Abstract:
A tool ( 1 ) for the handling by a Remotely Operated Vehicle (ROV) of a protection device ( 4 ) provided to protect a subsea electrical or optical fiber connector. The main feature of a tool is that said tool ( 1 ) is attached to the ROV and comprises a ROV friendly handle ( 2 ).

Description:
RELATED APPLICATION 
       [0001]    This application claims the benefit of priority from Norwegian Patent Application No. 2011 1074, filed on Jul. 28, 2011, the entirety of which is incorporated by reference. 
       BACKGROUND 
       [0002]    1. Field of the Invention 
         [0003]    The invention relates to a tool for handling a protection device intended to protect subsea electrical or fiber optical connectors, so called dummy connectors. 
         [0004]    2. Description of Related Art 
         [0005]    Nowadays, some protection devices intended to protect subsea electrical or fiber optical connectors are equipped with a Remotely Operated Vehicle (ROV) friendly handle and hence they can be handled without any problem by a ROV, to install or to recover said protection devices. But, some  other existing protection devices are outfitted only with rope or wire instead of a ROV friendly handle, and which have the disadvantage if said rope or wire breaks. In this case, the ROV have a difficult task and may damage the protection device and the connector. 
       OBJECTS AND SUMMARY 
       [0006]    The tool according to the invention has been developed to allow the protection devices equipped only with a simple rope or wire to be easily handled by a ROV to install or to recover such protection devices on subsea electrical or optical fiber connectors. This way, a protection device with a broken rope or wire or without ROV handle does not constitute any more a problem to be installed or recovered, because it can be handled as easily as a protection device outfitted with such ROV handle. In addition, the tool can reinstall a dummy connector with the said rope or wire instead of a ROV friendly handle. 
         [0007]    The object to the invention is a tool for the handling by a Remotely Operated Vehicle (ROV) of a protection device provided to protect a subsea electrical or optical fiber connector. The main feature of a tool according to the invention is that said tool comprises a ROV friendly handle and a connection interface intended to interact with the protection device. In a general way, a handle is necessary to allow a ROV to easily handle a protection device provided to protect subsea electrical or optical fiber connector. The principle of the invention is to displace said handle from said protection device to a tool in order to attach said tool to the ROV. The connection interface is designed to attach or to disconnect the protection device. This way, a protection device equipped only with a broken rope or wire, or without handle, can also be easily handled by a ROV on which a relevant tool according to the invention is connected. A protection device is a dummy connector which is placed around the real connector to protect the electrical pins or fibers contacts from damage. This dummy connector is useful during installation until further tie-in and connection. In order to be easily and rapidly handled by a ROV, said tool must not be too cumbersome or too heavy. Moreover, the tool design must be also simple to be easily manufactured. 
         [0008]    Advantageously, the handle is composed of a plurality of tubular elements. This preferred invention embodiment is easier to manufacture. 
         [0009]    In a preferential way, all the tubular elements are arranged together so that they are aligned in a same geometrical plan. This way, the handle is not too cumbersome and may also easily be caught by the ROV. 
         [0010]    Preferentially, the connection interface shape is complementary of that of the protection device. Advantageously, the connection interface must be equipped with connection means which can easily interact with complementary connection means of said protection device. The connection interface and the protection device are intended to fit together exactly. 
         [0011]    In an advantageous way, the connection interface comprises a cylindrical body with two slots which are made to fit the type of protection device to be handled. Generally the protection device is cylinder shaped and the cylindrical body is intended to be placed all about said protection device. Said slots are dimensioned to cooperate with protection device protrusions. The connection interface is thus submitted to two successive movements: in the case of a protection device recovering, the connection interface slides linearly over the protection device, and then turns a little to lock said protection device inside said connection interface. The ROV pulls out the tool with the protection attached. In the case of a protection device installation, the protection device is attached to the connection interface, and then it is brought up to the real connector to slide over it. The connection interface turns a little to be separated from said protection device fixed on the connector. 
         [0012]    Advantageously, the two slots are diametrically opposite. 
         [0013]    In a preferential way, each slot comprises a first straight part which extends along a longitudinal direction of the body and a second curvilinear part which extends along the circumference of said body. 
         [0014]    In a preferential way, the cylindrical body comprises a spring to keep the dummy connector in position. 
         [0015]    Preferentially, an intermediate tapered part connects the handle to the cylindrical body. 
         [0016]    In an advantageous way, the cylindrical body and the tapered part are made one piece. 
         [0017]    Advantageously, the tool is made of a sea-resistant material if the tool is intended to have a long life cycle. But all materials can be used. 
         [0018]    The advantage of a tool according to the invention is that it enables fast and safe recovery of protection device with a broken wire or rope, or installation of a protection device without ROV handle. Said tool has also the advantage of being of a compact and simple design, and may also be manufactured with a not too expensive material, such as steel. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    A detailed description of one preferred embodiment of a tool according to the invention is given, referring to  FIGS. 1 to 2 . 
           [0020]      FIG. 1  is a perspective view of a tool according to the invention, also showing a protection device, 
           [0021]      FIG. 2  is a cross-sectional view of the tool of the  FIG. 1 , 
       
