RU2650621C1 - Method of inter-pipe diagnostics performance in a mobile liquid plug - Google Patents

Abstract

FIELD: defectoscopy.

SUBSTANCE: using to detect defects in the pipeline wall. Summary of the invention consists in the fact that equipped with transmitters whose signals are received and processed at ground processing stations the in-line inspection instrument is moved through a pipeline, at that, the in-line inspection instrument (III) is moved through a pipeline in a movable liquid plug, for creation of which a first external separator piston is inserted into the pipeline launch chamber, filling the launch chamber with the movable liquid plug liquid medium and starting the first external separator piston, then the first internal piston separator is inserted into the launch chamber, filling the launch chamber with the movable liquid plug liquid medium and starting the first internal separator piston, then an in-line inspection instrument is inserted into the pipeline launch chamber, launch chamber is filled with the movable liquid plug liquid medium and starting the in-line inspection instrument, after that, a second internal separator piston is inserted into the launch chamber, the launch chamber is filled with the movable liquid plug liquid medium and the second internal separator piston is launched, then a second external separator piston is inserted into the launch chamber and an external separator piston is launched, after which the of movable liquid plug mobile liquid plug is launched through a pipeline, at that, observing the condition of equality of the frictional forces of the support elements of the in-tube inspection device and the friction forces of the support elements of all separator pistons to the inner wall of the pipeline.

EFFECT: broader functional capabilities of all types of IIIs, originally intended for in-line inspection of main pipelines with movement with the flow of pumped liquid product, as well as the use of IIIs that are not intended for operation in a gas environment, for in-line diagnostics of gas mainlines.

21 cl, 3 dwg

Description

The invention relates to the field of non-destructive testing of materials and products and can be used to detect defects in the wall of the pipeline.

The well-known "Combined magnetic-ultrasonic flaw detector for diagnosing the condition of pipelines" (patent RU 132208, IPC G01N 27/82, priority dated 02.16.2012), which is designed for in-line inspection of pipelines, mainly main oil, gas and product pipelines by passing inside a controlled the pipeline device, consisting of one or more transport modules, moving inside the pipeline due to the pressure of the product stream transported through the pipeline. A combined magnetic-ultrasonic flaw detector consists of three sections, one of which contains a set of batteries with a system for connecting and controlling the operation of the entire flaw detector, a marker transceiver with an antenna, sensors of external and internal pressure, temperature, and odometric sensors mounted on spring-loaded levers outside the section housing, the second section contains an ultrasound diagnostic system for wall thickness and an ultrasound system installed in a sealed enclosure диагностики diagnostics of pipeline cracks, including processing and recording of ultrasonic diagnostic information from two groups of ultrasonic sensors installed on the flexible runners installed on the outside of the housing, one of which is made with the possibility of measuring wall thickness and the other with the possibility of detecting cracks, and the third section contains a magnetic diagnostic system with longitudinal magnetization, data processing and recording units.

The well-known "Piston-separator" (patent RU 132743, IPC VVB 9/04, priority dated 02.16.2012), which is designed to remove water from the internal cavity of pipelines under construction or reconstruction using compressed air, separation of various types of crude oil and petroleum products during pumping, release of pipelines from oil and oil products using inert gas. The separator piston has a significant reduction in the wear of the sealing elements, an increase in the passage rate through the pipeline and a reduction in energy costs, as it contains a hollow body, at least one supporting disk and at least one sealing collar, mounted on the front of the case, and at least one sealing cuff mounted on the rear of the housing, while it is equipped with a check valve, which is made in the middle of the housing to adjust the differential pressure.

The well-known "Transmitter of electromagnetic waves for determining the position of in-pipe objects" (patent RU 144066, IPC F17D 5/00, priority of 08/23/2013), which is an auxiliary device for pipeline systems, namely, systems for determining the position of type devices inside pipelines, in-pipe inspection shells, as well as scrapers and separators, moving inside the pipelines of main oil pipelines, gas pipelines and oil product pipelines, by emitting a low-frequency electromagnetic field inside the piping gadfly and registration of the electromagnetic field on the opposite side relative to the wall of the pipeline.

