EP4157710A1 - System and method for passing the cable through the shell of a floating unit and installation of portable cofferdam without diver intervention - Google Patents
System and method for passing the cable through the shell of a floating unit and installation of portable cofferdam without diver interventionInfo
- Publication number
- EP4157710A1 EP4157710A1 EP21814494.7A EP21814494A EP4157710A1 EP 4157710 A1 EP4157710 A1 EP 4157710A1 EP 21814494 A EP21814494 A EP 21814494A EP 4157710 A1 EP4157710 A1 EP 4157710A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shell
- floating unit
- cable
- positioning
- cofferdam
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007667 floating Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000009434 installation Methods 0.000 title description 10
- 238000005553 drilling Methods 0.000 claims abstract description 29
- 238000012423 maintenance Methods 0.000 claims abstract description 11
- 238000002955 isolation Methods 0.000 claims description 35
- 238000010079 rubber tapping Methods 0.000 claims description 21
- 238000007789 sealing Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 230000007613 environmental effect Effects 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
- B63B17/0018—Arrangements or devices specially adapted for facilitating access to underwater elements, e.g. to propellers ; Externally attached cofferdams or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B81/00—Repairing or maintaining vessels
Definitions
- This invention relates to the repair and maintenance of the shell or hull of floating units, such as any floating platform or vessel with floatation tanks, where said tanks are fully or partially submerged.
- the technique is achieved by passing cables or ropes through the hull of the floating unit.
- the present method provides a dry working area for offshore floating units, using portable cofferdam, without the need of divers for placement of portable cofferdam into its position.
- Floating units such as any floating platform or vessel with floatation tanks, where said tanks are fully or partially submerged require specific methods and technology for repair and maintenance of their hull as going to the dry dock is not practical.
- Portable cofferdams are widely used to provide a dry working area, due to their size, portability, and reusability, making it safe to perform a repair and maintenance of the hull of a floating unit.
- the portable cofferdam is a portable enclosure composed by the water barrier (portable cofferdam itself), water discharge pump, vent connections, dewatering hoses, lifting connections and lifting lines.
- the water discharge pump dewaters the portable cofferdam, pumping water out through the discharge hoses, providing a dry and safe working area for repair and maintenance.
- Lifting lines are used for lowering of portable cofferdam, by hanging it down from any lifting appliance.
- the portable cofferdam is lowered to the proximity of the repair area with a lifting appliance, such as a crane, and finally positioned to the target repair area with divers who control the portable cofferdam movements due to ocean waves and currents.
- a lifting appliance such as a crane
- This procedure is unsafe for the divers, costly and takes a long time because it is very dependent upon the environmental and weather conditions.
- US10435860 present a portable cofferdam designed for isolating a working area from water such as a culvert.
- the device provides the dewatering of the desired working area, allowing the cutting of the floating hull or any other necessary work on the area. Due to its portability and durability, it can be fished back to the deck, prepared again, and relaunched for the repairing of a new area.
- US10011145 and W02015/002742 present an apparatus for inspecting and small repairing of flooded cavities in a floating offshore installation, on the wall of a pipe, sea chest or other flooded cavity within the hull of a ship or floating offshore installation.
- This technology is only used for inspection purposes, or small repairing, such as replacement of damaged pipe sections, US6241424, and removing blockages in subsea pipelines, US6200068.
- This invention presents new apparatuses and methods for passing a rope or cable through the hull and guiding a portable cofferdam to the desired repair or maintenance area without diver intervention.
- the presented invention uses a sealed cutting apparatus to make a hole directly on the hull of a floating unit.
- another sealed apparatus is used to pass the cable or rope through the hull of a floating unit.
- This rope or cable may be fished from the floating unit deck, to be used as a positioning cable for a portable cofferdam.
- the positioning cables may be tensioned from inside the floating unit hull, to achieve proper sealing and provide a dry working area for the repair or maintenance of the floating unit hull itself.
- This invention makes it possible to install the portable cofferdam without diver intervention. Traditionally, always the diver intervention is required for portable cofferdam installation.
- a system for passing a cable through the shell of a floating unit which comprises:
- the positioning cable can has attached a buoy, the positioning cable can be connected to a fishing line, the equipment for cutting or drilling a hole in the shell of a structure can be a hot tapping tool, the equipment used to lift, tow or sustain loads can be a winch and the shell of a floating unit can be a hull of a floating unit.
- a system for conceiving a dry working area on the shell of a floating unit without diver intervention comprises:
- the portable cofferdam can be a guided cofferdam and the shell of the floating unit can be the hull of a floating unit.
