Method of manufacturing by welding a dynamic sealing member, configured to equip a rotating joint device of a fluid exploitation installation, in particular on an offshore platform

Abstract

The invention relates to a method for manufacturing by welding a dynamic sealing member (30) comprising the steps of: - positioning two ends (55, 56) of the member in a mold (65) of a welding system (60), facing each other and at a first non-zero predetermined distance so as to provide a filling space (66) between them in the mold; - injecting a volume of a predetermined material into this space; - bringing the ends of the member together while keeping them facing each other and with a spacing of a second non-zero predetermined distance, so as to reduce the filling space in the mold and thus press each of the ends against the predetermined material injected into this space; and - removing the mold arranged around a weld junction (57) thus formed on the dynamic sealing member. (Figure 6)

Description

Title of the invention: Method of manufacturing by welding a dynamic sealing member, configured to equip a rotating joint device of a fluid exploitation installation, in particular on an offshore platform Technical field of the invention

[0001] The invention relates to installations for exploiting fluids, for example hydrocarbons, on offshore type platforms, and in particular to dynamic sealing members configured to equip the rotating joint devices used in such installations.

[0002] In particular, the invention relates to a method of manufacturing by welding a dynamic sealing member configured to equip a rotating joint device, as well as a dynamic sealing member obtained by implementing the method.

[0003] The invention also relates to a system for implementing such a manufacturing method by welding a dynamic sealing member. State of the art

[0004] The rotating joint devices installed in pressure installations can find an application in the offshore field, for example in oil production vessels, allowing in particular the exploitation of hydrocarbon fields at sea. Floating production, storage and unloading units can be formed by a vessel which is mobile, due to its environment, around a mooring turret which is geostationary. The vessel can be temporarily secured to the turret. The installations can comprise conduits which form a network of underwater pipes and which allow fluid communication for the transfer of a fluid between the seabed and the vessel.

[0005] To ensure the seal between the ship and the turret and thus ensure the integrity of the fluid transfer, the rotating joint devices are provided with a first part, called fixed, secured to the turret and a second part, called mobile, secured to the ship. The second part of the rotating joint devices is therefore mobile in rotation relative to the first part of the rotating joint devices. The rotating joint devices are further provided with several dynamic sealing members, called dynamic seals, arranged in spaces provided between the first fixed part and the second mobile part of the rotating joint devices.

[0006] Such dynamic sealing members may, for example, comprise lips whose function is to ensure sealing against the fluid.

[0007] Use in fluid operating installations generates stresses on the dynamic sealing members, which may need to be replaced, in situ, i.e. directly on the installation.

[0008] European patent EP 0 988 141 describes a method of manufacturing by so-called butt welding a dynamic sealing member. In particular, it teaches placing two end faces of this member against each other, holding them, heating them and pressing them against each other so as to form the annular dynamic sealing member for its installation in the rotating joint device.

[0009] European patent EP 2 350 223 describes a method of forming a sealing ring, comprising the steps of heating an extruded thermoplastic rod to a temperature above a glass transition temperature, the extruded rod having first and second ends, bending the extruded rod to form a circular structure while the temperature is above the glass transition temperature, pressing the first and second ends against each other and thereby joining the first and second ends of the extruded rod to form a semi-finished ring, and annealing the semi-finished ring.

[0010] European patent EP 3 102 385 describes a process similar to that described in European patent EP 2 350 223, except that the bending is carried out at room temperature, maintaining stresses on the rod which are below the elastic limit. Statement of the invention

[0011] The invention relates to a method of manufacturing by welding a dynamic sealing member configured to equip a rotating joint device of a fluid exploitation installation, in particular on an offshore platform, which is simple, convenient and economical.

