PROCESS FOR HANDLING OF CABLE BY VESSEL HULL TRAILER

The present invention relates to tractors faired cables used on a ship to tow a submersible body dumped at sea and the handling of these cables. It relates more particularly cables tractor careened through hulls hinged together.

The context of the invention is that of a naval vessel or vessel to tow a submersible object such as an integrated variable depth sonar in the towed body. In this context, non-operational phase of the submersible body is stored on board the ship and the cable is wound around the drum of a winch for winding and unwinding the cable, that is to say to deploy and retrieve the cable. Conversely in the operational phase, the submersible body is immersed behind the ship and towed by the latter by means of the cable, the end connected to the submersible body is immersed. In other words, during the operational phase, the cable is deployed, it is towed by the vessel and has an immersion end. The cable is wound by the winch through a guide device for guiding the cable. The guide device serves to limit the lateral deviation of the cable. It conventionally comprises a pulley.

For a strong immersion significant towing speeds, the tow rope is streamlined thereby reduce hydrodynamic drag in very high proportions. Figure 1A shows a portion of the cable 1 extending along an x-axis. This cable is ducted, it is coated with keels having shapes to reduce hydrodynamic drag. The hulls form a fairing fairing also called column. The hulls are rigid. In other words, they do not deform under the effect of hydrodynamic flow. The cable 1 is typically shrouded by a cowling or fairing column 3 comprising a sequence of two hulls or keels. Each hull 2 ​​comprises an elongated member having a hydrodynamic profile. The hydrodynamic profile is the shape of a section of the fairing section in a plane perpendicular to the axis x. The hydrodynamic profile hulls is, for example, as shown in FIG 1B, wing-shaped having a thick inner edge (or leading edge BA) accommodating a tubular channel through which the cable 1 and a thin outer edge (or trailing edge TE) for a less turbulent flow of water around the cable. The hydrodynamic profile has such a form of drop of water or a NACA is to say, a profile defined by the NACA which is an acronym of the English expression "National Advisory Committee for Aeronautics." All keels completely covers or partially the cable. The hulls are immobilized in translation relative to the cable along the x axis.

In normal operating condition, the hulls are rotatably mounted around the cable, that is to say about the axis x. Each hull is however linked to its two neighbors so as to be pivotable relative thereto about an axis parallel to the axis x of a small maximum angle of the order of a few degrees. It is indeed necessary that the hulls can rotate freely around the cable to be properly oriented in different phases since it is not possible to control the orientation of the cable itself, these phases are: the following guidance the water flow, the direction to move the pulleys, the spooling of the guide device and the storage on the reel. As a result, the rotation of a scale causes a rotation of neighboring keels and step by step than all keels. Therefore, both when the cable is deployed in the water when it is wrapped around the drum while changing the orientation of one of the keel, affects step by step all the hulls careening cable. Thus, when the cable is deployed at sea the hull is naturally oriented in the direction of the current generated by the building movement. Similarly during winding of the cable around the winch drum, all the hulls adopt over of lift cable same orientation relative to the drum, an orientation that allows to wind the cable by maintaining the parallel keels a to others in turn.

The Applicant has found that, when coming wrap the cable around the reel in order to recover the towed body, it occasionally happens that the fairing is highly deteriorated see crushed at the time of its passage through the guide devices, which can make unavailable any sonar system. It may even happen that this deteriorates the guide device. For example, some variable depth sonar systems installed on some ships and operated so

normal by military crews encounter hulls grinding problems about once a year and sometimes more often. This leads to system downtime, which can range from several hours to several months, during which maintenance operations are to be conducted.

The object of the present invention is to provide a method for handling cable which allows to limit the risks of deterioration of the fairing of a towed cable in order to limit the risks of immobilization of the sonar system.

To this end, the applicant first of all, in the context of the present invention, identified and studied the cause of the hull grinding problem by watching cable shrouded in operational status and by modeling the cable streamlined operational situation different forces acting on it, including hydrodynamic and aerodynamic flow as well as gravity.

During the operational phase, the ducted cable is towed by the vessel and has an immersion end. Very often, the towing point is a point on a pulley that is located at a height above the water. By towing point means the position of the fulcrum of the cable to an onboard device on board the ship, which is the closest to the immersed end of the cable. When the ship ahead, under the action of the drag, the cable away from the transom to disappear under the water a little further than the vertical towing point. The cable length shrouded in air situation is increased compared to the single towing height above water because the cable is inclined relative to the vertical. It is observed that the last hull which is still in engagement with the vessel, that is to say the hull which is towing point, often supported on the pulley or supported on a guide device on board the vessel , is oriented correctly in the direction of flow although it is well above in air (leading edge facing the flow and the trailing edge behind. the first hull in the water (i.e. -to say just the submerged hull) is supposed to make a correct orientation in the flow from vessel speed (leading edge facing the flow and trailing edge trolling). But between these two remarkable hulls, column fairing may twist as it is in the air, just vibrated, an insignificant airflow and gravity. As a result of requests from the sea, towing conditions and waves, torsion situations of this air column are regularly observed. The first cau if torsion is caused by gravity as soon as the cable is moved away from the vertical, which necessarily happens to him as soon as the towing speed is sufficient. Under the effect of gravity, the fairing column between the towing point and the sea will twist to one side (in air) and will recover (in water). This is the nominal position of the fairing column. This twisting is a function of the intrinsic stiffness of the column shroud but also air length. A situation in which the aerial part of the fairing 2 is slightly twisted, that is to say in torsion about the x axis) is shown in Figure 2A. In Figure 2A, the vertical direction in the terrestrial reference frame is represented by the z axis and shows the orientation of the section of certain keels in zones A, B and C enclosed by dashed lines. In the situation shown in Figure 2A, the last hull 3 in engagement with the vessel is vertically oriented (trailing edge up) as is shown in zone A. The hulls which lie in the air between the pulley P and the water surface S are laid under the effect of gravity. In other words, as shown in the area B, the trailing edge of the keel is oriented downwardly (between the pulley P and the surface S of the water, hulls revolved around the cable). However, hulls which lie in the water are adjusted under the action of the flow of water acting as the FO arrow as shown in the area C (trailing edge and leading located at approximately the same depth).

