which, when the device is installed in the pipeline 1, faces the first shell 2. The screen 20 has an opening 21. The hole 21 provides a tight passage through it, a pneumatic line 10 for supplying gas to the first shell 2 and a tube 11 to control the medium between the shells 2 and 6 by, for example, gaskets or a sealed adapter. The shield 20 is made of the same material as the shells 2 and 6, that is, a synthetic fabric material with a double-sided TPU coating, the characteristics of which are described above.

The device works as follows. To replace a section of the pipeline (for cutting and inserting a coil), temporary plungers 22 or plungers 22 are installed on it on both sides of the area to be replaced, the pumping of oil / oil product is stopped by shutting off the pumping units of oil pumping (oil product pumping) stations and shutting off a section of the pipeline, on which the site to be replaced (site of work) is located, with linear or technological valves.

Then it is possible to release from oil / oil product a section of the pipeline between the linear (technological) valves or to partially release it, or not to release this section from the pumped product (in particular, to leave the section of the pipeline without complete drainage), if the pumping conditions through this pipeline allow.

Then, shell 2 is placed into pipeline 1 through each temporary plunger (air valve) 22, to which a pneumatic line 10 is connected through hole 5 (fitting) to supply gas to it, and then shell 6, through hole 15 of the ring of which a pneumatic line 10 is passed. shells 2 and 6 supply gas through holes 5 and 9, respectively. Shells 2 and 6 expand. In this case, the internal cavity of the pipeline 1 is sealed due to the tight fit of the sealing belts 3 and 7 with the inner walls of the pipeline 1.

Sealing also takes place between the wall of the hole 15 of the ring of the second shell 6 and the pneumatic line 10 going to the shell 2, as well as the tube 11 for controlling the medium between the shells 2 and 6. Additional sealing between them is provided by the sealing screen 19.

With the help of the tube 11, the flow of oil / oil product, the increase in pressure or the formation of a vacuum are controlled to values higher than the permissible values in the interval between the shells 2 and 6. If oil or oil product enters this interval, they can be pumped out through the tube 11. It is possible to connect pressure control devices, vacuum, explosive gas sensor.

If the section of the pipeline between the linear valves has not been freed from oil / oil product, then the section to be repaired between the two inflated shells 2 and 6 is released from them.

Then the defective coil is cut out and the new coil is inserted into the repaired area. During repair work, to maintain the required gas pressure in the shell 2, it can be pumped through the pneumatic line 10.

After completing the repair work, shells 2 and 6 are freed from gas (vented) and removed through a plunger 22.

To facilitate extraction, you can use the rod 16. Pulling the free end 18 of the rod 16, the outer annular surface 19 of the shell 6 with the sealing belt 7 on it is pulled into the hole 15 of the ring of the second shell 6. The ring-shaped shell 6 is turned inside out. The sealing belt 7 with ribs 8 is inside the ring of the annular shell 6, and the smooth surface that was previously inside the hole 15 turns out to be on the outside, so the removal of the shell 6 from the plunger 22 is simplified.

In addition to being used for cutting and inserting coils, the inventive device can be used for any other purpose of sealing a pipeline, that is, the device is universal and can be used for sealing gas pipelines, sewer pipelines and water pipelines.

Thus, in the inventive device for tightly closing the internal cavity of the pipeline, the reliability of its operation is increased and its operability is ensured at low ambient temperatures down to -60 degrees C due to the fact that an additional second shell is introduced into the design of the device, made in a certain way indicated above, and the material of both shells 2 and 6 is made on the basis of a particularly strong synthetic fabric coated with thermoplastic polyurethane, and in the structure of the device there are no rigid metal parts in comparison with the prototype.

Tests have shown that a set of the first shell 2 and the second annular shell 6 freely passes through a plunger with an outer diameter of up to 108 mm and through a hole cut in it from 80 mm on a pipeline with an outer diameter of up to 273 mm and reliably seals it. Another standard size of this kit, also containing the first casing 2 and the second annular casing 6, freely passes through the plunger with an outer diameter of up to 159 mm and through a hole cut in it from 120 mm on a pipeline with an outer diameter of up to 530 mm and reliably seals it. Such a device, containing shells 2 and 6, which can be easily installed in the pipeline and removed through a plunger on the pipeline (and not through the open end of the pipeline), is less dangerous and less laborious for personnel, and also does not lead to pipeline clogging after repairs. In this case, a complete pumping out of the pipeline section between the linear valves is not required, but only the release from oil / oil product of the repaired section between the two declared devices installed along its edges.

The inventive device is especially useful in the event of a product leakage through closed linear or process valves, when, after the valve has cut off a part of the pipeline, it is not possible to completely eliminate the leak.

Claims (7)

1. A device for sealing the inner cavity of the pipeline, containing a closed hermetic inflatable shell, made with the possibility of installation in the inner cavity of the pipeline, on the outer surface of which there is at least one sealing belt with at least one rib running along its length, encircling that part shell, which, when inflated, contacts the wall of the pipeline, while the shell has an opening for supplying gas to it, characterized in that it additionally contains a second closed hermetically sealed inflatable shell, on the outer surface of which there is at least one sealing belt with at least with one edge running along its length, encircling that part of the second shell, which, when inflated, contacts the pipeline wall, while the second shell has an opening for gas supply to it, and it is configured to be installed next to the first specified shell in the internal cavity of the pipeline andforming a ring in an inflated form, and also with the possibility of passing a pneumatic line for supplying gas to the first shell and tubes for controlling the environment between the shells when they are installed in the pipeline through the hole of this ring, ensuring a hermetic adhesion of the second shell in an inflated form to the said pneumatic line and tube, and said first and second shells are made of a material based on an elastic synthetic fabric with a breaking load of at least 300 daN / 5 cm in the longitudinal and transverse directions and a tear resistance of at least 35 daN in the longitudinal direction and 30 daN in the transverse direction, on both sides of the specified the fabric is coated with thermoplastic polyurethane, and the aforementioned sealing belts are made of polyurethane elastomer. 2. The device according to claim 1, characterized in that a thrust fixed at one end of said hole passes through the hole of the ring of the second annular shell, the free end of the thrust comes out at the opposite end of said hole, while the thrust is installed and configured to retract the outer annular surface the specified second shell into the specified hole of its ring when tensioning the free end of the rod, and the specified second shell is made when installing it in the cavity of the pipeline with the possibility of positioning in relation to the first shell by the side on which the rod is fixed. 3. The device according to claim 1, characterized in that the ring hole of said second annular shell on the side that, when the device is installed in the pipeline, faces the first shell, is hermetically closed by a screen having an opening made with the possibility of passing through it a pneumatic pipeline for supplying gas to the first shell and tubes for controlling the medium between the shells, the screen being made of the same material as the said shells. 4. The device according to claim. 1, characterized in that said second shell is configured to form a toroidal shape when inflated. 5. A device according to claim 1, characterized in that said coating of the material of said shells is made with a thickness of 0.1 mm to 1.5 mm. 6. A device according to claim 1, wherein said elastic synthetic fabric is a polyester fabric. 7. A device according to claim 1, wherein said elastic synthetic fabric is an aramid fabric.

Images