A method and an arrangement for reducing the weight and optimizing the longitudinal strength of a water-craft

A technology of longitudinal strength and ships, applied in ship construction, ship design, ship parts, etc., can solve the problems of increasing ship weight, disadvantages, etc., and achieve the effect that is beneficial to management

Inactive Publication Date: 2005-07-20
STX FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

From a manufacturing technology point of view, this method is disadvantageous and substantially increases the weight of the vessel

Method used

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  • A method and an arrangement for reducing the weight and optimizing the longitudinal strength of a water-craft
  • A method and an arrangement for reducing the weight and optimizing the longitudinal strength of a water-craft
  • A method and an arrangement for reducing the weight and optimizing the longitudinal strength of a water-craft

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Embodiment Construction

[0024] In Figures 1a and 1b, reference numeral 1 denotes a vessel (or water craft). The figures also show the hull 2 ​​and deck 3 of the vessel, and the cargo tanks 4 each covered by a protective hull structure 6 . Furthermore, in this case the deckhouse 5 is shown located at the stern of the vessel 1 . The upper part of the cargo tank comprises an extension 13 in which all piping components of the cargo tank are arranged (not shown more precisely). The lower part of the hull is indicated with reference number 14 .

[0025] Figures 2a and 2b show an advantageous embodiment of the structure according to the invention, in which a continuous protective shell structure 6 is arranged above the hull 2 ​​and deck 3 of the vessel, which is formed by hemispherical elements 4a and 4b The spherical cargo tank 4 provides an integral covering. Furthermore, the figure shows a deckhouse 5 located at the stern of the vessel 1, from which deckhouse, above the protective shell structure 6 an...

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Abstract

A method and arrangement for reducing the weight and optimizing the longitudinal strength of a water-craft (1), which is especially suitable for transportation of liquefied natural gas (LNG) or other corresponding mediums and comprises a hull (2), which has a deck (3) extending over at least the main part of the water-craft (1) and a number of substantially spherical cargo tanks (4) arranged successively in the longitudinal direction (A) of the water-craft (1) and a deckhouse (5), which extend substantially above the said deck (3). The hull (2) of the water-craft (1) is provided with a continuous protective casing structure (6) known as such and which is arranged on top of the cargo tanks (4). The said deck (3) of the water-craft is arranged on the hull (2) so that the proportion of its height measured from the bottom of the water-craft to the height of the uppermost continuous portion of the protective casing structure (6) on top of the cargo tanks (4) is at most 0.55, preferably at most 0.5. In addition said protective casing structure (6) is fixed to said deck (3) and/or other structures (7) supported to the hull (2) and is dimensioned together with the other parts of the hull (2) so that together they constitute an essential part of the overall strength of the water-craft.

Description

technical field [0001] The invention relates to a method for reducing weight and optimizing the longitudinal strength of a vessel according to the preamble of claim 1 , and a structure for applying the method according to the preamble of claim 4 . Background technique [0002] The hull of a ship is long and is exposed to various types of stresses such as twisting and bending caused by forces exerted on the hull such as its own weight, cargo, water buoyancy, wave action, swells caused by the sea, etc. Forces such as splashing from waves and the movement of ships in the ocean. Thus, the hull of a vessel resembles a long beam which must have certain strength properties throughout its length due to its tendency to bend, snap and twist. So the hull must allow for the bending moments, twisting and so-called shear forces it experiences, in other words longitudinal strength is the most fundamental strength characteristic of the hull of a vessel. Since the hull of a vessel is elong...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B25/08B63B3/16B63B15/00B63B25/16
CPCB63B3/16B63B25/16B63B15/00B63B2025/087B63B71/00B63B25/12
Inventor M·林德霍尔姆A·佩尔基厄J·西伦
Owner STX FINLAND OY
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