The well-known "Method for identifying potentially dangerous sections of a pipeline with an undesigned level of stress-strain state" (patent RU 2602327, IPC F16L 1/00, priority of 05/08/2015) and "A method for identifying potentially dangerous sections of a pipeline with an undesigned level of stress-strain state" ( patent RU 2603501, IPC F16L 1/00, priority dated 06/25/2015), which consist in the estimated assessment of bending stresses, and this assessment is performed according to the in-line diagnostics, in which during the passage of the in-tube projectile along the routes e measure the radius of elastic bending of the pipeline.

The well-known "Method of moving an in-tube transport projectile in the main pipeline with a given uniform speed and a device for its implementation" (patent RU 2359454, IPC B08V 9/055, priority of 04/07/2008), in which the in-tube transport projectile is moved in the main pipeline with air or gas medium, with a given uniform speed, creating favorable working conditions for the control and diagnostic apparatus, providing monitoring and diagnosis of the state of the main pipeline with high quality by means of accuracy, efficiency and efficiency by supplying energy from the outside, in the form of a medium flow with a given pressure to move the projectile in the pipeline, and converting part of the flow energy into hydraulic and electric to create a controlled braking force of the projectile on the pipeline wall in order to adjust the speed in case of deviation from a given device and for implementing the method, comprising a housing with a sealing cuff of elastomer and a speed matching device, an air source, for example a turbocom spring unit based on an aircraft engine, or a source of natural gas, endowed with the ability to regulate the pressure of the medium supplied to the pipeline, and an in-line transport projectile containing a coupling device, front and rear centering wheels with spring mechanisms and hydraulic presses connected with the muffled beginning of the examined section of the main pipeline to the surface of the main pipeline, and a hydraulic system consisting of a hydraulic tank, hydraulic accumulators, a hydraulic pump with a drive through a chain a transmission from the rear centering wheel, the heat exchanger, the block of electrohydraulic equipment for controlling the hydraulic system, the hydraulic cylinders pressing the speed matching device onto the surface of the pipeline of shoes, and the projectile also contains a microprocessor controlling it through an electrical system consisting of an electric generator with a drive through a chain drive from the rear centering wheel, an electric accumulator, control unit, speed and pressure sensors.

The well-known "Method of moving an in-tube transport projectile in a trunk pipeline with a speed that varies smoothly within predetermined limits and a device for its implementation" (patent RU 2393931, IPC V08V 9/055, priority of 06/19/2009), which provides monitoring and diagnostics of the state of the examined trunk pipeline and consists of supplying an air or gas with a given pressure and flow rate to the projectile from an external source of the working fluid flow, creating a pressure drop on it, moving the projectile by the force created on it pressure hell, speed control by braking during its acceleration by converting the excess part of the flow energy into mechanical energy with its accumulation or into heat with its utilization, and when speed is slowed down by restraining its drop by creating additional moving projectile force on the pipe wall due to the use of the accumulated mechanical energy. The device comprises a unidirectional scraper, consisting of a housing with a sealing sleeve made of elastomer, a speed control device equipped with a brake means, a pneumatic cylinder connected by a pipeline with a source of compressed gas, a source of the working medium or a source of natural gas, endowed with the ability to maintain a constant set pressure and flow rate of the working the medium supplied to the beginning of the muffled from the end of the surveyed section of the main pipeline with an open outlet. An in-tube transport projectile containing a scraper includes a housing with an adapted cuff and coupling devices. The speed control device is equipped as a braking means with rubber wheels in an amount of at least three, pressed against the pipeline surface by a spring mechanism and kinematically connected each through an elastic coupling, an angular conical multiplier and a cardan mechanism with a multi-speed multiplier located in the scraper body and being the drive of two, coaxially also installed in the housing, hollow cylindrical flywheels of multidirectional rotation, having equal kinetic sizes moments.

