EP2121426A1 - Method and device for connecting a tanker at sea - Google Patents

Method and device for connecting a tanker at sea

Info

Publication number
EP2121426A1
EP2121426A1 EP08723980A EP08723980A EP2121426A1 EP 2121426 A1 EP2121426 A1 EP 2121426A1 EP 08723980 A EP08723980 A EP 08723980A EP 08723980 A EP08723980 A EP 08723980A EP 2121426 A1 EP2121426 A1 EP 2121426A1
Authority
EP
European Patent Office
Prior art keywords
tanker
loading
stern
facility
loading facility
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.)
Granted
Application number
EP08723980A
Other languages
German (de)
French (fr)
Other versions
EP2121426B1 (en
Inventor
Hans Richard Hansen
Reinert Nordtveit
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Altera Norway AS
Original Assignee
Teekay Norway AS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Teekay Norway AS filed Critical Teekay Norway AS
Priority to PL08723980T priority Critical patent/PL2121426T3/en
Publication of EP2121426A1 publication Critical patent/EP2121426A1/en
Application granted granted Critical
Publication of EP2121426B1 publication Critical patent/EP2121426B1/en
Priority to CY20111100656T priority patent/CY1111948T1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/24—Arrangement of ship-based loading or unloading equipment for cargo or passengers of pipe-lines

Definitions

  • This invention relates to a method for connecting a tanker at sea. More particularly, it relates to a method for connecting a tanker to a loading facility at sea, in which, after having positioned itself at the loading facility, the tanker is connected to a loading hose for fluid to be transferred from the loading facility to the tanker.
  • the stern of the tanker is turned towards the loading facility, the tanker being provided at its stern with propulsion machinery which is steer- able in the horizontal plane, after which the loading hose is connected to a cargo manifold located at the stern of the tanker.
  • the offshore loading facility may include, for example, a loading buoy or a production ship, often referred to as an FPSO (Floating Production, Storage and Offloading) vessel.
  • FPSO Floating Production, Storage and Offloading
  • loading of this kind is relatively vulnerable to weather, as forces from waves and wind acting on the bow of the tanker must be balanced by sufficient force from the thrusters to hold the bow of the tanker in a substantially fixed position relative to the loading facility. Especially in the wintertime it happens that loading must be put off because the effect of the thrusters is not sufficient to ensure that the bow of the tanker will stay in the right position during the loading.
  • bow manifolds are relatively highly exposed to sea spray and, thereby, icing in wintertime. This may entail considerable extra work before loading can be started.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
  • a method in accordance with the invention for the connection of a tanker to a loading facility at sea, in which, after having positioned itself at the loading facility, the tanker is connected to a loading hose for fluid to be transferred from the loading facility to the tanker, is characterized by the stern of the ship being turned towards the loading facil- ity, the tanker being provided, at its stern, with propulsion machinery which is steerable in the horizontal plane, and the loading hose then being connected to a cargo manifold which is located at the stern of the tanker.
  • the tanker is provided with so-called dynamic positioning, in which a control system calculates, by means 5 of external navigation signals, any current deviation from a desired position, the control system seeking to reduce the deviation by means of the steering and propulsion machinery of the tanker.
  • the propulsion machinery which is steerable ino the horizontal plane, includes at least two propellers which are arranged to be pivoted in the horizontal plane.
  • the propulsion machinery of tankers of this kind has substantially greater efficiency than what could possibly be transmitted via thrusters at the bow. s
  • matters are well arranged for the tanker to be held in position by means of the positioning system's control of the power and relative direction of the propulsion machinery, while the stern of the tanker is connected to the loading facility. This is also the case in considerably worse weathero conditions than those under which it is possible to load when the bow of a tanker is to be held in a particular position.
  • the cargo manifold which is at the stern of the tanker, is set back somewhat on the poop of the tanker, in order for any leakage at the manifold connection to be cap-5 tured and directed to a collecting tank.
  • the loading hose may be formed by known loading hose arrangements and is not limited to a loading hose which is reeled up, in its inactive position, at the loading facility.
  • the cargo manifold which is located at the poop, is wello protected from sea spray and icing during the sailing to the loading device, which simplifies to a substantial degree the connecting work in cold periods and in northern waters.
  • Figure 1 shows schematically a side view of a tanker which is connected to a production ship
  • Figure 2 shows schematically a plan view of the tanker and production ship of figure 1.
  • the reference numeral 1 indicates a tanker, for example a so-called “shuttle tanker” which is used for transporting crude oil from sea-based production sites to inshore receiving facilities.
  • the tanker 1 is connected to a loading facility 2 in the form of a production ship by means of a loading hose 4.
  • the loading hose 4 is formed by, for example, a flexible hose which is reeled up, in its inactive position, on a drum 6 on the production ship 2.
  • the loading hose 4 is provided with a connection 8 which complementarily fits a cargo manifold 10 in a manifold housing 12 on the poop 14 of the tanker 1.
  • the propulsion machinery 16 of the tanker 1 includes two propulsion propellers 18 steerable in the horizontal plane, which are placed at the stern 20 of the ship 1.
  • the propulsion propellers 18 take different directions rela- tive to the longitudinal axis of the tanker 1. This indicates that the direction and thrust of the propulsion propellers 18 are controlled to keep the stern 20 of the tanker 1 in a desired position relative to the production ship 2.
  • the bow 22 of the tanker 1 may be allowed to turn according to the wind and weather. If necessary, the thrusters 24 of the tanker 1 are used to maintain the direction of the tanker 1.
  • the stern 20 of the tanker 1 is stabilized in this position as explained above .
  • the loading hose 4 is disconnected from the cargo manifold 10 and pulled back onto the production ship 2.
  • the tanker 1 then sails to its destination.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Ship Loading And Unloading (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Pipeline Systems (AREA)
  • Bulkheads Adapted To Foundation Construction (AREA)
  • Revetment (AREA)

