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JP2019158140A - Method for replacing gas in gas piping - Google Patents

Method for replacing gas in gas piping Download PDF

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Publication number
JP2019158140A
JP2019158140A JP2019029449A JP2019029449A JP2019158140A JP 2019158140 A JP2019158140 A JP 2019158140A JP 2019029449 A JP2019029449 A JP 2019029449A JP 2019029449 A JP2019029449 A JP 2019029449A JP 2019158140 A JP2019158140 A JP 2019158140A
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gas
replacement
pipe
inflow
valve
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JP7563873B2 (en
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宗晶 徳冨
Muneaki Tokutomi
宗晶 徳冨
康治 岩本
Yasuharu Iwamoto
康治 岩本
賢吾 頼定
Kengo Yorisada
賢吾 頼定
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Chugoku Electric Power Co Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/07—Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D1/00—Pipe-line systems
    • F17D1/02—Pipe-line systems for gases or vapours
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Pipeline Systems (AREA)

Abstract

【課題】ガスの置換を短時間に行うことが可能な、ガス配管内のガス置換方法を提供する。【解決手段】本発明のガス配管１内のガス置換方法は、両端が開閉可能で、ベント管２０がベントバルブＶＶを介して接続され、且つ置換ガス流入管３０が置換ガス流入バルブＮを介して接続されたガス配管１において、前記ガス配管１の両端及び前記ベントバルブＶが閉じた状態で、前記置換ガス流入バルブＮを開いて置換ガスの流入を開始し、前記置換ガスにより前記ガス配管１の内部を昇圧し、前記ガス配管１の内部が一定の圧力以上になったら前記ベントバルブＶを開き、前記ガス配管１の内部に存在していた被置換ガスを前記置換ガスとともに前記ベント管２０より放出を開始しつつ前記置換ガスの流入を継続し、前記被置換ガスの濃度が所定以下になったら、前記置換ガスの流入を停止する。【選択図】図１An object of the present invention is to provide a method of replacing gas in a gas pipe, which can perform gas replacement in a short time. According to a gas replacement method in a gas pipe of the present invention, both ends can be opened and closed, a vent pipe is connected via a vent valve, and a replacement gas inflow pipe is connected via a replacement gas inflow valve. In the gas pipe 1 connected to the gas pipe 1 with the both ends of the gas pipe 1 and the vent valve V closed, the replacement gas inflow valve N is opened to start the flow of the replacement gas. The inside of the gas pipe 1 is pressurized, and when the inside of the gas pipe 1 becomes a certain pressure or more, the vent valve V is opened, and the gas to be replaced existing in the gas pipe 1 is removed together with the replacement gas into the vent pipe. The flow of the replacement gas is continued while starting the discharge from 20, and when the concentration of the gas to be replaced becomes lower than a predetermined value, the flow of the replacement gas is stopped. [Selection diagram] Fig. 1

Description

本発明は、ガス配管内のガス置換方法に関する。   The present invention relates to a gas replacement method in a gas pipe.

ボイラへ天然ガス等の燃料ガスを送る配管や、燃料ガスのガスタンク等の容器の点検等を行う際、作業安全性向上のため、燃料ガスの空気への置換操作が実施される。この際、燃料ガスは酸素を含む空気と混合すると引火する可能性があるため、まず、燃料ガスを、不活性ガスで置換し、その後、不活性ガスから空気への置換が実施される。
しかし、不活性ガスにより配管や容器をパージしても燃料ガスが容器から抜けにくく、置換に時間がかかる。燃料ガスの不活性ガスへの置換中は、配管や容器付近で実施される他の作業は、安全性の観点から火気使用禁止や立ち入り禁止等にされるため、置換に時間がかかると作業効率が悪化する。
このため、従来、ガスタンクにおいて、燃料ガスから不活性ガスへの置換を安全且つ短時間に行うため、向きの異なる複数のノズルをタンク上部と下部とに設ける技術が開示されている（例えば特許文献１参照）。 When inspecting piping for sending fuel gas such as natural gas to the boiler, and a container such as a fuel gas gas tank, replacement of the fuel gas with air is performed to improve work safety. At this time, since the fuel gas may ignite when mixed with air containing oxygen, the fuel gas is first replaced with an inert gas, and then the replacement of the inert gas with air is performed.
However, even if the piping or container is purged with an inert gas, the fuel gas is difficult to escape from the container, and replacement takes time. During the replacement of fuel gas with inert gas, other work performed near piping and containers is prohibited from using fire or prohibited from entry from the viewpoint of safety. Gets worse.
For this reason, conventionally, in a gas tank, a technique has been disclosed in which a plurality of nozzles with different orientations are provided in the upper and lower parts of the tank in order to safely and quickly replace the fuel gas with the inert gas (for example, Patent Documents). 1).

特開２００１−３２９９８号公報Japanese Patent Laid-Open No. 2001-32998

しかし、上記従来技術のような、向きの異なる複数のノズルを容器の上部と下部とに設ける技術は、燃料ガスを送るための細長い配管には適用しにくい。   However, the technique of providing a plurality of nozzles with different orientations at the upper and lower parts of the container as in the prior art is difficult to apply to an elongated pipe for sending fuel gas.

本発明は、ガスの置換を短時間に行うことが可能な、ガス配管内のガス置換方法を提供することを目的とする。   An object of this invention is to provide the gas replacement method in gas piping which can perform gas replacement in a short time.