The well-known "Method of in-line ultrasonic diagnosis of the state of the pipeline" (patent RU 2153163, IPC G01N 29/04, G01N 29/10, priority from 11/29/1999), in which a flaw detector with an electro-acoustic transducer is continuously moved along the wall of the pipeline.

It is known "Device for in-line flaw detection" (patent RU 2599072, IPC F17D 5/00, priority dated 04/15/2015) containing marker pads and a flaw detector equipped with a module for measuring the thickness of the pipeline wall, characterized in that the marker pads are made in the form of curved metal plates, fixed on the surface of the pipeline along its longitudinal axis, with the possibility of fit of their inner surface to the outer surface of the pipeline.

The well-known "In-pipe magnetic flaw detector" (patent RU 2176082, IPC G01N 27/83, priority dated 12/26/2000), which is intended for in-line diagnostics of pipelines transporting natural and industrial gases, oil and oil products.

The well-known "Intra-pipe flaw detector" (patent RU 2225977, IPC G01M 3/08, F17D 5/00, G01N 27/72, priority dated 05/27/2003), which is passed inside a controlled pipeline.

The known technology of in-line diagnostics of main pipelines (comp. Kuznetsov S.N. Diagnostics of pipelines: a training manual. V. Voronezh GASU, 2015 - 78 s), in which each section of the diagnosed main pipeline should be equipped with start-up chambers for in-line devices. To control the movement of the device, transceivers of profilers and flaw detectors, as well as ground tracking devices, which include low-frequency locators and ground marker transmitters, are used. Structurally, the start-up cameras are identical.

Remizov A.G. (“Diagnostics of gas pipelines made of polymer composite materials. Current trends in the development of the gas industry in Russia. Materials of the correspondence scientific-practical conference of young scientists and specialists, Volgograd, October 22, 2015 / 2015. - 161 s) states that the use of in-pipe diagnostics of gas pipelines of a flaw detector passing in a liquid plug is economically unprofitable due to losses associated with the decommissioning of a section of a gas pipeline for a long period of time for drying after an in-line diagnostics Ostik.

There is a method of so-called dry ultrasound, in which electromagnetic acoustic transducers (hereinafter - EMAT) are used (patents RU 2451867, IPC F16L 55/26, F16L 101/30, priority from 06/17/2010; RU 2413128, IPC F17D 5/06, priority of 08/21/2009; RU 2485388, IPC F16L 55/26, F17D 5/06, priority of 11/05/2008; RU 166262, IPC G01N 29/04, priority of 11/27/2015; RU 36485, IPC F17D 5/00, priority of 11/21/2003) for in-pipe inspection of pipelines using an in-pipe projectile. The essence of EMAT is that in a substance that does not have either piezoelectric or magnetic strictive properties, ultrasonic waves are excited under the influence of an electromagnetic wave (Kaganov M.I., Vasiliev A.N. Electromagnetic-acoustic transducers are the result of the action of surface force. Advances in Physical Sciences (Volume 163, No. 10 October 1993). The method of in-line diagnostics using EMAT has a significant drawback - it requires energy consumption significantly greater than immersion ultrasonic and magnetic methods. Energy saving is one of the main requirements for in-tube devices for conducting in-line diagnostics of long-distance trunk pipelines, since autonomous power supplies are used on in-tube inspection devices. In addition, the method of in-line diagnostics using EMAT requires the removal of the pumped liquid product from the diagnosed section of the pipeline.

Of the known technical solutions, the closest to the proposed method is a method of in-line diagnostics by means of a device for non-destructive testing of pipelines (patent RU 12734, IPC G01N 29/00, priority from 10.28.1999), which is passed inside the diagnosed pipeline, while the device for non-destructive testing is provided sensors whose signals are processed at ground processing points. The disadvantage of this method is the limitation of industrial applicability, since the described device is intended only for in-line diagnostics by ultrasonic and electromagnetic-acoustic methods.

