System and method for sealing a pipe.

Abstract

Pipeline (20) sealing system (10) comprising a transport subsystem (11) and a sealing device (12), configured to move inside the pipe (20), the pipe (20) being potentially complex, and possibly including bends, the system (10) further being configured to alternately and reversibly switch from a transport configuration to a release configuration (CLS) of the system in which the sealing device (12) is detached from the transport subsystem (11), the system (10) further comprising a mobility subset (14, 14', 14'') configured to be mounted on the transport subsystem (11) and on the sealing device (12) supported on at least two support points distributed over a section of an inner wall of the pipe (20) while simultaneously ensuring longitudinal mobility of the system (10);the sealing device (12) being configured to transition from a sealing configuration (COB) to an opening configuration (COU) in which the sealing subassembly (15) does not ensure a watertight sealing of the pipe (20); the sealing device (12) further comprising a mechanical retaining subassembly (16) for the sealing device (12) bearing against the inner wall of the pipe (20). Figure 1;

Description

Title of the invention: System and method for sealing a pipe.

[0001] The present invention relates to the field of devices and methods for sealing and / or inerting a pipeline.

[0002] It is known to use a system comprising a transport trolley configured to be mobile inside a pipeline and to transport at least one sealing device configured to be deposited by the transport trolley at a point in the pipeline and to seal the pipeline by means of an inflatable bladder.

[0003] The drawback of known systems is that they are not capable of navigating a bend in a pipeline, and the sealing device risks becoming detached from its mounting point if the bladder accidentally deflates. These drawbacks are particularly significant for implementing such systems in the complex pipeline circuits of a nuclear power plant. Furthermore, known systems are not designed to be mobile within a pipeline that is not substantially horizontal, especially within a pipeline that is nearly vertical or contains bends. Indeed, the transport trolley of known systems is usually designed to rest, under its own weight, on the bottom of the pipeline within which it moves, or to move only in straight sections of piping.

[0004] The invention therefore aims to provide a solution to all or part of these problems.

[0005] To this end, the present invention relates to a pipeline sealing system comprising a transport subsystem and a sealing device, the transport subsystem being motorized, configured to move inside the pipeline in the direction of a longitudinal extension of the pipeline, the system being further configured to switch alternately and reversibly from a transport configuration of the system in which the sealing device is connected to the transport subsystem by a flexible linking component, to a release configuration of the system in which the sealing device is detached from the transport subsystem,the system further comprising at least one mobility sub-assembly configured to be mounted on the transport sub-system and on the sealing device and deployed transversely to the longitudinal extension of the pipeline such that the at least one mobility sub-assembly is supported on at least two support points distributed over a section of an inner wall of the pipeline when deployed, of so that the system is mechanically recalled, transversely to the longitudinal extension of the pipeline, towards a central area of ​​the pipeline section, while simultaneously ensuring longitudinal mobility of the system in the direction of the longitudinal extension of the pipeline; the sealing device comprising a sealing sub-assembly configured to transition from a sealing configuration in which the sealing sub-assembly provides a tight seal of the pipe at a point of sealing the pipe, the seal being tight against a fluid flowing in the pipe at the point of sealing the pipe, to an open configuration in which the sealing sub-assembly does not provide a tight seal of the pipe; the sealing device further comprising a holding sub-assembly configured to transition from a mechanical holding configuration in which the holding sub-assembly provides mechanical holding of the sealing device against the inner wall of the pipe, to a free configuration in which the sealing device is not held by the holding sub-assembly.

[0006] According to one embodiment, the sealing point is a position, on an axis along the longitudinal extension of the pipeline, of a central point of a cross-section relative to the axis, the sealing being ensured over the entire said section centered on said central point.

[0007] According to one embodiment, the fluid is at least one of a gas, a liquid, or even a dust aerosol.

[0008] According to these provisions, the sealing system is capable, thanks to the flexibility of the linking components between the components of the system, and the distribution of the support and rolling points inside the pipeline, of moving inside a pipeline even if the pipeline has bends and even if some portions of the pipeline are not horizontal; the system is also capable, thanks to the mechanical support sub-assembly, of placing the sealing device at a sealing point, without the sealing device risking detachment if the sealing sub-assembly were to fail.

[0009] According to one embodiment, the invention comprises one or more of the following features, alone or in a technically acceptable combination.

[0010] According to one embodiment, when the system is in transport configuration, and the sealing sub-assembly is in opening configuration, and the holding sub-assembly is in free configuration, the system is configured to transport the sealing device from one point to another point in the pipeline, in both directions of the longitudinal extension direction of the pipeline.

[0011] According to one embodiment, when the shutter subassembly is in the open configuration, and the holding subassembly is in the configuration mechanically restrained, the system in transport configuration is configured to transport the sealing device from one point to another point in the pipeline, in only one direction of the longitudinal extension direction of the pipeline, movement in the other direction being made impossible by the mechanical restraining sub-assembly; a transition from a system release configuration to a system transport configuration is thus facilitated, by allowing the transport sub-system of the system in release configuration to take support from the sealing device to move the system into transport configuration, and simultaneously preventing the sealing device from detaching from the pipeline wall in a direction opposite to the transport sub-system during the transition of the system from the release configuration to the transport configuration.