[0012] The invention thus relates, in a first aspect, to a method of manufacturing by welding a dynamic sealing member configured to equip a rotating joint device of a fluid exploitation installation, in particular on an offshore platform, comprising the steps of providing a dynamic sealing member having a first end and a second end opposite its first end, of providing a welding system configured to connect the first end with the second end of the dynamic sealing member and of connecting them to obtain the annular dynamic sealing member; characterized in that the method comprises the steps of:

[0013] - position the first end and the second end of the sealing member dynamic in a mold of the welding system, facing each other and at a first predetermined non-zero distance so as to provide a filling space between them in the mold of the welding system;

[0014] - injecting a volume of a predetermined material into the space provided in the mold of the welding system between the first end and the second end of the dynamic sealing member;

[0015] - bringing the first end and the second end of the sealing member closer together dynamic by keeping them facing each other and with a spacing of a second non-zero predetermined distance, so as to reduce the filling space in the mold of the welding system and thus press each of the first end and the second end against the predetermined material injected into the filling space; and

[0016] - removing the mold placed around a weld junction thus formed on the member dynamic sealing.

[0017] In the method according to the invention, the ends of the dynamic sealing member are not directly abutted. The injection of a volume of a predetermined material into the non-zero space provided in the mold of the welding system between the first end and the second end allows material to be supplied between these ends.

[0018] Such an addition of material into the filling space delimited by the mold and each of the first and second ends, combined with a reduction in the spacing between these ends compared to the time when the addition of material is carried out, makes it possible to generate a weld junction, or weld edges, without or almost without blistering.

[0019] The method according to the invention thus makes it possible to carry out welding, in particular in situ, of a dynamic sealing member or of segments forming this dynamic sealing member in a simple and convenient and particularly precise manner.

[0020] It will be noted that the dynamic sealing member can be made of a material identical to the predetermined volume of material injected into the filling space.

[0021] Preferred, simple, convenient and economical characteristics of the method according to the invention are presented below.

[0022] The method may comprise a step of mechanically securing portions of the dynamic sealing member located near each of the first and second ends on carriages, at least one of which is movable to move the first and second ends from a first spacing corresponding to the first non-zero predetermined distance to a second spacing corresponding to the second non-zero predetermined distance.

[0023] The method may comprise a step of in situ monitoring of the first spacing and / or the second spacing.

[0024] The method may include the step of injecting under pressure the predetermined volume of material into the filling space and the mold may be provided with an evacuation orifice allowing the circulation of the predetermined volume of material therethrough. of the filling space.

[0025] The method may comprise a step of heating the mold before the step of injecting the predetermined volume of material and / or a step of heating the predetermined volume of material before its injection into the filling space.

[0026] The method may include a step of in situ monitoring of the weld joint.

[0027] The method may include a step of deburring the weld joint.

[0028] The invention also relates, in another aspect, to a welding system for implementing the manufacturing method by welding of a dynamic sealing member, as described above, comprising a mold provided with an envelope defining an internal space and lateral openings configured to receive a first end and a second end of the dynamic sealing member facing and at a distance from each other, and a device for injecting a predetermined volume of material in fluid communication with the internal space of the mold envelope.

[0029] The mold may be a single-use mold and / or a mold having at least two mold parts movable relative to each other.

[0030] The welding system may include carriages configured to mechanically secure portions of the dynamic sealing member located proximate to each of the first and second ends, with at least one of the carriages being movable to move the first and second ends from a first spacing corresponding to a first non-zero predetermined distance to a second spacing corresponding to a second non-zero predetermined distance.

[0031] The injection device may be configured to pressurize the predetermined volume of material and the mold may include an inlet port for pressurized injection of the predetermined volume of material and an outlet port for circulation of the predetermined volume of material through the filling space.

[0032] The mold may comprise a first heating member of the envelope configured to heat the envelope before injecting the predetermined volume of material and / or the injection device comprises a second heating member of the predetermined volume of material configured to heat the predetermined volume of material before its injection into the filling space.

[0033] The welding system may include a first controller configured to control a positioning of the first and second ends of the dynamic sealing member and / or a second controller configured to control a weld joint formed between the first and second ends of the dynamic sealing member.

[0034] The invention also relates, in another aspect, to a dynamic sealing member configured to equip a rotating joint device of an installation. fluid operating system, said dynamic sealing member being obtained by implementing the method as described above.