The claimed method, in comparison with the methods of in-line diagnostics known from the prior art, is characterized by a significant distinguishing feature: this method allows the use of all types of in-line inspection devices (hereinafter VIP), which were originally intended for in-line diagnostics of main pipelines with movement together with the flow, for in-line diagnostics of main gas pipelines pumped liquid product. This method also makes it possible to diagnose the internal surface of the pipeline after completion of construction and installation works during construction, as well as technical re-equipment, reconstruction, overhaul, before putting the pipeline section into operation.

The technical result of the proposed method for conducting in-line diagnostics in a movable fluid plug is:

- expanding the functionality of all types of VIPs, originally designed for in-line diagnostics of trunk pipelines with movement along with the flow of the pumped liquid product;

- the use of VIPs, not intended for operation in a gas environment, for in-line diagnostics of gas pipelines, as well as for diagnosing the internal surface of a pipeline after completion of construction and installation works during construction, as well as technical re-equipment, reconstruction, overhaul, before putting the pipeline section into operation .

The technical result is achieved by the fact that in the method of conducting in-line diagnostics the in-tube inspection device is moved through the pipeline, while the in-tube inspection device is equipped with transmitters, signals from which are received and processed at ground processing points, and the in-tube inspection device is moved through the pipe in a movable liquid tube, for the creation of which the first external piston-separator is stored in the start-up chamber of the pipeline, the start-up chamber is filled with liquid medium of the movable liquid tube and start the first external piston-separator, then store the first internal piston-separator in the start chamber, fill the start chamber with the fluid of the movable liquid tube and start the first internal piston-separator, then store the in-tube inspection device into the start-up chamber of the pipeline , the start-up chamber is filled with the liquid medium of the moving liquid tube and the in-tube inspection device is started, then stored in the kama start the second internal piston-separator, the start-up chamber is filled with the liquid medium of the movable liquid plug and the second internal piston-separator is started, then the second external piston-separator is stored in the start-up chamber and the external piston-separator is started, after which the movable liquid plug is movable liquid plugs are launched through the pipeline, while observing the condition of equality of the friction forces of the supporting elements of the in-pipe inspection device and the friction forces of the supporting elements of all cakes-separators on the inner wall of the pipeline.

In addition, the specified technical result is achieved in special cases of implementation due to the fact that:

when creating a movable fluid plug, the in-tube inspection device is located at a distance of two kilometers to three kilometers from the first and second internal piston separators;

the first external piston-separator and the second external piston-separator are located at a distance of two kilometers to three kilometers, respectively, from the first internal piston-separator and the second internal piston-separator;

additionally use from one to three pairs of external piston separators;

all separator pistons are identical in design;

all separator pistons are equipped with transmitters, signals from which are received and processed at ground processing points;

after starting the movable fluid plug, its passage through the pipeline is controlled by processing signals from the transmitters of the in-tube inspection device and piston separators;

ground processing points are mobile or stationary;

the start-up of a mobile fluid plug can be carried out using oil or oil product;

the start of the movable fluid plug can be carried out using compressed air or gas;

oil may be used as the fluid medium of the moving fluid plug;

liquid petroleum products may be used as the fluid medium of the mobile fluid plug;

a mixture of glycerol and water can be used as the fluid medium of a mobile fluid plug;

water may be used as the fluid medium of the movable fluid plug;

all piston separators and the in-line inspection device are equipped with cuffs of the same material and with the same degree of wear;

each piston-separator is equipped with a check valve made with the possibility of opening at a pressure of a liquid medium in the starting chamber OD kg / cm ² ;

as an in-line inspection device, an ultrasonic in-line flaw detector can be used;

as an in-line inspection device, a magnetic in-line flaw detector can be used;

as an in-tube inspection device, a combined magnetic-ultrasonic in-tube flaw detector can be used;

as an in-line inspection device, a multi-channel profiler can be used;

as an in-line inspection device, an in-line inspection device can be used to determine the position of the pipeline.