- the guided cofferdam comprises:
- the hot tapping comprising:
- each positioning cable comprises:
- the cable deployment tool comprises:
- the pushing launching arm comprises:
- the method related to the system for passing a cable through the shell of a floating unit comprises: a.cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole in the shell of a structure; b.closing the isolation valve and removing the equipment for cutting or drilling a hole in the shell of a floating unit; c.connecting the cable deployment tool to the isolation valve; d.passing one rope or cable connected to the equipment used to lift, tow or sustain loads through the mechanical seals; e.connecting the end termination to set up the positioning cable; f.connecting the cable deployment tool to the isolation valve; g.opening the isolation valve and passing positioning cable throughout the hole on the shell using the pushing launching arm or the threaded launching arm; h.repeat steps (a) to (g) until the desired number of positioning cables is reached; and i.catching the positioning cables on the seaside or wet side of the shell floating unit.
- the method is composed by the following steps: cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole in the shell of a structure; closing the isolation valve and removing the equipment for cutting or drilling a hole in the shell of a floating unit; connecting the cable deployment tool to the isolation valve; passing one rope or cable connected to the equipment used to lift, tow or sustain loads through the mechanical seals; connecting the end termination to set up the positioning cable; connecting the cable deployment tool to the isolation valve; opening the isolation valve and passing positioning cable throughout the hole on the shell using the pushing launching arm or the hot; repeat steps to pass the cable until the desired number of positioning cables is reached; catching the positioning cables on the seaside or wet side of the shell floating unit; pulling the positioning cables up to the deck of a floating unit, where the portable cofferdam is seated on deck; connecting the positioning cables to the guiding connections
- the shell of the floating unit is ready to be repaired or get maintenance as both sides of the shell are dry and the shell may be cut with no water ingress to the floating unit. It is important to notice that the equipment for cutting or drilling a hole in the shell of a structure can be a hot tapping, the equipment used to lift, tow or sustain loads can be a winch and the shell of the floating unit can be a hull of a floating unit.
- the method wherein before to cut a hole on the shell of the floating unit with the hot tapping tool comprises these additional steps: a.welding the pipe stub to the dry side of the shell of the floating unit; b.connecting the isolation valve to the pipe stub; and c.connecting the hot tapping tool to the isolation valve .
- this invention is applied to any offshore installation comprising a floating unit with floating tanks, where said tanks are fully or partially submerged.
- the fed cables end can be connected to a buoy for facilitating fishing of said cables, specially on hard environment conditions, such as windy weather and rough sea.
- this method provides a diverless technic of repair of a shell of a submersible structure.
- FIG. 1 shows the pipe stub (6) welded from the inside to the floating unit hull (9).
- FIG. 2 shows the installation of an isolation valve (7) to the pipe stub (6).
- FIG. 3 contains an example of the hot tapping device for use in this invention, comprising a valve chamber, a pressurized chamber, a tap cutter (21), a pilot drill (22), and tapping machine (23).
- FIG.4 shows the installation of the hot tapping device to the isolation valve (7).
- FIG.4 shows the hot tapping device drilling from the inside to the floating unit hull (9).
- FIG. 5a contains the cable deployment tool (5) parts of the flange (51), pushing launching arm (52), mechanical seals (53), and chamber (54) before the cable passing process.
- FIG. 5b contains the cable deployment tool (5) parts of the flange (51), pushing launching arm (52), mechanical seals (53), and chamber (54) after the cable passing process.
- FIG. 6a, FIG. 6b and FIG. 6c contains a schematic description of the cables (3) feeding through the cable deployment tool (5) throughout the holes on the floating unit hull (9).
- FIG. 6d, FIG. 6e and FIG. 6f contains a schematic description of the cables (3) feeding through the cable deployment tool (5) with optional attached floats (33) being available to be fished on the outside of the floating unit hull (9).
- FIG. 7 contains a schematic description of the portable cofferdam (1) being guided by the positioning cables (3), while being lowered by a lifting appliance.
- FIG. 8 contains a schematic description of the vessel hull (7) with the cables (3) passed through the holes on the vessel hull (7). At this moment the portable cofferdam can be pulled against the shell to achieve proper sealing.
- FIG. 9 contains a schematic description of the guided cofferdam (1) with cofferdam body (11), lifting connections (12), guiding connections (13), sealing (14), dewatering connection (15) and the cables (3).
- the positioning cable can has attached a buoy (33), the positioning cable can be connected to a fishing line (10), the equipment for cutting or drilling a hole in the shell of a structure (2) can be a hot tapping tool, the equipment used to lift, tow or sustain loads (4) can be a winch and the shell of a floating unit can be the hull of a floating unit (9).
- the portable cofferdam (1) can be a guided cofferdam (2) and the shell of the floating unit can be the hull of a floating unit (9).
- this structure comprises:
- this structure comprises:
- this structure comprises:
- this structure comprises:
- this structure comprises:
- the first system is related to a method for passing a cable through the shell of a floating unit.