It happens from time to time, according to the sea conditions, water packets or breaking waves fall down more or less towards the transom of the vessel by creating then in the aerial part of the cable a momentary reverse flow of the prevailing low and matches the speed of the vessel forward. These bodies are fully capable of further twisting of the shroud advantage column and place it in opposition to the intended position in the normal flow of tow. In this case, the shroud is twisted and carries, in its aerial part, a half-turn around the cable. This means that two hulls of the game

Aerial the fairing column have trailing edges forming between them an angle of 180 degrees around the cable. The portion of the fairing located between these two surfaces is twisted or torsionally. From this, it can happen that these parts of fairings are therefore upside down from the average flow given by the speed of the vessel are then suddenly bathed again in this way flows (due to movement ship, the waves etc.) the fairing part upside is asked to come back in the right direction (related to normal medium flow). It can then:

- annul its turn and return to its initial position by describing the reverse rotation of that which had brought backwards. It is then correctly oriented.

- or add to the existing turn another half turn which bring it to the correct orientation in the flow but which has the effect of twist of 1 turn (or 360 °) the aerial part of the fairing above it and twisting in the same way a portion below it of a turn (or 360 ° but this time in the other direction). The party was initially upside returned to the positive trend in the average flow from vessel speed but it is produced two twists of a turn one over in the air and other below in water. One speaks of complete twist of the shroud (which may be translated by twist in English terminology). This full twist is a stable situation of the fairing or cowling column 2. It is shown in Figure 2B. This situation can be described as follows: R between the towing point and the water surface S, the fairing column completes one revolution in the direction of F1 around the cable arrow. The fairing of column 2 passes through the surface S and remains properly oriented over a length L1 in the order of a few meters or less sometimes. Then the fairing column 2 performs one complete turn in the water, in opposite direction, represented by arrow F2 back to the correct orientation in the stream. In other words, the shroud undergoes a complete double twisting around the cable. The double torsion comprises an aerial complete twist TA, located above the water surface and submerged complete twist Tl, located below the water surface. All that portion of the fairing located below this double twist

full is not at all affected by what happens over her (its hulls are correctly oriented in the flow).

The configuration in which the fairing undergoes a double torsion is stable but strongly degraded and it might greatly to bring subsequently large disturbances on the overall system.

We have discovered that it is when a fairing undergoes a double full twist that, under certain conditions, the fairing will be greatly deteriorated in the water and the damaged part will cause great damage to the whole system shrouded in winding the cable more precisely when it passes through the cable guide device. Specifically, the damage will mainly consist of bonds breaks between adjacent hulls.

By analyzing the double full twist, the applicant has found that the submerged twist can be seen as "hooked" on the cable. In other words, the torsion immersed position is fixed relative to the cable along the cable axis. However, its air exchange, the air twist remains in the same location between the towing point R and the water surface S. It is not fixed relative to the cable as the cable axis but fixed relative to the surface S of the water or at the towing point. When the cable is hoisted or lowered, the hulls immersed undergoing torsion follow the movement of the cable which is raised or lowered while the air twist remains fixed relative to the surface of the water. It follows that unwinding of the cable plunged torsion immersed to a greater depth so that the air twist remains in the same place relative to the water surface (2 twists then away the from each other). 2C shows a situation in which the cable has been unwound with respect to the situation of Figure 2B (see arrow). The distance L2 represents the distance between the relevant part of the fairing by the submerged torsion and the fairing in the water entry point is greater than the distance L1 representing the same distance in the situation of Figure 2B. Conversely a hoisting cable, with respect to the situation of Figure 2B, according to the arrow shown in Figure 2D, will move the torsion immersed while air torsion remains in the same place relative to the surface water (both twists then approach each other).

We must then look at what happens to a twist of a submerged tower and towed as well. This twist is activated at a low height requires fairings to navigate backwards or across the stream. The action of flow on these surfaces is then very high (proportional to the area, angle, the water density and the square of the speed). This action results in powerful torques which tend to force the hulls to align in the flow but they face the stiffness of the tower twist which then increases. It happens when a balance occurs and the twist of a tower is terribly reduced in height and fascia undergoes violent efforts that result, we have seen, by very high deformations. The formation of a double twisting may lead to deterioration of the submerged torsion. Indeed, when a double torsion is formed, it will shrink under the effect of the towing speed. In other words, the complete tour of the fairing around the cable will be on a distance becoming shorter. Sea Observations have shown that the fairing column could complete one revolution around the cable over a length of 50 cm. The hydrodynamic flow exerts a very important couple on the misguided hulls. The exposure time of the fairing to the immersed and towed torsion will cause gradually permanently deformed (or very long to be absorbed) making for a fairly long time totally unfit to engage in the cable guide device well that continuity is not broken. Another effect of this very important hydrodynamic torque is simply permanently break the continuity of the fairing column. Side air twist there is no damage, there is indeed a twist applied but at no time it can damage the cable.

However, if the exposure time to the towing flux of a submerged torsion is low or if the towing speed is low, the torsion will not keep memory of its deformation. It will then pass the following effect if we were to raise the cable: The submerged twist goes back along the cable, it would reach the surface and meet the air twist and at that time the two would cancel twists and disappear together. But this would not be the case if the violent distortion of submerged twist were to persist.

The Applicant has therefore found that in the case of the rise of an underwater twist that was not resolved because being old, the fairing was extensively and heavily constrained, he kept the memory of its deformation and immersed twist out of the water yet very narrow during hoisting and does not disappear when hauling. When the torsion immersed still very narrow is then presented to the guiding device, for example the pulley, the hulls affected by this submerged torsion can not be placed properly in the pulley of the fact that the pulley limits the lateral deflection but also the fact that generally the pulley has a throat for holding the keel leading edge upward to facilitate the winding of the cable without damage on the winch. It acts as a shaper). The hulls move in a direction other than that shown in Figure 2a in the pulley, they are going to go backwards in the pulley, get stuck, and it is all the fairing column that comes after the part of the fairing concerned by the ancient submerged twist that is methodically destroyed if we continued hauling because step by step, each hull follows the orientation of the one preceding it.

The invention provides a cable handling process which is based on the study of the double twist phenomenon that limits the damage to the cable fairing risks.

To this end, the invention relates to a method for handling a cable ducted by means of a fairing, said cable being towed by a ship in which is embedded a winch for winding and unwinding the cable faired through a cable guide device ducted, the method comprising:

- a first cable monitoring step for detecting whether the fairing undergoes a double twisting around the cable comprising a submerged complete twist and an air complete twist,

- and, when a double torsion is detected, a first step of hoisting cable ducted during which hoists the ducted cable, the first step of lifting is implemented so that the complete twist so immersed at least partially of water and do not penetrate into the guide device.

