WO2023170006A1 - Colonne montante d'admission d'eau de mer - Google Patents
Colonne montante d'admission d'eau de mer Download PDFInfo
- Publication number
- WO2023170006A1 WO2023170006A1 PCT/EP2023/055627 EP2023055627W WO2023170006A1 WO 2023170006 A1 WO2023170006 A1 WO 2023170006A1 EP 2023055627 W EP2023055627 W EP 2023055627W WO 2023170006 A1 WO2023170006 A1 WO 2023170006A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- riser
- ballast
- water
- vessel
- seawater intake
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2/12—Heating; Cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63J—AUXILIARIES ON VESSELS
- B63J2/00—Arrangements of ventilation, heating, cooling, or air-conditioning
- B63J2002/005—Intakes for coolant medium other than sea chests, e.g. for ambient water
Definitions
- the present invention relates to a seawater intake riser. Also, the invention relates to a method for manufacturing such a seawater intake riser. Furthermore, the invention relates to a method for deploying such a seawater intake riser.
- such a seawater intake riser features a single solid ballast acting as inlet or a ballast fully composed by hanging chains.
- the solid ballast system has a difficult and relatively expensive implementation, as the deployment needs an installation vessel with a high capacity crane. Also, installation windows are more restrictive depending on the geographical location and climate zone.
- the lift of the solid ballast connected to the riser pipe could be particularly instable, especially if the sea conditions are not optimal.
- the movements of the riser pipe could perturb the stability of the lift and increase tensions in the rigging.
- the solid ballast would be lifted in a horizontal configuration, meaning that very long wire slings will be required. This would require a very significant height under the crane hook and would increase the risks of uncontrolled movements during deployment.
- ballast composed by hanging chains only, it’s an easier solution to deploy a seawater intake riser, as it only requires Anchor Handling Tug Supply (AHTS) vessels, and installation windows are less restrictive when compared to solid ballast.
- AHTS Anchor Handling Tug Supply
- it may lead to compression in the riser pipe part of the system, which is not permitted.
- a seawater intake riser configured for intake of water from a body of water comprising: a riser pipe, a riser head configured for connection to a water tank (in a hull) of a vessel and a riser inlet configured for the intake of water; the riser head arranged at a proximal end of the riser pipe and the riser inlet arranged at a distal end of the riser pipe; the riser inlet comprising a grid element with openings configured to allow water to flow into the interior of the riser pipe while blocking objects floating in the flowing water to enter; the grid element comprising a connector configured to attach a ballast to the grid element, wherein the ballast is a distributed ballast of a plurality of ballast elements arranged in a string; the string at one end thereof connected to the connector and the plurality of ballast elements in the string spaced apart from each other along the length of the string by intermediate line segments.
- the invention relates to a method for deploying a seawater intake riser as described above, on a moored hydrocarbon production vessel floating on a body of water, the moored vessel comprising a water tank; the method comprising:
- a floating seawater intake riser portion consisting of the riser pipe including the riser head and the riser inlet and a pickup line, in which a free end of the riser head is attached to the first service vessel, and the pickup line is attached to a free end of the riser inlet;
- the invention provides a seawater intake riser that is easier to install due to the use of a distributed ballast.
- the distributed ballast elements have predetermined smaller dimensions than a prior art single solid ballast allowing them to be handled individually during the deployment, which reduces the need for specialty installation equipment such as a heavy duty crane.
- the arrangement of the distributed ballast elements in a string allows to have a ballast with relative increased slenderness, which reduces axial added mass and drag. Accordingly, the stability of the seawater intake riser is improved.
- Figure 1 schematically shows a seawater intake riser according to an embodiment of the invention
- Figure 2 schematically shows a ballast of a seawater intake riser according to an embodiment
- Figures 3A - 3H schematically show steps of a deployment procedure for a seawater intake riser according to an embodiment.
- Figure 1 schematically shows a vessel 200 equipped with a seawater intake riser 100 according to an embodiment of the invention.