[0012] According to one embodiment, the retaining sub-assembly can take the mechanical retaining configuration when the sealing sub-assembly is in the sealing configuration or when the sealing sub-assembly is in the opening configuration, to prevent the sealing device from detaching from the pipe wall in the latter case.

[0013] According to one embodiment, the transport subsystem comprises one or more motorized elementary modules for propelling or pulling the closing device and, where applicable, other non-motorized elementary modules of the transport subsystem.

[0014] According to one embodiment, the transport subsystem comprises an elementary module connected by the flexible linking component to the sealing device, or comprises an elementary module connected by the flexible linking component to the sealing device and connected by another flexible linking component to at least one other elementary module, the at least one other elementary module and the elementary module and the sealing device each being circumscribed within a virtual geometric envelope having a transverse dimension measured in a plane transverse to the longitudinal extension of the system, and a longitudinal dimension measured along a longitudinal extension of the system, the longitudinal dimension being determined as a function of the transverse dimension, and at least one dimension of a pipe bend to allow the system in transport configuration to cross the pipe bend.

[0015] According to one embodiment, the transverse dimension is a diameter of a section of the cylindrical envelope, and the longitudinal dimension is a length of the cylindrical envelope.

[0016] According to one embodiment, at least one dimension of a pipe bend is a radius of curvature of a central axis of the pipe and an inside diameter of a section of the pipe.

[0017] According to one embodiment, the function is written L=Sin(Arcos((D+RC-Dint / 2) / (RC+Dint / 2)))*2*(RC+Dint / 2), where RC is the radius of curvature, D the transverse dimension, and Dint the inner diameter.

[0018] According to these provisions, the sealing system in transport configuration is capable of transporting a sealing device by moving inside a pipeline comprising one or more bends whose radius of curvature is greater than or equal to the radius of curvature and whose internal diameter is greater than or equal to the internal diameter.

[0019] According to one embodiment, each support point of at least two support points of at least one mobility subset includes a wheel bearing against the inner wall of the pipeline.

[0020] According to one embodiment, the at least two support points of the at least one mobility subset comprise three support points distributed over the section of the pipeline, with an angular sector of approximately 120 degrees between two successive support points of the section.

[0021] According to one embodiment, at least one mobility subset comprises several mobility subsets offset from one another in the direction of the longitudinal extension of the system, and distributed respectively on the transport subsystem and on the sealing device.

[0022] According to one embodiment, a terminal portion of the linking component is equipped with a mobility sub-assembly. According to these provisions, when the system is in the release configuration, the linking component is held in the desired direction to facilitate the transition of the system from the release configuration to the transport configuration.

[0023] According to one embodiment, the plurality of mobility subsets comprises at least two mobility subsets distributed over the transport subsystem and at least two other mobility subsets distributed over the closing device; according to these arrangements the mobility of the different devices of the system is ensured with better mechanical stability.

[0024] According to one embodiment, the sealing device is equipped with a single mobility sub-assembly; these arrangements are sufficient to ensure a minimum mechanical stability of the sealing device, on the one hand in the transport configuration of the system thanks to the mobility sub-assemblies distributed on the other devices of the system to which the sealing device is connected, on the other hand in the release configuration of the system thanks to the holding sub-assembly of the sealing device in mechanical holding configuration which cooperates with the mobility sub-assembly of the sealing device to ensure the stability of the sealing device in the release configuration of the system.

[0025] According to one embodiment, the at least one mobility subset further comprises at least one elastic return mechanism, for example a spring, associated with the wheel configured to keep the wheel in contact with the point on the inner wall of the pipe.

[0026] According to one embodiment, the sealing sub-assembly comprises an inflatable component disposed around the sealing device, transverse to the longitudinal extension of the system and the pipeline, the inflatable component being deflated in the open configuration of the sealing sub-assembly, the inflatable component being further configured to ensure, in the inflated state, in the sealing configuration of the sealing sub-assembly, a first watertight contact with the inner wall of the pipeline at the point of sealing and a second watertight contact with the sealing device, so that in the inflated state of the inflatable component, the pipeline is hermetically sealed by the sealing device.

[0027] According to one embodiment, the inflatable component is an elastic membrane.

[0028] According to one embodiment, the holding subset comprises at least two support components configured to be deployed in the mechanical support configuration, at least two support components being deployed transversely to the longitudinal extension of the pipeline to be supported on different points of a section of the inner wall of the pipeline.

[0029] According to these provisions, when the inflatable component of the sealing device is accidentally deflated after being inflated in the sealing configuration of the sealing subassembly, the sealing device remains mechanically held by the holding subassembly.