The inventive method allows for in-line diagnostics of main oil pipelines, oil products pipelines, gas pipelines, as well as diagnostics of the inner surface of the pipeline after completion of construction and installation works during construction, technical re-equipment, reconstruction, overhaul, before putting the pipeline section into operation. This method allows for in-line diagnostics for all types of pipelines with in-line inspection devices, originally designed for in-line diagnostics of main pipelines with movement along with the flow of the pumped liquid product.

The most relevant of the claimed method in the diagnosis of VIP pipelines, not adapted to work in a gas environment. Moreover, the cost of work in this way is an order of magnitude lower than the development, production or acquisition of a new VIP with technical characteristics that correspond to the conditions of in-line diagnostics in a gas environment.

The use of the proposed method is also economically advantageous by the time criterion, since the work related to the preparation and conduct of in-line diagnostics in a moving liquid plug of a gas main is lower than the development and production of an in-line diagnostic device adapted to work in a gas environment, provided that the enterprise has a sufficient number of VIPs working in a fluid stream.

The invention is illustrated by the following drawings:

in FIG. 1 shows a diagram of a movable fluid plug using four piston separators;

in FIG. 2 shows a piston separator;

in FIG. 3 shows a check valve and a movable piston-splitter assembly.

In FIG. 1-3 the following notation is used:

1. first internal piston-separator

2. second internal piston-separator

3. the first external piston-separator

4. second external piston-separator

5. in-line inspection device

6. liquid medium of a mobile liquid tube

7. pipeline

8. cuff of the piston separator

9. check valve piston separator

10. The movable assembly of the piston separator.

The method of conducting in-line diagnostics in a movable fluid plug is as follows. A liquid plug is created in the pipeline 7 (Fig. 1), for this, the first external piston-separator 3 is stored in the start-up chamber (not shown) of the pipeline 7, the start-up chamber is filled with the fluid medium 6 of the movable liquid plug and the first external piston-separator 3 is started. Moreover, at the initial moment, when the first external piston-separator 3 is launched into the pipeline at a pressure in the start-up chamber of 0.1 kg / cm ² , its check valve 9 opens, thereby first two cuffs 8 of the first external piston-separator are immediately activated I 3 (Fig. 2, 3). In this case, the check valve 9 (Fig. 3) helps to stabilize the fluid pressure and prevents the deformation of the cuffs 8. Next, the first external piston-separator 3 is advanced at a distance equal to the length of the movable fluid plug. The passage through the pipeline 7 of the first external piston-separator 3 from the start chamber is controlled at ground processing points by processing signals received from transmitters installed in the first external piston-separator 3.

After the first external piston-separator 3 passes the marker point from the start-up chamber, the pumping of the liquid medium 6 of the movable liquid tube through the pipe 7 is stopped and the first internal piston-separator 1 is stored in the start chamber. The start chamber is filled with the liquid medium 6 of the movable liquid tube and the first internal piston is started the piston-separator 1, while the distance between the first external piston-separator 3 and the first internal piston-separator 1 should be from two to three kilometers. Moreover, at the initial moment, when the first internal piston-separator 1 is launched into the pipeline at a pressure in the starting chamber of 0.1 kg / cm ² , its check valve 9 opens and the first two cuffs 8 are turned on. In this case, the check valve 9 of the first internal piston-separator 1 helps to stabilize the fluid pressure and prevents the cuffs from being deformed 8. The passage through the pipeline 7 of the first internal piston-separator 1 from the start chamber is monitored at ground processing points by processing signals received from the transmitter tors established in the first inner piston-separator 1.

After the first marker piston 1 passes through the marker point from the start-up chamber, the pumping of the liquid medium 6 of the movable liquid tube through the pipe 7 is stopped and the in-tube inspection device (VIP) 5 is stored in the start chamber, the start chamber is filled with the liquid medium 6 of the movable liquid tube and the VIP starts 5, observing the distance from 2 km to 3 km from the first internal piston-separator 1. The passage of the VIP 5 through the pipeline 7 from the launch chamber is controlled at ground processing points by processing of signals received from transmitters installed in VIP 5.