- a vessel 200 is floating that is equipped with a seawater intake riser 100.
- a vessel is for example, a hydrocarbon production vessel, such as an floating production storage and offloading, FPSO, floating production unit, FPU, floating storage and offloading, FSO, or floating liquefied natural gas, FLNG, vessel.
- the hydrocarbon production vessel is moored during operation, either spread moored or turret moored.
- the hydrocarbon production vessel can be a tension leg platform, TLP, equipped with a seawater intake riser.
- processing equipment 204 on the vessel produces hydro-carbon fluids from sources as undersea gas or oil fields. During this operation the processing equipment on the vessel 200 uses seawater for auxiliary purposes such as cooling.
- seawater is taken in from the body of water by a water intake system comprising a seawater intake riser 100.
- the seawater intake riser 100 has a length L with an inlet 102 at a depth that substantially matches the required temperature of the water taken in. Typically, the temperature of seawater is lower at larger depths than at the surface. For example, in tropical waters, a temperature of about 7°C is found at a depth of about 700m below sea level.
- the seawater intake riser 100 according to the invention comprises a riser head 104, a riser pipe 106, a riser inlet 102 and a ballast 108.
- the riser pipe106 is connected at a proximal end 106a to the riser head 104, and at a distal end 106b to the riser inlet 102.
- the riser pipe 106 is manufactured from a polymer, for example high density polyethylene, HDPE.
- a riser pipe in one piece up-to for example 700 m can be manufactured by extrusion of the polymer material.
- the riser head 104 is configured to couple to a water tank or caisson 206 in the vessel 200 to create a connection between the riser pipe 106 and the water tank 206.
- the riser inlet 102 is arranged on the riser pipe 106 as an inlet for water from the body of water in which the riser pipe is immersed.
- the riser inlet 102 comprises a grid element with openings configured to allow water to flow into the interior of the riser pipe while blocking objects floating in the flowing water to enter. Further the riser inlet 102 comprises a connector configured to attach to the ballast 108.
- the ballast is provided to obtain a relatively stable vertical arrangement of the seawater intake riser 100, by reducing drag of the riser due to a (tidal) stream in the body of water.
- Fig 2 schematically shows the riser inlet 102 and ballast 108 of a seawater intake riser according to an embodiment.
- the riser inlet 102 comprises the grid element 110 which has a substantially cylindrical shape with preferably openings 112 arranged in the radial direction.
- the size of the individual openings 112 is such that objects or marine life can be prevented to enter the riser pipe volume.
- a connector 114 is provided to which the ballast 108 can be connected.
- the ballast 108 is configured as a distributed ballast comprising a plurality of ballast elements 120 (i.e. , two or more) that are moveable relative to each other.
- the ballast elements are arranged in a string in which the ballast elements are interconnected by an intermediate line segment 122 between successive ballast elements.
- the ballast string is extending vertically under the grid element 110 and connector 114 with the ballast elements 120 positioned one above the other.
- the intermediate line segments 122 provide that adjacent ballast elements 120 are spaced apart and moveable relative to each other.
- the line segments 122 can be manufactured from one or more of synthetic or polyester rope, steel rope and steel chain.
- the ballast elements 120 have an elongated cylindrical shape like for example a torpedo with coupling elements 124 at each end that are configured to connect to a intermediate line segment 122.
- one or more ballast elements has a cylindrical shape, in particular a slim cylindrical shape i.e., with relatively small diameter compared to a length of the cylinder.
- the coupling elements 124 have a substantially conical shape or rounded shape which usefully reduces the drag from the water stream on the ballast elements 120.
- the ballast elements 120 are preferably designed to a size and weight that the connected ballast elements 120 can be manipulated and positioned relative to each other on a deck of an installation/AHTS service vessel (not shown) and that they can withstand the loading/impact of passing over a stern roller of the service vessel during installation.
