WO2002066316A1 - A device and method for fastening pressure vessels - Google Patents

A device and method for fastening pressure vessels Download PDF

Info

Publication number
WO2002066316A1
WO2002066316A1 PCT/NO2002/000059 NO0200059W WO02066316A1 WO 2002066316 A1 WO2002066316 A1 WO 2002066316A1 NO 0200059 W NO0200059 W NO 0200059W WO 02066316 A1 WO02066316 A1 WO 02066316A1
Authority
WO
WIPO (PCT)
Prior art keywords
cassette
pressure vessels
ship
accordance
hold
Prior art date
Application number
PCT/NO2002/000059
Other languages
French (fr)
Inventor
Per Lothe
Original Assignee
Knutsen Oas Shipping 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 Knutsen Oas Shipping As filed Critical Knutsen Oas Shipping As
Publication of WO2002066316A1 publication Critical patent/WO2002066316A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/24—Means for preventing unwanted cargo movement, e.g. dunnage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised

Definitions

  • This invention regards fastening of pressure vessels, particularly of the type used for sea transport of pressurised petroleum products.
  • LNG Liquefied Natural Gas
  • the object of the invention is to remedy the disadvantages of the PNG-method of transporting natural gas.
  • the main disadvantage of the PNG-method is the fact that the net weight of the tanks takes up an excessive share of the ship's carrying capacity.
  • the required reduction of the net weight of the tanks can only be achieved by using relatively high-strength materials in combination with construction and certification in accordance with the most appropriate relevant standards.
  • the pressure vessels according to the invention are arranged in relatively longitudinal vertical cassettes, in a manner such that inspection may be carried out at any time, also during the normal running of the ship.
  • the cassettes which in a preferred embodiment are designed to comprise eight pressure vessels, are designed as a plate or trussed structure.
  • the pressure vessels are connected to the cassette structure in an appropriate manner, to ensure that the net weight and thermal stresses affect the pressure vessels to the smallest possible extent.
  • the spacing between the pressure vessels, and between the pressure vessels and the internal structure of the cassette, is sufficient to allow access for inspection equipment. Longitudinal weld seams, which normally suffer the greatest stress, may be oriented inward so as to make them immediately accessible from the central space of the cassette.
  • the cassettes are designed to be pre-fabricated, checked and certified before being positioned in the cargo hold of a ship.
  • the forces exerted by the net weight of the cassettes and the cargo normally bear against the bottom of the ship.
  • the cargo hold may be equipped with slides that are complementary to guides in one or more of the side walls of the cassette.
  • the cassette may be guided onto the slides, e.g. while hanging from a crane, and then lowered into position in a controlled manner.
  • the cassette is held in the horizontal position by the same slides/guides.
  • the pressure vessels in a cassette are connected to a common manifold.
  • the manifold may be of a simple construction, as the temperature differences that will occur between the connected pressure vessels in the structure in question, will be insignificant.
  • Figure 1 shows a section of a ship, where a pressure vessel cassette is being lowered into the cargo hold of the ship;
  • Figure 2 shows a section of the ship of figure 1, where a number of pressure vessel cassettes are arranged in the cargo hold of the ship, and where one pressure vessel cassette and one partition are shown in bold;
  • Figure 3 shows a plan view of a pressure vessel cassette according to figure 2.
  • reference number 1 denotes a pressure vessel cassette comprising a load-bearing trussed structure 2 with guides 4 and required fastening elements 6 for support of eight longitudinal pressure vessels 8 of a type that is known per se.
  • the pressure vessels 8 are equipped with separate connections 10 to a common manifold 12, which in turn is connected to the ship's loading/unloading pipe 14 via a connector 16.
  • the fastening elements 6 may be of any appropriate construction that meets the requirements for a steady connection to the cassette 1, maximum relief of the weight of the pressure vessel 8, and a fixed position relative to the manifold 12.
  • the cargo hold 22 of the ship 20 is provided with bulkheads 24 equipped with slides 26.
  • the guides 4 of the cassette 1 fit the slides 26 in a complementary manner, and the guides 4 are designed to be displaced vertically along the slides 26 during loading of the cassettes 1.
  • the slides 26 are also designed to take up horizontal forces from the cassettes 1.
  • the cargo hold 22 of the ship 20 may be provided with hatches and/or a superstructure 23.
  • the pressure vessels 8 are located along the inside of the trussed structure 2 of the cassette 1. Centrally in the cassette 1 there is a longitudinal space 30 arranged so as to allow inspection access to the pressure vessels 8. The longitudinal welds 9 of the pressure vessels 8 face in towards the space 30.
  • the pressure vessels 8 are arranged with sufficient mutual spacing and distance to the trussed structure 2 of the cassette 1 to allow inspection of the pressure vessels to be carried out through using instruments in accordance with a technique that is known per se, without having to remove the pressure vessel 8 from the cassette 1, see figure 3.
  • the pressure vessels are placed in and connected to the trusswork 2 of the cassette 1 by means of fastening elements 6, prior to the cassette being loaded into the ship's 20 hold 22.
  • the manifold 12 is also connected to the connections 10 of the pressure vessels 8 before loading, which means that all testing and certification can be performed prior to the cassettes 1 leaving the place of manufacture.
  • the cassettes are hoisted to their vertical orientation of use and positioned over the relevant slides 26 provided in the bulkheads of the cargo hold 22.
  • the guides 4 connected to the trussed structure 2 of the cassette 1 fit over the slides 26 in a complementary manner. After the guides 4 have been positioned over the slides 26, the cassette 1 is lowered along the slides 26 until it abuts the floor of the cargo hold 22.
  • the manifold 12 is then connected up to the ship's 20 loading/unloading pipe 14 by means of the connector 16.
  • pressure vessel cassette 1 Using the pressure vessel cassette 1 according to the invention will, when compared with prior art, to a significant degree simplify manufacture, inspection and documentation of the type of pressure vessel 8 in question.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