[0035] The invention also relates, in yet another aspect, to an installation for exploiting fluids, for example a hydrocarbon and in particular on an offshore platform, comprising at least one rotating joint device having at least one dynamic sealing member as described above and which is housed inside a spacing space located between a first annular part which is secured to a fixed mooring turret of said installation and a second annular part movable in rotation relative to said first annular part and which is secured to a mobile ship of said installation. Brief description of the figures

[0036] We will now continue the description of the invention by describing exemplary embodiments, given below for illustrative and non-limiting purposes, with reference to the appended drawings.

[0037] [Fig. 1] schematically and partially represents a fluid exploitation installation on an offshore platform, provided with a ship, a mooring turret, a network of underwater pipes allowing fluid communication for the transfer of the fluid between the seabed and the ship, and a rotating joint device ensuring the seal between the ship and the turret and the integrity of the fluid transfer.

[0038] [Fig.2] is a top view of the rotating joint device of the installation illustrated in [Fig.l].

[0039] [Fig. 3] is a partial sectional view of the rotating joint device, marked III-III in [Fig. 2].

[0040] [Fig. 4] is a block diagram illustrating a method of manufacturing by welding a dynamic sealing member configured to equip a rotating joint device such as that of Figures 1 to 3.

[0041] [Fig.5] schematically illustrates in perspective a welding system for the manufacture by welding of a dynamic sealing member according to the method of [Fig.4],

[0042] [Fig.6] illustrates, in section, a detail of the welding system of [Fig.5].

[0043] [Fig. 7] is a block diagram illustrating in more detail the welding manufacturing process of [Fig. 4], implemented using the welding system of Figures 5 and 6. Detailed Description

[0044] [Fig.l] illustrates a fluid exploitation installation 1 on an offshore platform, allowing the exploitation of hydrocarbon fields at sea 2.

[0045] This installation 1, also called floating production, storage and de- loading, can be provided with a ship 3 which is mobile, due to its environment formed by the sea 2, and a mooring turret 4 which is geostationary and around which the ship 3 is mobile.

[0046] The mooring turret 4 can for example be mechanically secured to the seabed 2 via underwater anchors 5.

[0047] The ship 3 can be movable relative to the mooring turret 4 by means of a rolling mechanism 7.

[0048] The installation 1 may be provided with conduits 6 which form a network of underwater pipes allowing fluid communication for the transfer of the fluid between the seabed and the ship 3.

[0049] The fluid circulating in the conduits 6 comes from the bottom of the sea 2.

[0050] The installation 1 comprises a rotating joint device 10 ensuring the seal between the ship 3 and the mooring turret 4 and the integrity of the transfer of fluids.

[0051] The rotating joint device 10 may be formed from a rotating joint (“swivel device” in English terminology) or from a stack of such joints (“swivel stack device” in English terminology).

[0052] As illustrated in [Fig.2], such a rotating joint device 10 is generally annular and comprises a first annular part 11, called fixed, which is configured to be secured to the mooring turret 4, as well as a second annular part 12, called mobile, which is configured to be secured to the ship 3.

[0053] In the example described, the second annular part 12 is movable in rotation relative to the first annular part 11, by means of a rolling member 13 at least partially interposed between the first and second annular parts 11 and 12.

[0054] The rotating joint device 10 has an internal space 14 defined here by an internal surface 15 of the first annular part 11.

[0055] The installation 1 further comprises a transfer conduit 16 connected, directly or indirectly, to at least one of the underwater conduits 6.

[0056] The transfer conduit 16 enters the rotating joint device 10 through its internal space 14 and opens outside the rotating joint device 10 through an outlet connection 17.

[0057] The transfer conduit 16 thus passes through the rotating joint device 10, entering the first annular part 11 and exiting through the second annular part 12.

[0058] [Fig. 3] shows in section the rotating joint device 10 of [Fig. 2] and illustrates in more detail the fluid path through the rotating joint device 10 and the cooperation between the first and second annular parts 11 and 12.

[0059] The rotating joint device 10 is provided with a transfer chamber 18 formed partially by a first orifice 19 formed in the first annular part 11 and by a second orifice 20 formed in the second annular part 12 and at least partially opposite the first orifice 19.

[0060] The transfer chamber 18 is here annular, or toroidal.

