GB2029794A - Fluid Transfer System - Google Patents

Fluid Transfer System Download PDF

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Publication number
GB2029794A
GB2029794A GB7836649A GB7836649A GB2029794A GB 2029794 A GB2029794 A GB 2029794A GB 7836649 A GB7836649 A GB 7836649A GB 7836649 A GB7836649 A GB 7836649A GB 2029794 A GB2029794 A GB 2029794A
Authority
GB
United Kingdom
Prior art keywords
boom
section
tanker
outer boom
pipe
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
GB7836649A
Other versions
GB2029794B (en
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.)
David Brown Vosper Offshore Ltd
Original Assignee
David Brown Vosper Offshore Ltd
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 David Brown Vosper Offshore Ltd filed Critical David Brown Vosper Offshore Ltd
Priority to GB7836649A priority Critical patent/GB2029794B/en
Publication of GB2029794A publication Critical patent/GB2029794A/en
Application granted granted Critical
Publication of GB2029794B publication Critical patent/GB2029794B/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67D—DISPENSING, DELIVERING OR TRANSFERRING LIQUIDS, NOT OTHERWISE PROVIDED FOR
    • B67D9/00—Apparatus or devices for transferring liquids when loading or unloading ships
    • B67D9/02—Apparatus or devices for transferring liquids when loading or unloading ships using articulated pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0118—Offshore
    • F17C2270/0121—Platforms

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)

Abstract

The invention relates to a fluid transfer system for use in an offshore platform. The invention is particularly suitable for use in the transfer of a cryogenic liquid where the product transfer pipe may not be allowed to flex excessively. The transfer system comprises an inner boom 20 which is heavy and an outer boom 26 which is relatively light and counter-balanced by a weight 28. A product pipe 18 is suspended from the free end of the outer boom which is additionally tied to the tank by a cable 40. As the tanker 10 moves up and down relative to the platform 12 the outer boom 26 pivots about the outer end of the inner boom 20 and the cable 40 is maintained in tension. No forces are transmitted by the transfer hose 18 which only flexes to allow lateral movement of the tanker 10. <IMAGE>