A device for and method of fastening pressure vessels (8), particularly of the type used for sea transport of pressurised petrolium products, and where at least two pressure vessels (8) are arranged in a cassette (1).

Description

A DEVICE AND METHOD FOR FASTENING PRESSURE VESSELS
This invention regards fastening of pressure vessels, particularly of the type used for sea transport of pressurised petroleum products.
Sea transport of gaseous petroleum products has essentially taken place by use of the so-called Liquefied Natural Gas (LNG) method. The method comprises the cooling of gas to a liquid, whereupon the gas may be transported in ship's tanks at atmospheric pressure. The method requires considerable investments both at the port of shipment and at the receiving end. As the gas must be cooled to a relatively low temperature, up to one fifth of the gas is used for running the cooling and heating processes. To consume this much energy just for the transport related processes is costly and also gives rise to environmental concerns.
Several other ship based solutions have been proposed, in which the gas is pressurised and/or cooled in order to achieve a gas density that is suitable for the purpose. Such solutions have not gained much practical use, but one solution in which a large number of vertical tubular pressure vessels are placed in the cargo hold of a ship, has attracted considerable attention. The method is termed Pressurised Natural Gas - PNG. In accordance with such a method, the gas is compressed to an overpressure of a couple of hundred bar at the port of shipment, and then filled onto the pressure vessels located on the ship. The cooling is limited to simply and economically removing the heat of compression from the gas, to give a transport temperature near the ambient temperature. The great disadvantage of the PNG-method is that the gas cylinders, when manufactured in accordance with known techniques, take up an excessive share of the ship's carrying capacity.
The object of the invention is to remedy the disadvantages of the PNG-method of transporting natural gas.
The object is achieved in accordance with the invention by the characteristics stated in the undermentioned description and in the appended claims.
Modern codes of construction and approval, which allow better utilization of the mechanical properties of pressure vessel materials, attach much greater importance to the documentation of material properties and construction, and also to periodic inspections of pressurised piping and tanks, than that which has previously been the case.
As mentioned above, the main disadvantage of the PNG-method is the fact that the net weight of the tanks takes up an excessive share of the ship's carrying capacity. The required reduction of the net weight of the tanks can only be achieved by using relatively high-strength materials in combination with construction and certification in accordance with the most appropriate relevant standards. In order to render possible the required periodic inspection, the pressure vessels according to the invention are arranged in relatively longitudinal vertical cassettes, in a manner such that inspection may be carried out at any time, also during the normal running of the ship.
The cassettes, which in a preferred embodiment are designed to comprise eight pressure vessels, are designed as a plate or trussed structure. The pressure vessels are connected to the cassette structure in an appropriate manner, to ensure that the net weight and thermal stresses affect the pressure vessels to the smallest possible extent. The spacing between the pressure vessels, and between the pressure vessels and the internal structure of the cassette, is sufficient to allow access for inspection equipment. Longitudinal weld seams, which normally suffer the greatest stress, may be oriented inward so as to make them immediately accessible from the central space of the cassette.
