The method of labeling a radioactive tracer substance of defects in the wall of the pipeline in-line machine for marking defects in the wall of the pipeline and the injection module

 

(57) Abstract:

The invention relates to maintenance of gas pipelines. The invention is aimed at improving the safety of personnel when working with gaseous radioactive tracer substance, as well as to create injection module using the Autonomous functioning of the energy resources of the transported medium. For this purpose, gaseous radioactive tracer substance is transported along the pipeline in tanks at a pressure below the pressure of gas transportation. Just before introducing it into the process compartment in a container of gaseous radioactive indicator material is fed gas from the processing section, mix it in a container with gaseous radioactive tracer substance and equalize the pressure in the vessel and the processing section, and then Inuktitut the mixture from the container in the process compartment. The system of marking gas radioactive tracer substance in the technical compartment is equipped with remote-controlled mixing and injection modules, each of which includes mixing the working chamber of variable volume filled with indicator supplied with gas from the working chamber into the process compartment. The injection module is equipped with a remotely controlled device for locking the piston in the starting position, and its charge-transfer device has a second cylindrical locking body interacting with a drainage pipe. In the walls of the filling-dispensing cap and drainage pipe made channels. The piston is made with two-way rod, the ends of which are located first and second locking bodies, separating in the starting position of the working piston and the drive chamber from the environment. 3 S. and 9 C. p. F.-ly, 6 ill.

The invention relates to maintenance of gas pipelines of large diameter and may find application in systems in-line diagnostics of trunk gas pipelines in operation with the use of radiotracers.

There is a method of marking a radioactive tracer substance defects in the wall of the pipeline, including the formation of the pipeline adjacent to the wall of the processing section, filling the cavity of the specified compartment technological environment, introduction to the technological environment of a radioactive tracer substance and movement processing section Ehkologicheski compartment with a branded environment is separated from the main cavity of the pipeline two spaced apart along its length tubes. In practice, the length of the processing section can reach 1800 m (1 mile).

A significant disadvantage of this method is its high environmental hazard, especially in the inspection of large diameter pipes, as in this case the volume of the cavity of the technical compartment will exceed 10003. Accordingly marked increase technological environment.

Closest to the claimed method of labeling a radioactive tracer substance defects in the wall of the pipeline and implements this method in-line apparatus is the invention described in the patent of the Russian Federation 2148807 C1, G 01 M 3/22, 10.05.2000. There is a method of marking a radioactive tracer substance defects in the wall of the pipeline includes forming in the pipeline adjacent to the wall of the processing section, filling the cavity of the specified compartment technological environment, which used to be transported by pipeline gas introduction to the technological environment of gaseous radioactive tracer substances from containers until the desired concentration of the indicator substance in the breadboard is asnam radioactive tracer substance controlled along the pipeline and periodic recharge during the whole time of the inspection of the pipeline processing section by the introduction of discrete portions of gaseous radioactive tracer substances. In the known method the indicator substance is stored in tanks at a pressure equal to or greater than the pressure of the gas transportation, which simplifies the introduction of the indicator substance in the process compartment. Known in-line machine for marking defects in the wall of the pipeline contains an annular bearing flow-through housing with open ends, attached to the outer surface of the annular housing sealing elements forming the outer ring of technological compartment filled transported by pipeline gas, and the marking system of the gas in the processing section, including capacity constant volume with gaseous radioactive tracer substance with remotely controlled valves. Under the existing pressure gas transportation pipelines (5-10 MPa) experiencing technological difficulties gear tanks of gaseous radioactive tracer substance, as it requires specialized equipment to increase its pressure before filling the containers, and means for decontamination. In addition, we assume the conditions of safety volume one refuel gas radioacti revised 2 cm3and this miniaturization capacity and, accordingly, a remotely controlled valve it causes additional problems with the release of "dead" zones tanks, valves, and channels from the remaining gaseous radioactive tracer substances.