Description

SPECIFICATION Fluid Transfer System The present invention relates to fluid transfer system for transferring fluids between a platform and a vessel. The invention is particularly intended to be applied to the transfer of liquefied gas to and from a tanker.
A tanker when used in the North Sea may move by very substantial amounts, both up and down and from side to side, relative to a platform.
When a transfer pipe connects the tanker to the platform, it is normal to allow a large amount of slack in the pipe to accommodate such movements. However, liquefied gas presents the additional problem that the pipe cannot withstand excessive flexing.
According to the present invention, a fluid transfer system for transferring fluids between a platform and a floating vessel comprises an inner boom pivotably mounted at one end on the platform and supporting a first, rigid, section of a product pipe; a light counter balanced outer boom pivotably mounted on the outer end of the inner boom and supporting or comprising a second, rigid, section of the product pipe pivotably connected to the said first section; a third, flexible, section of product pipe suspended from the outer end of the outer boom and pivotably connected to the said second section, the lower end of the said flexible third section being provided with a coupling for connection to a flange on the vessel; and means for tying the free end of the outer boom to the tanker; the counter-balance for the outer boom being arranged to over-compensate for the weight of the outer boom whereby the means tying the free end of the outer boom to the tanker is maintained in tension.
The invention will now be described further, by way of example, with reference to the accompanying drawing, which is an elevation of a fluid transfer system in accordance with the invention.
In the accompanying drawing, a product pipe for carrying a cryogenic liquid from a tanker 10 to an oil platform generally designated 1 2 comprises three sections 14, 16 and 18. The section 14 is rigid and is carried by an inner boom 20 which is pivotably mounted at one end on the oil platform 12. A crane 22 serves to adjust the position of the inner boom 20, the latter being very long and relatively heavy. The section 1 6 of the product pipe is pivotably connected by a swivel connection 24 to the first section 14 and is carried by a lighter outer boom 26 which is itself pivotably mounted on the outer end of the inner boom 20. The outer boom 26 is counter-balanced by a weight 28 carried by an arm 30 which is pivotably mounted on the inner boom, 20. A cable 32 connects the arm 30 to the outer boom 1 6.
The flexible pipe 1 8 is freely suspended from the end of the outer boom 26 and is pivotably connected to the second, rigid, section 1 6 of the product pipe. At its lower end, the pipe 1 8 is provided with a coupling 34 which connects onto a flange on the tanker 10 in the usual manner. In addition to the pipe 18, a cable 40 which is in tension connects the outer end of the outer boom 26 to the tanker 1 6. The cable 40 is maintain in tension by virtue of the fact that the counterbalance weight 1 8 over-compensates the weight of the outer boom 26 and the sections of the product pipe carried by it.
Being relatively heavy, the inner boom 20 cannot follow movements of the tanker 1 0. The outer boom 26, on the other hand, is relatively light and counter-balanced and it therefore has a small moment about its pivot axis and exerts only a small upward force on the tanker 10 sufficient to keep the cable 40 in tension. The outer boom 26 may therefore freely follow movements of the tanker but at no stage is the flexible pipe 1 8 put under stress, all this tension being taken by the cable 40. The flexible section 1 8 of the product pipe is only required to flex by a small amount to allow for lateral movement of the tanker 10 but such movements do not place excessive stress on the flexible pipe 1 8 even when the fluid being transferred is cryogenic.
Claims
1. A fluid transfer system for transferring fluids between a platform and a floating vessel comprising an inner boom pivotably mounted at one end on the platform and supporting a first, rigid, section of a product pipe; a light counter balanced outer boom pivotably mounted on the outer end of the inner boom and supporting or comprising a second, rigid, section of the product pipe pivotably connected to the said first section; a third, flexible, section of product pipe suspended from the outer end of the outer boom and pivotabiy connected to the said second section, the lower end of the said flexible third section being provided with a coupling for connection to a flange on the vessel; and means for tying the free end of the outer boom to the tanker; the counterbalance for the outer boom being arranged to over-compensate for the weight of the outer boom whereby the means tying the free end of the outer boom to the tanker is maintained in tension.
2. A fluid transfer system as claimed in Claim 1, wherein the counter-balance weight is pivoted about an arm supported by the inner boom, the counter-balance weight being arranged near the inner end of the inner boom and the said arm being connected by way of a flexible cable to the said outer boom.