Advantageously, the method comprises at least one of the following features taken alone or in combination:

- the first step of lifting comprises a step of lifting the cable at which lifts the point of the towing cable by means of a lifting device on board the ship,

- when the double torsion is not absorbed at the end of the lifting step, the method comprises a wire winding step by means of an on-board winch on board the vessel,

- the first stage of monitoring is implemented permanently or is repeated at intervals of less than a threshold duration DS at most 10 minutes

- a duration separating the detection of the double-twist and the beginning of the first cable hoisting step, the sum of the threshold duration ds and the duration separating the implementation of the first step of monitoring at the time of detection and the previous implementation of the first step of monitoring is at most equal to 15 minutes,

- hoisting the first step is implemented at least until absorption of the double-twist detected,

- the method comprises a first step of monitoring to detect a double-twist fairing implemented before each second hoisting step in which is wound by means of the winch, the cable having a length L greater than or equal to the sum 1 meter and altitude between the towing point of the surface of the water,

- the first lifting step is carried out at least partially by means of a nominal speed hoist winch, the method comprising, when the double torsion is not absorbed during the first stage of lifting, and if the winding of the cable the length L involves crossing of the guide device by the submerged torsion, a third cable hoisting step in which the submerged torsion belonging to the double-twist detected through the guide device, the third step of lifting being implemented means of the winch at a hoisting speed lower than the nominal speed,

the third lifting step is manually or mechanically assisted so as to correctly position the shroud into the guide device,

one stops the hoisting cable at the end of the first step of lifting until the double torsion is absorbed,

when the double torsion is absorbed during the first stage of lifting, the first lifting step is followed by a final haul step carried out by means of the winch to the rated speed of winch until the cable length wound by means winch reaches the length L,

the method comprises, when no double torsion is detected during the first monitoring step, a second step of the hoisting cable of a length L, produced by means of a winch at the nominal speed of the winch,

the method comprises a second step of monitoring implemented during stage hoisting and for detecting the absorption of the double-twist and monitoring the position of one complete twist immersed relatively to the guide device,

the method comprises fourth steps hoisting cable which is wound on the respective cable lengths less than the sum of 1 meter and altitude between the towing point of the surface of the water, the hoisting fourth steps being implemented at greater than or equal respective time intervals to 20 minutes at least for a predefined period, the cable not being held between two consecutive work put in the fourth step,

the method comprises a fifth step of winding hoisting cable of a length less than the sum of 1 meter and altitude between the towing point of the water surface in the length for at least one step of wire unwinding,

the first step of lifting is carried out by means of a lifting device, said lifting device being automatically activated when the monitoring device detects a double twist.

The invention also relates to a handling device of a cable ducted by means of a fairing towed by a vessel, said apparatus comprising a monitoring device for detecting whether the fairing undergoes a double twisting around the cable comprising a torsion complete immersion and air complete twist and a hoisting device for hoisting the cable when a double torsion is detected so that the complete twist so immersed at least partially water and does not penetrate into the guide device.

Advantageously, the device comprises an activation device for activating the lifting by the lifting device and control means for controlling the hoisting of the cable so that the complete twist so immersed at least partially water and not penetrate into the guide device.

Advantageously, the device comprises a warning device for alerting a when a double torsion is detected operator.

The invention also relates to a handling device configured to implement the method according to the invention, the monitoring device being configured to detect whether the fairing undergoes a double twisting around the cable comprising a submerged complete twist and a complete twist air and the hoisting device being configured to implement the first stage of lifting when a double torsion is detected by the monitoring device.

Advantageously, the handling device includes an actuator configured to activate the hoisting cable by means of the hoisting device when a double torsion is detected by the monitoring device and a controller for controlling the hoisting cable by means of the hoisting device so that the complete twist so immersed at least partially water and does not penetrate into the guide device.

Other features and advantages of the invention will become apparent from reading the following detailed description, given by way of example and with reference to the accompanying drawings in which:

- Figure 1A already described, represents a portion of cable ducted, Figure 1 B shows an example already described section of a hull of a shroud in a plane M perpendicular to the cable axis and shown in Figure 1 AT,

- Figure 2A already described represents a streamlined towed cable partially immersed since the submerged portion to a guide pulley in a situation in which the cable does not undergo double-twist, Figure 2B shows the cable of Figure 2A in even immersion state (that is to say the winding and unwinding) as in Figure 2A but undergoing double-twist; 2C shows the cable of Figure 2A with the double-twist of Figure 2B in a configuration in which the cable has been unwound with respect to Figure 2B; Figure 2D shows the cable of Figure 2A with the double-twist of Figure 2B in a configuration in which the cable has been raised with respect to Figure 2B,

- Figure 3 shows a ship towing a towed object by means of a traction cable,

- Figure 4 shows a block diagram of steps of an exemplary method according to a first embodiment,

- Figure 5 shows a block diagram of steps of an example method according to a second embodiment.

From one figure to another, the same elements are identified by the same references.

The invention relates to a method for handling a 1 faired cable towed by a naval vessel, such as a ship, to protect the cable fairing.

In Figure 3, there is shown a cable 1 which may be a traction cable or electric drag towed by a vessel 100. The cable 1 is towed or pulled by a vessel. It is at least partially submerged. The cable comprises a fairing 3 comprising at least one fairing section including a plurality of hull 2. The hull of the same section of

shroud are connected together axially, that is to say along the towline. They are pivotally mounted around the cable and are articulated together by means of a coupling device so that the relative rotation of said hull 2 ​​from each other around the cable 1 to be authorized. This movement is allowed to be freely to a stop. The rotation of a hull around the cable does not then drives the adjacent hull rotation. The deflection can be obtained in manner constraint with a point more or less strong towards the aligned position (no hulls of relative rotation with respect to each other around the cable). In the latter case, rotation of a hull around the cable rotated adjacent hulls of the same length around the cable. In the case where the cowling comprises a plurality of sections, the sections are free to rotate one with respect to the other around the cable. Conventionally, the hulls of a fairing section are connected in pairs by individual coupling devices. Each coupling device for connecting a fairing to an adjacent keel of the same shroud portion only.

The cable tows a towed body 101, comprising for example one or more sonar antennas. The towed body 101 is mechanically secured to the cable 1 appropriately. Up in water and the water outlet towed body 101 is performed by means of a winch 5 disposed on a deck 103 of the vessel 100. The winch 5 comprises a not shown drum sized to permit winding of cable 1. The towed cable 1 can be wound around the winch 5 through a guide device 4, as described above, for guiding the cable. The cable guide device further allows conventionally but not necessarily direct the hulls with respect to the winch drum. It also allows classically secure the bending radius of the cable so that it does not fall below a certain threshold. In the nonlimiting example shown in FIG 3, the guide device is a pulley 4. It may, for example, comprise, in place of or in addition to the pulley, at least one guide or guide means for limit lateral movement of the cable as a deflector, a turner keels, a fairlead for securing the cable radius of curvature so that it does not fall below a certain threshold and / or a spooling device to properly store the cable on the drum.