[0061] The first orifice 19 opens at the level of the internal surface 15 of the first annular part 11 into a first portion of the transfer conduit 16 located in the internal space 14 of the rotating joint device 10 and which is connected to the underwater conduits 6.

[0062] The second orifice 20 opens at an external surface 21 of the second annular part 12 into a second portion of the transfer conduit 16 located outside the rotating joint device 10 and which comprises the outlet connector 17.

[0063] An arrow illustrated in [Fig.3] shows the fluid path taken by the fluid coming from the conduits 6 and conveyed by the transfer conduit 16 passing through the first and second annular parts 11 and 12 of the rotating joint device 10, up to the outlet connection 17.

[0064] The rotating joint device 10 is further provided with a spacing space 22 located between the first annular part 11 and the second annular part 12.

[0065] The spacing space 22 is provided to allow rotation of the second annular part 12 relative to the first annular part 11.

[0066] In the example described, the spacing space 22 is interrupted by the transfer chamber 18.

[0067] Thus, on an upper portion 23 of the rotating joint device 10, the spacing space 22 extends from the rolling member 13 until it opens into the transfer chamber 18; while on a lower portion 24 of the rotating joint device 10, the spacing space 22 opens at one end into the transfer chamber 18 and opens at an opposite end outside the rotating joint device 10.

[0068] The transfer chamber 18 is here interposed between the upper and lower portions 23 and 24.

[0069] In particular, the spacing space 22 is provided between an external surface of the first annular part 11, which external surface is opposite its internal surface 15, and an internal surface of the second annular part 12, which internal surface is opposite its external surface 21.

[0070] The rotating joint device 10 comprises dynamic sealing members 30 housed at least partially inside the spacing space 22, in the upper and lower portions 23 and 24 of the rotating joint device 10.

[0071] These dynamic sealing members 30 are provided to seal the spacing space 22.

[0072] These dynamic sealing members 30 may comprise, for example, lips having the function of ensuring sealing against the fluid.

[0073] In the example described, three dynamic sealing members 30 are housed at least partially inside the spacing space 22 in the upper portion 23 of the rotating joint device 10 and three dynamic sealing members 30 are housed at least partially inside the spacing space 22 in the lower portion 24 of the rotating joint device 10.

[0074] The rotating joint device 10 here further comprises several protection devices 35 for the dynamic sealing members 30.

[0075] Alternatively, there could be more or less and not necessarily the same number in the upper and lower portions.

[0076] In the example described, a protection device 35 is housed at least partially inside the spacing space 22 in the upper portion 23 of the rotating joint device 10 and two protection devices 35 are housed at least partially inside the spacing space 22 in the lower portion 24 of the rotating joint device 10.

[0077] The rotating joint device 10 may also comprise a cleaning device 50 configured to evacuate debris that may be contained in said fluid and which is here formed by a channel formed in the second annular part 12 and which opens into the spacing space 22 at the level of a protection device 35.

[0078] Alternatively, there could be more or less protection devices and / or cleaning devices, or none at all.

[0079] In such an installation 1, the dynamic sealing members 30 may need to be replaced. For economic reasons, it is not possible to dismantle the rotating joint device 10 equipping the installation 1 during production. Consequently, the replacement or repair of a dynamic sealing member 30 must be done in situ, that is to say on the platform and in particular directly on the rotating joint device 10.

[0080] For this purpose, figures 4 to 7 show a welding system 60 for implementing a manufacturing method by welding of such a dynamic sealing member 30 as well as the steps of this method.

[0081] With reference to [Fig. 4], the welding manufacturing method generally comprises the step 100 of providing the replacement dynamic sealing member 30 or segments of such a member if it is for example a repair, the step 110 of providing a welding system 60 and the step 120 of connecting by welding a first end 55 of the dynamic sealing member 30 with a second end 56 opposite the first end 55 of the dynamic sealing member 30 and connecting them to obtain the annular dynamic sealing member 30.

[0082] With reference to Figures 5 and 6, the welding system 60 comprises a mold 65 provided with an envelope 68 defining an internal space 64 and lateral openings 69 configured to receive a first end 55 and a second end 56 of the dynamic sealing member 30 facing and at a distance from each other.