    
    
     DETAILED DESCRIPTION 
       [0022]    Referring to  FIGS. 1 and 2 , a tool  1  according to the invention comprises two main parts, one represented by a handle  2  and the other by a dummy connector interface  3  intended to come in contact with a protection device  4  of a subsea electrical or optical fiber connector. A protection device is composed of a dummy connector  4  which may be assimilated to a cap covering the real connector. A dummy protection connector  4  is made of a cylindrical hollow body  5  comprising two cylindrical side protrusions  6  extending in opposite directions. in other words, the two protrusions  6  are diametrically opposite and are aligned along the same radial axis. The body  5  is closed at one of its ends by a plane circular wall  7  and may comprise a rope or a wire not represented on the figures, and which is used to handle said dummy protection connector  4 . The handle  2  is composed of a plurality of tubular elements  8  which are arranged together to be aligned in the same geometrical plane in order to be easily handled by a ROV and not to be too cumbersome. More precisely, the handle  2  comprises a rectangular frame  9  made of for tubular elements  8 , said rectangular frame  9  being prolonged by two tubular elements  10 ,  11  which meet to form a terminal point  12 . The dummy connector interface  3  comprises a cylindrical hollow body  13  with two side slots  14  which are diametrically opposite. Each slot  14  is composed of a first straight part  15  which extends along a longitudinal axis of said body  13  and a second curvilinear part  16  which extends along the circumference of the body  13 . The first part  15  is achieved from an end edge of the body  13 , whereas the second part  16  is carried out inside said body  13 . The body  13  is prolonged at one of its ends by a tapered part  17  itself prolonged by the handle  2 . More precisely, the body  13  and the tapered part  17  are made one piece, and the terminal point  12  of the handle  2  is fixed to the shrunk end  18  of said tapered part  17 . A preloaded spring  19  is placed wherein the connection interface body  13 . Without any external pressure, the preloaded spring  19  lies in a predetermined position inside the body  13 , and is locked by an abutments system. This way, the preloaded spring  13  can only be compressed a little more from said predetermined position. 
         [0023]    The tool  1  according to the invention is attached to a ROV, and may be used in two different cases. The first case is concerning the installation of a dummy protection connector  4  without a handle. in this case, the tool  1  has a dummy protection connector  4  attached. The ROV installs said dummy connector  4  into the receptacle in the subsea termination. Then the ROV turn the tool  1  little to disconnect said tool  1  from the dummy connector  4 , and finally said ROV pulls out the tool  1 . The second case is concerning the recovery of the dummy connector  4  with a broken rope or wire, in this case, the connection interface body  13  slides over the dummy connector  4  in the subsea termination, so that each protrusion  6  slides along the first straight part  15  of each slot  14 . Then the ROV turns little said body  13  so that said each protrusion  6  abuts against the end of each curvilinear part  16  of said slot  14 . The spring  19  keeps the dummy connector  4  in position. Finally, the ROV pulls out the tool  1  with the dummy protection connector  4  attached. In a general way, the first straight part  15  of each slot  14  is used to compress or to release the preloaded spring  19 , and the second curvilinear part  16  is used to lock or unlock the dummy protection connector  4  inside the connection interface body  13 , in a position in which said spring  19  is a little more compressed.