[0030] According to one embodiment, the at least two retaining components are retracted with a single-acting cylinder, and deployed with a spring.

[0031] According to one embodiment the cylinder is pneumatic.

[0032] According to one embodiment, the at least two retaining components comprise a unidirectional rolling component, the unidirectional rolling component being configured to ensure mobility in only one direction of the longitudinal extension direction of the pipeline, the mobility being locked in the other direction.

[0033] According to one embodiment, the only direction of mobility is oriented from the closing device towards the transport subsystem.

[0034] According to these provisions, the sealing device is not likely to detach from the wall in the direction opposite to the direction of arrival of the transport subsystem, when the transport subsystem approaches the sealing device to embark and retrieve it in the system's transport configuration.

[0035] According to these provisions also, in the event of a leak in the air circuit of the cylinders configured to allow the subassembly to switch to the free configuration In the holding position, the shuttering device can be pulled towards the exit even when the holding subassembly is locked in the holding configuration.

[0036] According to one embodiment, the linking component includes a terminal part configured to cooperate with a complementary element of the sealing device.

[0037] According to one embodiment, the terminal part includes a camera configured to observe through the shutter device via a transparent wall when the terminal part cooperates with the complementary member of the shutter device to connect the shutter device to the transport subsystem.

[0038] According to one embodiment, the elementary module is an inerting device, the inerting device comprising a sealing subset of the inerting device and an inerting subset, the sealing subset of the inerting device being configured to switch, when the system is in system release configuration, from an opening configuration to a sealing configuration in which the sealing subset of the inerting device ensures a tight sealing of the pipeline at another sealing point of the pipeline, the inerting subset being configured to inject an inert gas into the portion of the pipeline between the sealing point and the other sealing point.

[0039] According to these provisions, the sealed zone of the pipeline created between the two sealing points is inertized by the mixing of the inert gas with the gas previously existing in this same zone.

[0040] According to one embodiment, the inerting subassembly includes a purge, the purge being opened to purge some of the gas existing in the portion of the pipeline between the sealing point and the other sealing point before the injection of the inert gas.

[0041] According to one embodiment, the inert gas is denser than the existing gas, and the sealing device includes another purge, the purge of the inerting device being closed and the other purge being open to purge some of the existing gas in the portion of the pipeline between the sealing point and the other sealing point before the injection of the inert gas, an altitude of the purge of the inerting device being lower than an altitude of the other purge, or conversely, the purge of the inerting device being open and the other purge of the sealing device being closed to purge some of the existing gas in the portion of the pipeline between the sealing point and the other sealing point before the injection of the inert gas, an altitude of the purge of the inerting device being higher than an altitude of the other purge.

[0042] According to one embodiment, the inerting sub-assembly includes lighting and a camera allowing visual inspection of the portion of the pipeline.

[0043] According to one embodiment, the inerting sub-assembly includes an oxygenometer for validating the oxygen level in the portion of the pipeline.

[0044] According to one embodiment, the linking component is configured to allow passage from the transport subsystem to the sealing device of an inflation circuit of the inflatable component of the sealing subassembly of the sealing device and / or of an activation circuit of a pneumatic cylinder of at least two holding components of the sealing device and / or of an electrical supply circuit of the sealing device.

[0045] According to one embodiment, the inflation circuit of the inflatable component of the sealing device and the activation circuit of a pneumatic cylinder of at least two holding components of the sealing device are coupled so that the retraction of the pneumatic cylinder of at least two holding components activates a deflation of the inflatable component.

[0046] The invention also relates to a method of sealing and / or inerting a pipeline in a nuclear power plant comprising the use of a system according to one of the preceding claims.

[0047] For the sake of clarity, an embodiment and / or implementation of the invention is described with reference to the accompanying drawings, which represent, by way of non-limiting example, an embodiment or implementation of a device and / or method according to the invention. The same reference numerals in the drawings designate similar elements or elements with similar functions.

[0048] [Fig.1] is an overview of a sealing and / or inerting system comprising a sealing device and a motorized transport subsystem comprising a complementary sealing and inerting device, according to an embodiment of the invention.

[0049] [Fig.2] is a close-up and separate view of the inerting device and the sealing device of the system shown in [Fig.1], according to one embodiment of the invention.

[0050] [Fig.3] is a perspective view of the sealing device with its sealing sub-assembly in the open configuration, i.e. with the inflatable component deflated, and with its retaining sub-assembly in the free configuration, i.e. with the retaining components retracted, according to an embodiment of the invention

[0051] [Fig.4] is a perspective view of the sealing device with its sealing sub-assembly in the sealing configuration, i.e. with the inflatable component inflated, and with the retaining sub-assembly in the mechanical retaining configuration, i.e. with the retaining components deployed, according to one embodiment of the invention

[0052] [Fig. 5] is another perspective view of the sealing device with its sealing subassembly in the open configuration, i.e., with the inflatable component deflated, and with the retaining subassembly in the free configuration, i.e., with the retaining components retracted, according to one embodiment of the invention; this other view also shows the complementary member of the sealing device configured to receive a terminal part of the flexible linking component of the motorized transport subsystem not shown in this figure

[0053] [Fig.6] is a schematic representation of an implementation of a sealing and inerting system according to an example embodiment in the transport configuration of the system on Figure 6a, and in the release configuration of the system on Figure 6b.

[0054] [Fig.7] a schematic representation of a pipe bend, with the dimensional characteristics of the elementary modules, and of the sealing device of the sealing and inerting system according to an example of an embodiment, so that each elementary module, and the sealing device are each circumscribed, without the mobility subsets, within a virtual geometric envelope.

[0055] [Fig.8] is a perspective view of the sealing device with its sealing sub-assembly in the open configuration, i.e. with the inflatable component deflated, and with its retaining sub-assembly in the free configuration, i.e. retracted, according to another embodiment of the invention, in which the retaining component includes a unidirectional rolling component.

[0056] The present invention relates to a sealing system 10 which allows a pipe to be sealed autonomously. The pipe may have several bends and vertical and horizontal sections.

[0057] The sealing system 10 comprises a transport subsystem 11 and a sealing device 12, shown for example in Figures 1 and 2.

[0058] The sealing device 12 is configured to be coupled to the transport subsystem 11, which allows circulation in a complex piping system that may include: - several bends of up to 90°, the latter being able to be mounted in series, - vertical and horizontal potions, in the direction of ascent and descent,

[0059] The sealing device 12, once deposited by the transport subsystem 11, allows: - using an inflatable component 15, for example an inflatable membrane 15, to isolate a portion of the piping while ensuring airtightness, dust and liquid splash resistance; - using mechanical retaining components 16, for example clamps, and the inflatable membrane 15, to absorb additional axial forces of several kilograms, which ensures that it will remain at the sealing point PO in the piping, without risk of drifting.

[0060] This sealing device 12 can cover a wide range of pipes, thanks to different models of different diameters: - 8 inch model: specially adapted for 8” pipes”, for circulation and deployment in internal diameters between 170 mm and 190 mm. - 10 to 16 inch model: the membrane support and membrane are adapted to the internal diameters considered. For example, the 10” model allows circulation and deployment in internal diameters between 200mm and 232mm.

[0061] The present invention therefore relates firstly to a sealing system 10 of a pipeline 20, the sealing system 10 comprising a transport subsystem 11 and a sealing device 12; the transport subsystem 11 is motorized and configured to move inside the pipeline 20 in the direction of a longitudinal extension of the pipeline 20, the system 10 being further configured to switch alternately and reversibly from a CTS transport configuration of the system 10, schematically illustrated in Figure 6a of [Fig.6], in which the sealing device 12 is connected to the transport subsystem 11 by a flexible linking component 17, to a CLS release configuration of the system 10 in which the sealing device 12 is detached from the transport subsystem 11, schematically illustrated in Figure 6b of [Fig.6].

[0062] As shown in Figures 1, 6a, and 6b, the transport subsystem 11 may include several devices, or elementary modules, connected to each other in pairs by a flexible linking component 17, 17', in particular several motorized modules which can add their motor power to move the sealing device 12; the transport subsystem 11 may also include, as will be described later, an inerting device 13, which also moves with the transport subsystem 11.

[0063] According to one embodiment, the transport subsystem 11 comprises an elementary module 13 connected by the flexible link component 17 to the shutter device 12; or, according to another embodiment, the transport subsystem 11 comprises an elementary module 13 connected by the flexible link component 17 to the shutter device 12, the elementary module 13 also being connected by another flexible link component 17' to at least one other module elementary 13', 13”, at least one other elementary module 13', 13” which may comprise a series of several elementary modules 13', 13” connected to each other in pairs by other flexible linking components 17', 17” so as to form a train of other elementary modules 13”, 13' with a lead elementary module 13' connected to the elementary module 13 by another flexible linking component 17'.

[0064] According to one embodiment, at least one of the elementary modules 13, 13', 13" is motorized so as to propel and / or pull the other elementary modules and the shutter device 12.

[0065] For example, the linking component 17 includes an end portion 18 configured to cooperate with a complementary element 19 of the shutter device 12, as illustrated in [Fig. 2] and in Figure 6a. In particular, the end portion 18 may include a camera configured to observe through the shutter device 12 via a transparent wall when the end portion 18 cooperates with the complementary element 19 of the shutter device 12, as schematically illustrated in Figure 6a, to connect the shutter device 12 to the transport subsystem 11.

[0066] The sealing system 10 further comprises at least one mobility sub-assembly 14, 14', 14"; said mobility sub-assembly 14, 14', 14" is supported on at least two support points, for example three support points, distributed over a section of an inner wall of the pipe 20, so that the system 10 is mechanically recalled, transversely to the longitudinal extension of the pipe 20, towards a central area of ​​the section of the pipe 20, while simultaneously ensuring longitudinal mobility of the system 10 in the direction of the longitudinal extension of the pipe 20.For example, to ensure better stability in support of the support points of each mobility subset 14, 14', 14" the mobility subset 14, 14', 14" comprises, for example, three support points distributed over the section of the pipe 20, with an angular sector of approximately 120 degrees between two successive support points of the mobility subset 14, 14', 14". In particular, each support point of the mobility subset 14, 14', 14" comprises a wheel bearing on the inner wall of the pipe 20, with the axis of rotation of the wheel being directed in a plane transverse to the direction of movement of the system 10 along the longitudinal extension of the pipe 20.

[0067] According to one embodiment, the wheel and the fulcrum of the mobility subassembly 14, 14', 14" includes an elastic return mechanism, for example a spring, associated with the wheel configured to keep the wheel in contact with the point of the section of the inner wall of the pipe 20, as can be seen in [Fig.3].

[0068] According to one embodiment, the shuttering system 10 comprises several mobility sub-assemblies 14, 14', 14" offset from one another in the direction of the longitudinal extension of the system 10, and distributed respectively on the transport sub-system 11, and on the shuttering device 12. In particular, the mobility sub-assemblies 14, 14', 14" are distributed along the transport sub-system 11, on the different devices or modules that constitute the transport sub-system 11. Thus, the mobility of the different sub-systems, devices, components or modules 11, 12, 17 of the system 10 is ensured with good mechanical stability. In particular, according to one example embodiment, the linking component 17 is equipped with a mobility sub-assembly 14', mounted for example on an end part 18 of the linking component 17 (this example embodiment is shown in Figures 2, 6, 6a, and 6b).Thus, when the system 10 is in CLS release configuration, the linking component 17 is held in the desired direction to facilitate the transition of the system 10 from the CLS release configuration, in which the linking component 17 of the transport subsystem 11 is free, as illustrated in Figure 6b, to the CTS transport configuration in which the linking component 17 joins the shuttering device 12 to hook the shuttering device 12 to the transport subsystem 11, as illustrated in Figure 6a.

[0069] On [Fig.1], the mobility sub-assemblies 14, 14' are distributed on the shuttering system 10 with in particular two mobility sub-assemblies 14 and 14' distributed on the shuttering device 12; according to another embodiment, shown in Figures 2, 6a and 6b, the shuttering device 12 can be equipped with a single mobility sub-assembly 14;Indeed, a minimum mechanical stability of the shutter device 12 is thus ensured, on the one hand in the transport configuration of the CTS system thanks to the mobility sub-assemblies 14, 14', 14" distributed over the other devices, components, or modules of the transport sub-system 11 to which the shutter device 12 is connected, on the other hand in the release configuration of the CLS system thanks to the retention sub-assembly 16 of the shutter device 12 in the mechanical retention configuration CMM which will be described later, and which cooperates with the mobility sub-assembly 14 of the shutter device 12 to ensure the stability of the shutter device 12 in the release configuration of the CLS system.

[0070] The sealing device 12 includes a sealing subassembly 15, for example an inflatable component 15, for example an inflatable elastic membrane 15, configured to transition from a COB sealing configuration in which the sealing subassembly 15 provides a watertight seal of the pipe 20 at a sealing point PO of the pipe 20, the seal being watertight against a fluid flowing in the pipe at the sealing point PO of the pipe 20, to an opening configuration COU in which the sealing sub-assembly 15 does not ensure a watertight seal of the pipe 20. The term "sealing point" PO here simply designates a position along an axis of the pipe 20 of a central point PO of a cross-section relative to the axis of the pipe, the seal being ensured over the entire said cross-section centered on said central point PO. The fluid against which the seal is ensured may be, for example, a gas, a liquid, or even a dust aerosol.

[0071] The inflatable component 15 is for example arranged around the sealing device 12, transverse to the longitudinal extension of the system 10 and the pipe 20, the inflatable component 15 being deflated in the opening configuration COU of the sealing sub-assembly 15, the inflatable component 15 being further configured to ensure, in the inflated state, in the sealing configuration COB of the sealing sub-assembly 15, a first watertight contact with the inner wall of the pipe at the sealing point PO and a second watertight contact with the sealing device 12, so that in the inflated state of the inflatable component 15, the pipe is hermetically sealed by the sealing device 12.

[0072] The sealing device 12 further includes a holding sub-assembly 16 configured to move from a mechanical CMM holding configuration in which the holding sub-assembly 16 provides mechanical holding of the sealing device 12 in contact with the inner wall of the pipe 20, to a free CLM configuration in which the sealing device 12 is not held by the holding sub-assembly 16.

[0073] The retaining subassembly 16 includes, for example, at least two retaining components 16, sometimes called clamps 16, configured to be deployed in the mechanical retaining configuration CMM, the retaining components being deployed transversely to the longitudinal extension of the pipe 20 to bear on different points of a section of the inner wall of the pipe 20, as illustrated in [Fig.4], or in Figure 6b.