[0083] The welding system 60 comprises a device 70 for injecting a predetermined volume of material in fluid communication with the internal space 64 of the envelope 68 of the mold 65.

[0084] The predetermined material may for example be provided in the form of a wire 75.

[0085] The mold 65 may be a single-use mold and / or a mold having at least two mold parts movable relative to each other.

[0086] The envelope 68 of the mold 65 has an internal face shaped like the dynamic sealing member 30, so that the internal space 64 generally defines a section identical to that of this member.

[0087] In the illustrated example, the welding system 60 comprises carriages 67 configured to mechanically secure portions 58 of the dynamic sealing member 30 located near each of the first and second ends 55 and 56.

[0088] At least one of the carriages 67 is movable to move the first and second ends 55 and 56, for example, from a first spacing corresponding to a first non-zero predetermined distance to a second spacing corresponding to a second non-zero predetermined distance (see below).

[0089] It will be noted that in the first position of separation of the first and second ends 55 and 56, the zone separating them in the internal space 64 of the envelope 68 can be defined as a filling space 66.

[0090] The carriages 67 are here each provided with a base 72 on which is mounted a ring 73 forming a clamp around the portions 58 of the dynamic sealing member 30.

[0091] The welding system 60 here comprises a first controller 74 mechanically secured to at least one of the bases 72 and configured to set the carriage(s) 67 in motion.

[0092] The first controller 74 may further be configured to control the positioning of the first and second ends 55 and 56 of the dynamic sealing member 30, using position sensors.

[0093] The injection device 70 may be configured to pressurize the predetermined volume of material and the casing 68 of the mold 65 may comprise an inlet orifice 71 in fluid communication with the injection device 70 and opening into the internal space 64 of the mold 65 for the injection under pressure of the predetermined volume of material.

[0094] The casing 68 of the mold 65 may further comprise an evacuation orifice 78 in fluid communication with a collection tank 77 and also opening into the internal space 64 of the mold 65.

[0095] The discharge orifice 78 allows the circulation of the predetermined volume of material through the internal space 64 of the mold and therefore through the filling space 66.

[0096] It will be noted that the welding system comprises conduits and may also comprise valves and / or flaps to allow the opening and / or closing of these conduits.

[0097] In the illustrated example, the mold 65 also comprises a first heating member 76 of the envelope 68 configured to heat the envelope 68 before injecting the predetermined volume of material.

[0098] In addition, the injection device 70 may comprise a second heating member (not shown) of the predetermined volume of material configured to heat the predetermined volume of material before its injection into the filling space 66.

[0099] In the illustrated example, the welding system 60 may comprise a second controller (not shown) configured to control a weld junction 57 formed between the first and second ends 55 and 56 of the dynamic sealing member.

[0100] This second controller can be placed in situ in the mold 65.

[0101] The method of manufacturing by welding the sealing member using the welding system 60 described above will be described in more detail.

[0102] In particular, with reference to [Fig.7] and also to [Fig.6], the welding manufacturing method comprises the step 140 of positioning the first end 55 and the second end 56 of the dynamic sealing member 30 in the mold 65 of the welding system 60, facing each other and at a first non-zero predetermined distance so as to provide a filling space 66 between them in the mold 65.

[0103] In the example illustrated, the welding manufacturing method may optionally include the step 150 of mechanically securing portions 58 and 59 of the dynamic sealing member 30 located near each of the first and second ends 55 and 56 on carriages 67, at least one of which is mobile.

[0104] The welding manufacturing method may optionally include step 160 of in situ monitoring of the first spacing using the first position sensor.

[0105] The welding manufacturing method comprises the step 170 of injecting a volume of a predetermined material into the filling space 66 provided in the mold 65 of the welding system 60 between the first end 55 and the second end 56 of the dynamic sealing member 30.

[0106] In the illustrated example, step 170 of injecting the predetermined volume of material into the filling space 66 is carried out under pressure through the inlet orifice 71 of the mold and thanks to the injection device 70.