（１）上記課題を解決するために、本発明は以下の方法を提供する。
両端が開閉可能で、ベント管がベントバルブを介して接続され、且つ置換ガス流入管が置換ガス流入バルブを介して接続されたガス配管において、前記ガス配管の両端及び前記ベントバルブが閉じた状態で、前記置換ガス流入バルブを開いて置換ガスの流入を開始し、前記置換ガスにより前記ガス配管の内部を昇圧し、前記ガス配管の内部が一定の圧力以上になったら前記ベントバルブを開き、前記ガス配管の内部に存在していた被置換ガスを前記置換ガスとともに前記ベント管より放出を開始しつつ前記置換ガスの流入を継続し、
前記被置換ガスの濃度が所定以下になったら、前記置換ガスの流入を停止する、ガス配管内のガス置換方法。 (1) In order to solve the above problems, the present invention provides the following method.
Both ends of the gas pipe and the vent valve are closed in a gas pipe in which both ends can be opened and closed, a vent pipe is connected via a vent valve, and a replacement gas inflow pipe is connected via a replacement gas inflow valve Then, the replacement gas inflow valve is opened to start the inflow of the replacement gas, the pressure inside the gas pipe is increased by the replacement gas, and the vent valve is opened when the inside of the gas pipe becomes a certain pressure or more, The inflow of the replacement gas is continued while starting to be released from the vent pipe together with the replacement gas, which was present inside the gas pipe,
A gas replacement method in a gas pipe, which stops the inflow of the replacement gas when the concentration of the replacement gas becomes a predetermined value or less.

前記置換ガスの比重は、前記被置換ガスよりも小さくてもよい。   The replacement gas may have a specific gravity smaller than that of the replacement gas.

前記置換ガスの比重が、前記被置換ガスよりも大きくてもよい、   The specific gravity of the replacement gas may be larger than the gas to be replaced.

前記被置換ガスが燃焼ガスで、前記置換ガスが不活性ガスであってもよい。   The replacement gas may be a combustion gas, and the replacement gas may be an inert gas.

前記被置換ガスが天然ガスで、前記置換ガスが窒素ガスであってもよい。   The replacement gas may be natural gas and the replacement gas may be nitrogen gas.

互いに接続された前記ガス配管を複数備え、複数の前記ガス配管における、前記被置換ガスが流入する上流側に配置されたガス配管から、順にガス置換を行ってもよい。   A plurality of the gas pipes connected to each other may be provided, and the gas replacement may be sequentially performed from the gas pipes arranged on the upstream side into which the gas to be replaced flows in the plurality of gas pipes.

本発明によれば、ガスの置換を短時間に行うことが可能な、ガス配管内のガス置換方法を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the gas replacement method in gas piping which can perform gas replacement in a short time can be provided.

（ａ）及び（ｂ）は、第１実施形態における、ガス配管１内の被置換ガスを置換ガスに置換するガス置換方法を説明する図であり、置換ガスが被置換ガスより軽い場合を示す。(A) And (b) is a figure explaining the gas replacement method which replaces the substituted gas in the gas piping 1 in 1st Embodiment by substitution gas, and shows the case where substitution gas is lighter than substitution gas. . （ａ）及び（ｂ）は、第１実施形態における、ガス配管１内の被置換ガスを置換ガスに置換するガス置換方法を説明する図であり、置換ガスが被置換ガスより重い場合を示す。(A) And (b) is a figure explaining the gas replacement method which replaces the to-be-replaced gas in the gas piping 1 in 1st Embodiment by replacement gas, and shows the case where replacement gas is heavier than to-be-replaced gas. . 第１実施形態のガス配管１の置換ガスへのガス置換方法を示すフローチャートである。It is a flowchart which shows the gas replacement method to the replacement gas of the gas piping 1 of 1st Embodiment. 比較形態におけるガス置換方法を説明する図である。It is a figure explaining the gas replacement method in a comparison form. 第２実施形態のガス置換方法が実施される、ボイラ燃焼設備におけるガス配管を示す図である。It is a figure which shows the gas piping in a boiler combustion installation with which the gas replacement method of 2nd Embodiment is implemented. 燃料ガス供給部から供給される高圧の被置換ガスが流れる高圧ガス配管のガス置換時の状態を示した図である。It is the figure which showed the state at the time of gas replacement of the high pressure gas piping through which the high pressure to-be-replaced gas supplied from a fuel gas supply part flows. 高圧の被置換ガスを減圧する減圧部を含む減圧ガス配管のガス置換時の状態を示した図である。It is the figure which showed the state at the time of gas replacement of the decompression gas piping containing the decompression part which decompresses high pressure to-be-substituted gas. 減圧された後の被置換ガスを、点火用のガスと燃焼用のガスとに分離して、ボイラに供給するボイラ側ガス配管のガス置換時の状態を示した図である。It is the figure which showed the state at the time of the gas replacement of the boiler side gas piping which isolate | separates the to-be-replaced gas after pressure-reducing into the gas for ignition and the gas for combustion, and supplies to a boiler.

（第１実施形態）
以下、本発明の第１実施形態のガス配管１のガス置換方法について説明する。
図１（ａ）及び（ｂ）は、ガス配管１内の被置換ガスを置換ガスに置換するガス置換方法を説明する図であり、置換ガスが被置換ガスより軽い場合を示す。
図２（ａ）及び（ｂ）は、ガス配管１内の被置換ガスを置換ガスに置換するガス置換方法を説明する図であり、置換ガスが被置換ガスより重い場合を示す。 (First embodiment)
Hereinafter, the gas replacement method of the gas piping 1 of 1st Embodiment of this invention is demonstrated.
FIGS. 1A and 1B are diagrams for explaining a gas replacement method for replacing a replacement gas in the gas pipe 1 with a replacement gas, and shows a case where the replacement gas is lighter than the replacement gas.
FIGS. 2A and 2B are views for explaining a gas replacement method for replacing the replacement gas in the gas pipe 1 with the replacement gas, and shows a case where the replacement gas is heavier than the replacement gas.

図１及び図２のいずれの場合も、ガス配管１は、両端にガス配管開閉バルブＴが設けられている。
ガス配管１の一端側には、ガス配管１内のガスを排気するベント管２０がベントバルブＶを介して接続されている。
さらに、ガス配管１の他端側には、置換ガスを流し込む置換ガス流入管３０が置換ガス流入バルブＮを介して接続されている。また、ガス配管１には、圧力計Ｐ及びガス検知器Ｇも取り付けられている。 1 and 2, the gas pipe 1 is provided with gas pipe opening / closing valves T at both ends.
A vent pipe 20 for exhausting the gas in the gas pipe 1 is connected to one end side of the gas pipe 1 via a vent valve V.
Further, a replacement gas inflow pipe 30 for supplying replacement gas is connected to the other end of the gas pipe 1 through a replacement gas inflow valve N. A pressure gauge P and a gas detector G are also attached to the gas pipe 1.