The cassettes are designed to be pre-fabricated, checked and certified before being positioned in the cargo hold of a ship. The forces exerted by the net weight of the cassettes and the cargo normally bear against the bottom of the ship. The cargo hold may be equipped with slides that are complementary to guides in one or more of the side walls of the cassette. Thus the cassette may be guided onto the slides, e.g. while hanging from a crane, and then lowered into position in a controlled manner. The cassette is held in the horizontal position by the same slides/guides.
The pressure vessels in a cassette are connected to a common manifold. The manifold may be of a simple construction, as the temperature differences that will occur between the connected pressure vessels in the structure in question, will be insignificant.
The following describes a non-limiting example of a preferred embodiment illustrated in the accompanying drawings, in which:
Figure 1 shows a section of a ship, where a pressure vessel cassette is being lowered into the cargo hold of the ship;
Figure 2 shows a section of the ship of figure 1, where a number of pressure vessel cassettes are arranged in the cargo hold of the ship, and where one pressure vessel cassette and one partition are shown in bold; and
Figure 3 shows a plan view of a pressure vessel cassette according to figure 2.
In the drawings, reference number 1 denotes a pressure vessel cassette comprising a load-bearing trussed structure 2 with guides 4 and required fastening elements 6 for support of eight longitudinal pressure vessels 8 of a type that is known per se. The pressure vessels 8 are equipped with separate connections 10 to a common manifold 12, which in turn is connected to the ship's loading/unloading pipe 14 via a connector 16. The fastening elements 6 may be of any appropriate construction that meets the requirements for a steady connection to the cassette 1, maximum relief of the weight of the pressure vessel 8, and a fixed position relative to the manifold 12.
The cargo hold 22 of the ship 20 is provided with bulkheads 24 equipped with slides 26. The guides 4 of the cassette 1 fit the slides 26 in a complementary manner, and the guides 4 are designed to be displaced vertically along the slides 26 during loading of the cassettes 1. The slides 26 are also designed to take up horizontal forces from the cassettes 1. The cargo hold 22 of the ship 20 may be provided with hatches and/or a superstructure 23.
The pressure vessels 8 are located along the inside of the trussed structure 2 of the cassette 1. Centrally in the cassette 1 there is a longitudinal space 30 arranged so as to allow inspection access to the pressure vessels 8. The longitudinal welds 9 of the pressure vessels 8 face in towards the space 30. The pressure vessels 8 are arranged with sufficient mutual spacing and distance to the trussed structure 2 of the cassette 1 to allow inspection of the pressure vessels to be carried out through using instruments in accordance with a technique that is known per se, without having to remove the pressure vessel 8 from the cassette 1, see figure 3.
The pressure vessels are placed in and connected to the trusswork 2 of the cassette 1 by means of fastening elements 6, prior to the cassette being loaded into the ship's 20 hold 22. The manifold 12 is also connected to the connections 10 of the pressure vessels 8 before loading, which means that all testing and certification can be performed prior to the cassettes 1 leaving the place of manufacture.
For loading into the ship's 20 hold 22, the cassettes are hoisted to their vertical orientation of use and positioned over the relevant slides 26 provided in the bulkheads of the cargo hold 22. The guides 4 connected to the trussed structure 2 of the cassette 1 fit over the slides 26 in a complementary manner. After the guides 4 have been positioned over the slides 26, the cassette 1 is lowered along the slides 26 until it abuts the floor of the cargo hold 22. The manifold 12 is then connected up to the ship's 20 loading/unloading pipe 14 by means of the connector 16.
Using the pressure vessel cassette 1 according to the invention will, when compared with prior art, to a significant degree simplify manufacture, inspection and documentation of the type of pressure vessel 8 in question.