[0074] Thus, when the inflatable component 15 of the sealing device 12 is deflated, accidentally for example, after having been inflated in the COB sealing configuration of the sealing subassembly 15, the sealing device remains mechanically held against the wall of the pipe 20 by the holding subassembly 16 deployed in the CMM mechanical holding configuration.

[0075] According to one embodiment, at least two retaining components 16 are retracted with a single-acting cylinder and extended with a spring. In other words, the spring presses on the retaining component 16 to deploy it into the mechanically retained configuration, and the cylinder retracts the retaining component 16 to return it to its free configuration.

[0076] According to one embodiment the cylinder is pneumatic.

[0077] According to an exemplary embodiment, illustrated in [Fig. 8], the retaining components 16 each comprise a unidirectional rolling component 21, the unidirectional rolling component 21 being configured to ensure mobility in only one direction of the longitudinal extension of the pipeline 20, mobility being locked in the other direction. For this purpose, the unidirectional rolling component 21 may comprise a polyurethane wheel providing good grip, the rim of which is formed by a unidirectional bearing. Advantageously, the only direction of mobility is oriented from the sealing device 12 towards the transport subsystem 11.Thus, the sealing device 12 is not at risk of detaching from the wall in the opposite direction to the arrival direction of the transport subsystem 11, when the transport subsystem 11 approaches the sealing device 12 to load and retrieve it in the CTS transport configuration of the system 10. Also, in the event of a leak in the air circuit of the cylinders configured to allow the passage to the CLM free configuration of the holding subassembly 16, the sealing device 12 can be pulled towards the exit even when the holding subassembly 16 is blocked in the CLM holding configuration.

[0078] According to a particular embodiment, the dimensions of the shuttering system 10 are defined on the basis of a virtual geometric envelope defined to virtually enclose each elementary module 13, 13', 13" and the shuttering device 12 composing the system 10 in the transport configuration of the CTS system, without taking into account the mobility subsets 14, 14', 14" that may be mounted on the different elementary modules 13, 13', 13" and the shuttering device 12 of the system 10. Said virtual geometric envelope has, for each elementary module, a transverse dimension D, D', for example a diameter D, D', measured in a plane transverse to the longitudinal extension of the system 10, and a longitudinal dimension L, L' measured along a longitudinal extension of the system 10, for example a length L, L', as shown in [Fig. 7].The longitudinal dimension L, L' is determined as a function of the transverse dimension D, D', and at least one dimension of a bend in the pipeline, to allow each elementary module 13, 13', 13" and the sealing device 12 of the system 10 in CTS transport configuration to pass through said bend in the pipeline 20.

[0079] For example, at least one dimension of a pipe bend is a radius of curvature RC of a central axis of the pipe at the bend in question and an inside diameter Dint of a pipe section 20. The radius of curvature RC is geometrically defined as half the sum of an external radius of curvature RCE, or radius of the extrados inside the bend, and an internal radius of curvature RCI, or radius of the intrados inside, at the level of the elbow considered, as illustrated in [Fig.7].

[0080] More precisely, the function can be written for example:

[0081] [Math 1]

[0082] L=Sin(Arcos((D+RC-Dint / 2) / (RC+Dint / 2)))*2*(RC+Dint / 2).

[0083] Thus, the sealing system 10, composed of elementary modules 13, 13', 13”, and a sealing device 12, each being circumscribed, without the mobility subsets 14, 14', 14”, within a virtual geometric envelope defined by a diameter D and a length L, is capable of moving within a pipe 20 comprising one or more bends whose average radius of curvature is greater than or equal to RC and whose internal diameter is greater than or equal to Dint.

[0084] According to these provisions, the sealing system 10 is capable, thanks to the particular dimensioning described above of the elementary modules 13, 13', 13”, and of the sealing device 12 which make up said sealing system 10, as well as thanks to the flexibility of the linking components 17 which connect the elementary modules 13, 13', 13”, and the sealing device 12 which make up said sealing system 10, and also thanks to the distribution of the support and rolling points inside the pipeline, of moving inside a pipeline even if the pipeline 20 has bends and even if some portions of the pipeline 20 are not horizontal; The shuttering system 10 is also capable, thanks to the mechanical support sub-assembly, of depositing the shuttering device 12 at a shuttering point, without the shuttering device risking detachment if the shuttering sub-assembly 15 were to fail.

[0085] When the system 10 is in CTS transport configuration, and the sealing sub-assembly 15 is in COU opening configuration, and the holding sub-assembly 16 is in CLM free configuration, the system is configured to transport the sealing device 12 from one point to another point in the pipeline 20, in both directions of the longitudinal extension direction of the pipeline 20.