Closest to the claimed injection module is the device described in the author's certificate of the USSR 1536079 A1, F 15 B 1/04, 15.01.1990. The known device can be used as the injection module. It includes a housing with a cylindrical cavity and two covers, one of which is made from gas-distributing neck, and another cover feature introduced into the cylindrical cavity drainage pipe, and has a charge-transfer device, comprising a cylindrical locking body interacting with a petrol-transfer-mouth. In the cylindrical cavity is placed a spring-loaded displacing the piston dividing the specified cavity at the working chamber of variable volume filled with the injected substance, and the drive chamber in which is placed a compression spring. The drive chamber is sealed. In the known device the injected substance is stored in the working chamber at a pressure of RA is the gadfly pressure reaches 5-10 MPa and the use of the known device for the storage and supply of technological compartment gaseous radioactive tracer substances will lead to conservation of the indicator substance in "dead" zones, that will cause problems with the maintenance of the injection module and in-line unit after inspection. Under the existing pressure transport gas to displace gaseous radioactive tracer substances from the working chamber into the process compartment will need a powerful compression spring, is able to overcome the pressure of gas transportation. In addition, the control device by the well known injection module includes a remotely operated valve, which requires the presence of a pressure differential in the body, and when using this injection module comprising a pig for marking defects in the wall of the pipeline radioactive tracer substance, it is necessary to enter in the composition of the projectile additional systems to create and maintain a specified pressure drop.

Task to be solved by the present invention is directed is to provide a method for labeling radioactive tracer substance of defects in the wall of the pipeline in-line machine for marking defects in the wall of the pipeline and injection module for it, providing increased and routine maintenance, associated with the preparation of an in-line apparatus for inspection of the main pipeline and the service it after inspection. An additional object of the invention is the creation of injection module that will operate independently, using energy resources transported medium.

The technical problem is solved in that in the method of labeling a radioactive tracer substance defects in the wall of the pipeline, including the formation of the pipeline adjacent to the wall of the processing section, filling the cavity of the specified compartment technological environment, which used to be transported by pipeline gas introduction to the technological environment of gaseous radioactive tracer substances from containers until the desired concentration of the indicator substance in the technical compartment, the movement processing section marked with the process medium and containers with gaseous radioactive tracer substance controlled along the pipeline and periodic recharge during the whole time of the inspection of the pipeline processing section by the introduction of discretion indicator substance is transported along the pipeline in tanks at a pressure below the pressure of the gas transportation, just before introducing it into the process compartment in a container of gaseous radioactive indicator material is fed gas from the processing section, mix it in a container with gaseous radioactive tracer substance and equalize the pressure in the vessel and the processing section, and then Inuktitut the mixture from the container in the process compartment.

With respect to in-line machine for marking defects in the wall of the main pipeline, the technical problem is solved by the fact that in-line apparatus containing the annular bearing flow-through housing with open ends, attached to the outer surface of the annular housing sealing elements forming the outer ring of technological compartment filled transported by pipeline gas, and the marking system of gas in the technical compartment gaseous radioactive tracer substance, according to the invention the marking system of gas in the technical compartment gaseous radioactive tracer substance is equipped with remote-controlled mixing and injection modules, each of which comprises mixing the working chamber peremennog the ACI mixture of indicator substances transported gas from the specified working chamber in the process compartment.

In addition, mixing and injection modules are connected with the formation of a candy bar.

The marking system of gas in the technical compartment can be equipped with two monoblocks mixing and injection modules, placed in the outer annular compartment diametrically opposed relative to each other.

While mixing and injection modules can be located in the monoblock linearly or in two lines with opposite arrangement of the modules of one line relative to other line modules.

Each monoblock mixing and injection modules, it is advisable to place in protective lead container, and the annular bearing flow case to equip two frames for mounting monoblocks together with protective containers.

The apparatus may have placed in the outer ring of technological compartment and sealed relative to his chambers for accessories, which have the shape of cylindrical segments and positioned between mono mixing and injection modules.

The apparatus has a device for connecting it to a pipe transporting means.

Premenitions cavity and two lids one of which is made from gas-distributing neck, and another cover feature introduced into the cylindrical cavity drainage pipe placed in the cylindrical cavity spring displacing the piston dividing the specified cavity at the working chamber of variable volume filled with the injected substance, and the drive chamber in which is placed a compression spring, and a charge-transfer device that includes a first cylindrical locking body interacting with a petrol-transfer-mouth, according to the invention equipped with a remotely controlled device for locking the piston in the starting position, and its charge-transfer device has a second cylindrical locking body, interacting with a drainage pipe in the walls of the filling-dispensing cap and drainage pipe made channels, the piston is made with two-way rod, the ends of which are located first and second locking bodies, separating in the starting position of the working piston and the drive chamber from the environment, the distance between the cutting edge of the first locking member and the channels in the wall of the filling-dispensing cap is larger than the distance between odeceixe module completed secondary camera, hosts remotely controlled device for locking the piston in a starting position with an electric drive and the associated stopper, the plunger is made with a circular groove, and the wall separating the secondary camera from the cylindrical cavity is a through hole, and the stopper skipped through the hole and put in the groove of the piston.