Claims

C l a i m s
A device for fastening pressure vessels (8), particularly of the type used for sea transport of pressurised petroleum products, c h a r a c t e r i s e d i n that at least two interconnected pressure vessels (8) are arranged in a cassette (1) .
A device in accordance with Claim 1, c h a r a c t e r i s e d i n that the pressure vessels (8) are connected to the cassette (1) via at least one fastening element (6).
A device in accordance with one or more of the preceding claims, c h a r a c t e r i s e d i n that the cassette (1) is slidingly connected to the bulkhead (24) of a ship (20) and designed to rest on the floor of the ship's (20) hold (22).
A device in accordance with one or more of the preceding claims, c h a r a c t e r i s e d i n that a space (30) is provided in the longitudinal direction of the cassette (1), which space is designed to provide access for personnel when inspecting the pressure vessels (8).
Method of fastening pressure vessels (8), particularly of the type used for sea transport of pressurised petroleum products, c h a r a c t e r i s e d i n that at least two pressure vessels (8) are arranged in and connected to a cassette (1) prior to placing the cassette (1) carrying the pressure vessels (8) in question in the operative position of the cassette (1) in a ship's (20) hold (22).
A method in accordance with Claim 5, c h a r a c t e r i s e d i n that a manifold (12) is sealingly connected to the pressure vessels (8), and that pressure testing is performed prior to the cassette (1) being placed in the ship (20).
A method in accordance with Claim 5 and/or 6, c h a r a c t e r i s e d i n that the cassette (1) slides vertically along slides (26) by means of guides (4) provided in the ship's (20) hold (22), whereupon the manifold (12) is connected to the ship's 20 loading/unloading pipe (14).
PCT/NO2002/000059 2001-02-13 2002-02-12 A device and method for fastening pressure vessels WO2002066316A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20010728A NO313846B1 (en) 2001-02-13 2001-02-13 Apparatus and method for attaching pressure tanks
NO20010728 2001-02-13

Publications (1)

Publication Number Publication Date
WO2002066316A1 true WO2002066316A1 (en) 2002-08-29

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ID=19912124

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NO (1) NO313846B1 (en)
WO (1) WO2002066316A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003047959A1 (en) * 2001-12-06 2003-06-12 Knutsen Oas Shipping As An arrangement at a cargo hold of a ship where the ship is designed to transport pressurised petroleum products
WO2004005793A1 (en) * 2002-07-09 2004-01-15 Knutsen Oas Shipping As A device for and a method of fixing and lifting vertically installed cargo pressure tanks in ships
WO2004080791A1 (en) * 2003-03-14 2004-09-23 Sevan Marine As A tank installation for the storage of liquids
WO2007004896A1 (en) * 2005-07-06 2007-01-11 Compressed Energy Technology As Vessel for transport of compressed natural gas
KR102718641B1 (en) 2017-11-14 2024-10-17 헥사곤 테크놀로지 에이에스 Sensor Mounting System

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803005A (en) * 1995-10-30 1998-09-08 Enron Lng Development Corp. Ship based system for compressed natural gas transport

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5803005A (en) * 1995-10-30 1998-09-08 Enron Lng Development Corp. Ship based system for compressed natural gas transport

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003047959A1 (en) * 2001-12-06 2003-06-12 Knutsen Oas Shipping As An arrangement at a cargo hold of a ship where the ship is designed to transport pressurised petroleum products
WO2004005793A1 (en) * 2002-07-09 2004-01-15 Knutsen Oas Shipping As A device for and a method of fixing and lifting vertically installed cargo pressure tanks in ships
US7128008B2 (en) 2002-07-09 2006-10-31 Knutsen Oas Shipping As Device for and a method of fixing and lifting vertically installed cargo pressure tanks in ships
WO2004080791A1 (en) * 2003-03-14 2004-09-23 Sevan Marine As A tank installation for the storage of liquids
US7207284B2 (en) 2003-03-14 2007-04-24 Sevan Marine As Tank installation for the storage of liquids
KR101190557B1 (en) 2003-03-14 2012-10-16 세반 마린 에이에스에이 A tank installation for the storage of liquids
WO2007004896A1 (en) * 2005-07-06 2007-01-11 Compressed Energy Technology As Vessel for transport of compressed natural gas
US7757621B2 (en) 2005-07-06 2010-07-20 Compressed Energy Technology A/S Vessel for transport of compressed natural gas
CN101208239B (en) * 2005-07-06 2010-12-08 压缩能源技术公司 Vessel for transport of compressed natural gas
KR102718641B1 (en) 2017-11-14 2024-10-17 헥사곤 테크놀로지 에이에스 Sensor Mounting System

Also Published As

Publication number Publication date
NO313846B1 (en) 2002-12-09
NO20010728D0 (en) 2001-02-13
NO20010728L (en) 2002-08-14

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