Abstract

A method and device for connecting a tanker (1) at a loading facility (2) at sea, in which, after having positioned itself at the loading facility (2), the tanker (1) is connected to a loading hose (4) for fluid to be transferred from the loading facility (2) to the tanker (1), and in which the stern (20) of the tanker (1) is turned towards the loading facility (2), the tanker (1) being provided, at its stern (20), with propulsion machinery (16) steerable in the horizontal plane, and in which the loading hose (4) is then connected to a cargo manifold (10) positioned at the stern (20) of the tanker (1).

Description

METHOD AND DEVICE FOR CONNECTING A TANKER AT SEA
This invention relates to a method for connecting a tanker at sea. More particularly, it relates to a method for connecting a tanker to a loading facility at sea, in which, after having positioned itself at the loading facility, the tanker is connected to a loading hose for fluid to be transferred from the loading facility to the tanker. The stern of the tanker is turned towards the loading facility, the tanker being provided at its stern with propulsion machinery which is steer- able in the horizontal plane, after which the loading hose is connected to a cargo manifold located at the stern of the tanker.
So-called buoy loading of tankers at sea is used to a considerable extent, for example for loading crude oil from some fields in the North Sea. The offshore loading facility may include, for example, a loading buoy or a production ship, often referred to as an FPSO (Floating Production, Storage and Offloading) vessel.
Several solutions have been developed, some of which include mooring of the tanker and connection to a submerged buoy, whereas, in other solutions, it may be unnecessary to moor the tanker.
Gradually, so-called bow loading has come into relatively wide use. The method involves that the tanker to be loaded moves its bow up to the loading facility. A loading hose is then passed from the loading facility and connected to the cargo manifold of the tanker, which is at the bow of the tanker. During the loading the tanker is held in position by means of the propulsion machinery of the tanker and relatively powerful thrusters at the bow of the tanker.
However, loading of this kind is relatively vulnerable to weather, as forces from waves and wind acting on the bow of the tanker must be balanced by sufficient force from the thrusters to hold the bow of the tanker in a substantially fixed position relative to the loading facility. Especially in the wintertime it happens that loading must be put off because the effect of the thrusters is not sufficient to ensure that the bow of the tanker will stay in the right position during the loading.
Besides, bow manifolds are relatively highly exposed to sea spray and, thereby, icing in wintertime. This may entail considerable extra work before loading can be started.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
The object is achieved according to the invention through the features which are specified in the description below and in the claims that follow.
A method in accordance with the invention for the connection of a tanker to a loading facility at sea, in which, after having positioned itself at the loading facility, the tanker is connected to a loading hose for fluid to be transferred from the loading facility to the tanker, is characterized by the stern of the ship being turned towards the loading facil- ity, the tanker being provided, at its stern, with propulsion machinery which is steerable in the horizontal plane, and the loading hose then being connected to a cargo manifold which is located at the stern of the tanker.
With advantage, the tanker is provided with so-called dynamic positioning, in which a control system calculates, by means 5 of external navigation signals, any current deviation from a desired position, the control system seeking to reduce the deviation by means of the steering and propulsion machinery of the tanker.