When this plunger is advisable to make a skirt, the length of which is greater than the length of the stroke of the piston.

The essence of the invention lies in the fact that the implementation of the proposed method staff works with gaseous radioactive tracer substance of low pressure without the use of increasing the pressure of the specialized equipment at a relatively low volume concentration of the indicator substance. All operations for pressure equalization of the indicator substance and the gas in the processing section performed immediately before its introduction in the specified slot. Equalization of pressure in the vessel and the technical compartment by mixing the indicator substance with a gas from the processing section stores the original bulk concentration of the indicator substance is niiccee indicator substances in the process compartment remaining in "dead" zones of injection module indicator gas has a volume concentration, comparable with its concentration when charging capacity, which increases the safety of personnel in repairs with in-line apparatus after inspection of pipeline.

The presence of a marking system of gas in the technical compartment in-line apparatus remotely controlled mixing and injection modules, each of which comprises mixing the working chamber of variable volume filled with gaseous radioactive tracer substance, and a displacement device for force feeding a mixture of indicator substances transported with the gas from the working chamber into the process compartment, allows for the marking of gas in the technical compartment at any pressure transport gas, as the pressure during filling of the working chamber gaseous radioactive tracer substance can be arbitrarily low and is determined by the conditions of safe operation with gaseous radioactive substances. Remote controlled mixing and injection module is filled with an indicator substance of the working chamber can be powered at any time you connect your camera to the cavity of the processing section, and the differential pressure between the process chamber and the mixing of the working chamber ensures reliable mixing environment in the mixing tube. The resulting mixture of gaseous radioactive tracer substances transported by pipeline gas has a pressure equal to the pressure of the gas transportation that allows you to inject it using a displacement device in the process compartment with a minimum expenditure of energy.

Because each remote controlled mixing and injection module is a stand-alone node, the in-line apparatus for marking wall of the pipeline include these modules can be designed for the longest time inspection, and at least the duration of the inspection work in-line apparatus is adjustable by simply changing the number of modules filled with gaseous radioactive tracer substance.

The formation of the mixing and injection modules monoblock simplifies maintenance of these modules and reduces the charging time of containers and fastening injection modules on the in-line apparatus, which reduces the contact time staff with radio compartment two monoblocks mixing and injection modules by placing them in the outer annular compartment diametrically opposed relative to each other increases its technological capabilities and helps reduce the load on the chassis in-line apparatus.

Conclusion each monoblock mixing and injection modules in a protective lead container increases radiation safety when servicing an in-line apparatus and equipment carrying the annular flow-through housing two frames for mounting monoblocks together with protective containers allows you to quickly install and remove the units and reduce the contact time of personnel to radioactive radiation indicator substance.

Equipment in-line apparatus is placed in the outer annular compartment and sealed relative to his chambers for accessories, which have the shape of cylindrical segments and positioned between mono mixing and injection modules, reduces the amount of technological compartment and reduces the radiation load on the environment when inspecting a pipeline.