- the distributed ballast 108 is attached by a first line segment 123 to the connector on the riser inlet and to a proximal end of a first ballast element 120 in the string.
- the first line segment 123 consists of a synthetic or polyester rope.
- Figures 3A - 3H schematically show steps of a deployment procedure for a seawater intake riser according to an embodiment.
- a seawater intake riser component 100-1 is formed from the riser head 104, riser pipe 106 and riser inlet 102. Also, a distributed ballast component 100-2 comprising the string of ballast elements 120 interconnected by intermediate line segments 122 is formed.
- Fig 3A shows schematically a first step of the procedure.
- the seawater intake riser component 100-1 is prepared to float on the body of water by keeping air in the riser volume 130 by means of a sealing system (no shown) that closes off the internal volume of the seawater intake riser component 100-1.
- a first service vessel 31 is provided to connect to the riser head 106 by a towing cable 32.
- a second service vessel 33 such as an AHTS vessel is provided which carries on its loading deck the distributed ballast component 100-2. The second service vessel 33 is connected to the riser inlet by a floating auxiliary line 35 which has been taken up by the second vessel 33 from the water.
- Fig 3B shows schematically a next step of the deployment.
- the first ballast element 120 of the distributed ballast 108 is attached to the connector 114 of the riser inlet 102 by means of the first line segment and overboarded.
- the floating auxiliary line 35 is removed or disconnected from the riser inlet.
- the sealing system is still present, which ensures the seawater intake riser component 100-1 remains floating while the first ballast element is hanging below the seawater intake riser component.
- the sealing system in this step when overboarding a first ballast element, the sealing system has been opened or removed.
- the opening of the sealing system causes the internal volume of the seawater intake riser to fill with water which in combination with the weight of the grid element will pull the riser’s end that is provided with the riser inlet down.
- the opening the sealing system will allow water will enter the seawater intake riser and the end with the riser inlet to sink, while the other end of the seawater intake riser component remains connected to the second service vessel and relatively close to the water surface.
- Fig 3D shows schematically a following step of the deployment.
- the distributed ballast 108 consisting of the string of ballast elements 120 is overboarded from the loading deck of the second service vessel 33 by controllably releasing the ballast elements one after another into the seawater.
- Fig 3E shows schematically a next step.
- an second auxiliary line 36 is attached to it.
- the second auxiliary line 36 is taut in this condition, while holding the end of the distributed ballast 120;122. Accordingly, the distributed ballast will be on a relatively curved line.
- the second auxiliary line 36 is then slackened to lower the distributed ballast 108 until the floating seawater intake riser 100 is floating in a vertical position in which the riser head 104 is at or near the water surface and the riser inlet 102 is at a depth substantially corresponding with the length L of the riser pipe 106.
- the riser head 104 is still attached to the first service vessel 31 and manoeuvred close to the position of the hydrocarbon production vessel 200.
- Fig 3F- 3G show schematically a subsequent step of the procedure.
- the seawater intake riser 100 including the distributed ballast 108 is handed over to a crane or a winch 208 on the hydrocarbon production vessel.
- An ROV 38 connects a line 40 from the hydrocarbon production vessel to the riser head 104.
- the connecting line 35 between the first service vessel and the seawater intake riser is removed.
- the seawater intake riser is pulled in by the crane or the winch 208 and secured.