- the method is composed by the following steps: cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole (2) in the shell of a structure; closing the isolation valve(7) and removing the equipment for cutting or drilling a hole in the shell of a floating unit; connecting the cable deployment tool(5) to the isolation valve(7); passing one rope or cable (31) connected to the equipment used to lift, tow or sustain loads (4) through the mechanical seals(53); connecting the end termination (32) to set up the positioning cable(3); connecting the cable deployment tool(5) to the isolation valve (23); opening the isolation valve (23) and passing positioning cable (3) throughout the hole on the shell using the pushing launching arm (52) or the threaded launching arm; repeat steps (a) to (g) until the desired number of positioning cables(3) is reached; taking into account that those positioning cables can float with the help of a buoy (33) in your extremity; catching the positioning cables(3) on the seaside or
- the hot tapping device is sealed, what makes it possible to open the isolation valve (7) without flooding the floating unit tank.
- the pilot drill (22) and tap cutter (21) is able to access the hull and make the hole.
- the second system is related to a method for conceiving a dry working area on the hull of a floating unit without diver intervention.
- the method is composed by the following steps: cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole (2) in the shell of a structure; closing the isolation valve (7) and removing the equipment for cutting or drilling a hole in the shell of a floating unit; connecting the cable deployment tool(5) to the isolation valve(7); passing one rope or cable (31) connected to the equipment used to lift, tow or sustain loads (4) through the mechanical seals(53); connecting the end termination (32) to set up the positioning cable (3); connecting the cable deployment tool(5) to the isolation valve (23); opening the isolation valve (23) and passing positioning cable (3) throughout the hole on the shell using the pushing launching arm(52) or the threaded launching arm; repeat steps to pass the cable until the desired number of positioning cables(3) is reached; catching the positioning cables(3) on the seaside or wet side of the shell floating unit(9); pulling the positioning cables(3)
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Earth Drilling (AREA)
Abstract
This invention relates to the repair and maintenance of the shell of floating offshore units such as ships, floating platforms, floating drilling platforms and offshore wind towers. In particularly exemplary embodiments, the present apparatuses and method for passing a cable or rope through the hull of a floating unit and installatiid50000117065202 Pub Copy null Filing No.:25on without diver intervention of portable cofferdam which provides a dry working area for offshore floating units.
Description
SYSTEM AND METHOD FOR PASSING THE CABLE THROUGH THE SHELL OF A FLOATING UNIT AND INSTALLATION OF PORTABLE COFFERDAM
WITHOUT DIVER INTERVENTION
FIELD OF THE INVENTION
[001] This invention relates to the repair and maintenance of the shell or hull of floating units, such as any floating platform or vessel with floatation tanks, where said tanks are fully or partially submerged. The technique is achieved by passing cables or ropes through the hull of the floating unit. In particularly exemplary embodiments, the present method provides a dry working area for offshore floating units, using portable cofferdam, without the need of divers for placement of portable cofferdam into its position.
BACKGROUND OF THE INVENTION
[002] Floating units, such as any floating platform or vessel with floatation tanks, where said tanks are fully or partially submerged require specific methods and technology for repair and maintenance of their hull as going to the dry dock is not practical. Portable cofferdams are widely used to provide a dry working area, due to their size, portability, and reusability, making it safe to perform a repair and maintenance of the hull of a floating unit. The portable cofferdam is a portable enclosure composed by the water barrier (portable cofferdam itself), water discharge pump, vent connections, dewatering hoses, lifting connections and lifting lines. Once the portable cofferdam
is placed on the repair area on the hull, the water discharge pump dewaters the portable cofferdam, pumping water out through the discharge hoses, providing a dry and safe working area for repair and maintenance. Lifting lines are used for lowering of portable cofferdam, by hanging it down from any lifting appliance.
[003] Conventionally, the portable cofferdam is lowered to the proximity of the repair area with a lifting appliance, such as a crane, and finally positioned to the target repair area with divers who control the portable cofferdam movements due to ocean waves and currents. This procedure is unsafe for the divers, costly and takes a long time because it is very dependent upon the environmental and weather conditions. For example, US10435860 present a portable cofferdam designed for isolating a working area from water such as a culvert. The device provides the dewatering of the desired working area, allowing the cutting of the floating hull or any other necessary work on the area. Due to its portability and durability, it can be fished back to the deck, prepared again, and relaunched for the repairing of a new area. There is no mention in this patent of the method for placing it on the desired area or pulling it back to the deck.
[004] If the intention is inspecting flooded cavities in a floating offshore installation, it is possible to do that with a sealed cutting apparatus on the wall of a pipe, sea chest or other flooded cavity within the hull of a ship or floating offshore installation. For example,
US10011145 and W02015/002742 present an apparatus for inspecting and small repairing of flooded cavities in a floating offshore installation, on the wall of a pipe, sea chest or other flooded cavity within the hull of a ship or floating offshore installation. This technology is only used for inspection purposes, or small repairing, such as replacement of damaged pipe sections, US6241424, and removing blockages in subsea pipelines, US6200068. It is important to note that repair or maintenance of the hull or shell of a ship or floating unit is not being discussed in the above mentioned patents. It is also worth mentioning that making a hole in the above mentioned methods is being done on the wall of a pipe or a cavity of a ship, and not directly on the hull of the ship or floating unit.