In the embodiment of Figure 3, a lifting device 6 is on board the ship 100 for raising and lowering the towing point. It comprises, on the non-limiting example shown in Figure 3, an articulated structure 7, for example an arm, to which is fixed the pulley 4. The articulated structure 7 is pivotable about an axis perpendicular to the plane of the FIG substantially parallel to the deck, that is to say a substantially horizontal axis when the vessel is in equilibrium, so as to pass from a low position as shown in solid lines in FIG 3, wherein the pulley (or more generally the towing point) in a low position to a high position (shown in dashed lines in Figure 3) wherein the pulley (or more generally the cable towing point) is at a second elevation greater than the first altitude at which the pulley (or more generally the cable towing point) is in the lower position relative to the deck of the ship or relative to the surface of the water. Therefore, when the articulated structure moves from its upper position to its lower position, this amounts to hoist the rope or lift towing point so as to release a length I of water cable without feeding the cable direction of the guide device. All other lifting device could be used to lift the cable towing point. Advantageously, the handling device is configured to enable to out of the water a cable length between 1 m and 2 m.

The invention aims to reduce the risk that a part of the fairing undergoing complete twist immersed penetrates into the cable guide device.

To this end, the cable handling process 1 according to the invention comprises a first fairing one monitoring step for detecting whether the fairing 2 undergoes a double torsion comprising a submerged complete twist and an air complete twist, and when a double torsion of the fairing 2 is detected, a first lifting step of the cable 1 comprising the hoisting cable 1, the first monitoring step and the first step of lifting is implemented so that the torsion

so immersed at least partially water and does not penetrate into the guide device.

To understand the effects of the method according to the invention, it is appropriate to describe the effects of the first lifting step of consecutive cable to the detection of a double-twist. It was seen that the submerged torsion remains "attached to the cable," that is to say the part of the fairing undergoing immersed complete twist or being immersed occupies a fixed position relative to the cable along the axis cable. Therefore, by raising the part of the cable undergoing the torsion submerged (that is to say the hulls immersed undergoing twisting) will therefore gradually rise to the surface, regardless of its immersion. When immersed twist arrives above the water surface, the Applicant has found, in studying the phenomenon of double twist, he can pass the following two things.

First, if the double-twist is new, that is to say it is formed from more than 15 minutes, the torsional tightening of shroud column is instantaneously reversible. In this case, when the first cable hoisting step, when the first hull misguided due to underwater twist start coming out of the water, or at worst when half of the affected part of the fairing by twisting is immersed from the water, the double torsion is destabilized and she suddenly defeated simultaneously with the air twist. The shroud is then released from the double twist and regains its nominal state and the system may again be operated nominally and, in particular, it is possible to again immersing the rope portion which was affected by the torsion submerged or come wrap it around the winch drum without the guiding device is damaged.

- Second, if the double-twist is old, that is to say it is formed for more than 15 minutes, when the first hoisting cable step, the double-twist of the fairing does not occur naturally loose ( or she may not discard). While the double twist is old, it has tightened. It follows that even if the release of the hydrodynamic force, the double twist will not unravel. She will eventually but after some time and after the possible viscoelastic relaxation phenomena. Therefore, if hoisted too the cable, the non-volatile immersed complete twist will be introduced to the tow cable pulley or of the guidance system to the towing point. In other words, the part of the cable was immersed at the time of detection of the double-twist and around which the fairing suffered and still undergoes a complete twist back and will penetrate into the guide device. The first step of lifting is performed so that the portion of the fairing undergoing complete twist immersed at the time of detection of the double-twist does not penetrate into the guide device. Therefore, the method according to the invention, when implemented, is to fill a double-twist or, when it is not resorbed, to avoid a torsion immersed enters the device guide. The method of the invention limits the risk of deterioration of the fairing due to the appearance of double twists. The method according to the invention does not require modification of the device for winding and unwinding the cable (winch and guide device). The method according to the invention is particularly advantageous when the guide device is too narrow for the hulls which are not oriented trailing edge upwards when they come to the guide device, can turn by pivoting around the axis of the cable, to reach that position. In other words, the guide device acts as shaping.

We will now describe an example of a first embodiment of the method according to the invention with reference to Figure 4. In this embodiment, the first monitoring step 10 is carried out permanently or at least for common the cable towing. In other words, the step of monitoring is implemented permanently or by an automatic system or by observation by a crew member. In other words, the time between two successive implemented or achievements of the lower step of monitoring or equal to 10 minutes and preferably less than or equal to 5 minutes. By tow cable 1 means a situation in which the cable includes a submerged end and in which the ship ahead of the water. Although there are more or less favorable conditions for

the appearance of double twisting, there is no known predict when a double-twist may appear. Permanent or frequent monitoring of double twists then ensures that when a double torsion is detected, it is recent. Therefore, a double torsion is detected automatically resolved when the hoist cable of sufficient length, i.e. at the outlet of water from the submerged torsion at worst when about half of the torsion is immersed from the water. Moreover, the Applicant has found that the submerged torsion is formed close to the surface in 1 or 2 meters from the surface. The submerged torsion remains at this depth that the cable has not been conducted after the formation of the submerged torsion.

When a double torsion is detected, it implements a first step hoisting cable 1 1 1 consisting of the hoisting cable. Advantageously, the first hoisting 1 1 There step is carried out until absorption of the double-twist or, more generally, at least until resorption of the air twist. The method according to the invention, without modification of the trailer coupling, to reflect the appearance of the twists to absorb without risking to reach the grinding fairings. This process ensures the disappearance of grinding a part of the fairing column due to the formation of a double twist.

The duration separating the start of the first step of lifting and detecting the double-twist is less than or equal to a threshold duration ds. The threshold length ds is such that the sum of the threshold duration ds and the duration separating the implementation of the first step of monitoring at the time of the previous detection and the implementation of the first step of monitoring is at most equal to 15 minutes and preferably at most equal to 10 minutes. The time between the implementation of the first stage of monitoring at the time of detection and the previous implementation of the first stage of monitoring is zero when the first stage of monitoring is implemented permanently. In practice, the duration ds is between 5 and 10 minutes. This ensures that the double-twist is always up when the implement is put the first step hoisting 1 1, that is to say it will disappear when hauling before the immersion torsion enters in the guide device. This method reduces the chances of grinding a part of the fairing of column due to the formation of a double twist. It keeps the system without interruption in operational condition.