（ガス置換方法）
図３は、第１実施形態のガス配管１の置換ガスへのガス置換方法を示すフローチャートである。
まず、ガス配管１内に被置換ガスが存在している状態で、ガス配管１の両端のガス配管開閉バルブＴを閉じる（ステップＳ１）。 (Gas replacement method)
FIG. 3 is a flowchart showing a gas replacement method for the replacement gas in the gas pipe 1 of the first embodiment.
First, the gas pipe opening / closing valve T at both ends of the gas pipe 1 is closed in a state where the gas to be replaced is present in the gas pipe 1 (step S1).

ベントバルブＶが閉じた状態で置換ガス流入バルブＮを開いて置換ガスの流入を開始する（ステップＳ２）。そうすると、置換ガスの流入によりガス配管１内が昇圧される。
このとき、置換ガスが被置換ガスより軽い場合、図１（ａ）に示すように、置換ガスは置換ガス流入管３０から上方に流れ込む。置換ガスより重い被置換ガスは、ガス配管１の両端の下方に追いやられる。
また、置換ガスが被置換ガスより重い場合、図２（ａ）に示すように、置換ガスは置換ガス流入管３０からガス配管１内に流入された後、置換ガスよりも下方へと流れる。置換ガスより軽い被置換ガスは、ガス配管１の両端の上方に追いやられる。 With the vent valve V closed, the replacement gas inflow valve N is opened to start the replacement gas inflow (step S2). Then, the pressure in the gas pipe 1 is increased by the inflow of the replacement gas.
At this time, when the replacement gas is lighter than the replacement gas, the replacement gas flows upward from the replacement gas inflow pipe 30 as shown in FIG. The gas to be replaced that is heavier than the replacement gas is driven down below both ends of the gas pipe 1.
When the replacement gas is heavier than the replacement gas, as shown in FIG. 2A, the replacement gas flows into the gas pipe 1 from the replacement gas inflow pipe 30 and then flows downward from the replacement gas. The gas to be replaced, which is lighter than the replacement gas, is expelled above both ends of the gas pipe 1.

圧力計Ｐによりガス配管１内の圧力を監視し、ガス配管１内の圧力が所定圧力、例えば０．４ＭＰａ以上になったら（ステップＳ３，ＹＥＳ）、ベントバルブＶを開く（図１（ｂ），図２（ｂ），ステップＳ４）。そうすると、ガス配管１内の被置換ガスは、置換ガスによって押圧されて、置換ガスとともに一気にベント管２０より放出される。
この際、ガス配管１内のガスが一気に解放されることにより、乱流が発生して、被置換ガスが置換ガスと混合されて流出されるため、被置換ガスの流出がより促進される。 The pressure in the gas pipe 1 is monitored by the pressure gauge P, and when the pressure in the gas pipe 1 becomes a predetermined pressure, for example, 0.4 MPa or more (step S3, YES), the vent valve V is opened (FIG. 1 (b)). FIG. 2 (b), step S4). If it does so, the to-be-replaced gas in the gas piping 1 will be pressed by replacement gas, and will be discharge | released from the vent pipe 20 at a stretch with replacement gas.
At this time, the gas in the gas pipe 1 is released all at once, so that a turbulent flow is generated and the replacement gas is mixed with the replacement gas and flows out, so that the outflow of the replacement gas is further promoted.

その後も、置換ガスの流入を継続しつつ、ガス検知器Ｇによって被置換ガスの濃度を監視する。このように、ベントバルブＶを開けた後も、置換ガスの流入を継続することにより、被置換ガスと置換ガスとの混合が、さらに促進され、被置換ガスの除去をより完全に行うことができる。
そして、内部の被置換ガス濃度が所定量以下になったら（ステップＳ５，ＹＥＳ），置換ガス流入バルブＮを閉じて置換ガスの流入を停止する（ステップＳ６）。これにより、置換ガス置換工程を終了する。
なお、その後、ベント管２０を開いたままにする。そうすると、ガス配管１内は空気に置換されていく。 Thereafter, the gas detector G monitors the concentration of the replacement gas while continuing the replacement gas flow. Thus, by continuing the inflow of the replacement gas even after the vent valve V is opened, the mixing of the replacement gas and the replacement gas is further promoted, and the replacement gas can be removed more completely. it can.
Then, when the concentration of the gas to be replaced becomes equal to or less than the predetermined amount (step S5, YES), the replacement gas inflow valve N is closed to stop the inflow of the replacement gas (step S6). Thereby, the replacement gas replacement step is completed.
After that, the vent pipe 20 is kept open. Then, the gas pipe 1 is replaced with air.

（比較形態）
図４は比較形態におけるガス配管１の置換ガスへのガス置換方法を説明する図であり、図４（ａ）は置換ガスが被置換ガスより軽い場合、図５（ｂ）は置換ガスが被置換ガスより重い場合である。
比較形態も、まず、ガス配管１内に、被置換ガスが存在している状態で、ガス配管１の両端のガス配管開閉バルブＴを閉じる。しかし、比較形態では、ベントバルブＶが開いている状態で置換ガス流入バルブＮを開いて置換ガスの流入を開始する。 (Comparison form)
FIG. 4 is a view for explaining a gas replacement method for the replacement gas in the gas pipe 1 in the comparative embodiment. FIG. 4 (a) shows a case where the replacement gas is lighter than the replacement gas, and FIG. The case is heavier than the replacement gas.
In the comparison mode, first, the gas pipe opening / closing valves T at both ends of the gas pipe 1 are closed in a state where the gas to be replaced is present in the gas pipe 1. However, in the comparative embodiment, the replacement gas inflow valve N is opened while the vent valve V is open, and the inflow of replacement gas is started.