[0086] When the sealing subassembly 15 is in the COU opening configuration, and simultaneously the holding subassembly 16 is in the CMM mechanical holding configuration, the system 10 in the CTS transport configuration is configured to transport the sealing device 12 from one point to another point in the pipeline 20, in only one direction of the longitudinal extension of the pipeline 20, movement in the other direction being prevented by the mechanical holding subassembly; a transition from a CLS release configuration of the system to a CTS transport configuration of the system is thus facilitated, by allowing the transport subsystem 11 of the system in the CLS release configuration to take support from the sealing device 12 to move the system 10 into CTS transport configuration, simultaneously preventing the sealing device 12 from detaching from the pipe wall 20 in a direction opposite to the transport subsystem 11 during the transition of system 10 from the CLS release configuration to the CTS transport configuration.

[0087] The retaining sub-assembly 16 can take the mechanical retaining configuration CMM when the sealing sub-assembly 15 is in the sealing configuration COB, as schematically illustrated in Figure 6b, or when the sealing sub-assembly 15 is, for example accidentally, in the opening configuration COU, to prevent in the latter case the sealing device 12 from detaching from the wall of the pipe 20.

[0088] According to a particular embodiment, the transport subsystem 11 of the sealing system 10 comprises an elementary module 13 which is an inerting device 13; said inerting device 13 comprises a sealing subset 15 and an inerting subset 13; the sealing subset 15 of the inerting device 13 is configured to switch, when the system 10 is in the CLS system release configuration, from a COU opening configuration (not shown in Figure 6b), to a COB sealing configuration as shown in Figure 6b in which the sealing subset 15 of the inerting device 13 ensures a tight sealing of the pipe 20 at another sealing point of the pipe 20; the inerting sub-assembly 13 is further configured to inject an inert gas into the portion of the pipeline between the sealing point PO and the other sealing point.

[0089] Thus, the sealed zone of the pipeline 20 created between the two sealing points is inertified by the mixing of the inert gas with the gas previously existing in this same zone.

[0090] According to one embodiment, the inerting sub-assembly includes a purge allowing at least part of the gas existing in the portion of the pipeline between the sealing point PO and the other sealing point to be purged before the injection of the inert gas, in order to maintain a pressure equal to a set pressure, for example atmospheric.

[0091] According to one embodiment, the inert gas is denser than the existing gas. The sealing device 12 includes another purge, the purge of the inerting device 13 being closed and the other purge being open to purge at least a portion of the gas present in the portion of the pipeline between the sealing point PO and the other sealing point before the injection of the inert gas, when an altitude of the purge of the inerting device 13 is lower than an altitude of the other purge; or conversely, the purge of the inerting device 13 is open and the other purge of the sealing device 12 is closed to purge a portion of the gas present in the portion of the pipe included between the sealing point PO and the other sealing point before the injection of the inert gas, when an altitude of the purge of the inerting device 13 is greater than an altitude of the other purge.

[0092] According to a more particular embodiment, the inerting sub-assembly includes lighting and a camera allowing visual inspection of the portion of the pipeline.

[0093] According to an even more particular embodiment, the inerting sub-assembly includes an oxygenometer for validating the oxygen level in the sealed portion of the pipeline.

[0094] According to one embodiment, the linking component 17 is configured to allow the passage from the transport subsystem 11 to the sealing device 12 of an inflation circuit of the inflatable component of the sealing subassembly 15 of the sealing device 12 and / or of an activation circuit of a pneumatic cylinder 16 of at least two holding components 16 of the sealing device 12 and / or of an electrical supply circuit of the sealing device 12.

[0095] According to one embodiment, the inflation circuit of the inflatable component of the sealing device and the activation circuit of a pneumatic cylinder of at least two holding components of the sealing device are coupled so that the retraction of the pneumatic cylinder of at least two holding components activates a deflation of the inflatable component.

[0096] According to one aspect of the invention, it relates to a method of sealing and / or inerting a pipeline of a nuclear power plant using a sealing system 10 according to one of the embodiment examples described above.

Claims

1. Demands Pipeline (20) sealing system (10) comprising a transport subsystem (11) and a sealing device (12), the transport subsystem (11) being motorized, configured to move inside the pipe (20) in the direction of a longitudinal extension of the pipe (20), the system (10) further being configured to alternately and reversibly switch from a transport configuration (CTS) of the system in which the sealing device (12) is connected to the transport subsystem (11) by a flexible linking component (17), to a release configuration (CLS) of the system in which the sealing device (12) is detached from the transport subsystem (H), the system (10) further comprising at least one mobility subassembly (14, 14',14”) configured to be mounted on the transport subsystem (11) and on the sealing device (12) and deployed transversely to the longitudinal extension of the pipeline (20) such that at least one mobility subassembly (14, 14', 14”) is supported on at least two support points distributed over a section of an inner wall of the pipeline (20) when deployed, so that the system (10) is mechanically returned, transversely to the longitudinal extension of the pipeline (20), towards a central area of ​​the section of the pipeline (20), while simultaneously ensuring longitudinal mobility of the system (10) in the direction of the longitudinal extension of the pipeline (20); the sealing device (12) comprising a sealing sub-assembly (15) configured to transition from a sealing configuration (COB) in which the sealing sub-assembly (15) provides a tight seal of the pipe (20) at a sealing point (PO) of the pipe (20), the sealing being tight against a fluid flowing in the pipe at the sealing point (PO) of the pipe (20), to an opening configuration (COU) in which the sealing sub-assembly (15) does not provide a tight seal of the pipe (20); the shuttering device (12) further comprising a retaining subassembly (16) configured to transition from a configuration of mechanical maintenance (CMM) in which the maintenance sub-assembly (16) provides mechanical maintenance of the sealing device (12) bearing against the inner wall of the pipe (20), to a free configuration (CLM) in which the sealing device (12) is not maintained by the maintenance sub-assembly (16).