The first hoisting 1 1 There step 12 comprises a lifting step of lifting the tow point of the cable so as to bring the towing point to an altitude higher than the altitude it occupied at the time of detection of the double torsion by means of a lifting device. The lifting device is for example the lifting device shown in Figure 1, in this case, pivots the articulated structure from a low position to a high position in which the towing cable point altitude is greater than the elevation of the cable towing point in the situation where the lifting device is in its low position. The stroke of the cable tow point 12 at the lifting stage is fixed, it between 1 and 2 m. It ensures resorption submerged twists extending the run of the lifting device. The advantage of the lifting operation is to operate by a simple maneuver the hoisting cable by winding the cable using the winch, and above all, absolutely no risk of damaging the fairing in case of double twist old because the cable is not progressing towards the guide device. If it is simpler and safer, however this maneuver will not be able to fill a double torsion whose submerged part is deeper than the race of the towing point between its high position and its low position.

Advantageously, the method according to the first embodiment, comprises, when the double torsion is not absorbed at the end of step 12 of lifting a winding step 13 of winding the cable 1 by means of winch 5 to resorption of the double-twist. This step is performed when the lifting device is raised.

Alternatively, the first step hoisting 1 1 comprises only the wire winding step, for example, when there is no lifting device. Alternatively, the first step of lifting comprises only the step of lifting.

The first step hoisting 1 is 1 may be constructed so as to wind the cable of a predetermined length less than or equal to the elevation of the towing point in calm sea state (that is to say when the axis the vessel is substantially horizontal in a terrestrial reference frame) plus 1 m. This is the minimum length of cable between the cable entry point of the towing point in the water. This feature ensures that a double torsion located just below the water surface does not enter the guide device. In the latter case and in the case where the hoisting step comprises the step of lifting, the stroke of the lifting device is fixed, the cable is advantageously prohibits unwinding once the double torsion is detected which limits the risk of increasing the depth of the submerged torsion.

In the example shown in Figure 4, the method includes, for example but not necessarily, after the first step hoisting 1 1 a deployment step 15 consisting deploy the cable. This step is to reset the towing point in the lower position by means of the lifting device. Alternatively the deployment step 15 is put the cable in the deployment state in which it was before the first stage of lifting. In this case, it further comprises a wire unwinding step.

In the example shown in Figure 4, the method 14 comprises a second monitoring step for detecting the absorption of twist. This step should actually be able to detect the absorption of the air twist. This step is here implemented continuously during the first stage of lifting. Alternatively, it could be implemented at regular time intervals or only after lifting step and at regular time intervals or continuously during the cable winding step.

Alternatively, the method according to the first embodiment does not include this second fairing step of monitoring. It is for example not necessary when the first stage comprises only hoisting the lifting step as the hoisting of the lifting cable can lift towing point without bringing the submerged torsion of the guiding device.

The process according to the first embodiment prevents the passage of double twists in the guiding device (that is to say before a large hoisting cable) and prevents deterioration of the fairing related tightening torsion immersed time. However, it has the disadvantage of requiring continuous or frequent monitoring of the shroud resulting in a significant mobilization of the crew or requires a monitor that has a very good reliability to avoid false alarms related to false detections complete twist and therefore unnecessary hissages.

We shall now describe, in reference to Figure 5, an example of a second embodiment of the invention that does not require a constant or frequent monitoring of the fairing or allows a less reliable monitoring device as in the first embodiment. In this second embodiment, the first monitoring step can be carried out episodic or randomly during towing or be formed in certain predetermined situations only during towing.

In this case, in the process according to the invention, it is assumed that when it is desired to maneuver the cable 1, it is not known if the fairing is assigned a double twist. However, we have seen that it is the hoisting cable 1, more particularly the winding of the cable around the winch, which can lead to crushing of the fairing during the passage of the immersed part of the cable in the cable guide device . Therefore, to prevent this from happening, the method according to the second embodiment includes a first stage shroud 20 monitoring for detecting a double-twist fairing performed before each second hoisting cable of a step length L greater than or equal to a threshold length L equal to the height of the tow point relative to the water surface over a meter. The first step 20 of monitoring the cable follows a towing step 19 in which the winch 5 blocks the winding / unwinding of the cable. It is for example implemented after receiving a cable winding around a

length L. When a double torsion is detected, the second step of lifting comprises a first step 21 the hoisting cable.

The method advantageously comprises a second monitoring step 22 during the first stage 21 of hoisting. The second monitoring step 22 to detect if the double torsion is absorbed, for example by detecting whether the air torsion is absorbed, and monitor the position of the relatively immersed twist to the guide device. When the double torsion is absorbed during the first stage hoisting 21, the first lifting step is followed by a final haul step 24, within the second stage of hoisting, of winding the cable by means of the winch up to that the cable reaches the hoisted length L. the cable winding length can be continuous between the first step of lifting and hoisting final step 24. It is advantageously carried out at the same speed.

When the double torsion is not absorbed during the first stage hoisting 21, and when the length L is such that it involves the crossing of the guide device by the complete twist immersed, the second step hoisting advantageously comprises a third step of the hoisting cable 23 of continuing the first step of hoisting during the crossing of the guide device by the submerged torsion. The cable is not unwound, between the first step of lifting and hoisting final step or between the third step of lifting and hoisting final step.

In the embodiment of Figure 5, the first step 21 comprises a hoisting winding step performed by means of a winch. It is advantageously carried out at the rated speed of winch operation. This nominal velocity is typically between 0.2 m / s and 1, 0 m / s.

When the double twist does not go away during the first stage hoisting 21, must then absolutely slow maximum speed hoisting and it is best to check carefully that each hull is recovering well and engages correctly in the guides. To this end, the first lifting step is carried out at rated speed and, for example, once the twist is immersed completely out of the water and before it enters the guide device, or when the submerged torsion partially out of the water, begins the third stage of lifting a hoisting speed below the rated speed. This third lifting step may be assisted manually or mechanically so as to help the torsion submerged to position themselves correctly in the guiding device for the guide device acts as a shaper.