比較形態ではガス配管１内の圧力は一定であり、ガス配管１内には一定のガスの流れが生じている。
図４（ａ）の場合、置換ガスは被置換ガスよりも比重が軽いので、置換ガスはガス配管１内において上方を流れ、ベントバルブＶから流出する。このとき、ガス配管１の両端の下方に存在する被置換ガスは、ベントバルブＶから流出しくい。したがって被置換ガスの置換ガスによる置換が進行しにくい。
図４（ｂ）の場合、置換ガスは被置換ガスよりも比重が重いので、置換ガスはガス配管１内において下方を流れ、ベントバルブＶから流出する。このとき、ガス配管１の両端の上方に存在する被置換ガスは、ベントバルブＶから流出しくい。したがって被置換ガスの置換ガスによる置換が進行しにくい。 In the comparative form, the pressure in the gas pipe 1 is constant, and a constant gas flow is generated in the gas pipe 1.
In the case of FIG. 4A, the replacement gas has a lower specific gravity than the replacement gas, so the replacement gas flows upward in the gas pipe 1 and flows out from the vent valve V. At this time, the replacement gas existing below both ends of the gas pipe 1 does not flow out of the vent valve V. Therefore, the replacement of the replacement gas with the replacement gas is difficult to proceed.
In the case of FIG. 4B, the replacement gas has a higher specific gravity than the replacement gas, so that the replacement gas flows downward in the gas pipe 1 and flows out from the vent valve V. At this time, the replacement gas existing above both ends of the gas pipe 1 does not flow out of the vent valve V. Therefore, the replacement of the replacement gas with the replacement gas is difficult to proceed.

一方、本実施形態によると、上述したように、置換ガスの流入時にベント管２０が閉じているのでガス配管１が昇圧される。この昇圧状態でベントバルブＶを開くと、被置換ガスが、置換ガスによって押圧されて、置換ガスとともに一気にベント管２０より放出される。この際、ガス配管１内のベントバルブＶ付近では、一気に解放されることにより、乱流が発生して、被置換ガスが置換ガスと混合されてベント管２０へ流出されるため、被置換ガスの流出がより促進される。ゆえに、被置換ガスの置換ガスへの置換時間が比較形態と比べて短時間ですみ、作業効率が向上する。   On the other hand, according to the present embodiment, as described above, the gas pipe 1 is pressurized because the vent pipe 20 is closed when the replacement gas flows in. When the vent valve V is opened in this pressure-increasing state, the replacement gas is pressed by the replacement gas and discharged from the vent pipe 20 together with the replacement gas. At this time, in the vicinity of the vent valve V in the gas pipe 1, turbulent flow is generated by being released all at once, so that the gas to be replaced is mixed with the replacement gas and flows out to the vent pipe 20. Spillage is further promoted. Therefore, the replacement time of the gas to be replaced with the replacement gas is shorter than that of the comparative embodiment, and the working efficiency is improved.

（第２実施形態）
図５は、第２実施形態のガス置換方法が実施される、ボイラ燃焼設備１００におけるガス配管１（１Ａ，１Ｂ，１Ｃ）を示す図であり、ボイラ燃焼設備１００の通常の燃焼時の状態を示す。第２実施形態では、被置換ガスとして天然ガス、置換ガスとして窒素ガスを用いる。
ボイラ燃焼設備１００は、燃料ガス供給部１０１から供給された高圧の天然ガスを、減圧部１０４で減圧し、さらに点火用ガスと燃焼用ガスとに分離して、ボイラ１０３のバーナ点火用バーナ１０３ａと燃焼用バーナ１０３ｂとに供給する設備である。 (Second Embodiment)
FIG. 5 is a diagram showing the gas pipes 1 (1A, 1B, 1C) in the boiler combustion facility 100 in which the gas replacement method of the second embodiment is implemented, and shows the state of the boiler combustion facility 100 during normal combustion. Show. In the second embodiment, natural gas is used as the replacement gas, and nitrogen gas is used as the replacement gas.
In the boiler combustion facility 100, the high-pressure natural gas supplied from the fuel gas supply unit 101 is decompressed by the decompression unit 104 and further separated into an ignition gas and a combustion gas, and the burner ignition burner 103a of the boiler 103 is obtained. And the combustion burner 103b.

ボイラ燃焼設備１００のガス配管１は、例えば５００ｍと長いため、ガス配管１全体に対して一気に窒素ガスへの置換作業を行うと、窒素ガスが全体に行きわたりにくい。したがって、ガス配管１を３つの部分に分けて、それぞれにおいてガス置換を行う。   Since the gas pipe 1 of the boiler combustion facility 100 is as long as, for example, 500 m, the nitrogen gas is difficult to reach the entire gas pipe 1 by performing a replacement operation with the nitrogen gas all at once. Therefore, the gas pipe 1 is divided into three parts, and gas replacement is performed in each of them.

３つの部分は、燃料ガスの上流側から、燃料ガス供給部１０１から供給される高圧の天然ガスが流れる高圧ガス配管１Ａと、高圧の天然ガスを減圧する減圧部１０４を含む減圧ガス配管１Ｂと、減圧された後の天然ガスを、点火用のガスと燃焼用のガスとに分離して、ボイラ１０３内に供給するボイラ側ガス配管１Ｃとである。   The three parts are a high-pressure gas pipe 1A through which the high-pressure natural gas supplied from the fuel gas supply unit 101 flows from the upstream side of the fuel gas, and a decompression gas pipe 1B including a decompression unit 104 that decompresses the high-pressure natural gas. The boiler-side gas pipe 1 </ b> C separates the natural gas after being decompressed into an ignition gas and a combustion gas and supplies the gas into the boiler 103.