[0107] The discharge orifice 78 of the mold 65 allows the circulation of the predetermined volume of material through the filling space 66.

[0108] The welding manufacturing method may optionally include the step 180 of heating the mold 65 before the step 170 of injecting the predetermined volume of material.

[0109] The welding manufacturing method may also optionally include the step 190 of heating the predetermined volume of material before its injection into the filling space 66.

[0110] The welding manufacturing method comprises the step 200 of bringing the first end 55 and the second end 56 of the dynamic sealing member 30 together while keeping them facing each other and with a spacing of a second non-zero predetermined distance, so as to reduce the filling space 66 in the mold 65 of the welding system 60 and thus press each of the first end 55 and the second end 56 against the predetermined material injected into the filling space 66.

[0111] In the example, the bringing together step 200 can be carried out by moving at least one of the carriages 67, which is mobile, or both carriages 67 if they are mobile, so as to move the first and second ends 55 and 56 from a first spacing corresponding to the first non-zero predetermined distance to a second spacing corresponding to the second non-zero predetermined distance.

[0112] The welding manufacturing method may optionally include step 210 of in situ monitoring of the second spacing using the second position sensor.

[0113] The welding manufacturing method may include the step 220 of in situ checking of the weld junction 57.

[0114] The welding manufacturing method comprises the step 230 of removing the mold 60 arranged around a weld junction 57 thus formed on the annular dynamic sealing member 30.

[0115] The welding manufacturing method may include the step 240 of deburring the weld joint 57.

[0116] It will be noted that the dynamic sealing member 30 can be made of a material identical to the predetermined volume of material injected into the filling space 65.

[0117] It will also be noted that the predetermined material may be formed from at least one thermoplastic, preferably composed of at least polyetheretherketone, called PEEK, or even optionally also of at least polytetrafluoroethylene, called PTFE.

[0118] An example of a method as described above may be implemented in a sequence determined as follows:

[0119] - assembly of the ends in the mold according to the first spacing;

[0120] - control of the position of the ends and adjustment of an extrusion clearance and therefore of the desired diameter of the dynamic sealing member;

[0121] - heating the predetermined material in the injection device;

[0122] - progressive heating of the internal space of the mold, for example by circulation of a gas until approaching a glass transition temperature of the material;

[0123] - depressurization of the filling space;

[0124] - injection under pressure of the material into the filling space and recovery of the excess material in the collection tank;

[0125] - progressive bringing together of the ends up to the second spacing;

[0126] - positioning control then control of the weld joint;

[0127] - demolding and removal of the dynamic sealing member: and

[0128] - deburring of the weld joint.

[0129] In the method described above, the ends of the dynamic sealing member are not directly abutted. The injection of a volume of a predetermined material into the non-zero space provided in the mold of the welding system between the first end and the second end allows material to be supplied between these ends.

[0130] Such an addition of material into the filling space delimited by the mold and each of the first and second ends, combined with a reduction in the spacing between these ends compared to the time when the addition of material is carried out, makes it possible to generate a weld junction, or weld edges, without or almost without blistering.

[0131] This method thus makes it possible to carry out welding, in particular in situ, of a dynamic sealing member or of segments forming this dynamic sealing member in a simple and convenient and particularly precise manner.

[0132] More generally, the invention finds an application in ships or floating units in the offshore field allowing the production and / or transformation and / or treatment and / or storage and / or unloading of fluids and / or energy, in particular electrical energy and / or signals.

[0133] More generally, the invention is not limited to the examples described and represented.

Claims

Claims

1. Method of manufacturing by welding a dynamic sealing member (30) configured to equip a rotating joint device (10) of an installation (1) for exploiting fluids, in particular on an offshore platform, comprising the steps of providing (100) a dynamic sealing member having a first end (55) and a second end (56) opposite its first end, of providing (110) a welding system (60) configured to connect the first end with the second end of the dynamic sealing member and of connecting them (120) to obtain the annular dynamic sealing member;characterized in that the method comprises the steps of: - positioning (140) the first end and the second end of the dynamic sealing member in a mold (65) of the welding system, opposite one another and at a first non-zero predetermined distance so as to provide a filling space (66) between them in the mold of the welding system; - injecting (170) a volume of a predetermined material into the space provided in the mold of the welding system between the first end and the second end of the dynamic sealing member;- bringing together (200) the first end and the second end of the dynamic sealing member while keeping them facing each other and with a spacing of a second non-zero predetermined distance, so as to reduce the filling space in the mold of the welding system and thus press each of the first end and the second end against the predetermined material injected into the filling space; and - removing (230) the mold arranged around a weld junction thus formed on the dynamic sealing member.;

