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KR-20260065095-A - LIQUEFIED GAS STORAGE TANK WITH SUMP WELL

KR20260065095AKR 20260065095 AKR20260065095 AKR 20260065095AKR-20260065095-A

Abstract

A liquefied gas storage tank having a sump well is disclosed. According to one aspect of the present invention, a liquefied gas storage tank comprising a tank portion, a filling line and a discharge line extending into the tank portion and used for unloading liquefied gas, and a fuel gas line extending into the tank portion and connected to a fuel gas pump disposed in a sump well formed on the bottom surface of the tank portion, may be provided, wherein the liquefied gas storage tank further comprises a branch line branched from the filling line and extending into the sump well.

Inventors

  • 진종운
  • 김봉준
  • 권기정

Assignees

  • 삼성중공업 주식회사

Dates

Publication Date
20260508
Application Date
20241031

Claims (5)

  1. A liquefied gas storage tank comprising: a tank section; a filling line and a discharge line extending into the tank section and used for unloading liquefied gas; and a fuel gas line extending into the tank section and connected to a fuel gas pump disposed in a sump well formed on the bottom surface of the tank section. A liquefied gas storage tank further comprising a branch line branched from the above charging line and extending into the above sump well.
  2. In paragraph 1, The gas injected into the above branch line is a liquefied gas storage tank that is directly supplied to the above sump well.
  3. In paragraph 1, A liquefied gas storage tank in which warm-up gas is injected into the tank section through the filling line and the branch line.
  4. In paragraph 3, A liquefied gas storage tank in which inert gas is injected into the above tank section through the above branch line.
  5. In paragraph 4, The above branch line is a liquefied gas storage tank that remains closed while liquefied gas is injected through the above charging line.

Description

Liquefied gas storage tank with sump well The present invention relates to a liquefied gas storage tank equipped with a sump well. Liquefied natural gas (LNG) refers to a colorless, transparent, ultra-low temperature liquid produced by cooling natural gas to approximately -162°C to reduce its volume to about one-six hundredth of its original size. As natural gas is used as an important energy source, research on LNG carriers capable of transporting liquefied natural gas by sea from production bases to demand centers or receiving centers is actively underway. LNG carriers are equipped with liquefied gas storage tanks capable of storing liquefied natural gas at ultra-low temperatures. A liquefied gas storage tank may be equipped with a filling line, a discharging line, and an emergency line for unloading liquefied natural gas, as well as a fuel gas line for using the liquefied natural gas stored in the storage tank as ship fuel. A fuel gas pump for sucking in liquefied natural gas is installed at the bottom of the fuel gas line. In addition, a sump well can be formed below the fuel gas pump in the liquefied gas storage tank to ensure the operational performance of the fuel gas pump. For example, the installation of a sump well can improve issues such as pump suction failure caused by sloshing. Meanwhile, liquefied gas storage tanks are generally inspected regularly every 3 to 5 years. At this time, in order to create an environment where workers can enter the tank, operations such as warm-up, inerting, and aeration are performed after the liquefied natural gas stored in the liquefied natural gas storage tank is discharged. However, due to the structural characteristics of the sump well, there was a problem where the liquefied natural gas inside the sump well did not vaporize and remained, or even if it did vaporize, gas freeing was not properly carried out. Conventionally, methods such as extending the warm-up time were used to solve this problem, but this resulted in time and financial losses, and even if the warm-up time was extended, gas freeing was not reliably guaranteed, posing a possibility of safety accidents caused by residual gas when workers entered. FIG. 1 is a drawing of a liquefied gas storage tank equipped with a sump well according to an embodiment of the present invention, and Figures 2 to 4 are various operational examples of Figure 1. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The attached drawings are not drawn to the actual scale to aid in understanding the invention, and the dimensions of some components may be exaggerated. Terms used in the specification and claims of the present invention should not be limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. In this specification, the singular form shall be deemed to include the plural form unless otherwise specifically stated. In addition, if it is stated that a part "includes" a certain component, it means that the part may include additional components. In addition, when a component is described as "up," it refers to the area above or below the component, and does not necessarily mean that it is located on the upper side relative to the direction of gravity. In addition, where it is stated that a component is "connected" or "combined" to another component, this may include not only cases where the component is directly connected or combined to the other component, but also cases where the component is indirectly connected or combined through another component. In addition, terms such as "first," "second," etc., may be used to describe a component; however, these terms are intended merely to distinguish the component from other components and are not intended to limit the essence, order, or sequence of the component. FIG. 1 is a drawing of a liquefied gas storage tank equipped with a sump well according to an embodiment of the present invention. Referring to FIG. 1, a liquefied gas storage tank (10) equipped with a sump well according to an embodiment of the present invention may include a tank section (100), a filling line (110), a discharge line (120), a fuel gas line (130), and a branch line (140). The tank section (100) can provide a storage space for liquefied gas, for example, liquefied natural gas. A sump well (101) in the shape of a recessed part of the bottom surface of the tank section (100) may be formed. The charging line (110), the discharge line (120), and the fuel gas line (130) can be extended from outside the tank section (100) into the tank section (100). The filling line (110) and the discharge line (120) may be pipelines used for unloading liquefied gas. Specifically, the charging line (110) can be used