高圧ガス配管１Ａの上流側にはガス配管開閉バルブＴ１、下流側にはガス配管開閉バルブＴ２が設けられている。減圧ガス配管１Ｂの上流側にはガス配管開閉バルブＴ２、下流側にはガス配管開閉バルブＴ３が設けられている。ボイラ側ガス配管１Ｃの上流側にはガス配管開閉バルブＴ３、下流側にはガス配管開閉バルブＴ４が設けられている。   A gas pipe opening / closing valve T1 is provided upstream of the high-pressure gas pipe 1A, and a gas pipe opening / closing valve T2 is provided downstream. A gas pipe open / close valve T2 is provided upstream of the decompression gas pipe 1B, and a gas pipe open / close valve T3 is provided downstream. A gas pipe opening / closing valve T3 is provided on the upstream side of the boiler-side gas pipe 1C, and a gas pipe opening / closing valve T4 is provided on the downstream side.

ガス配管１Ａ，１Ｂ，１Ｃには、窒素ガス供給部１０２より、それぞれ窒素ガス流入管３０Ａ，３０Ｂ，３０Ｃが接続されている。窒素ガス流入管３０Ａ，３０Ｂ，３０Ｃにおける、それぞれのガス配管１Ａ，１Ｂ，１Ｃへの連結部近傍には、それぞれ窒素ガス流入バルブＮＡ，ＮＢ，ＮＣが設けられている。
また、窒素ガス流入管３０Ａ，３０Ｂ，３０Ｃにおける窒素ガス供給部１０２への連結部近傍には、それぞれ窒素ガス開閉バルブＭＡ，ＭＢ，ＭＣが設けられている。 Nitrogen gas inflow pipes 30A, 30B, and 30C are connected to the gas pipes 1A, 1B, and 1C from the nitrogen gas supply unit 102, respectively. Nitrogen gas inflow valves NA, NB, and NC are provided in the vicinity of the connecting portions of the nitrogen gas inflow pipes 30A, 30B, and 30C to the gas pipes 1A, 1B, and 1C, respectively.
Further, nitrogen gas on-off valves MA, MB, and MC are provided in the vicinity of the connecting portion to the nitrogen gas supply unit 102 in the nitrogen gas inflow pipes 30A, 30B, and 30C, respectively.

ガス配管１Ａ，１Ｂ，１Ｃには、それぞれベント管２０Ａ，２０Ｂ，２０Ｃが連結されている。ベント管２０Ａ，２０Ｂ，２０Ｃの、それぞれのガス配管１Ａ，１Ｂ，１Ｃへの連結部近傍には、それぞれベントバルブＶＡ，ＶＢ，ＶＣが設けられている。   Vent pipes 20A, 20B, and 20C are connected to the gas pipes 1A, 1B, and 1C, respectively. Vent valves VA, VB, and VC are provided in the vicinity of the connecting portions of the vent pipes 20A, 20B, and 20C to the gas pipes 1A, 1B, and 1C, respectively.

図５に示す、通常の燃焼時の状態を示す状態では、ガス配管開閉バルブＴ１，Ｔ２、Ｔ３は開いている。窒素ガス流入バルブＮＡ，ＮＢ，ＮＣと、窒素ガス開閉バルブＭＡ，Ｍｂ，ＭＣと、ベントバルブＶＡ，ＶＢ，ＶＣとは閉じている。
したがって、燃料ガス供給部１０１から供給された高圧の天然ガスは、ガス配管１内を通過し、減圧部１０４で減圧され、ボイラ１０３のバーナ点火用バーナ１０３ａと燃焼用バーナ１０３ｂへと送られる。 In the state shown in FIG. 5 showing the state during normal combustion, the gas pipe opening / closing valves T1, T2, and T3 are open. Nitrogen gas inflow valves NA, NB, NC, nitrogen gas on / off valves MA, Mb, MC, and vent valves VA, VB, VC are closed.
Therefore, the high-pressure natural gas supplied from the fuel gas supply unit 101 passes through the gas pipe 1, is decompressed by the decompression unit 104, and is sent to the burner ignition burner 103a and the combustion burner 103b of the boiler 103.

（高圧ガス配管１Ａのガス置換）
図６は、燃料ガス供給部１０１から供給される高圧の天然ガスが流れる高圧ガス配管１Ａのガス置換時の状態を示した図である。
図示するように、高圧ガス配管１Ａの上流側に設けられたガス配管開閉バルブＴ１と、下流側に設けられたガス配管開閉バルブＴ２とを閉じる。
そして、ベントバルブＶＡが閉じた状態で窒素ガス開閉バルブＭＡ及び窒素ガス流入バルブＮＡを開いて高圧ガス配管１Ａへの窒素ガスの流入を開始する。そうすると、窒素ガスの流入により高圧ガス配管１Ａ内が昇圧される。
圧力計Ｐにより高圧ガス配管１Ａ内の圧力を監視し、高圧ガス配管１Ａ内の圧力が一定の圧力以上になったら、ベントバルブＶＡを開く。
そうすると、高圧ガス配管１Ａ内の天然ガスは、窒素ガスによって押圧されて、窒素ガスとともに一気にベント管２０Ａより放出される。
その後も窒素ガスの流入を継続しつつ、ガス検知器Ｇによって天然ガスの濃度を監視し、内部の天然ガス濃度が規定量以下になったら窒素ガス開閉バルブＭＡ及び窒素ガス流入バルブＮＡを閉じて窒素ガスの流入を停止する。
その後、ベントバルブＶＡを開いたままにしておくと、高圧ガス配管１Ａ内の窒素ガスは空気よりも軽いため、高圧ガス配管１Ａ内の窒素ガスは徐々に空気に置換されていく。この状態で次の減圧ガス配管１Ｂのガス置換に移る。 (Gas replacement of high-pressure gas pipe 1A)
FIG. 6 is a diagram illustrating a state during gas replacement of the high-pressure gas pipe 1A through which the high-pressure natural gas supplied from the fuel gas supply unit 101 flows.
As shown in the drawing, the gas pipe opening / closing valve T1 provided on the upstream side of the high-pressure gas pipe 1A and the gas pipe opening / closing valve T2 provided on the downstream side are closed.
Then, with the vent valve VA closed, the nitrogen gas on-off valve MA and the nitrogen gas inflow valve NA are opened to start the inflow of nitrogen gas into the high pressure gas pipe 1A. Then, the pressure in the high-pressure gas pipe 1A is increased by the inflow of nitrogen gas.
The pressure in the high-pressure gas pipe 1A is monitored by the pressure gauge P, and when the pressure in the high-pressure gas pipe 1A becomes equal to or higher than a certain pressure, the vent valve VA is opened.
Then, the natural gas in the high-pressure gas pipe 1 </ b> A is pressed by the nitrogen gas and is released from the vent pipe 20 </ b> A at a stretch together with the nitrogen gas.
After that, while the inflow of nitrogen gas is continued, the concentration of natural gas is monitored by the gas detector G, and when the internal natural gas concentration falls below the specified amount, the nitrogen gas on-off valve MA and the nitrogen gas inflow valve NA are closed. Stop the inflow of nitrogen gas.
Thereafter, if the vent valve VA is left open, the nitrogen gas in the high-pressure gas pipe 1A is lighter than air, so that the nitrogen gas in the high-pressure gas pipe 1A is gradually replaced with air. In this state, the process proceeds to gas replacement of the next decompression gas pipe 1B.