For example, the winding cable is continuous between the first and the third step but the speed of hoisting hoisting used during the third step of lifting is less than the hoisting speed used during the first stage of lifting. The third lifting step is for example carried out at a speed at least two times lower than that at which is performed the first stage of lifting. The interest in achieving this low speed step is to reduce the risk of deterioration of the shroud during its passage in the guide device.

This can be done in the same way when the submerged hulls undergoing twist deteriorated. The interest is to avoid additional damage at the time of passage of the torsion immersed in the guide device. When there are breaks between connecting keels, the first hull upstream rupture view of the winch will be in the guide device with the trailing edge facing downwards due to gravity and if the device guidance is too narrow or if the hoist is too fast, the hull will not be able to move only trailing edge upward. However, as the cable based on the trailing edge when the hull is supported on the guide device, the jammed hull in the pulley will be crushed and damaged which will cause deterioration of all the following keels. The reduced speed used during the third step of lifting and mechanical assistance or manually are very advantageous in this case.

Alternatively, if the part of the fairing undergoing immersed torsion deteriorated (bent or broken hulls or rupture of the connection between hulls) at the end of the first stage of lifting, the method may comprise a shroud repair step before implementation of the third stage.

When the double torsion is not absorbed during the first step of lifting is advantageously stops the hoisting cable until the double torsion is absorbed due to the viscoelastic effect before implementing the final hoisting step 24. the part of the cable submerged undergoing torsion can be manually collected and deposited on the bridge between these steps to promote the resorption of the double twist. After this wait, the system returns to its nominal state and can again be operated nominally. The load-lifting step is to resume the winding of the cable where it stopped in the first step of lifting up the coil length L. The double twist being resorbed and the hulls in good condition, the step of final lifting 24 can be carried out at the rated speed of winch.

Alternatively, as in the first embodiment, the first step of lifting may comprise a lifting step. For this purpose, the first step hoisting begins with a first lifting step and if the double torsion is not absorbed at the end of the lifting step, a wire winding step. The method then comprises a step of deploying the end of the first step of lifting or hoisting the third step. Alternatively, the first step of lifting comprises only one winding step.

Advantageously, when no double torsion is detected during the first monitoring step 20, the monitoring step is followed by the second step of lifting 25 which may, for example be performed unattended and continuously at the speed rated winch.

Advantageously but not necessarily, the method comprises, during the cable towing fourth steps hoisting cable 26 upon which is wound the respective lengths of cable below the threshold length Ls implemented at time intervals at least equal to 20 minutes. In other words, the respective time intervals separating two successive fourth steps hoisting greater than or equal to 20 minutes. The cable is not unwound between two fourth steps of

consecutive hissages. Fourth steps hoisting allow out any torsion submerged water blind (that is to say without mobilization of the crew to make possible monitoring). Furthermore, as the fourth row hoisting steps are separated by at least 20 minutes, if the double twisting is out of the water, even if it is a double-remanent twist (that is, say that was not absorbed in its out of the water), it will have time to be absorbed before the next step hoisting and will not penetrate into the guide device. These fourth steps hoisting therefore possible to reduce the possible double twisting that may have formed on the surface and reduce the risk of detection of a double torsion at the time of lifting before monitoring step the cable of a length greater than the length at least equal, that is to say greater than or equal to the threshold length Ls and therefore to limit the probability of having to implement the twists double resorption procedure already described with reference to FIG 5. the fourth hoisting steps are advantageously carried out at regular time intervals (that is to say that two steps of successive hissages are separated from the same time interval). Advantageously, the cable-winding lengths are the same for all the fourth steps. Alternatively, the time intervals and the winding lengths are different from a fourth stage to another.

Advantageously, the method comprises, before at least a 28 wire unwinding step, while the cable is partially submerged, a fifth step of hoisting 27, at which is wound the cable of a hoisting length less than the length threshold ls. This step helps reduce double recent twists and limits the risk of developing old double twists. Just like the previous step, it limits the risk of twisting double detection at the first stage of monitoring.

The fourth hoisting steps are implemented to respective time intervals at least equal to 20 minutes for at least a predefined period taken from a first period and at least one second period. The first period is a period extending from the beginning of the tow 19 to the first monitoring step. A second period is a period between the end of a second step of lifting and the beginning of the first consecutive monitoring step in said second step hoisting.

The fifth lifting step is carried out before an unwinding step implemented at least for at least one further predefined period taken from a first period and at least one second period. Advantageously, the fifth step is implemented before each course of step taking place during at least one further predefined period taken from a first period and at least one second period.

In both embodiments, the first lifting step is carried out after detection of a double-twist. The method is devoid of wire unwinding step from when the double-twist is detected and the implementation of the first stage of lifting.

The steps of monitoring for a double twist to detect the reversal of a double-twist and to monitor the distance between the submerged torsion of the guide device can be performed by visual inspection by the crew. Indeed, the air twist is always visible to the crew of the vessel and the position of the torsion submerged relative to the guide device when the latter comes out of the water. It is effective but dependent on the attention of an operator. The main drawback lies in the immobilization of an operator who has to move back beach and sometimes in difficult sea conditions, and conditions of visions that can be highly degraded

Alternatively, at least one monitoring step is performed by a monitoring device. This is particularly advantageous in the case of the first embodiment or a permanent or frequent monitoring is required and this will reduce double recent twists and avoid the consequences of old double twists.

The invention also relates to a handling device of a streamlined cable towed by a ship. The device is adapted to implement the method according to the invention. The device comprises a monitoring device for detecting whether the fairing undergoes a double twisting around the cable comprising a submerged complete twist and an overhead full twist.

The handling device further comprises a hoisting device for implementing the first stage of lifting. In other words, the hoisting device for hoisting the cable when a double torsion is detected so that the complete twist so immersed at least partially water and does not penetrate into the guide device.

Preferably, the monitoring device is configured to implement the step or steps of monitoring and in particular the first step of monitoring.

The monitoring device comprises for example an image sensor installed so as to capture images of recursively cable and an image processing device for detecting a double-twist on the wire. It may alternatively comprise a capacitive detector extending within the hull along the cable which is crushed and whose capacitance varies during the twisting of keels. The monitoring device comprises for example a computer receiving the detector capability and comparing it to a predetermined threshold. The double-twist is for example detected when the sensor capacity exceeds a first predetermined threshold.

The monitoring device advantageously makes it possible to detect the disappearance of a double-twist and optionally to monitor the distance between the immersed and twisting the guide device. The disappearance of the double torsion is for example detected when the sensor capacity falls below a second predetermined threshold can be, without limitation, the first threshold. Advantageously, the monitoring device is configured to detect the disappearance of a double-twist and optionally to determine the distance between the immersed and twisting the guide device.