Then, after the VIP point 5 passes the marker point from the start chamber, the pumping of the liquid medium 6 of the movable liquid tube through the pipe 7 is stopped and the second internal piston-separator 2 is stored in the start chamber, the start chamber is filled with the liquid medium 6 of the movable liquid tube and the second internal piston-separator is started 2, while the distance between the second internal piston-separator 2 and VIP 5 should be from 2 km to 3 km. Moreover, at the initial moment, when the second internal piston-separator 2 is launched into the pipeline at a pressure in the starting chamber of 0.1 kg / cm ² , its non-return valve 9 opens, thereby immediately including the first two cuffs 8 of the second internal piston-separator 2, At the same time, its check valve 9 helps to stabilize the liquid pressure and prevents the cuffs from being deformed 8. The passage through the pipeline 7 of the second internal piston-separator 2 from the start chamber is controlled at ground processing points by processing signals, established by proxy in the second inner piston-separator 2 transmitters.

Then, after passing the marker point 2 from the start chamber by the second internal piston-separator 2, the pumping of the liquid medium 6 of the movable fluid plug through the pipe 7 is stopped and the second external piston-separator 4 is stored in the start chamber. For example, the start chamber is filled with ordinary oil or oil and start second outer piston separator 4. Moreover, at the initial moment when running in the second outer conduit of the piston separator 4 under a pressure chamber in the starting 0.1 kg / cm ² opens its inverse stem An 9, thereby immediately starting to work the first two cuffs 8 of the second external piston-separator 4. In this case, the check valve 9 of the second external piston-separator 4 helps to stabilize the fluid pressure and prevents deformation of the cuffs 8. In addition, the distance between the second external piston is the separator 4 and the second internal piston-separator 2 should be from two to three kilometers. The passage through the pipe 7 of the second external piston-separator 4 from the start chamber is controlled at ground processing points by processing signals received from transmitters installed in the second external piston-separator 4.

In general, the control of the passage of a movable fluid plug through a pipeline is carried out at ground processing points, which can be either stationary or mobile, for example, escort teams.

The launch of a movable fluid plug is made with oil or oil product, if the oil or oil product pipeline is diagnosed; compressed air or gas, if a gas pipeline is diagnosed, while oil, liquid petroleum products, a mixture of glycerin and water, or water can be used as the fluid medium of the moving fluid plug.

The main condition for the implementation of the method for conducting in-line diagnostics in a moving fluid plug without fluid leakage outside the fluid plug is that the friction forces of the supporting elements of the in-line inspection device are equal to the friction forces of the supporting elements of all piston separators against the inner wall of the pipeline.

At the end of the passage of the movable fluid plug after the first external piston-separator 3 enters the receiving chamber of the pipeline 7 (not shown), the oil pumping is stopped for 15 minutes through the pipeline 7 and the first external piston-separator 3 is removed from the receiving chamber. After removing the first external piston-separator 3 prepare the receiving chamber for receiving the first internal piston-separator 1 and resume pumping oil through the pipeline. Similarly, the first internal piston-separator 1, VIP 5, the second internal piston-separator 2 and the second external piston-separator 4 are alternately removed.

To create a movable fluid plug for in-line pipe diagnostics, one to three pairs of external piston separators located on each side of the movable fluid plug can be additionally used. At the same time, the distance between all external piston separators, including additional ones, should be from two to three kilometers.

In addition, to prevent overflow of the fluid from the movable fluid plug, all the piston separators that make up the movable fluid plug and the in-line inspection device are equipped with cuffs of the same material and with the same degree of wear. Moreover, all the piston-separators have an identical design (Fig. 2), which provides at least four cuffs 8 located in the front and rear parts of the piston-separator housing, one of the cuffs 8 being located on the movable assembly of the piston-separator housing ( Fig. 3). Also in the manufacture of piston separators use materials that are safe against the formation of sparks from frictional friction, impact and electrostatic discharges.