（減圧ガス配管１Ｂのガス置換）
図７は、高圧の天然ガスを減圧する減圧部１０４を含む減圧ガス配管１Ｂのガス置換時の状態を示した図である。
図示するように、減圧ガス配管１Ｂの上流側に設けられたガス配管開閉バルブＴ２と、下流側に設けられたガス配管開閉バルブＴ３とを閉じる。
そして、ベントバルブＶＢが閉じた状態で窒素ガス開閉バルブＭＢ及び窒素ガス流入バルブＮＢを開いて減圧ガス配管１Ｂへの窒素ガスの流入を開始する。そうすると、窒素ガスの流入により減圧ガス配管１Ｂ内が昇圧される。
圧力計Ｐにより減圧ガス配管１Ｂ内の圧力を監視し、減圧ガス配管１Ｂ内の圧力が一定の圧力以上になったら、ベントバルブＶＢを開く。
そうすると、減圧ガス配管１Ｂ内の天然ガスは、窒素ガスによって押圧されて、窒素ガスとともに一気にベント管２０Ｂより放出される。
その後も窒素ガスの流入を継続しつつ、ガス検知器Ｇによって天然ガスの濃度を監視し、内部の天然ガス濃度が規定量以下になったら窒素ガス開閉バルブＭＢ及び窒素ガス流入バルブＮＢを閉じて窒素ガスの流入を停止する。
その後、ベントバルブＶＢを開いたままにしておくと、減圧ガス配管１Ｂ内の内部の窒素ガスは空気よりも軽いため、減圧ガス配管１Ｂ内の窒素ガスは徐々に空気に置換されていく。この状態で次のボイラ側ガス配管１Ｃのガス置換に移る。 (Gas replacement of decompression gas pipe 1B)
FIG. 7 is a diagram showing a state of the decompression gas pipe 1B including the decompression unit 104 that decompresses the high-pressure natural gas during gas replacement.
As shown in the drawing, the gas pipe opening / closing valve T2 provided on the upstream side of the decompression gas pipe 1B and the gas pipe opening / closing valve T3 provided on the downstream side are closed.
Then, with the vent valve VB closed, the nitrogen gas on-off valve MB and the nitrogen gas inflow valve NB are opened to start the inflow of nitrogen gas into the decompression gas pipe 1B. Then, the pressure in the decompression gas pipe 1B is increased by the inflow of nitrogen gas.
The pressure in the decompression gas pipe 1B is monitored by the pressure gauge P, and when the pressure in the decompression gas pipe 1B exceeds a certain pressure, the vent valve VB is opened.
If it does so, the natural gas in the decompression gas piping 1B will be pressed by nitrogen gas, and will be discharge | released from the vent pipe 20B at a stretch with nitrogen gas.
After that, while the inflow of nitrogen gas is continued, the concentration of natural gas is monitored by the gas detector G, and when the internal natural gas concentration falls below the specified amount, the nitrogen gas on-off valve MB and the nitrogen gas inflow valve NB are closed. Stop the inflow of nitrogen gas.
Thereafter, if the vent valve VB is kept open, the nitrogen gas inside the decompression gas pipe 1B is lighter than air, so the nitrogen gas inside the decompression gas pipe 1B is gradually replaced with air. In this state, the process proceeds to gas replacement of the next boiler side gas pipe 1C.

