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EP-4129814-B1 - LIQUEFIED GAS STORAGE SHIP

EP4129814B1EP 4129814 B1EP4129814 B1EP 4129814B1EP-4129814-B1

Inventors

  • URAGUCHI, Ryosuke
  • KAWASUJI, Yusaku
  • IZUMI, Naruyoshi
  • IMAI, TATSUYA
  • SHIMOGAKI, Takashi
  • MATSUMOTO, AKIRA

Dates

Publication Date
20260506
Application Date
20210329

Claims (5)

  1. A liquefied gas storage ship (1) comprising: a hull (3); a tank (5) that is installed in the hull (3) and stores liquefied gas, the tank (5) including a dome part (13) protruding upward; a pipe (7) extending from an inside of the tank (5) through the dome part (13) to an outside of the tank (5); and a support structure body (9) that is fixed to the dome part (13) and supports a portion (7a) of the pipe (7) extending to the outside of the tank (5), characterized in that the support structure body (9) includes: an attachment part (9a) which is located at a lowermost part of the support structure body (9) and is fixed to the dome part (13), a mount part (9b) of a flat plate-like shape which is located at an uppermost part of the support structure body (9) and on which the portion (7a) of the pipe (7) extending to the outside of the tank (5) is mounted, and a support part (9c) which is located between the attachment part (9a) and the mount part (9b) to connect and support the mount part (9b) with respect to the attachment part (9a).
  2. The liquefied gas storage ship as claimed in claim 1, wherein at least a portion (9a) of the support structure body (9) which is fixed to the dome part (13) is made of low temperature steel.
  3. The liquefied gas storage ship as claimed in claim 1 or 2, wherein the support structure body (9) has a truss structure at least in part.
  4. The liquefied gas storage ship as claimed in any one of claims 1 to 3, wherein the mount part (9b) includes a region protruding with respect to the dome part (13) in a plan view.
  5. The liquefied gas storage ship as claimed in any one of claims 1 to 4, wherein the mount part (9b) is formed with an insertion opening (33) through which the pipe (7) is inserted.

Description

CROSS REFERENCE TO THE RELATED APPLICATION This application is based on and claims Convention priority to Japanese patent application No. 2020-061456, filed March 30, 2020. BACKGROUND OF THE INVENTION (Field of the Invention) The present invention relates to a liquefied gas storage ship, which is a ship having function of storing liquefied gases. (Description of Related Art) In conventional liquefied gas storage ships (for example, liquefied gas carrier ships) that stores liquefied gases such as liquefied natural gas or liquefied hydrogen, pipes such as liquefied gas transport pipes are collectively mounted to a dome part, which protrudes upward from a tank body, inside a tank and penetrate the dome part to extend to an outside of the tank (see, for example, Patent Document 1.). Generally, the portion of the pipes extending outside the tank is supported by a support structure body attached to a hull such as a tank cover. Patent Document 2 discloses a liquefied gas carrier tank that includes a tank main body portion and a tank dome to which a plurality of pipes are attached through which a liquefied gas is supplied to and discharged from the tank main body portion. [Related Document] [Patent Document] [Patent Document 1] JP Laid-open Patent Publication No. 2019-157868[Patent Document 2] European Patent No. 2682337 SUMMARY OF THE INVENTION However, where the support structure body is fixed to the hull rather than to the tank, large relative displacement occurs between a leading portion of the transport pipe on the tank side and the support structure body for the transport pipe on the hull side due to deformation and/or rocking motion of the hull, expansion and contraction of the tank caused by the storage of low-temperature liquefied gas, and the like. Such large relative displacement will cause bending stress to be applied to the pipe. In order to solve the above problem, an object of the present invention is to suppress relative displacement between a pipe penetrating a dome part of a tank and a structure body supporting the pipe in a liquefied gas storage ship. In order to achieve the above object, the present invention provides a liquefied gas storage ship including: a hull;a tank that is installed in the hull and stores liquefied gas, the tank including a dome part protruding upward;a transport pipe for transporting the liquefied gas between an inside and an outside of the tank, the transport pipe extending from the inside of the tank through the dome part to the outside of the tank; anda support structure body that is fixed to the dome part and supports a portion of the transport pipe extending to the outside of the tank, wherein the support structure body includes: an attachment part which is located at a lowermost part of the support structure body and is fixed to the dome part, a mount part of a flat plate-like shape which is located at an uppermost part of the support structure body and on which the portion of the pipe extending to the outside of the tank is mounted, and a support part which is located between the attachment part and the mount part to connect and support the mount part with respect to the attachment part. According to this configuration, the support structure body that supports the pipe is mounted to the dome part of the tank to which the pipe is attached. Therefore, relative displacement between the pipe and the support structure body can be significantly suppressed, as compared with the case where the support structure body is mounted to the tank cover or the like of the hull. BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be more clearly understood from the following description of preferred embodiments thereof, when taken in conjunction with the accompanying drawings. However, the embodiments and the drawings are given only for the purpose of illustration and explanation, and are not to be taken as limiting the scope of the present invention in any way whatsoever, which scope is to be determined by the appended claims. In the accompanying drawings, like reference numerals are used to denote like or corresponding parts throughout the several views. In the figures, Fig. 1 is a side view schematically showing a configuration of a liquefied gas storage ship according to one embodiment of the present invention;Fig. 2 is a cross-sectional view along line II-II in Fig. 1;Fig. 3 is a cross-sectional view showing a surrounding area of the dome part of Fig. 2 in an enlarged scale; andFig. 4 is a plan view showing a support structure body used in the liquefied gas storage ship shown in Fig. 1. DESCRIPTION OF THE EMBODIMENTS Hereinafter, one preferable embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a liquefied gas storage ship 1 according to one embodiment of the present invention. The liquefied gas storage ship 1 includes a hull 3 that floats on water, a tank 5 that is installed in the hull 3 for storing liquefied gas, a pip