3. A fluid transfer system substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (3)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Fluid Transfer System The present invention relates to fluid transfer system for transferring fluids between a platform and a vessel. The invention is particularly intended to be applied to the transfer of liquefied gas to and from a tanker. A tanker when used in the North Sea may move by very substantial amounts, both up and down and from side to side, relative to a platform. When a transfer pipe connects the tanker to the platform, it is normal to allow a large amount of slack in the pipe to accommodate such movements. However, liquefied gas presents the additional problem that the pipe cannot withstand excessive flexing. According to the present invention, a fluid transfer system for transferring fluids between a platform and a floating vessel comprises an inner boom pivotably mounted at one end on the platform and supporting a first, rigid, section of a product pipe; a light counter balanced outer boom pivotably mounted on the outer end of the inner boom and supporting or comprising a second, rigid, section of the product pipe pivotably connected to the said first section; a third, flexible, section of product pipe suspended from the outer end of the outer boom and pivotably connected to the said second section, the lower end of the said flexible third section being provided with a coupling for connection to a flange on the vessel; and means for tying the free end of the outer boom to the tanker; the counter-balance for the outer boom being arranged to over-compensate for the weight of the outer boom whereby the means tying the free end of the outer boom to the tanker is maintained in tension. The invention will now be described further, by way of example, with reference to the accompanying drawing, which is an elevation of a fluid transfer system in accordance with the invention. In the accompanying drawing, a product pipe for carrying a cryogenic liquid from a tanker 10 to an oil platform generally designated 1 2 comprises three sections 14, 16 and 18. The section 14 is rigid and is carried by an inner boom 20 which is pivotably mounted at one end on the oil platform 12. A crane 22 serves to adjust the position of the inner boom 20, the latter being very long and relatively heavy. The section 1 6 of the product pipe is pivotably connected by a swivel connection 24 to the first section 14 and is carried by a lighter outer boom 26 which is itself pivotably mounted on the outer end of the inner boom 20. The outer boom 26 is counter-balanced by a weight 28 carried by an arm 30 which is pivotably mounted on the inner boom, 20. A cable 32 connects the arm 30 to the outer boom 1 6. The flexible pipe 1 8 is freely suspended from the end of the outer boom 26 and is pivotably connected to the second, rigid, section 1 6 of the product pipe. At its lower end, the pipe 1 8 is provided with a coupling 34 which connects onto a flange on the tanker 10 in the usual manner. In addition to the pipe 18, a cable 40 which is in tension connects the outer end of the outer boom 26 to the tanker 1 6. The cable 40 is maintain in tension by virtue of the fact that the counterbalance weight 1 8 over-compensates the weight of the outer boom 26 and the sections of the product pipe carried by it. Being relatively heavy, the inner boom 20 cannot follow movements of the tanker 1 0. The outer boom 26, on the other hand, is relatively light and counter-balanced and it therefore has a small moment about its pivot axis and exerts only a small upward force on the tanker 10 sufficient to keep the cable 40 in tension. The outer boom 26 may therefore freely follow movements of the tanker but at no stage is the flexible pipe 1 8 put under stress, all this tension being taken by the cable 40. The flexible section 1 8 of the product pipe is only required to flex by a small amount to allow for lateral movement of the tanker 10 but such movements do not place excessive stress on the flexible pipe 1 8 even when the fluid being transferred is cryogenic. Claims
1. A fluid transfer system for transferring fluids between a platform and a floating vessel comprising an inner boom pivotably mounted at one end on the platform and supporting a first, rigid, section of a product pipe; a light counter balanced outer boom pivotably mounted on the outer end of the inner boom and supporting or comprising a second, rigid, section of the product pipe pivotably connected to the said first section; a third, flexible, section of product pipe suspended from the outer end of the outer boom and pivotabiy connected to the said second section, the lower end of the said flexible third section being provided with a coupling for connection to a flange on the vessel; and means for tying the free end of the outer boom to the tanker; the counterbalance for the outer boom being arranged to over-compensate for the weight of the outer boom whereby the means tying the free end of the outer boom to the tanker is maintained in tension.
2. A fluid transfer system as claimed in Claim 1, wherein the counter-balance weight is pivoted about an arm supported by the inner boom, the counter-balance weight being arranged near the inner end of the inner boom and the said arm being connected by way of a flexible cable to the said outer boom.
3. A fluid transfer system substantially as hereinbefore described with reference to and as illustrated in the accompanying drawing.
GB7836649A 1978-09-13 1978-09-13 Fluid transfer system Expired GB2029794B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB7836649A GB2029794B (en) 1978-09-13 1978-09-13 Fluid transfer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7836649A GB2029794B (en) 1978-09-13 1978-09-13 Fluid transfer system

Publications (2)

Publication Number Publication Date
GB2029794A true GB2029794A (en) 1980-03-26
GB2029794B GB2029794B (en) 1982-08-04

Family

ID=10499635

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7836649A Expired GB2029794B (en) 1978-09-13 1978-09-13 Fluid transfer system

Country Status (1)

Country Link
GB (1) GB2029794B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009019262A1 (en) * 2007-08-03 2009-02-12 Iga Tec Gmbh Lifting/lowering device, loading system, and related method
US7857001B2 (en) 2002-12-10 2010-12-28 Moss Maratime Ac System and method to transfer fluid

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7857001B2 (en) 2002-12-10 2010-12-28 Moss Maratime Ac System and method to transfer fluid
WO2009019262A1 (en) * 2007-08-03 2009-02-12 Iga Tec Gmbh Lifting/lowering device, loading system, and related method

Also Published As

Publication number Publication date
GB2029794B (en) 1982-08-04

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Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee