EP0856464A1 - Verfahren zur Umwandlung eines Einzelrumpfschiffes in ein Doppelrumpfschiff - Google Patents

Verfahren zur Umwandlung eines Einzelrumpfschiffes in ein Doppelrumpfschiff Download PDF

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Publication number
EP0856464A1
EP0856464A1 EP97300560A EP97300560A EP0856464A1 EP 0856464 A1 EP0856464 A1 EP 0856464A1 EP 97300560 A EP97300560 A EP 97300560A EP 97300560 A EP97300560 A EP 97300560A EP 0856464 A1 EP0856464 A1 EP 0856464A1
Authority
EP
European Patent Office
Prior art keywords
hull
vessel
conversion
section
shell
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.)
Withdrawn
Application number
EP97300560A
Other languages
English (en)
French (fr)
Inventor
Prabhakaran A/L E K c/o Pasir Gudang Menon
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.)
Malaysia Shipyard & Engineering Sdn Bhd
Original Assignee
Malaysia Shipyard & Engineering Sdn Bhd
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 Malaysia Shipyard & Engineering Sdn Bhd filed Critical Malaysia Shipyard & Engineering Sdn Bhd
Priority to EP97300560A priority Critical patent/EP0856464A1/de
Publication of EP0856464A1 publication Critical patent/EP0856464A1/de
Withdrawn legal-status Critical Current

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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 
    • B63B83/00—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems
    • B63B83/10—Rebuilding or retrofitting vessels, e.g. retrofitting ballast water treatment systems for increasing cargo capacity

Definitions

  • This invention relates to a method of conversion of a single hull vessel to a double hull vessel.
  • the method of conversion of a vessel may use a ship-lift system; alternatively, the method may be carried out in a dry dock.
  • the section of second hull shell is lowered on a lifting means and the vessel is positioned above the lifting means.
  • the lifting means may thereafter be raised to bring the section of second hull shell into a position adjacent the first hull of the vessel.
  • the locating of the section of second hull shell in relation to the first hull may be by means of a locating means such as male and female locating members disposed on adjacent portions of the first and second hulls.
  • the lifting means lifts the combined vessel and section of second hull to a site for addition of remaining sections of the second hull and treatment.
  • the second hull shell has transverse ribs for providing strength to the double hull.
  • the first hull may be an existing outer hull of a vessel, said vessel being converted to a double hull vessel.
  • ballast tanks can be placed within the second hull.
  • Existing ballast tanks within the first hull may be converted to cargo tanks.
  • a method of conversion of a vessel is described, in particular for adding a second hull 4 to a vessel 1 with a single existing hull 2 (see Fig. 3 and Figs. 9a and 9b).
  • the method can be used in a dry dock or by using a ship-lifting system.
  • the ship-lifting system has the advantage of a quicker assembly time thereby being advantageous to shipowners who have their ships out of service for a shorter period.
  • the method involves the following steps.
  • the vessel 1 is identified for conversion to a double hull vessel and all the key drawings for the vessel 1 are obtained from the shipowner or drawn up to provide details of the general arrangement and construction profile, the shell expansion, capacity plan, lines and offset and the piping arrangement.
  • the vessel 1 may need to be brought to the shipyard for detailed checking of the vessel profile and to verify all critical dimensions.
  • the main bottom section of second hull 4, side sections 18 and end sections 20 are fabricated as steel structures based on the drawings (see Figs. 4a. 4b and 8b).
  • the bottom section of second hull 4 has sets of female locating members 8 attached to correspond with male locating members 6 on the vessel 1.
  • Corresponding male locating members 6 (See Fig. 2) are added to the exterior of the existing first hull 2 of the vessel 1.
  • the male and female locating members 6, 8 facilitate precise positioning of the bottom section of second hull 4 in relation to the first hull 2 of the vessel 1.
  • the bottom section of second hull 4 has parallel transverse ribs 10 normal to the direction of the keel 22 of the vessel 1.
  • the ribs 10 strengthen the section of the second hull 4 and provide rigidity (see Fig. 1).
  • the side sections of second hull 18 are hollow blocks and the end sections of second hull 20 are tapered hollow blocks (see Fig. 8b).
  • New pipes and other fittings are prefabricated for fitting in new double bottom tanks which will be ballast tanks between the first and second hulls 2, 4. Any original ballast tanks within the first hull 2 of the bottom vessel 1 are converted to cargo tanks.
  • the sections 18, 20 of the second hull 4 are blasted and painted. This completes the preparation that can be carried out without having the vessel 1 out of commission (see Figs. 4a, 4b and 8b).
  • the vessel 1 is docked and lifted by a ship lift 12 and transferred to a land berth.
  • the vessel 1 could be docked in a dry dock (see Fig. 6a).
  • the existing external shell 19 of the first hull 2 of the vessel 1 is completely blasted and painted with a primer (see Fig. 9a and 9b).
  • the male locating members 6 are fitted onto the bottom plate of the first hull 2 of the vessel 1.
  • the vessel 1 is transferred from the land berth to the ship lift platform, lowered and floated. Alternatively, if the dry dock system is being used, the vessel 1 is floated and removed from the dry dock.
  • the main bottom section of second hull 4 which has been prefabricated as described above, is assembled on the land berth over suitable cradles and bogies.
  • the section of second hull 4 is transferred to the platform 14 of the ship lift 12 and the platform 14 is lowered into the sea (see Figs. 4a and 4b).
  • the vessel 1 is docked over the platform 14 of the ship lift 12 ensuring sufficient clearance between the vessel's first hull 2 and the section of second hull 4 on the platform 14.
  • the platform 14 is then raised by the ship lift 12 so that the male locating members 6 on the first hull 2 fit accurately into the female locating members 8.
  • the section of second hull 4 is supported on blocks.
  • the dry dock can be flooded in order to allow the vessel 1 to be positioned over the second hull 4.
  • the dry dock can be drained for further work on the vessel 1 as described below.
  • first hull 2 and the interior of the bottom section of second hull 4 are thoroughly washed with fresh water and the first and second hulls 2, 4 are welded together.
  • a number, in this example four, of side sections of second hull 18 in the form of hollow blocks having a double skin shell structure are positioned on each side of the vessel 1 adjacent the first hull 2 and above the bottom section of the second hull 4, by yard cranes (see Figs. 6a and 6b).
  • End sections 20 of the second hull 4 are also positioned on the vessel 1 and these have a tapered profile at the forward and aft ends of the vessel 1 in order to ensure that the first hull 2, bottom section of second hull 4 and side sections 18 of second hull 4 are jointed smoothly.
  • the vessel 1 with its double hull is transferred to the platform 14 of the ship lift 12 and lowered into the sea. If the dry dock system is being used, the dry dock is flooded and the vessel 1 floated (see Fig. 7b).
  • the entire vessel systems are tested and a sea trial conducted.
  • the resulting double hull vessel has a first hull 2 which is the existing hull of the vessel 1, with a bottom section of second hull 4 located to the first hull 2 by male and female locating members 6, 8 between the two, the second hull is then attached by welding.
  • a number of double skinned side sections 18 of second hull 4 are disposed along the sides of the vessel 1 with tapered end sections 20 of second hull 4 at each forward and aft position.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
EP97300560A 1997-01-29 1997-01-29 Verfahren zur Umwandlung eines Einzelrumpfschiffes in ein Doppelrumpfschiff Withdrawn EP0856464A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97300560A EP0856464A1 (de) 1997-01-29 1997-01-29 Verfahren zur Umwandlung eines Einzelrumpfschiffes in ein Doppelrumpfschiff

