JP2554801B2 - Double Hull Ballast Tank Element - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a double hull ballast tank element for ships.

[0002]

BACKGROUND OF THE INVENTION Single hull ships are commonly used to carry liquid cargo such as gasoline, crude oil and various other liquid chemicals. If the hull is destroyed in an accident, leakage of liquid into the surrounding sea can cause pollution.

Various schemes have been proposed to minimize the risk of leaks from oil carriers. Usually, the solution is in the double hull type ship, because accidents prevents leakage of liquid cargo the outer ship structure also <br/> inner hull damage the shell is held in the their Is .

[0004]

THE INVENTION Problems to be Solved] However, the single-hull type ship
Since the center of gravity of the double hull type ship than the center of gravity is higher due, the double hull type ship no longer have an adverse stability, even if the compartments of the double hull type ship was destroyed just a little bit, The resulting load imbalance can cause the ship to capsize and the entire ship can be lost.

[0005]

SUMMARY OF THE INVENTION The present invention does not compromise the entire ship (survivability) when damaged (surviva).
purpose ) to provide a double-hull ship
It The residual patency results from a novel ballast tank elements,
Each ballast tank element is (a) tank inspection trunk (t
a half-width double bottom ballast tank ("J" shaped unit) having an ank access trunk );
(B) It has a side ballast tank (“S” shaped unit) positioned in the double hull. The tank inspection trunk of the "J" shaped unit is positioned within the double side of the hull and the side ballast tank is next to the tank inspection trunk. Tank inspection trunk may have at least one frame space width. Preferably, at least a pair of ballast tank elements are used, these elements being adjacent and facing each other. These pairs of ballast tank elements can be used with dual hull ballast tank elements ("U" shaped units) that do not have internal subdivisions.

[0006]

[Effect of the Invention] An advantage of this arrangement is that it all including both the inner hull and outer hull at the same time as the cargo tank body Holding the stability acceptable in wholesale loading and the product of cargo and ballast water Provides survivability in the damaged state. This is a more general configuration of the present invention, "L, L, L, L,
2A to be compared with the configuration of the “L, L, L, L” type arrangement.
To (d) of FIG. 7.

[0007] Good inspection and ventilation of all ballast tanks, resulting et is without the need for the provision of inspection trunk to the double bottom of the through cargo tanks.

In this specification, different types of ballast tanks ("L" type, "J" type, "S" type and "U" type) are considered. The "L" shaped unit is a ballast tank located in the double hull and having its inward boundary at the center of the ship and its outward boundary at the upper deck level (see (d) of Figure 1). Shown). The "J" type unit is a half-width double bottom ballast tank with a tank inspection trunk (shown in Figures 1a and 1c).
"S" shaped unit is a side ballast tanks positioned double vessel inner shell, is close to the tank inspection preparative <br/> rank "J" shaped units ((a) and the diagram of FIG 1 1 (c)
Shown in). The "U" shaped unit is a double hull ballast tank without internal subdivisions (shown in Figure 1 (b)).

To facilitate understanding of the present invention,
Reference is made to the accompanying drawings of a preferred embodiment of the present invention. The drawings are for illustration purposes only and should not be construed as limiting the invention.

[0010]

EXAMPLES The present invention is a double bottom ballast tanks of the half width having a tank inspection trunk (the "J" shaped units), the side ballast tanks positioned double vessel inner shell ( "S"
Form unit) and a new ballast tank element. Tank inspection trunk "J" shaped unit is positioned inside double side hull in proximity to "S" shaped unit. Together, the "J" type unit and the "S" type unit are ballast tank elements ("J / S") that are novel to the present invention.
Form elements).

"J" Type Unit The "J" type unit is a half width dual bottom ballast tank with a tank inspection trunk. "Half width" means half the width (or width) of a ship. "Double bottom" means the space enclosed by the inside and outside bottoms of the ship.
"Ballast Tank" means a tank used only to carry water ballast.