Preferably, the propulsion machinery, which is steerable ino the horizontal plane, includes at least two propellers which are arranged to be pivoted in the horizontal plane. The propulsion machinery of tankers of this kind has substantially greater efficiency than what could possibly be transmitted via thrusters at the bow. s Thus, matters are well arranged for the tanker to be held in position by means of the positioning system's control of the power and relative direction of the propulsion machinery, while the stern of the tanker is connected to the loading facility. This is also the case in considerably worse weathero conditions than those under which it is possible to load when the bow of a tanker is to be held in a particular position.
Preferably, the cargo manifold, which is at the stern of the tanker, is set back somewhat on the poop of the tanker, in order for any leakage at the manifold connection to be cap-5 tured and directed to a collecting tank.
The loading hose may be formed by known loading hose arrangements and is not limited to a loading hose which is reeled up, in its inactive position, at the loading facility.
The cargo manifold, which is located at the poop, is wello protected from sea spray and icing during the sailing to the loading device, which simplifies to a substantial degree the connecting work in cold periods and in northern waters.
In what follows, there is described a non-limiting example of a preferred method and embodiment which are visualized in the accompanying drawings, in which:
Figure 1 shows schematically a side view of a tanker which is connected to a production ship; and
Figure 2 shows schematically a plan view of the tanker and production ship of figure 1.
In the drawings the reference numeral 1 indicates a tanker, for example a so-called "shuttle tanker" which is used for transporting crude oil from sea-based production sites to inshore receiving facilities. The tanker 1 is connected to a loading facility 2 in the form of a production ship by means of a loading hose 4. The loading hose 4 is formed by, for example, a flexible hose which is reeled up, in its inactive position, on a drum 6 on the production ship 2.
At its free end portion, the loading hose 4 is provided with a connection 8 which complementarily fits a cargo manifold 10 in a manifold housing 12 on the poop 14 of the tanker 1.
The propulsion machinery 16 of the tanker 1 includes two propulsion propellers 18 steerable in the horizontal plane, which are placed at the stern 20 of the ship 1. In figure 2 the propulsion propellers 18 take different directions rela- tive to the longitudinal axis of the tanker 1. This indicates that the direction and thrust of the propulsion propellers 18 are controlled to keep the stern 20 of the tanker 1 in a desired position relative to the production ship 2.
In the main, the bow 22 of the tanker 1 may be allowed to turn according to the wind and weather. If necessary, the thrusters 24 of the tanker 1 are used to maintain the direction of the tanker 1.
When a tanker 1 is to connect to a production ship 2, alter- natively another loading facility, not shown, the stern 20 of the tanker 1 is turned towards the production ship 2, the tanker 1 being moved to an appropriate distance from the production ship 2.
The stern 20 of the tanker 1 is stabilized in this position as explained above .
A line, not shown, is shot across from the production vessel 2, whereby the loading hose 4 is gradually pulled across and connected to the cargo manifold 10 on the poop 14, after which loading of the tanker 1 may take place .
When the loading is finished, the loading hose 4 is disconnected from the cargo manifold 10 and pulled back onto the production ship 2. The tanker 1 then sails to its destination.