[005] This invention presents new apparatuses and methods for passing a rope or cable through the hull and guiding a portable cofferdam to the desired repair or maintenance area without diver intervention. The presented invention uses a sealed cutting apparatus to make a hole directly on the hull of a floating unit. On a second stage, another sealed apparatus is used to pass the cable or rope through the hull of a floating unit. This rope or cable may be fished from the floating unit deck, to be used as a positioning cable for a portable cofferdam. In addition, the positioning cables may be tensioned from inside the floating unit hull, to achieve proper sealing and provide a dry working area for the repair or maintenance of the floating unit hull itself. This invention makes it possible to install the portable cofferdam without diver intervention.
Traditionally, always the diver intervention is required for portable cofferdam installation.
SUMMARY OF THE INVENTION
[006] According to the first embodiment of this invention, a system for passing a cable through the shell of a floating unit, which comprises:
- equipment for cutting or drilling a hole in the shell of a structure;
- positioning cable;
- equipment used to lift, tow or sustain loads;
- cable deployment tool;
- pipe stub; and
- isolation valve.
[007] Besides that, the positioning cable can has attached a buoy, the positioning cable can be connected to a fishing line, the equipment for cutting or drilling a hole in the shell of a structure can be a hot tapping tool, the equipment used to lift, tow or sustain loads can be a winch and the shell of a floating unit can be a hull of a floating unit.
[008] According to the second embodiment of this invention, a system for conceiving a dry working area on the shell of a floating unit without diver intervention is presented and comprises:
- portable cofferdam; and
- dewatering hose.
[009] Besides that, the portable cofferdam can be a guided cofferdam and the shell of the floating unit can be the hull of a floating unit.
[010] It is also important to notice, that the guided cofferdam comprises:
- cofferdam body;
- lifting connections;
- guiding connections;
- sealing; and
- dewatering connection.
[Oil] In addition, the hot tapping comprising:
- tap cutter;
- pilot drill; and
- tapping machine.
[012] Furthermore, each positioning cable comprises:
- rope or cable; and
- end termination.
[013] Besides that, the cable deployment tool comprises:
- flange;
- pushing launching arm;
- mechanical seals; and chamber.
[014] Besides that, the pushing launching arm comprises:
- threaded launching arm;
[015] It is important to notice the method related to the system for passing a cable through the shell of a floating unit, that comprises: a.cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole in the shell of a structure; b.closing the isolation valve and removing the equipment for cutting or drilling a hole in the shell of a floating unit; c.connecting the cable deployment tool to the isolation valve; d.passing one rope or cable connected to the equipment used to lift, tow or sustain loads through the mechanical seals; e.connecting the end termination to set up the positioning cable; f.connecting the cable deployment tool to the isolation valve; g.opening the isolation valve and passing positioning cable throughout the hole on the shell using the pushing launching arm or the threaded launching arm; h.repeat steps (a) to (g) until the desired number of positioning cables is reached; and i.catching the positioning cables on the seaside or wet side of the shell floating unit.
[016] Related to the system described, there is a method for conceiving a dry working area on the hull of a floating unit without diver intervention is provided. The method is composed by the following steps: cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole in the shell of a structure; closing the isolation valve and removing the equipment for cutting or drilling a hole in the shell of a floating unit; connecting the cable deployment tool to the isolation valve; passing one rope or cable connected to the equipment used to lift, tow or sustain loads through the mechanical seals; connecting the end termination to set up the positioning cable; connecting the cable deployment tool to the isolation valve; opening the isolation valve and passing positioning cable throughout the hole on the shell using the pushing launching arm or the hot; repeat steps to pass the cable until the desired number of positioning cables is reached; catching the positioning cables on the seaside or wet side of the shell floating unit; pulling the positioning cables up to the deck of a floating unit, where the portable cofferdam is seated on deck; connecting the positioning cables to the guiding connections located inside the portable cofferdam; lowering of the portable cofferdam, which is hanging from a crane or any other lifting appliance, while the positioning cables are being pulled in by their corresponding equipment used to lift, tow or sustain loads inside the hull, until the cofferdam reaches its target position, where it will be pulled against the hull in order to produce the proper sealing; dewatering of the portable
cofferdam using the dewatering hose to generate the differential pressure and thus compress the sealing even more, in order to provide a dry working area inside the portable cofferdam. The shell of the floating unit is ready to be repaired or get maintenance as both sides of the shell are dry and the shell may be cut with no water ingress to the floating unit. It is important to notice that the equipment for cutting or drilling a hole in the shell of a structure can be a hot tapping, the equipment used to lift, tow or sustain loads can be a winch and the shell of the floating unit can be a hull of a floating unit.
[017] The method wherein before to cut a hole on the shell of the floating unit with the hot tapping tool comprises these additional steps: a.welding the pipe stub to the dry side of the shell of the floating unit; b.connecting the isolation valve to the pipe stub; and c.connecting the hot tapping tool to the isolation valve .
[018] Additionally, this invention is applied to any offshore installation comprising a floating unit with floating tanks, where said tanks are fully or partially submerged.