The hoisting device comprises for example a winch and optionally a lifting device as claimed above.

Advantageously, the handling device is configured to implement the method according to the invention. The monitoring device is configured to implement the steps or monitoring

the invention. This implementation is carried out at the desired times described in this patent application (at a predetermined time interval and / or before each second lifting step of a length L greater than or equal to a predetermined length).

The handling device comprises a lifting system configured to implement the first stage of lifting when a double torsion is detected by the monitoring device. The hoisting system is advantageously configured to implement or the other steps of lifting of the invention. Steps hoisting are implemented at the desired times described in this patent application. The hoisting system comprises the lifting device and an activation device for activating or actuator, or configured to enable the first lifting step of the cable by means of the hoisting device when the double torsion is detected and means control, or controller, for controlling, or configured to control the hoisting or steps including the first step of the hoisting cable so that the complete twist so immersed at least partially water and does not penetrate into the guiding device. The control device comprises for example a control device for controlling the hoisting device so as to perform the first stage of lifting. The controller may be the actuator. For this purpose, the monitoring device is advantageously configured so as to allow to implement the second monitoring step, or configured to implement the second step of monitoring, that is to say, detecting the disappearance a double-twist and / or the water outlet of a double immersed torsion and / or to compare the position of the submerged torsion with that of the guiding device. The controller receives information from the monitoring device.

Alternatively, the handling device comprises a warning device for alerting a when a double torsion is detected operator. Advantageously, the warning device is configured to alert the operator when a double torsion is detected. The operator then activates and controls the hoist in order to implement the first stage of lifting. The second stage of monitoring is then, for example, carried out by visual inspection. The invention also relates to a cable system comprising a shrouded cable and a handling device according to the invention.

CLAIMS

1. A method for handling a ducted cable (1) by means of a shroud (2), said cable being towed by a vessel (100) on board which is embedded a winch (5) for winding and unwinding the cable ducted (1) through a guiding device (4) of the cable ducted, the method comprising:

- a first step of monitoring (10, 20) of the cable (1) for detecting if the fairing (2) undergoes a double twisting around the cable comprising a submerged complete twist and an air complete twist,

- and, when a double torsion is detected, a first step of lifting (1 1, 21) of the ducted cable (1) at which the hoisted ducted cable (1), the first step of lifting (1 1, 21 ) being implemented such that the complete twist so immersed at least partially water and does not penetrate into the guide device (4).

2. A method for handling a ducted cable (1) according to the preceding claim, wherein the first step of lifting (1 1) comprises a step (12) for lifting the cable (1) upon which lifts the point of towing (R) of the cable (1) by means of a lifting device (6) on board the vessel (100).

3. A method for handling a ducted cable (1) according to the preceding claim, wherein when the double torsion is not absorbed at the end of the lifting step (12), the method comprises a step (13 ) winding the cable (1) by means of a winch (5) on board the vessel.

4. A method for handling a ducted cable (1) according to any one of claims 1 to 3, wherein the first step of monitoring (10) is carried out permanently or is repeated at time intervals of less than a duration threshold ds at most equal to 10 minutes.

5. A method for handling a ducted cable (1) according to the preceding claim, wherein a period between the detection of the double-twist and the beginning of the first hoisting cable step, the sum of the duration threshold and ds the duration separating the implementation of the first step of monitoring at the time of the previous detection and the implementation of the first step of monitoring is at most equal to 15 minutes.

6. A method for handling a ducted cable (1) according to any one of claims 4-5, wherein the first step of lifting (1 1) is implemented at least until resorption of the double torsion detected .

7. A method for handling a cable ducted fan according to any one of claims 1 to 3, comprising a first step of monitoring (20) for detecting a double-twist fairing implemented before each second step of lifting (25; 21, 23, 24) upon which is wound, by means of the winch, the cable length L greater than or equal to the sum of 1 meter and altitude between the towing point of the water surface .

8. A method of handling a cable ducted fan according to claim 7, wherein the first step of lifting (21) is formed at least partially by means of a winch (5) to rated speed of the winch, the method comprising, when the double torsion is not absorbed during the first stage of hoisting (21), and if the winding of the cable length L involves crossing of the guide device by the submerged torsion, a third step of lifting (23) of the cable at which the submerged torsion belonging to the double torsion detected through the guide device, the third step of lifting (23) being implemented by means of a winch hoisting speed below the rated speed.

9. A method of handling a cable ducted fan according to the preceding claim, wherein the third step is assisted hoisting

manually or mechanically so as to correctly position the shroud into the guide device.

10. A method of handling a cable ducted fan according to any one of claims 7 to 8, wherein stops the hoisting cable at the end of the first step of lifting until the double torsion is absorbed.

January 1. A method of handling a cable according to any one of claims 7 to 10, wherein when the double torsion is absorbed during the first stage of lifting, the first lifting step is followed by a final haul step performed in means of the winch to the rated speed of winch until the length of the wound cable by means of the hoist reaches the length L.

12. A method of handling a cable according to claim 1, comprising, when no double torsion is detected during the first monitoring step (20), a second step of lifting (25) of the cable length L , performed by means of a winch at the nominal speed of the winch.

13. A method of handling a cable according to any one of claims 7 to 12, comprising a second step of monitoring (22) implemented in the first step of lifting (21) and for detecting the absorption of the double twisting and monitoring the position of one complete twist immersed relatively to the guide device.

14. A method of handling a cable according to any one of claims 7 to 13, comprising fourth cable hoisting steps (26) upon which is wound the respective cable lengths less than the sum of 1 meter and of altitude between the towing point of the surface of the water, the hoisting fourth steps being implemented at greater than or equal respective time intervals to 20 minutes at least for a predefined period, the cable

not being held between two consecutive set of the fourth stage work.

15. A method of handling a cable according to any one of claims 7 to 14, comprising a fifth step of lifting of winding the cable (1) with a length less than the sum of 1 meter and altitude separating the towing point of the water surface in the length for at least a wire unwinding step.

16. A method of handling a cable according to the preceding claim, wherein the first lifting step is carried out by means of a lifting device, said lifting device being automatically activated when the monitoring device detects a double twist.

17. A device for a cable handling, ducted by means of a fairing, towed by a vessel, said apparatus comprising a monitoring device for detecting whether the fairing undergoes a double twisting around the cable comprising a complete twist immersed and Aerial complete twist and a hoisting device for hoisting the cable when a double torsion is detected so that the complete twist so immersed at least partially water and does not penetrate into the guide device.