Claims

C l a i m s
1. A method for connecting a tanker (1) to a loading facility (2) at sea, in which, after having positioned itself at the loading facility (2) , the tanker (1) is connected to a loading hose (4) for fluid to be transferred from the loading facility (2) to the tanker (1), c h a r a c t e r i z e d i n that the stern (20) of the tanker (1) is turned towards the loading facility (2) , the tanker (1) being provided, at its stern (20) , with a propulsion propeller (18) steerable in the horizontal plane, and the loading hose (4) is then connected to a cargo manifold (10) positioned at the stern (20) of the tanker (1) , after which the tanker (1) receives cargo from the loading facility (2) .
2. The method in accordance with claim 1, c h a r a c t e r i z e d i n that the position of the tanker (1) during the loading is maintained by means of dynamic positioning.
3. A device for a tanker (1) for connection to a loading facility (2) at sea, c h a r a c t e r i z e d i n that at its stern (20) the tanker (1) is provided with a propulsion propeller (18) pivotal in the horizontal plane, and the cargo manifold (10) of the tanker is arranged near the stern (20) of the tanker (1) .
4. The device in accordance with claim 3, c h a r a c t e r i z e d i n that the tanker (1) is provided with two or more independently steerable propulsion propellers (18) . The device in accordance with claim 4, c h a r a c t e r i z e d i n that the cargo manifold (10) is on the poop (14) of the tanker (1) .
EP08723980A 2007-03-15 2008-03-11 Method and device for connecting a tanker at sea Not-in-force EP2121426B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL08723980T PL2121426T3 (en) 2007-03-15 2008-03-11 Method and device for connecting a tanker at sea
CY20111100656T CY1111948T1 (en) 2007-03-15 2011-07-06 TANKER CONNECTION METHOD AND MECHANISM IN SEA

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20071395A NO336151B1 (en) 2007-03-15 2007-03-15 Method and apparatus for connecting a tanker to an offshore loading facility
PCT/NO2008/000088 WO2008127117A1 (en) 2007-03-15 2008-03-11 Method and device for connecting a tanker at sea

Publications (2)

Publication Number Publication Date
EP2121426A1 true EP2121426A1 (en) 2009-11-25
EP2121426B1 EP2121426B1 (en) 2011-04-27

Family

ID=39529325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08723980A Not-in-force EP2121426B1 (en) 2007-03-15 2008-03-11 Method and device for connecting a tanker at sea

Country Status (11)

Country Link
EP (1) EP2121426B1 (en)
AT (1) ATE507139T1 (en)
BR (1) BRPI0808744A2 (en)
CA (1) CA2680755C (en)
CY (1) CY1111948T1 (en)
DE (1) DE602008006531D1 (en)
DK (1) DK2121426T3 (en)
ES (1) ES2364954T3 (en)
NO (1) NO336151B1 (en)
PL (1) PL2121426T3 (en)
WO (1) WO2008127117A1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO300536B1 (en) * 1994-11-24 1997-06-16 Norske Stats Oljeselskap Three anchor system for ships
NO970301L (en) * 1997-01-24 1998-07-27 Pgs Offshore Technology As Device by tanker
US20020134455A1 (en) * 2001-03-23 2002-09-26 Leif Hoegh & Co. Asa Vessel and unloading system
US6688348B2 (en) * 2001-11-06 2004-02-10 Fmc Technologies, Inc. Submerged flowline termination buoy with direct connection to shuttle tanker

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008127117A1 *

Also Published As

Publication number Publication date
CY1111948T1 (en) 2015-11-04
PL2121426T3 (en) 2011-09-30
NO336151B1 (en) 2015-05-26
EP2121426B1 (en) 2011-04-27
CA2680755C (en) 2014-09-09
ES2364954T3 (en) 2011-09-19
CA2680755A1 (en) 2008-10-23
BRPI0808744A2 (en) 2014-08-12
DE602008006531D1 (en) 2011-06-09
NO20071395L (en) 2008-09-16
ATE507139T1 (en) 2011-05-15
DK2121426T3 (en) 2011-08-08
WO2008127117A1 (en) 2008-10-23

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