KR-20260062542-A - LEAK AND OUTGASSING INSPECTION SYSTEM AND METHOD

KR20260062542AKR 20260062542 AKR20260062542 AKR 20260062542AKR-20260062542-A

Abstract

A leak and outgassing inspection system according to an embodiment of the present invention may include: a vacuum transmitter configured to measure the pressure of the insulation space of a double wall of a liquefied gas storage tank; a vacuum pump mounted on a vacuum pipe connected to the insulation space of the double wall of the liquefied gas storage tank and configured to operate when the pressure of the insulation space measured by the vacuum transmitter rises above a set pressure; and a judgment unit that analyzes the components of a gas sampled during the operation of the vacuum pump and determines whether the cause of the pressure rise in the insulation space is either a leak of the double wall or outgassing based on the analyzed result.

Inventors

김수현
유병용
곽정민
유지헌
장준혁
손희창

Assignees

에이치디한국조선해양 주식회사
에이치디현대중공업 주식회사
에이치디현대삼호 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (10)

A vacuum transmitter configured to measure the pressure in the insulation space of the double wall of a liquefied gas storage tank; A vacuum pump mounted on a vacuum pipe connected to the insulation space of the double wall of the above-mentioned liquefied gas storage tank, configured to operate when the pressure of the insulation space measured by the vacuum transmitter rises above the set pressure; and A leak and outgassing inspection system comprising: a judgment unit that analyzes the components of a sampled gas during the operation of the above vacuum pump and determines, based on the analyzed results, whether the cause of the pressure rise in the insulation space is a leak or outgassing of the double wall.
In claim 1, A leak and outgassing inspection system in which a sampling unit for sampling gas is positioned at least one upstream and downstream of the vacuum pump.
In claim 1, The above judgment unit is configured to detect whether a judgment gas exists in the sampled gas, and The above-mentioned judgment gas is a leak and outgassing inspection system in which the gas has a relatively low freezing point.
In claim 3, A leak and outgassing inspection system configured such that when a judgment gas is present in the sampled gas, the judgment unit determines that the cause of the pressure rise in the insulation space is a leak in the outer wall of the double wall.
In claim 3, A leak and outgassing inspection system configured such that when no judgment gas is present in the sampled gas, the judgment unit determines that the cause of the pressure rise in the adiabatic space is outgassing.
While liquefied gas is stored in the storage space of a liquefied gas storage tank, the pressure in the insulation space of the double wall of the liquefied gas storage tank is measured, and When the pressure in the above-mentioned insulation space rises above the set pressure, the gas in the above-mentioned insulation space is sampled by operating the vacuum pump, and A leak and outgassing inspection method that analyzes a sampled gas and determines, based on the analyzed results, whether the cause of the pressure rise in the insulation space is a double wall leak or outgassing.
In claim 6, A leak and outgassing inspection method for sampling gas at at least one of the upstream and downstream of the above vacuum pump.
In claim 6, Detect whether a judgment gas is present in the sampled gas, and The above-mentioned judgment gas is a leak and outgassing inspection method in which the gas has a relatively low freezing point.
In claim 8, A leak and outgassing inspection method that determines that the cause of the pressure rise in the insulation space is a leak in the outer wall of the double wall when a judgment gas is present in the sampled gas.
In claim 8, A leak and outgassing inspection method that determines that the cause of the pressure rise in the adiabatic space is outgassing when no judgment gas is present in the sampled gas.

Description

Leak and Outgassing Inspection System and Method The present invention relates to a leak and outgassing inspection system and an inspection method thereof, and more specifically, to a leak and outgassing inspection system and an inspection method thereof capable of determining leaks and outgassing by analyzing gas components sampled when pressure is generated in the double wall of a liquefied gas storage tank. As is well known, a liquefied gas storage tank includes a double wall that defines a storage space for storing liquefied gases with low temperatures, such as liquid hydrogen (-253°C), and the double wall is composed of a high-performance vacuum insulation structure to stably maintain the temperature of the liquefied gas and prevent loss. Liquefied gas storage tanks can minimize Boil-Off Gas (BOG) naturally generated during use or maintain a low Boil-Off Rate (BOR) through a vacuum insulation structure. The vacuum insulation structure of a liquefied gas storage tank can be manufactured by filling a double-wall jacketed insulation space with powdered insulating materials, such as glass bubbles or perlite, and maintaining it at a vacuum pressure of a certain level. Powdered insulating materials exhibit high thermal insulation performance by blocking heat transfer caused by radiation and convection. If outgassing occurs, where moisture or gaseous components are released to the outside from the insulation space of a double-walled liquefied gas storage tank, or if a leak occurs from the outer wall, the pressure in the insulation space increases, which may degrade the insulation performance of the liquefied gas storage tank. However, existing leak detection methods had the disadvantage of being unable to accurately distinguish whether the cause of the pressure rise in the insulated space was outgassing or a leak in the outer wall. Consequently, the inability to accurately identify or determine the cause of the pressure rise in the insulated space prevented proper follow-up treatment of the double walls of liquefied gas storage tanks and resulted in the inability to reliably ensure the quality of the double walls. The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. FIG. 1 is a drawing illustrating a leak and outgassing inspection system according to an embodiment of the present invention. FIG. 2 is a flowchart illustrating a leak and outgassing inspection method according to an embodiment of the present invention. Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the embodiments of the present invention, if it is determined that a detailed description of related known components or functions would hinder understanding of the embodiments of the present invention, such detailed description is omitted. In describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are used merely to distinguish the components from other components, and the essence, order, or sequence of the components is not limited by the terms used. In an embodiment of the present invention, the singular form may include the plural form unless specifically mentioned in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C. And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly connected, combined, or connected to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component. Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consisten