[019] In another embodiment, the fed cables end can be connected to a buoy for facilitating fishing of said cables, specially on hard environment conditions, such as
windy weather and rough sea.
[020] In another embodiment, this method provides a diverless technic of repair of a shell of a submersible structure.
BRIEF DESCRIPTION OF THE DRAWINGS
[021] The accompanying drawings are incorporated in and constitute a part of the specification. The drawings, together with the general description given above and the detailed description of the exemplary embodiments given below, explain the principles of the invention. In such drawings:
[022] FIG. 1 shows the pipe stub (6) welded from the inside to the floating unit hull (9).
[023] FIG. 2 shows the installation of an isolation valve (7) to the pipe stub (6).
[024] FIG. 3 contains an example of the hot tapping device for use in this invention, comprising a valve chamber, a pressurized chamber, a tap cutter (21), a pilot drill (22), and tapping machine (23).
[025] FIG.4 shows the installation of the hot tapping device to the isolation valve (7).
[026] FIG.4 shows the hot tapping device drilling
from the inside to the floating unit hull (9).
[027] FIG. 5a contains the cable deployment tool (5) parts of the flange (51), pushing launching arm (52), mechanical seals (53), and chamber (54) before the cable passing process.
[028] FIG. 5b contains the cable deployment tool (5) parts of the flange (51), pushing launching arm (52), mechanical seals (53), and chamber (54) after the cable passing process.
[029] FIG. 6a, FIG. 6b and FIG. 6c contains a schematic description of the cables (3) feeding through the cable deployment tool (5) throughout the holes on the floating unit hull (9).
[030] FIG. 6d, FIG. 6e and FIG. 6f contains a schematic description of the cables (3) feeding through the cable deployment tool (5) with optional attached floats (33) being available to be fished on the outside of the floating unit hull (9).
[031] FIG. 7 contains a schematic description of the portable cofferdam (1) being guided by the positioning cables (3), while being lowered by a lifting appliance.
[032] FIG. 8 contains a schematic description of the vessel hull (7) with the cables (3) passed through the holes on the vessel hull (7). At this moment the portable
cofferdam can be pulled against the shell to achieve proper sealing.
[033] FIG. 9 contains a schematic description of the guided cofferdam (1) with cofferdam body (11), lifting connections (12), guiding connections (13), sealing (14), dewatering connection (15) and the cables (3).
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
[034] Reference will now be made in detail to exemplary embodiments and methods of the invention. It should be noted, however, that the invention in its broader aspects is not necessarily limited to the specific details, representative materials and methods, and illustrative examples shown and described in connection with the exemplary embodiments and methods.
[035] There is a first system comprised by:
- equipment for cutting or drilling a hole in the shell of a structure (2);
- positioning cable (3);
- equipment used to lift, tow or sustain loads (4);
- cable deployment tool (5);
- pipe stub (6); and
- isolation valve (7).
[036] There is a second system comprised by the equipment of the first system and additionally:
- portable cofferdam (1); and
dewatering hose (8).
[037] Also, it is important to notice that the positioning cable can has attached a buoy (33), the positioning cable can be connected to a fishing line (10), the equipment for cutting or drilling a hole in the shell of a structure (2) can be a hot tapping tool, the equipment used to lift, tow or sustain loads (4) can be a winch and the shell of a floating unit can be the hull of a floating unit (9).
[038] Besides that, the portable cofferdam (1) can be a guided cofferdam (2) and the shell of the floating unit can be the hull of a floating unit (9).
[039] Concerning the guided cofferdam (1), this structure comprises:
- cofferdam body (11);
- lifting connections (12);
- guiding connections (13);
- sealing (14); and
- dewatering connection (15).
[040] Concerning the hot tapping tool, this structure comprises:
- tap cutter (21);
- pilot drill (22); and
- tapping machine (23).
[041] Concerning the positioning cable (3), this
structure comprises:
- rope or cable (31); and
- end termination (32).
[042] Concerning the cable deployment tool (5), this structure comprises:
- flange (51);
- pushing launching arm (52);
- mechanical seals (53); and
- chamber (54).
[043] Concerning the pushing launching arm (52), this structure comprises:
- threaded launching arm.
[044] Thus, the first system is related to a method for passing a cable through the shell of a floating unit. The method is composed by the following steps: cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole (2) in the shell of a structure; closing the isolation valve(7) and removing the equipment for cutting or drilling a hole in the shell of a floating unit; connecting the cable deployment tool(5) to the isolation valve(7); passing one rope or cable (31) connected to the equipment used to lift, tow or sustain loads (4) through the mechanical seals(53); connecting the end termination (32) to set up the positioning cable(3); connecting the cable deployment tool(5) to the isolation valve (23); opening the isolation valve (23) and passing positioning cable (3) throughout the hole on the shell using
the pushing launching arm (52) or the threaded launching arm; repeat steps (a) to (g) until the desired number of positioning cables(3) is reached; taking into account that those positioning cables can float with the help of a buoy (33) in your extremity; catching the positioning cables(3) on the seaside or wet side of the shell floating unit(9) by a fishing line (10), for example.
[045] The hot tapping device is sealed, what makes it possible to open the isolation valve (7) without flooding the floating unit tank. When the isolation valve (7) is open, the pilot drill (22) and tap cutter (21) is able to access the hull and make the hole.
[046] Thus, the second system is related to a method for conceiving a dry working area on the hull of a floating unit without diver intervention. The method is composed by the following steps: cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole (2) in the shell of a structure; closing the isolation valve (7) and removing the equipment for cutting or drilling a hole in the shell of a floating unit; connecting the cable deployment tool(5) to the isolation valve(7); passing one rope or cable (31) connected to the equipment used to lift, tow or sustain loads (4) through the mechanical seals(53); connecting the end termination (32) to set up the positioning cable (3); connecting the cable deployment tool(5) to the isolation valve (23); opening the isolation valve (23) and passing positioning cable (3) throughout the hole on the shell using the pushing launching arm(52) or the threaded
launching arm; repeat steps to pass the cable until the desired number of positioning cables(3) is reached; catching the positioning cables(3) on the seaside or wet side of the shell floating unit(9); pulling the positioning cables(3) up to the deck of a floating unit, where the portable cofferdam (1) is seated on deck; connecting the positioning cables (3) to the guiding connections (13) located inside the portable cofferdam (1); lowering of the portable cofferdam (1), which is hanging from a crane or any other lifting appliance, while the positioning cables (3) are being pulled in by their corresponding equipment used to lift, tow or sustain loads (4) inside the hull, until the cofferdam reaches its target position, where it will be pulled against the hull in order to produce the proper sealing; dewatering of the portable cofferdam (1) using the dewatering hose(8) to generate the differential pressure and thus compress the sealing (12) even more, in order to provide a dry working area inside the portable cofferdam (1). The shell of the floating unit is ready to be repaired or get maintenance as both sides of the shell are dry and the shell may be cut with no water ingress to the floating unit.
Claims
1. A system for passing a cable through the shell of a floating unit, which comprises: equipment for cutting or drilling a hole in the shell of a structure (2); positioning cable (3); equipment used to lift, tow or sustain loads (4); cable deployment tool (5); pipe stub (6); and isolation valve (7).
2. The system of claim 1, wherein a buoy (33) can be connected to the positioning cable (3).
3. The system of claim 1, wherein a fishing line (10) can be connected to the positioning cable (3).
4.The system of claim 1, wherein the equipment for cutting or drilling a hole in the shell of a structure (2) is a hot tapping tool.
5. The system of claim 1, wherein the equipment used to lift, tow or sustain loads (4) is a winch.
6.The system of claim 1, wherein the shell of a floating unit is the hull of a floating unit (9).
7.A system for conceiving a dry working area on the shell of a floating unit without diver intervention, which
comprises :
- portable cofferdam (1); and
- dewatering hose (8).
8.The system of claim 7, wherein the shell of a floating unit is the hull of a floating unit (9).
9.The system of claim 7, wherein the portable cofferdam is a guided cofferdam.
10.The system of claims 7 and 9 wherein the guided cofferdam (1) comprises:
- cofferdam body (11)
- lifting connections (12)
- guiding connections (13);
- sealing (14); and
- dewatering connection (15).
11.The system of claims 1 or 7 wherein the hot tapping tool (2) comprises:
- tap cutter (21);
- pilot drill (22); and
- tapping machine (23).
12.The system of claim 1 or 7, wherein each positioning cable (3) comprises:
- rope or cable (31); and
- end termination (32).
13.The system of claim 1 or 7, wherein the cable deployment
tool (5) comprises:
- flange (51);
- pushing launching arm (52);
- mechanical seals (53); and
- chamber (54).
14.The system of claim 13, wherein the pushing launching arm (52) comprises:
- threaded launching arm (521).
15.A method for conceiving system for passing a cable through the shell of a floating unit without diver intervention, comprising the steps of: a. cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole (2) in the shell of a structure; b. closing the isolation valve(7) and removing the equipment for cutting or drilling a hole in the shell of a floating unit; c. connecting the cable deployment tool(5) to the isolation valve(7); d. passing one rope or cable (31) connected to the equipment used to lift, tow or sustain loads (4) through the mechanical seals(53); e. connecting the end termination (32) to set up the positioning cable(3); f. connecting the cable deployment tool(5) to the isolation valve (7); g. opening the isolation valve (23) and passing positioning cable (3) throughout the hole on
the shell using the pushing launching arm(52) or the threaded launching arm (521); h. repeat steps (a) to (g) until the desired number of positioning cables(3) is reached; and i. catching the positioning cables(3) on the seaside or wet side of the shell floating unit (9).
16.The method of claim 15, wherein the process to catch the positioning cables (3) can be executed using the fishing line(10).