The tank inspection trunk is positioned within the double side of the hull proximate to the "S" shaped unit. "tank
" Inspection trunk" means a watertight enclosure extending from the upper deck and containing a ladder. "Double sides of hull" means the space enclosed between the inside and outside sides of a ship. Preferably, the tank inspection trunk has a width of at least one frame spaces. "One frame space" means the space extending between one transverse web frame and the next front or rear transverse web frame.

"S" Type Unit The "S" type unit is a side ballast tank positioned in the double hull and close to the tank inspection trunk of the "J" type unit. "Side ballast tank" means a ballast tank that is generally positioned within the double side and extends from the upper deck to the inner bottom level.

"J / S" shaped unit Together, the "J" shaped unit and the "S" shaped unit form a "J / S" shaped element that takes up the same space as a conventional "L" shaped unit. Preferably, these "J / S" type ballast tank elements are used in pairs, where the elements are closely adjacent to each other.

"U" Type Units A pair of "J / S" type units can be used with dual hull ballast tank elements that do not have internal subdivisions ("U" type units). "No internal subdivision"
It is to mean that no longitudinal watertight dividing the interior of the tank.

Although the present invention has been described in relation to particular embodiments, it is intended that the invention cover various modifications and substitutions which can be made by those skilled in the art without departing from the spirit and scope of the claims. To be done.

[Brief description of drawings]

FIG. 1 (a) is a semi-width double bottom ballast tank (“J” type unit) and side ballast tank (“S”).
Schematic of the ballast tank element of the invention with a shaped unit). (B) is a cross-sectional view of a "U" shaped unit. (C) is a cross-sectional view of a "J" type unit and an "S" type unit. (D) is a cross-sectional view of the "L" -shaped unit.

FIG. 2 is in the full load condition "L, L, L, L, L, L,
FIG. 5 is a schematic diagram of computer simulation results showing the limit of survivability of a double hull design with “L, L” configuration.

[Fig. 3] "U, U, U, U, J / S, in full load state"
FIG. 3 is a schematic diagram of computer simulation results showing the limits of survivability and different degrees of bottom damage for a double hull design with a “U, J / S, U” configuration.

[Fig. 4] "U, U, U, U, J / S, in full load state"
FIG. 3 is a schematic diagram of computer simulation results showing the limits of survivability and different degrees of bottom damage for a double hull design with a “U, J / S, U” configuration.

[Fig. 5] "U, U, U, U, J / S, in full load state"
FIG. 3 is a schematic diagram of computer simulation results showing the limits of survivability and different degrees of bottom damage for a double hull design with a “U, J / S, U” configuration.

[Fig. 6] "U, U, U, U, 40% unloaded state"
FIG. 5 is a schematic diagram of computer simulation results showing the limit of survivability and different degrees of bottom damage for a double hull design with a “J / S, U, J / S, U” configuration.

[Fig. 7] "U, U, U, U, 40% unloaded state"
FIG. 5 is a schematic diagram of computer simulation results showing the limit of survivability and different degrees of bottom damage for a double hull design with a “J / S, U, J / S, U” configuration.

[Explanation of symbols]

 J “J” type unit L “L” type unit S “S” type unit U “U” type unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-30678 (JP, A) Actually developed 48-61594 (JP, U)

Claims (4)

(57) [Claims] 1. A double hull type ship having at least one ballast tank elements, (a) has a tank inspection trunk, the tank inspection trunk <br/> click the hull double the side A double vessel including a semi-width double bottom ballast tank positioned at the bottom, and (b) a side ballast tank positioned in the double hull and adjacent to the tank inspection trunk. Shell boat. 2. A double-hull vessel according to claim 1, wherein the tank inspection trunk has at least one frame space width. 3. A double-hull vessel as set forth in claim 1 including at least one pair of said ballast tank elements, said elements being in close proximity and facing each other. 4. The double-hull type according to claim 3, comprising: (a) at least one pair of the ballast tank elements and (b) a double-hull ballast tank element having no internal subdivision. ship.