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97300560A EP0856464A1 (de) 1997-01-29 1997-01-29 Verfahren zur Umwandlung eines Einzelrumpfschiffes in ein Doppelrumpfschiff

Publications (1)

Publication Number Publication Date
EP0856464A1 true EP0856464A1 (de) 1998-08-05

Family

ID=8229197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97300560A Withdrawn EP0856464A1 (de) 1997-01-29 1997-01-29 Verfahren zur Umwandlung eines Einzelrumpfschiffes in ein Doppelrumpfschiff

Country Status (1)

Country Link
EP (1) EP0856464A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102745307A (zh) * 2012-06-29 2012-10-24 深圳市海斯比船艇科技股份有限公司 船艇的制造方法及使用该方法制造的船艇

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978807A (en) * 1974-03-16 1976-09-07 Aktiengesellschaft "Weser" Offshore station and method of maintaining the same
JPH03159895A (ja) * 1989-11-20 1991-07-09 Ishikawajima Harima Heavy Ind Co Ltd タンカーの船体改造方法
WO1992010396A1 (en) * 1990-12-05 1992-06-25 William Stuart Watercraft hull modification
US5189975A (en) * 1992-05-01 1993-03-02 Mobil Oil Corporation Method for reconfiguration tankers
WO1994026585A1 (en) * 1993-05-18 1994-11-24 Special Projects Research Corp. Method and device for the installation of double hull protection

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978807A (en) * 1974-03-16 1976-09-07 Aktiengesellschaft "Weser" Offshore station and method of maintaining the same
JPH03159895A (ja) * 1989-11-20 1991-07-09 Ishikawajima Harima Heavy Ind Co Ltd タンカーの船体改造方法
WO1992010396A1 (en) * 1990-12-05 1992-06-25 William Stuart Watercraft hull modification
US5189975A (en) * 1992-05-01 1993-03-02 Mobil Oil Corporation Method for reconfiguration tankers
WO1994026585A1 (en) * 1993-05-18 1994-11-24 Special Projects Research Corp. Method and device for the installation of double hull protection

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 015, no. 393 (M - 1165) 4 October 1991 (1991-10-04) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102745307A (zh) * 2012-06-29 2012-10-24 深圳市海斯比船艇科技股份有限公司 船艇的制造方法及使用该方法制造的船艇
CN102745307B (zh) * 2012-06-29 2015-02-18 深圳市海斯比船艇科技股份有限公司 船艇的制造方法

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