17.The method of claim 15, wherein the equipment for cutting or drilling a hole in the shell of a structure (2) is a hot tapping.
18. The method of claim 15, wherein the equipment used to lift, tow or sustain loads (4) is a winch.
19.The method of claim 15, wherein the shell of a floating unit is the hull of a floating unit (9).
20.A method for conceiving a dry working area on the shell of floating unit without diver intervention, comprising the steps of: a. cutting or drilling a hole on the shell of a floating unit with an equipment for cutting or drilling a hole (2) in the shell of a structure; b. closing the isolation valve(7) and removing the equipment for cutting or drilling a hole in the
shell of a floating unit; c. connecting the cable deployment tool(5) to the isolation valve(7); d. passing one rope or cable (31) connected to the equipment used to lift, tow or sustain loads (4) through the mechanical seals(53); e. connecting the end termination (32) to set up the positioning cable(3); f. connecting the cable deployment tool(5) to the isolation valve (23); g. opening the isolation valve (23) and passing positioning cable (3) throughout the hole on the shell using the pushing launching arm (52) or the threaded launching arm (521); h. repeat steps (a) to (g) until the desired number of positioning cables(3) is reached; i. catching the positioning cables(3) on the seaside or wet side of the shell floating unit (9); j. pulling the positioning cables(3) up to the deck of a floating unit, where the portable cofferdam (1) is seated on deck; k. connecting the positioning cables (3) to the guiding connections (13) located inside the portable cofferdam (1); l. lowering of the portable cofferdam (1), which is hanging from a crane or any other lifting appliance, while the positioning cables (3) are being pulled in by their corresponding equipment used to lift, tow or sustain loads
(4) inside the hull, until the cofferdam reaches its target position, where it will be pulled against the hull in order to produce the proper sealing; m. dewatering of the portable cofferdam (1) using the dewatering hose(8) to generate the differential pressure and thus compress the sealing (12) even more, in order to provide a dry working area inside the portable cofferdam (1); and n. The shell of the floating unit is ready to be repaired or get maintenance as both sides of the shell are dry and the shell may be cut with no water ingress to the floating unit.
21. The method of claim 20, wherein the process to catch the positioning cables (3) can be executed using the fishing line (10).
22.The method of claim 20, wherein the equipment for cutting or drilling a hole in the shell of a structure (2) is a hot tapping.
23. The method of claim 20, wherein the equipment used to lift, tow or sustain loads (4) is a winch.
24.The method of claim 20, wherein the shell of a floating unit is the hull of a floating unit (9).
25.The method of claim 15 and/or 20, wherein before to
cut a hole on the shell of the floating unit with the hot tapping tool(2) comprises these additional steps: a. welding the pipe stub (6) to the dry side of the shell of the floating unit; b. connecting the isolation valve(7) to the pipe stub (6); and c. connecting the hot tapping tool (2) to the isolation valve(7).
26. The method of claim 25, wherein the shell of a floating unit is the hull of a floating unit (9).
27.The method of any one of the previous claims, wherein the said floating unit comprises any floating platform or vessel with floatation tanks, where said tanks are fully or partially submerged.
28.The method of any one of the previous claims, wherein each of the positioning cables (3) is connected to an equipment used to lift, tow or sustain loads (4), installed inside the floating unit.
29.The method of claims any one of the previous claims, wherein said guiding cables(3) are used to bring the cofferdam(l) into the target area on the hull(9) and to compress the sealing (12), by tightening the guiding cables(3) connected to the guiding padeyes(13) welded inside of the cofferdam(l). This is done by further pulling the cofferdam(l) against the hull(9) of the floating unit, especially in case of harsh
environmental conditions, such as an open or a rough sea.
30.The method of any one of the previous claims, wherein the positioning cables (3) have a buoy (33) connected to their extremity in order to ease their fishing.