（減圧ガス配管１Ｂのガス置換）
図７は、減圧された後の天然ガスを、点火用のガスと燃焼用のガスとに分離して、ボイラ１０３に供給するボイラ側ガス配管１Ｃのガス置換時の状態を示した図である。
図示するように、ボイラ側ガス配管１Ｃの上流側に設けられたガス配管開閉バルブＴ３と、下流側に設けられたガス配管開閉バルブＴ４とを閉じる。なお、この場合、ガス配管開閉バルブＴ４とベントバルブＶＣとは共通である。
そして、ベントバルブＶＣが閉じた状態で窒素ガス開閉バルブＭＣ及び窒素ガス流入バルブＮＣを開いてボイラ側ガス配管１Ｃへの窒素ガスの流入を開始する。そうすると、窒素ガスの流入によりボイラ側ガス配管１Ｃ内が昇圧される。
圧力計Ｐによりボイラ側ガス配管１Ｃ内の圧力を監視し、ボイラ側ガス配管１Ｃ内の圧力が一定の圧力以上になったら、ベントバルブＶＣを開く。
そうすると、ボイラ側ガス配管１Ｃ内の天然ガスは、窒素ガスによって押圧されて、窒素ガスとともに一気にベント管２０Ｃより放出される。
その後も窒素ガスの流入を継続しつつ、ガス検知器Ｇによって天然ガスの濃度を監視し、内部の天然ガス濃度が規定量以下になったら窒素ガス開閉バルブＭＣ及び窒素ガス流入バルブＮＣを閉じて窒素ガスの流入を停止する。
その後、ベントバルブＶＣを開いたままにしておくと、ボイラ側ガス配管１Ｃ内の窒素ガスは空気よりも軽いため、ボイラ側ガス配管１Ｃ内は空気に置換されていく。 (Gas replacement of decompression gas pipe 1B)
FIG. 7 is a diagram showing a state of gas replacement in the boiler-side gas pipe 1 </ b> C that separates the natural gas after decompression into an ignition gas and a combustion gas and supplies the gas to the boiler 103. .
As shown in the drawing, the gas pipe opening / closing valve T3 provided on the upstream side of the boiler-side gas pipe 1C and the gas pipe opening / closing valve T4 provided on the downstream side are closed. In this case, the gas pipe opening / closing valve T4 and the vent valve VC are common.
Then, with the vent valve VC closed, the nitrogen gas on-off valve MC and the nitrogen gas inflow valve NC are opened to start the inflow of nitrogen gas into the boiler side gas piping 1C. Then, the pressure in the boiler-side gas pipe 1C is increased by the inflow of nitrogen gas.
The pressure in the boiler side gas pipe 1C is monitored by the pressure gauge P, and when the pressure in the boiler side gas pipe 1C becomes equal to or higher than a certain pressure, the vent valve VC is opened.
If it does so, the natural gas in boiler side gas piping 1C will be pressed by nitrogen gas, and will be discharged from vent pipe 20C at a stretch with nitrogen gas.
After that, while the inflow of nitrogen gas continues, the gas detector G monitors the natural gas concentration, and when the internal natural gas concentration falls below the specified amount, close the nitrogen gas on-off valve MC and the nitrogen gas inflow valve NC. Stop the inflow of nitrogen gas.
Thereafter, if the vent valve VC is kept open, the nitrogen gas in the boiler side gas pipe 1C is lighter than air, so that the boiler side gas pipe 1C is replaced with air.

以上、第２実施形態においても、分割されたそれぞれの配管における置換ガスとしての窒素ガスの流入時にベントバルブＶが閉じているのでガス配管１が昇圧される。この、昇圧状態でベントバルブＶを開くと、被置換ガスとしての天然ガスが、窒素ガスによって押圧されて、窒素ガスとともに一気にベント管２０より放出される。
この際、ガス配管１内のベントバルブＶ付近では、一気に解放されることにより、乱流が発生して、天然ガスが窒素ガスと混合されて流出されるため、天然ガスの流出がより促進される。
ゆえに、天然ガスの不活性ガスへの置換時間が比較形態と比べて短時間ですみ、作業効率が向上する。
また、長いガス配管１を分割して置換していくので、全体を一気に窒素ガスで置換する場合と比べて、ガス配管１内において置換ガスが到達しにくい領域が減少され、隅々まで置換することができる。
さらに、分割されたガス配管１Ａ、１Ｂ、１Ｃを上流の高圧側から置換していく、被置換ガスである天然ガスの逆流が少ない。 As mentioned above, also in 2nd Embodiment, since the vent valve V is closed at the time of inflow of nitrogen gas as replacement gas in each divided | segmented piping, the gas piping 1 is pressure | voltage-rised. When the vent valve V is opened in this boosted state, the natural gas as the gas to be replaced is pressed by the nitrogen gas and discharged from the vent pipe 20 together with the nitrogen gas.
At this time, in the vicinity of the vent valve V in the gas pipe 1, turbulent flow is generated by being released all at once, and natural gas is mixed with nitrogen gas and flows out, so that the outflow of natural gas is further promoted. The
Therefore, the replacement time of the natural gas with the inert gas is shorter than that of the comparative form, and the working efficiency is improved.
In addition, since the long gas pipe 1 is divided and replaced, the area where the replacement gas is difficult to reach in the gas pipe 1 is reduced compared to the case where the entire gas pipe 1 is replaced with nitrogen gas all at once. be able to.
Furthermore, there is little backflow of the natural gas that is the gas to be replaced, which replaces the divided gas pipes 1A, 1B, and 1C from the upstream high pressure side.

Ｎ 置換ガス流入バルブ
ＮＡ，ＮＢ，ＮＣ 窒素ガス流入バルブ
Ｐ 圧力計
Ｔ，Ｔ１，Ｔ２，Ｔ３，Ｔ４ ガス配管開閉バルブ
Ｖ ベントバルブ
ＶＡ，ＶＢ，ＶＣ ベントバルブ
１ ガス配管
１Ａ 高圧ガス配管
１Ｂ 減圧ガス配管
１Ｃ ボイラ側配管
２０，２０Ａ，２０Ｂ，２０Ｃ ベント管
３０ 置換ガス流入管
３０Ａ，３０Ｂ，３０Ｃ 窒素ガス流入管
１００ ボイラ燃焼設備
１０１ 燃料ガス供給部
１０２ 窒素ガス供給部 N Replacement gas inlet valve NA, NB, NC Nitrogen gas inlet valve P Pressure gauge T, T1, T2, T3, T4 Gas piping open / close valve V Vent valve VA, VB, VC Vent valve 1 Gas piping 1A High pressure gas piping 1B Pressure reducing gas Piping 1C Boiler side piping 20, 20A, 20B, 20C Vent pipe 30 Replacement gas inflow pipe 30A, 30B, 30C Nitrogen gas inflow pipe 100 Boiler combustion equipment 101 Fuel gas supply section 102 Nitrogen gas supply section

Claims (6)