The design of the injection module allows the filling of the working chamber through the handout neck and channels in the wall of gaseous radioactive tracer substance (or any other toxic gas) pressure, ensuring safe operation with radioact pressure, what is achieved in a consistent pressure change in the working and the drive chambers of the injection module when it is charging and working. This is ensured by the simultaneous movement of the displacing piston with double-sided stem and secured to the ends of the first and second cylindrical valve bodies and agree on their relative position to the channels in the walls of the filling-dispensing cap and drainage pipe. When filling of the working chamber gaseous radioactive tracer substance is fed into it through the channels in the wall of the filling and distributing the neckline. In the process of charging, exposing the filling device on the end of the stem, filling the neck, move the displacing piston, increasing the volume of the working chamber and compressing the spring in the drive chamber. Drive Luggage at this time drained into the external environment through the channels in the wall of the drain pipe, which reduces the force that must be applied to a displacement of the piston during the filling of the working chamber. When selected mutual arrangement of the first and second locking bodies relative to the channels in the walls of the filling-dispensing neck and the drainage pipe when filling the first overlapping channels in a gas-teenanalvideo the camera. Displacing the piston is moved to lock him into the starting position. The characteristics of the compression spring and the diameters of the first and second cylindrical locking bodies are selected so that when working stroke of the displacing piston initial effort was sufficient to overcome the counter-movement displacement of the piston due to the pressure in the chamber relative to the drive chamber and providing sufficient effort at the end of the stroke displacement of the piston. The presence of a remotely controlled device for locking the piston in the starting position ensures stable state filled injection module in the starting position before it was put into effect. Actuation of the remotely controlled device leads to the release of the displacing piston and the displacement under the action of the spring compression. The displacement of the piston causes the opening of channels in the drainage pipe and the external environment of high pressure gas from the processing section, enters the drive chamber, which accelerates the movement of the piston and causes the message to the working chamber through the handout neck and channels in its wall with technological compartment. Gas from technologicalindustrial substance with the equalization of pressure in the working chamber and the processing section, while the working chamber simultaneously performs the function of a mixer. Injection of the mixture from the mixing of the working chamber in the process compartment occurs by the movement of the displacing piston under the influence of compression springs and there is no need to enter into the in-line apparatus.

Equipment remotely controlled device for locking the piston in the starting position of the actuator and the associated stopper and execution of the piston ring groove that communicates with the stopper, allows you to form a compact injection module, and performing a displacement of the piston skirt, the length of which is greater than the length of the stroke of the piston increases the reliability of the injection module, as it ensures that the stopper will interact with the piston only when the piston into the starting position.

In Fig.1 depicts an in-line device that implements the proposed method, a General view of Fig.2 - section a-a in Fig.1; Fig.3 - view of B in Fig.2; Fig. 4-6 - mixing-injection module with three positions, a displacement of the piston.

The invention is implemented as follows.

The inspected pipeline 1 is laid under secretrary apparatus 4 for marking defects of the pipe wall. In-line apparatus comprises a cylindrical germanacos 5 with the control devices, the annular bearing running casing 6 with open ends, which is fixed to the supporting device 7, the retaining device on the axis of the pipe, and the sealing elements in the form of an elastic cuffs 8, overlying the gap between the casing 6 and the wall 2 of the pipeline with the formation of the outer ring in the processing section 9. Supporting device 7 is made in the form of an elastic cuffs that provide tractive effort to move the unit inside a pipeline. In-line apparatus provided with a device 10 for connecting it to a pipe transporting means or other modules of the projectile-detector.

In-line apparatus 4 has a system of marking of gas in the technical compartment gaseous radioactive tracer substance, which includes a remote-controlled mixing and injection modules 11, United in two monoblock 12. Monoblocks 12 housed in a technical compartment 9 is diametrically opposed relative to each other. Each monoblock is placed in a protective lead container 13. When servicing the units can be transferred compatible with the 6. In the monoblock modules 11 are arranged in two lines, with a horizontal arrangement of the modules of one line relative to other line modules, as shown in Fig.3. It is also possible arrangement of the modules in the candy bar in one line.

Between 12 monoblocks are camera 15 for accessories, which have the shape of cylindrical segments. The camera 15 is hermetically separated from the processing section 9, which excludes the impact of marked radioactive tracer gas environment located in their equipment. Chamber 15 is reduced passive volume processing section and thereby reduce the volume of the marked technological environment.

Each mixing and injection module 11 (Fig.4) includes a housing 16 with a cylindrical cavity and two covers 17 and 18. Cover 17 has a filling and distributing the neck 19 with an axial hole 20 and the cover 18 to the drain pipe 21 with a through hole 22.