31.The method of any one of the previous claims, wherein said method is used as a diverless repair technic of the hull of a floating unit (9).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US202063031414P | 2020-05-28 | 2020-05-28 | |
PCT/BR2021/050073 WO2021237323A1 (en) | 2020-05-28 | 2021-02-17 | System and method for passing the cable through the shell of a floating unit and installation of portable cofferdam without diver intervention |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4157710A1 true EP4157710A1 (en) | 2023-04-05 |
EP4157710A4 EP4157710A4 (en) | 2024-07-03 |
Family
ID=78745716
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21814494.7A Pending EP4157710A4 (en) | 2020-05-28 | 2021-02-17 | System and method for passing the cable through the shell of a floating unit and installation of portable cofferdam without diver intervention |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP4157710A4 (en) |
WO (1) | WO2021237323A1 (en) |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO124361B (en) * | 1966-06-27 | 1972-04-10 | Mitsubishi Heavy Ind Ltd | |
US3641774A (en) * | 1970-01-30 | 1972-02-15 | Kaiser Steel Corp | Method and apparatus for fabricating an offshore structure |
US3857249A (en) * | 1973-03-22 | 1974-12-31 | T Kelly | Cofferdam |
US4175510A (en) * | 1977-10-25 | 1979-11-27 | Devine Thomas H | Cofferdam |
US4161155A (en) * | 1978-06-30 | 1979-07-17 | Cloutier Charles C | Patch for ship hulls |
US5036786A (en) * | 1990-03-23 | 1991-08-06 | Joseph Uri | Patch system for ship hulls |
US5009180A (en) * | 1990-09-07 | 1991-04-23 | Holt William T | Hull hole closure for an oil tanker |
US5165356A (en) * | 1991-12-13 | 1992-11-24 | Phillip A. Steele | Magnetic ship hull patch |
US6200068B1 (en) * | 1998-02-06 | 2001-03-13 | Sonsub, Inc. | Hot tap fluid blaster apparatus and method of using same |
US6241424B1 (en) * | 1998-03-17 | 2001-06-05 | Sonsub Inc. | Method and apparatus for replacing damaged section of a subsea pipeline without loss of product or entry of seawater |
WO2006072675A1 (en) * | 2005-01-03 | 2006-07-13 | Ropart Jean-Francois | Device for obstructing a water path on a vessel |
KR101204489B1 (en) * | 2010-10-28 | 2012-11-26 | 대한민국(해양경찰청장) | vessel break-hole part emergency blockade device |
US20130000538A1 (en) * | 2011-06-30 | 2013-01-03 | John Patrick Connolly | Exterior hull patch |
US8590471B2 (en) * | 2011-12-02 | 2013-11-26 | John Connolly Connolly | Oil leak containment system for a ship hard aground |
GB201210929D0 (en) * | 2012-06-20 | 2012-08-01 | E M & I Maritime Ltd | Apparatus and method |
ITMI20130693A1 (en) * | 2013-04-26 | 2014-10-27 | Fincantieri Cantieri Navali It | METHOD OF MAINTENANCE OF A RETRACTABLE PROPULSOR |
US20160138747A1 (en) * | 2013-07-02 | 2016-05-19 | Johnny Butler | System for cutting a workpiece and method for the same |
GB2520688B (en) * | 2013-11-27 | 2019-05-01 | E M & I Maritime Ltd | Apparatus and method for inspecting flooded cavities in a floating offshore installation |
KR101880242B1 (en) * | 2017-04-18 | 2018-07-20 | 주식회사 도우 | Coffer dam |
CA3094321A1 (en) * | 2018-03-19 | 2019-09-26 | Resolve Marine Group, Inc. | Marine salvage drill assemblies and systems |
EP4143081A1 (en) * | 2020-04-30 | 2023-03-08 | E M & I (Maritime) Limited | Method and apparatus for installing a cofferdam, e.g. against the hull of a ship |
-
2021
- 2021-02-17 WO PCT/BR2021/050073 patent/WO2021237323A1/en unknown
- 2021-02-17 EP EP21814494.7A patent/EP4157710A4/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP4157710A4 (en) | 2024-07-03 |
WO2021237323A1 (en) | 2021-12-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3366173A (en) | Subsea production system | |
RU2146633C1 (en) | Ship mooring system | |
US8342777B2 (en) | Floating support including a turret fitted with a disconnectable buoy for mooring bottom-to-surface connection pipes and method | |
NO139060B (en) | APPARATUS FOR SEATING SUBSIDIARY PIPELINES | |
US8622137B2 (en) | Subsea structure installation or removal | |
NO150791B (en) | MARINT RISING SYSTEM | |
US3703207A (en) | Subsea bunker construction | |
US9254894B2 (en) | Flotable subsea platform (FSP) | |
JP6104404B2 (en) | How to remove and / or install underwater part of retractable thruster unit | |
CN105460183B (en) | Self-floating waterproof cabin and its application method under water | |
GB2429990A (en) | Drilling guide frame assembly | |
CA2646510C (en) | Connection system and method for connecting and disconnecting a floating unit to and from a buoy which is connected to a subsea installation | |
AU2013100495A4 (en) | Buoy | |
CN105552821A (en) | Water proofing type underwater cable connecting method | |
KR101792706B1 (en) | Riser and floating drillship the same | |
AU2003295993A1 (en) | Ballast system for tension leg platform | |
WO2021237323A1 (en) | System and method for passing the cable through the shell of a floating unit and installation of portable cofferdam without diver intervention | |
GB2284629A (en) | Installing underwater storage tank | |
GB2157749A (en) | Submersible manifold unit | |
AU2013101562A4 (en) | Buoy | |
CN113028298B (en) | Embedding device for single detector for mud entering into seabed | |
CN113074970A (en) | Submarine pipeline mud-entering leakage test device suitable for deep sea scene | |
Berg | The Development of the Controlled Buoyancy System for Installation of Submerged Pipelines | |
Yuan et al. | Analytical Predictions and Field Observations in Lufeng15-1 DPP Jacket Upending and Lowering | |
KR20150000167A (en) | BOP Test Apparatus and Method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20221216 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230526 |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) |