- the riser head 104 is connected to an inlet 210 of the water tank 206 of the vessel 200.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Earth Drilling (AREA)
Abstract
La présente invention concerne une colonne montante d'admission d'eau de mer (100) conçue pour l'admission d'eau à partir d'une masse d'eau comprenant un tuyau de colonne montante (106), une tête de colonne montante (104) conçue pour être raccordée à un réservoir d'eau dans un navire et une entrée de colonne montante (102) conçue pour l'admission d'eau. La tête de colonne montante est disposée à une extrémité proximale du tuyau de colonne montante et l'entrée de colonne montante est disposée au niveau d'une extrémité distale du tuyau de colonne montante. L'entrée de colonne montante comprend un élément de grille (110) avec des ouvertures permettant à l'eau de s'écouler à l'intérieur de la colonne montante tout en bloquant les objets flottant dans l'eau en écoulement pour entrer. L'élément de grille comprend un connecteur configuré pour fixer un ballast (108) à l'élément de grille. Le ballast est une pluralité distribuée d'éléments de ballast (120) dans une corde. La corde à une extrémité de celle-ci est reliée au connecteur. Les éléments de ballast dans la corde sont espacés les uns des autres par des lignes intermédiaires.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22160530 | 2022-03-07 | ||
EP22160530.6 | 2022-03-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023170006A1 true WO2023170006A1 (fr) | 2023-09-14 |
Family
ID=80682704
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2023/055627 WO2023170006A1 (fr) | 2022-03-07 | 2023-03-06 | Colonne montante d'admission d'eau de mer |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2023170006A1 (fr) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4281614A (en) * | 1978-08-21 | 1981-08-04 | Global Marine, Inc. | Connection of the upper end of an ocean upwelling pipe to a floating structure |
JP2002284085A (ja) * | 2001-03-26 | 2002-10-03 | Mitsubishi Heavy Ind Ltd | 海水取水方法とその装置 |
WO2011118228A1 (fr) * | 2010-03-26 | 2011-09-29 | 日揮株式会社 | Dispositif de prise d'eau |
-
2023
- 2023-03-06 WO PCT/EP2023/055627 patent/WO2023170006A1/fr unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4281614A (en) * | 1978-08-21 | 1981-08-04 | Global Marine, Inc. | Connection of the upper end of an ocean upwelling pipe to a floating structure |
JP2002284085A (ja) * | 2001-03-26 | 2002-10-03 | Mitsubishi Heavy Ind Ltd | 海水取水方法とその装置 |
WO2011118228A1 (fr) * | 2010-03-26 | 2011-09-29 | 日揮株式会社 | Dispositif de prise d'eau |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4604961A (en) | Vessel mooring system | |
US9340261B2 (en) | Anchor line tensioning method | |
US7793723B2 (en) | Submerged loading system | |
US8734055B2 (en) | Method for assembling an operating rig for a fluid in a body of water and associated operating rig | |
US4086865A (en) | Mooring system | |
US6435124B1 (en) | Mooring and flowline system | |
US20160176480A1 (en) | Subsea remotely operated chain tensioning and slacking system | |
EP3072804B1 (fr) | Procédé d'installation d'une bouée au niveau d'un emplacement d'ancrage | |
US8882390B2 (en) | Method for installing an operating rig for a fluid in a body of water with a traction unit | |
WO2023170006A1 (fr) | Colonne montante d'admission d'eau de mer | |
US4632663A (en) | Mooring and transfer system and method | |
KR101281652B1 (ko) | 케이슨 파이프를 구비한 선박을 이용한 해양플랜트 앵커링 방법 | |
US6685519B1 (en) | System for transferring fluids and methods for installing, modifying and operating system | |
KR101281654B1 (ko) | 케이슨 파이프를 구비한 선박의 앵커링 방법 | |
KR101324118B1 (ko) | 케이슨 파이프를 구비한 선박을 이용한 유빙 관리 방법 | |
EP2398695B1 (fr) | Système d'ancrage en eaux profondes et ultra-profondes | |
KR101346258B1 (ko) | 케이슨 파이프를 구비한 선박 | |
KR101281645B1 (ko) | 케이슨 파이프를 구비한 선박용 메신저 부이 | |
Bensimon et al. | Deepwater Installation of a Large Capacity FPSO with Large Number of Risers in the Marlim Field | |
US20140037385A1 (en) | Method for the assisted installation of an underwater riser | |
Pollack et al. | Installation of deep water sub-sea equipment | |
AU2005203655A1 (en) | System for managing offshore drilled products |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 23709977 Country of ref document: EP Kind code of ref document: A1 |