2. Method according to claim 1, characterized in that it comprises a step (150) of mechanically securing portions (58) of the dynamic sealing member (30) located near each of the first and second ends (55, 56) on carriages (67) of which at least one is movable to move the first and second ends from a first spacing corresponding to the first non-zero predetermined distance to a second spacing corresponding to the second non-zero predetermined distance.

3. Method according to claim 2, characterized in that it comprises a step (160, 210) of checking in situ the first spacing and / or the second spacing.

4. Method according to any one of claims 1 to 3, characterized in that it comprises the step of injecting (170) under pressure the predetermined volume of material into the filling space (66) and the mold (65) is provided with an evacuation orifice (78) allowing the circulation of the predetermined volume of material through the filling space.

5. Method according to any one of claims 1 to 4, characterized in that it comprises a step of heating (180) the mold (65) before the step of injecting the predetermined volume of material and / or a step (190) of heating the predetermined volume of material before its injection into the filling space (66).

6. Method according to any one of claims 1 to 5, characterized in that it comprises a step (220) of in situ checking of the weld junction (57).

7. Method according to any one of claims 1 to 6, characterized in that it comprises a step (240) of deburring the weld junction (57).

8. Welding system for implementing the method of manufacturing by welding a dynamic sealing member, according to any one of claims 1 to 7, comprising a mold (65) provided with a casing (68) defining an internal space (64) and lateral openings (69) configured to receive a first end (55) and a second end (56) of the dynamic sealing member (30) facing and at a distance from each other, and an injection device (70) of a predetermined volume of material in fluid communication with the internal space of the casing of the mold.

9. Welding system according to claim 8, characterized in that the mold (65) is a single-use mold or a mold having at least two mold parts movable relative to each other.

10. Welding system according to one of claims 8 and 9, characterized in that it comprises carriages (67) configured to mechanically secure portions (58) of the dynamic sealing member (30) located near each of the first and second ends (55, 56), with at least one of the carriages being movable to move the first and second ends from a first spacing corresponding to a first non-zero predetermined distance to a second spacing corresponding to a second predetermined non-zero distance.

11. Welding system according to any one of claims 8 to 10, characterized in that the injection device (70) is configured to pressurize the predetermined volume of material and the mold (65) comprises an inlet orifice (71) for the injection under pressure of the predetermined volume of material and an outlet orifice (78) for the circulation of the predetermined volume of material through the filling space (66).

12. Welding system according to any one of claims 8 to 11, characterized in that the mold (65) comprises a first heating member (76) of the envelope (68) configured to heat the envelope before injecting the predetermined volume of material and / or the injection device (70) comprises a second heating member of the predetermined volume of material configured to heat the predetermined volume of material before its injection into the filling space (66).

13. Welding system according to any one of claims 8 to 12, characterized in that it comprises a first controller (74) configured to control a positioning of the first and second ends of the dynamic sealing member (30) and / or a second controller configured to control a weld junction (57) formed between the first and second ends (55, 56) of the dynamic sealing member.

14. Dynamic sealing member configured to equip a rotating joint device (10) of a fluid exploitation installation (1), said dynamic sealing member being obtained by implementing the manufacturing method according to any one of claims 1 to 7.

15. Installation for exploiting fluids, for example a hydrocarbon and in particular on an offshore platform, comprising at least one rotating joint device (10) having at least one dynamic sealing member (30) according to claim 14 and which is housed inside a spacing space (22) located between a first annular part (11) which is subject to a fixed mooring turret (4) of said installation (1) and a second annular part (12) movable in rotation relative to said first annular part and which is subject to a mobile ship (3) of said installation.

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