When conducting in-line diagnostics in a moving fluid plug, in-line inspection devices of any type and design can be used, for example, an ultrasonic in-line flaw detector, a magnetic in-line flaw detector, a combined magnetic-ultrasonic in-line flaw detector, a multi-channel profilometer, or an in-line inspection device for determining the position of the pipeline.

Claims (21)

1. The method of conducting in-line diagnostics, in which the in-line inspection device is moved through the pipeline, while the in-line inspection device is equipped with transmitters, the signals from which are received and processed at ground processing points, characterized in that the in-line inspection device is moved through the pipeline in a movable liquid tube, to create which the first external piston-separator is stored in the start-up chamber of the pipeline, the start-up chamber is filled with liquid medium of the plug and start the first external piston-separator, then store the first internal piston-separator in the start chamber, fill the start chamber with the fluid of the movable liquid tube and start the first internal piston-separator, then store the in-tube inspection device into the start-up chamber, the start-up chamber is filled with the liquid medium of the movable liquid tube and the in-tube inspection device is started, after which the second the morning piston-separator, the start-up chamber is filled with the liquid medium of the movable liquid tube and the second internal piston-separator is started, then the second external piston-separator is stored in the start chamber and the external piston-separator is started, after which the movable liquid tube of the movable liquid tube is started through the pipeline, while observing the condition of equality of the friction forces of the supporting elements of the in-pipe inspection device and the friction forces of the supporting elements of all the pistons, divide her about the inner wall of the conduit. 2. The method according to p. 1, characterized in that when creating a movable fluid tube, the in-tube inspection device is located at a distance of two kilometers to three kilometers from the first and second internal piston separators. 3. The method according to p. 1, characterized in that the first external piston-separator and the second external piston-separator are located at a distance of two kilometers to three kilometers, respectively, from the first internal piston-separator and the second internal piston-separator. 4. The method according to p. 1, characterized in that it additionally use from one to three pairs of external piston separators. 5. The method according to p. 1, characterized in that all the piston separators have an identical design. 6. The method according to p. 1, characterized in that all the piston separators are equipped with transmitters, the signals from which are received and processed at ground processing points. 7. The method according to p. 1, characterized in that after starting the movable fluid plug, its passage through the pipeline is controlled by processing signals from the transmitters of the in-tube inspection device and piston separators. 8. The method according to p. 1, characterized in that the ground processing points are mobile or stationary. 9. The method according to p. 1, characterized in that the launch of a movable fluid plug is performed using oil or oil product. 10. The method according to p. 1, characterized in that the launch of a movable fluid plug is performed using compressed air or gas. 11. The method according to p. 1, characterized in that as the liquid medium of the movable liquid tube using oil. 12. The method according to p. 1, characterized in that as the liquid medium of the moving liquid tube using liquid petroleum products. 13. The method according to p. 1, characterized in that the mixture of glycerol and water is used as the fluid medium of the movable fluid plug. 14. The method according to p. 1, characterized in that as the liquid medium of the movable liquid tube using water. 15. The method according to p. 1, characterized in that all the piston separators and the in-line inspection device are equipped with cuffs of the same material and the same degree of wear. 16. The method according to p. 1, characterized in that each piston-separator is equipped with a check valve made with the possibility of opening at a pressure of a liquid medium in the starting chamber of 0.1 kg / cm ² . 17. The method according to p. 1, characterized in that as an in-line inspection device using an ultrasonic in-line flaw detector. 18. The method according to p. 1, characterized in that as the in-line inspection device using a magnetic in-line flaw detector. 19. The method according to p. 1, characterized in that as the in-line inspection device using a combined magnetic-ultrasonic in-line flaw detector. 20. The method according to p. 1, characterized in that as a pipe inspection device using a multi-channel profiler. 21. The method according to p. 1, characterized in that as an in-line inspection device, an in-line inspection device is used to determine the position of the pipeline.

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