In the cylindrical cavity of the housing 16 posted by spring displacing the piston 23 with a two-way valve 24. The piston divides the body cavity at the working chamber 25 of variable volume and pressure chamber 26 in which is placed the spring 27 is compressed. The working chamber is at the same time with etousa injection of the mixture into the process compartment 9. At the ends of the rod 24 is placed first cylindrical locking body 28 that is located in the hole 20 filling-transfer cap 19, and a second cylindrical stop valve 29 located in the hole 22 of the drain pipe 21, forming a charge-transfer device mixing and injection module. The diameter of the hole 22 and overlying its cylindrical valve body 29 is somewhat larger than the diameter of the hole 20 and overlying its cylindrical valve body 28. This provides a force sufficient to overcome the counter-movement of the displacing piston-side working chamber during the stroke displacement of the piston.

In the wall of the filling-transfer cap 19 provided with channels 30 and 31, and in the wall of the drain pipe 21 - channels 32, overlapped locking bodies 28 and 29 when the piston 23.

In the housing 16 of the injection module is made secondary camera 33 which is placed in the actuator 34 and the associated stopper 35 remotely controlled device for fixing the piston 23 in the starting position. The piston has a circular groove 36, and the wall separating the chamber 33 of the cylindrical cavity is a through hole 37. Article is shown in Fig.4. The piston has a skirt 38 which length is greater than its stroke.

In the starting position of the piston 23, the distance L1 between the cutting edge of the first locking member 28 and the channel 31 in the wall of the filling-transfer cap 19 is larger than the distance L2 between the cutting edge of the second valve body 29 and the channel 32 in the wall of the drain pipe 21. When this shut-off bodies 28 and 29 separate working 25 and motor 26 of the camera from the environment.

Preparation of an in-line apparatus 4 for marking defects of the wall 2 of the main pipeline begins with the charging of the mixing and injection module 11 of gaseous radioactive tracer substance. The piston 23 is in the extreme position shown in Fig.6. To a gas-distributing the neck 19 of the plug in the charger and start the flow of gaseous radioactive tracer substances into the working chamber 25. Pressure and filling volume are selected from the conditions of safe operation with gaseous radioactive substances specified in the relevant instructions, and slightly higher than atmospheric. Under the action of excess pressure piston 23 begins to move, compressing the spring 27. The drive chamber 26 soobschaetsa locking bodies 28 and 29 and at the end of charging of the first stop valve 28 closes the channel 31, cutting off the working chamber 25 from the charger. Acting on the end face of the rod 24 from the side of the charger, continue to move the piston. The second stop valve 29 closes the channel 32, cutting off the drive chamber 26 from the external environment, and further movement of the piston is sealed when working 25 and drive 26 cameras. The piston reaches its starting position, the annular groove 36 is opposite the stopper 35 and the piston is fixed in this position. Low pressure in the working 25 and drive 26 cells remains to bring the mixing and injection module in action.

Refill mixing and injection modules 11 can be made directly on the device 4. There may be other charging procedure, when the protective lead container 13 with the monoblock 12 mixing and injection module is removed from the apparatus, dressed in a separate box and installed on the apparatus in a filled condition.

In-line apparatus 4 with seasoned mixing and injection modules 11 is introduced into the inspected pipeline 1 by any known method. Transported by pipeline gas, for example, under pressure of 8.5 MPa, fills the annular proto the t command to the actuator 34. The actuator 34 moves the stopper 35 and outputs it from engagement with the annular groove 36 of the piston 23. Under the action of the spring 27 and the difference of the forces acting on the ends of the rod 24, the piston 23 begins to move, compressing gaseous radioactive substance in the working chamber 25. When the displacement of the first piston opens the channel 32 and the transported gas under high pressure begins to flow into the injection pump chamber 26, which leads to faster movement of the piston. The first locking body 28 pass through the channel 31 and informs the working chamber 25 with the cavity in the processing section 9. Transportable gas under high pressure is directed into the working chamber and mixed therein with gaseous radioactive tracer substance. The pressure in the working chamber 25 and in the technical compartment 9 is aligned and under the action of the spring 27 a mixture of gas transported and the indicator substance is squeezed out in the process compartment. The number of leveraged mixing-injection modules is determined by the volume of the processing section and a specified level of activity the marked environment in the processing section.

In-line apparatus 4 is moved along the inspected pipeline 1 and by decreasing the level AK is Finance regular mixing and injection module 11. The work of this module is the same as that described above. Thus, to maintain the activity the marked environment in the technical compartment does not require any additional systems or devices. If necessary unspent mixing and injection modules can be freed from gaseous radioactive tracer substances according to the procedure similar to that described above.