両端が開閉可能で、ベント管がベントバルブを介して接続され、且つ置換ガス流入管が置換ガス流入バルブを介して接続されたガス配管において、
前記ガス配管の両端及び前記ベントバルブが閉じた状態で、前記置換ガス流入バルブを開いて置換ガスの流入を開始し、
前記置換ガスにより前記ガス配管の内部を昇圧し、
前記ガス配管の内部が一定の圧力以上になったら前記ベントバルブを開き、前記ガス配管の内部に存在していた被置換ガスを前記置換ガスとともに前記ベント管より放出を開始しつつ前記置換ガスの流入を継続し、
前記被置換ガスの濃度が所定以下になったら、前記置換ガスの流入を停止する、
ガス配管内のガス置換方法。 In a gas pipe that can be opened and closed at both ends, a vent pipe is connected via a vent valve, and a replacement gas inflow pipe is connected via a replacement gas inflow valve,
With both ends of the gas pipe and the vent valve closed, the replacement gas inflow valve is opened to start the inflow of replacement gas,
Pressurizing the inside of the gas pipe with the replacement gas,
When the inside of the gas pipe reaches a certain pressure or higher, the vent valve is opened, and the replacement gas existing inside the gas pipe is released together with the replacement gas from the vent pipe while starting to release the replacement gas. Continue the inflow,
When the concentration of the replacement gas becomes a predetermined value or less, the inflow of the replacement gas is stopped.
Gas replacement method in gas piping. 前記置換ガスの比重が、前記被置換ガスよりも小さい、
請求項１に記載のガス配管内のガス置換方法。 The specific gravity of the replacement gas is smaller than the gas to be replaced,
The gas replacement method in the gas piping according to claim 1. 前記置換ガスの比重が、前記被置換ガスよりも大きい、
請求項１に記載のガス配管内のガス置換方法。 The specific gravity of the replacement gas is greater than that of the gas to be replaced.
The gas replacement method in the gas piping according to claim 1. 前記被置換ガスが燃焼ガスで、
前記置換ガスが不活性ガスである、
請求項３に記載のガス配管内のガス置換方法。 The replacement gas is a combustion gas,
The replacement gas is an inert gas;
A gas replacement method in a gas pipe according to claim 3. 前記被置換ガスが天然ガスで、
前記置換ガスが窒素ガスである、
請求項４に記載のガス配管内のガス置換方法。 The replacement gas is natural gas,
The replacement gas is nitrogen gas;
The gas replacement method in the gas piping according to claim 4. 互いに接続された前記ガス配管を複数備え、
複数の前記ガス配管における、前記被置換ガスが流入する上流側に配置されたガス配管から、順にガス置換を行う、
請求項１から５のいずれか１項に記載のガス配管内のガス置換方法。 A plurality of the gas pipes connected to each other;
In the plurality of gas pipes, gas replacement is performed in order from the gas pipes arranged on the upstream side into which the gas to be replaced flows.
The gas replacement method in the gas piping according to any one of claims 1 to 5.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220086063A (en) * 2020-12-16 2022-06-23 주식회사 포스코 Gas purge system
WO2024190017A1 (en) * 2023-03-13 2024-09-19 三菱造船株式会社 Method for inspecting tank facility

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115405800A (en) * 2022-09-16 2022-11-29 中国海洋石油集团有限公司 Method for eliminating blockage of natural gas hydrate for gas transmission pipeline

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0534399U (en) * 1991-10-14 1993-05-07 石川島播磨重工業株式会社 Inert gas replacement device in loading arm for receiving liquefied gas
JPH11300190A (en) * 1998-04-27 1999-11-02 Sony Corp Chemical manufacturing equipment for semiconductor manufacturing
JP2001027400A (en) * 1999-07-13 2001-01-30 Nippon Sanso Corp Gas supply device and gas replacement method
JP2001032998A (en) * 1999-07-23 2001-02-06 Ishikawajima Harima Heavy Ind Co Ltd Gas replacement method for large tank and tank structure using the same
JP2001324093A (en) * 2000-05-18 2001-11-22 Nihonkai Lng Co Ltd LNG lorry shipping method
JP2001355800A (en) * 2000-06-14 2001-12-26 Nippon Applied Flow Kk Gas supply device
US20020152797A1 (en) * 2001-01-09 2002-10-24 Mcandrew James J.F. Gas delivery apparatus and method for monitoring a gas phase species therein
JP2006307936A (en) * 2005-04-27 2006-11-09 Kita Kyushu Lng Kk Lng shipping method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2749924B1 (en) * 1996-06-18 1998-08-21 Air Liquide DEVICE FOR PROVIDING AN APPARATUS WITH ANY MULTIPLE GASES

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0534399U (en) * 1991-10-14 1993-05-07 石川島播磨重工業株式会社 Inert gas replacement device in loading arm for receiving liquefied gas
JPH11300190A (en) * 1998-04-27 1999-11-02 Sony Corp Chemical manufacturing equipment for semiconductor manufacturing
JP2001027400A (en) * 1999-07-13 2001-01-30 Nippon Sanso Corp Gas supply device and gas replacement method
JP2001032998A (en) * 1999-07-23 2001-02-06 Ishikawajima Harima Heavy Ind Co Ltd Gas replacement method for large tank and tank structure using the same
JP2001324093A (en) * 2000-05-18 2001-11-22 Nihonkai Lng Co Ltd LNG lorry shipping method
JP2001355800A (en) * 2000-06-14 2001-12-26 Nippon Applied Flow Kk Gas supply device
US20020152797A1 (en) * 2001-01-09 2002-10-24 Mcandrew James J.F. Gas delivery apparatus and method for monitoring a gas phase species therein
JP2006307936A (en) * 2005-04-27 2006-11-09 Kita Kyushu Lng Kk Lng shipping method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220086063A (en) * 2020-12-16 2022-06-23 주식회사 포스코 Gas purge system
KR102447393B1 (en) * 2020-12-16 2022-09-27 주식회사 포스코 gas purge system
WO2024190017A1 (en) * 2023-03-13 2024-09-19 三菱造船株式会社 Method for inspecting tank facility

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