18. Apparatus for handling a cable according to the preceding claim, configured to implement the method according to any one of claims 1-1 6, the monitoring device being configured to detect whether the fairing undergoes a double twisting around the cable comprising a submerged complete twist and an overhead full twist and hoisting device being configured to implement the first stage of lifting when a double torsion is detected by the monitoring device.

19. Apparatus for handling a cable according to the preceding claim, comprising an actuator configured to activate the hoisting cable by means of the hoisting device when a double torsion is detected by the monitoring device and a controller for controlling the hoisting the cable by means of the hoisting device so that the complete twist so immersed at least partially water and does not penetrate into the guide device.

20. Apparatus for handling a cable according to claim 17, comprising a warning device for alerting a when a double torsion is detected operator.

AMENDED CLAIMS

received by the International Bureau 30 May 2016 (30/05/2016)

1. A method for handling a ducted cable (1) by means of a shroud (2), said cable being towed by a vessel (100) on board which is embedded a winch (5) for winding and unwinding the ducted cable (1) through a guiding device (4) of the cable ducted, the method comprising:

- a first step of monitoring (10, 20) of the cable (1) for detecting if the fairing (2) undergoes a double twisting around the cable comprising a submerged complete twist and an air complete twist,

- and, when a double torsion is detected, a first step of lifting (11, 21) of the ducted cable (1) at which the hoisted ducted cable (1), the first step of lifting (11, 21) being implemented so that the complete twist so immersed at least partially water-and-do-not-enter into the de-guiding device (4).

2. A method for handling a ducted cable (1) according to the preceding claim, wherein the first step of lifting (1 1) comprises a step (12) for lifting the cable (1) upon which lifts the point of towing (R) of the cable (1) by means of a lifting device (6) on board the vessel (100).

3. A method for handling a ducted cable (1) according to the preceding claim, wherein when the double torsion is not absorbed at the end of the lifting step (12), the method comprises a step (13 ) winding the cable (1) by means of a winch (5) on board the vessel.

4. A method for handling a ducted cable (1) according to any one of claims 1 to 3, wherein the first step of monitoring (10) is carried out permanently or is repeated at time intervals of less than a duration threshold ds at most equal to 10 minutes.

5. A method for handling a ducted cable (1) according to the preceding claim, wherein a period between the detection of the double-twist and the beginning of the first hoisting cable step, the sum of the duration threshold and ds the duration separating the implementation of the first step of monitoring at the time of the previous detection and the implementation of the first step of monitoring is at most equal to 15 minutes.

6. A method for handling a ducted cable (1) according to any one of claims 4-5, wherein the first step of lifting (11) is implemented at least until resorption of the double torsion detected.

7. A method for handling a cable ducted fan according to any one of claims 1 to 3, comprising a first step of monitoring (20) for detecting a double-twist fairing implemented before each second step of lifting (25; 21, 23, 24) upon which is wound, by means of the winch, the cable length L greater than or equal to the sum of 1 meter and altitude between the towing point of the water surface .

8. A method of handling a cable ducted fan according to claim 7, wherein the first step of lifting (21) is formed at least partially by means of a winch (5) to rated speed of the winch, the method comprising, when the double torsion is not absorbed during the first stage of hoisting (21), and if the winding of the cable length L involves crossing of the guide device by the submerged torsion, a third step of lifting (23) of the cable at which the submerged torsion belonging to the double torsion detected through the guide device, the third step of lifting (23) being implemented by means of a winch hoisting speed below the rated speed.

9. A method of handling a cable ducted fan according to the preceding claim, wherein the third step is assisted hoisting

manually or mechanically so as to correctly position the shroud into the guide device.

10. A method of handling a cable ducted fan according to any one of claims 7 to 8, wherein stops the hoisting cable at the end of the first step of lifting until the double torsion is absorbed.

11. A method of handling a cable according to any one of claims 7 to 10, wherein when the double torsion is absorbed during the first stage of lifting, the first lifting step is followed by a final haul step carried out using the winch to the rated speed of winch until the length of the wound cable by means of the hoist reaches the length L.

12. A method of handling a cable according to claim 1, comprising, when no double torsion is detected during the first monitoring step (20), a second step of lifting (25) of the cable length L , performed by means of a winch at the nominal speed of the winch.

13. A method of handling a cable according to any one of claims 7 to 12, comprising a second step of monitoring (22) implemented in the first step of lifting (21) and for detecting the absorption of the double twisting and monitoring the position of one complete twist immersed relatively to the guide device.

14. A method of handling a cable according to any one of claims 7 to 13, comprising fourth cable hoisting steps (26) upon which is wound the respective cable lengths less than the sum of 1 meter and of altitude between the towing point of the surface of the water, the hoisting fourth steps being implemented at greater than or equal respective time intervals to 20 minutes at least for a predefined period, the cable

not being held between two consecutive set of the fourth stage work.

15. A method of handling a cable according to any one of s claims 7 to 14, comprising a fifth step of lifting of winding the cable (1) with a length less than the sum of 1 meter and the altitude between the towing point of the water surface in the length for at least a wire unwinding step,

0 16. A method of handling a cable according to the preceding claim, wherein the first lifting step is carried out by means of a lifting device, said lifting device being automatically activated when the monitoring device detects a double-twist.

5

17. A device for a cable handling, ducted by means of a fairing, towed by a ship in which is embedded a winch (5) for winding and unwinding the ducted cable (1) through a guide means (4) of the ducted cable, said device comprising a 0 monitoring device for detecting whether the fairing undergoes a double twisting around the cable comprising a submerged complete twist and an air complete twist and a hoisting device for hoisting the cable when a double torsion is detected so that the complete twist so immersed at least partially of water and 5 does not penetrate into the guide device.

18. Apparatus for handling a cable according to the preceding claim, configured to implement the method according to any one of claims 1 to 16, the monitoring device being configured to detect whether 0 the fairing undergoes a double twisting around the cable comprising a submerged complete twist and an overhead full twist and hoisting device being configured to implement the first stage of lifting when a double torsion is detected by the monitoring device.

5

19. Apparatus for handling a cable according to the preceding claim, comprising an actuator configured to activate the hoisting cable by means of the hoisting device when a double torsion is detected by the monitoring device and a controller for controlling the hoisting the cable by means of the hoisting device so that the complete twist so immersed at least partially water and does not penetrate into the guide device.

20. Apparatus for handling a cable according to claim 17, comprising a warning device for alerting a when a double torsion is detected operator.