The labelled medium remaining in the processing section, can be dropped into the pipeline by any known method with dilute it to safe concentrations.

For carrying out the proposed method of labeling radioactive tracer substance defects in the wall of the pipeline, you can use radioactive isotopes of noble gases krypton-85 and xenon-133, which is formed in large quantities by nuclear power plants.

We offer in-line machine for marking defects in the wall of the pipeline and mixing and injection module can be manufactured at machine-building plants using known materials that are compatible with the conveyed medium and widely used estom defects in the wall of the pipeline including the formation of the pipeline adjacent to the wall of the processing section, filling the cavity of the specified compartment technological environment, which used to be transported by pipeline gas introduction to the technological environment of gaseous radioactive tracer substances from containers until the desired concentration of the indicator substance in the technical compartment, the movement processing section marked with the technological environment and the capacities of the indicator substance controlled along the pipeline and periodic recharge during the whole time of the inspection of the pipeline processing section by the introduction of discrete portions of gaseous radioactive tracer substances, characterized in that that gaseous radioactive tracer substance is transported along the pipeline in tanks at a pressure below the pressure of the gas immediately before introduction into the process compartment in a container of gaseous radioactive indicator material is fed gas from the processing section, mix it in a container with gaseous radioactive tracer substance and equalize the pressure in the vessel and 2. In-line machine for marking defects in the wall of the pipeline containing the annular bearing flow-through housing with open ends, attached to the outer surface of the annular housing sealing elements forming the outer ring of technological compartment filled transported by pipeline gas, and the marking system of gas in the technical compartment gaseous radioactive tracer substance, characterized in that the marking system of gas in the technical compartment gaseous radioactive tracer substance is equipped with remote-controlled mixing and injection modules, each of which comprises mixing the working chamber of variable volume filled with indicator radioactive substance, and displacing device for force feeding a mixture of indicator substances transported gas from the specified working chamber in the process compartment.

3. The apparatus according to p. 2, characterized in that the mixing and injection modules are connected with the formation of a candy bar.

4. The apparatus according to p. 3, characterized in that the marking system of gas in the technical compartment is equipped with two monoblocks see the sustained fashion to each other.

5. The device under item 3 or 4, characterized in that the mixing and injection modules are located in monoblock linearly.

6. The device under item 3 or 4, characterized in that the mixing and injection modules are located in the candybar in two lines with opposite arrangement of the modules of one line relative to other line modules.

7. Apparatus according to any one of paragraphs.3 to 6, characterized in that each monoblock mixing and injection modules placed in protective lead container, and the annular bearing running case has two frames for mounting monoblocks together with protective containers.

8. The apparatus according to p. 7, characterized in that it has placed in the outer ring of technological compartment and sealed relative to his chambers for accessories, which have the shape of cylindrical segments and positioned between mono mixing and injection modules.

9. The apparatus according to p. 2, characterized in that it is provided with a device for connecting it to a pipe transporting means.

10. Injection module, comprising a housing with a cylindrical cavity and two covers, one of which is made of a filling-rezday in the cylindrical cavity spring displacing the piston, divides the specified cavity at the working chamber of variable volume filled with the injected substance, and the drive chamber in which is placed a compression spring, and a charge-transfer device that includes a first cylindrical locking body interacting with a petrol-handout neck, characterized in that it is equipped with a remotely controlled device for locking the piston in the starting position, and its charge-transfer device has a second cylindrical locking body interacting with a drainage pipe in the walls of the filling-dispensing cap and drainage pipe made channels, the piston is made with double-sided stem at the ends of which are located first and second locking bodies, separating in the starting position of the working piston and the drive chamber from the environment, the distance between the cutting edge of the first locking member and the channels in the wall of the filling-dispensing cap is larger than the distance between the cutting edge of the second locking member and the channels in the wall of the drain pipe.

11. Module p. 10, characterized in that the module housing is made secondary camera, which is placed remotely operated what'or, the piston is made with a circular groove, and the wall separating the secondary camera from the cylindrical cavity is a through hole, and the stopper skipped through the hole and put in the groove of the piston.

12. The module on p. 11, characterized in that the piston is made with a skirt, the length of which is greater than the length of the stroke of the piston.

 

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