2. System (10) according to claim 1, wherein the transport subsystem (11) comprises an elementary module (13) connected by the flexible link component (17) to the closing device (12), or comprises an elementary module (13) connected by the flexible link component (17) to the closing device (12) and connected, directly or indirectly, by another flexible link component (17') to at least one other elementary module (13', 13”), the at least one other elementary module (13', 13”) and the elementary module (13) and the closing device (12) each being circumscribed within a virtual geometric envelope having a transverse dimension (D, D') measured in a plane transverse to the longitudinal extension of the system (10), and a longitudinal dimension (L, L') measured along a longitudinal extension of the system (10), the longitudinal dimension (L, L') being determined as a function of the transverse dimension (D, D'),and at least one dimension of a pipe bend to allow the system (10) in transport configuration (CTS) to pass through the pipe bend.

3. System (10) according to any one of claims 1 or 2, wherein each support point of at least two support points of at least one mobility subset (14, 14') comprises a wheel bearing against the inner wall of the pipeline.

4. System (10) according to claim 3, wherein at least one mobility subset (14, 14') further comprises at least one elastic return mechanism, for example a spring, associated with the wheel configured to keep the wheel in contact with the point on the inner wall of the pipe.

5. A system (10) according to one of the preceding claims, wherein the sealing subassembly (15) comprises an inflatable component (15) disposed around the sealing device (12), transversely to the longitudinal extension of the system (10) and the pipeline (20), the inflatable component (15) being deflated in the opening configuration of the sealing subassembly, the inflatable component (15) is further configured to ensure, in the inflated state, in the sealing configuration (COB) of the sealing subassembly (15), a first watertight contact with the inner wall of the pipeline at the sealing point (PO) and a second watertight contact with the sealing device (12), so that in the inflated state of the inflatable component (15), the pipeline is hermetically sealed by the sealing device (12).

6. System according to any one of the preceding claims, wherein the retaining subassembly (16) comprises at least two retaining components (16) configured to be deployed in the mechanical retaining configuration (MRC), the at least two retaining components being deployed transversely to the longitudinal extension of the pipeline (20) to bear on different points of a section of the inner wall of the pipeline (20).

7. System according to claim 6, wherein the at least two retaining components (16) comprise a unidirectional rolling component, the unidirectional rolling component being configured to provide mobility in only one direction of the longitudinal extension direction of the pipe (20), the mobility being locked in the other direction.

8. System according to claim 7, wherein the only direction of mobility is oriented from the sealing device (12) towards the transport subsystem (11).

9. System according to any one of the preceding claims, wherein the linking component (17) comprises a terminal part (18) configured to cooperate with a complementary member (19) of the sealing device (12).

10. System according to claim 9, wherein the terminal part (18) comprises a camera configured to observe through the shutter device (12) via a transparent wall when the terminal part (18) cooperates with the complementary member (19) of the shutter device (12) to connect the shutter device (12) to the transport subsystem (11).

11. System (10) according to any one of the preceding claims, wherein the elementary module (13) is an inerting device (13), the inerting device (13) comprising a sealing subassembly (15) and an inerting subassembly (13), the sub- the sealing assembly (15) of the inerting device (13) being configured to switch, when the system (10) is in the system release configuration (CLS), from an opening configuration (COU) to a sealing configuration (COB) in which the sealing sub-assembly (15) of the inerting device provides a tight sealing of the pipeline (20) at another sealing point of the pipeline (20), the inerting sub-assembly (13) being configured to inject an inert gas into the portion of the pipeline between the sealing point (PO) and the other sealing point.

12. System (10) according to any one of the preceding claims, wherein the linking component (17) is configured to allow passage from the transport subsystem (11) to the sealing device (12) of an inflation circuit of the inflatable component of the sealing subassembly (15) of the sealing device (12) and / or of an activation circuit of a pneumatic cylinder (16) of at least two retaining components (16) of the sealing device (12) and / or of a power supply circuit of the sealing device (12).

13. A method for sealing and / or inerting a pipeline in a nuclear power plant comprising the use of a system according to one of the preceding claims.

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