JPH03177700A - Inspecting gas charging method for membrane type tank - Google Patents
Inspecting gas charging method for membrane type tankInfo
- Publication number
- JPH03177700A JPH03177700A JP31833689A JP31833689A JPH03177700A JP H03177700 A JPH03177700 A JP H03177700A JP 31833689 A JP31833689 A JP 31833689A JP 31833689 A JP31833689 A JP 31833689A JP H03177700 A JPH03177700 A JP H03177700A
- Authority
- JP
- Japan
- Prior art keywords
- membrane
- gas
- test gas
- back side
- inspecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims description 10
- 238000012360 testing method Methods 0.000 claims description 60
- 229910052736 halogen Inorganic materials 0.000 abstract description 3
- 150000002367 halogens Chemical class 0.000 abstract description 3
- 238000007689 inspection Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
Landscapes
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、ＬＮＧやＬＰＧなどの低塩液などが貯蔵さ
れるメンブレン式タンクのメンブレンの気密漏洩検査を
行うための検査ガス封入方法に関し、メンブレンの裏面
から大きな圧力をかけること無く、能率良く検査ガスを
封入できるようにしたものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a test gas filling method for performing an airtight leakage test on a membrane of a membrane tank in which low-salt liquids such as LNG and LPG are stored. This allows the test gas to be efficiently sealed without applying large pressure from the back side of the membrane.
［従来の技術］
ＬＮＧやＬＰＧなどの低温酸を貯蔵する低温タンクの形
式の一つにタンク本体を地面に埋設した地下式や半地下
式などのメンブレン式タンクがある。[Prior Art] One of the types of low-temperature tanks for storing low-temperature acids such as LNG and LPG is a membrane tank, such as an underground type or semi-underground type, in which the tank body is buried in the ground.
二のメンブレン式タンク１は、第１図に示すように、地
面２に形成した穴の周囲にコンクリートなどで外槽３を
構築し、この外槽３の内面にステンレスなどの１〜３
ｍｍの薄板で形成されたメンブレン４を張り付けて気密
構造の内槽とするとともに、これらの上部を屋根５で覆
って密閉溝遣としている。As shown in Fig. 1, the second membrane tank 1 is constructed by constructing an outer tank 3 made of concrete or the like around a hole formed in the ground 2.
A membrane 4 made of a thin plate of mm is attached to form an airtight inner tank, and the upper part of the tank is covered with a roof 5 to form an airtight groove.
このようなメンブレン式タンク１では、構築後使用前に
、メンブレン４のリークの有無を検査する必要がある。In such a membrane tank 1, it is necessary to inspect the membrane 4 for leakage after construction and before use.
このメンブレン４の検査を行う場合、通常の二重殻タン
クのように貯蔵状態と同様に検査ガスでメンブレン４内
を加圧してもメンブレン４の裏側（外槽３とメンブレン
４との間）で検査することができない。When inspecting this membrane 4, even if the inside of the membrane 4 is pressurized with test gas in the same way as in a storage state like in a normal double-shell tank, the back side of the membrane 4 (between the outer tank 3 and the membrane 4) cannot be inspected.
そこで、メンブレン４の裏側に検査ガスを封入してメン
ブレン４の内側で検査することが行われているが、メン
ブレン４の内側から加圧する場合と異なり、メンブレン
４自体が１〜３ＩＩＩＩ１１程度の薄板であるため高い
圧力をかけることが出来ず、１５ｍｍＡｑ程度しか圧力
をかけることができない。Therefore, inspection is carried out by sealing a test gas on the back side of the membrane 4, but unlike the case where pressure is applied from the inside of the membrane 4, the membrane 4 itself is a thin plate of about 1 to 3III11. Because of this, it is not possible to apply high pressure, and only about 15 mmAq can be applied.
このため、メンブレンの裏面への検査ガスの封入に当た
っては、メンブレン裏面の少なくとも一箇所を大気に開
放状態とし、対角位置などの別の少なくとも一箇所から
アモニアガスやハロゲンガスなどの検査ガスをわずかな
圧力をかけてメンブレン裏面に加わる圧力が許容圧力（
≦１５ｍｍＡｑ）以上とならないようにして供給するよ
うにしている。Therefore, when filling the back side of the membrane with a test gas, at least one part of the back side of the membrane is left open to the atmosphere, and a small amount of test gas such as ammonia gas or halogen gas is introduced from at least one other place, such as a diagonal position. The pressure applied to the back side of the membrane is the allowable pressure (
≦15 mmAq) or more.
［発明が解決しようとする課題］
このような検査ガスの封入方法では、検査ガスにわずか
な圧力しかかけることができないため、検査ガスをメン
ブレン裏面に拡散させにくいという問題がある。[Problems to be Solved by the Invention] In such a test gas filling method, only a slight pressure can be applied to the test gas, so there is a problem that it is difficult to diffuse the test gas to the back surface of the membrane.
また、メンブレンの裏面に検査に必要なガスを入れるの
に相当長時間かかるという問題もある。Another problem is that it takes a considerable amount of time to fill the back side of the membrane with the gas necessary for testing.
この発明は、かかる従来技術の問題点に鑑みてなされた
もので、メンブレンの裏面に過大な圧力をかけること無
く、短時間に能率的に検査ガスを封入することができる
メンブレン式タンクの検査ガス封入方法を提供しようと
するものである。This invention was made in view of the problems of the prior art, and it is a test gas in a membrane type tank that can efficiently fill the test gas in a short time without applying excessive pressure to the back side of the membrane. It is intended to provide an encapsulation method.
［課題を解決するための手段〕
上記従来技術が有する問題点を解決するため、この発明
のメンブレン式タンクの検査ガス封入方法は、メンブレ
ンの裏面を加圧状態とする場合には、その許容圧力は極
めて低いが、負圧状態とする場合には、低温液によって
加わる圧力にも耐えるように設計されていることから格
段に許容圧力が高いことに着目し、メンブレン式タンク
のメンブレン裏面に検査ガスを封入するに際し、メンブ
レン裏面の空気を吸引して負圧状態にした後、検査ガス
を吸い込ませてメンブレン裏面に拡散させ、次いで所定
の検査ガス圧力に加圧保持するようにしたことを特徴と
するものである。[Means for Solving the Problems] In order to solve the problems of the above-mentioned prior art, the method for filling a test gas into a membrane tank according to the present invention is to However, when creating a negative pressure state, we focused on the fact that the allowable pressure is much higher because it is designed to withstand the pressure exerted by low-temperature liquids. When enclosing the membrane, the air on the back side of the membrane is sucked to create a negative pressure state, and then the test gas is sucked in and diffused to the back side of the membrane, and then the pressure is maintained at a predetermined test gas pressure. It is something to do.
［作 用］
このメンブレン式タンクの検査ガス封入方法によれば、
メンブレンの裏面を真空吸引などによって負圧状態にし
、この負圧状態の部分に検査ガスを入れるようにし、検
査ガスに正圧をかけること無く、メンブレンの裏面全体
に拡散させるようにし、この後、所定の検査圧力に加圧
するようにしており、短時間に能率的に検査ガスの封入
ができるようにしている。[Function] According to this method of filling the test gas into the membrane tank,
The back side of the membrane is brought into a negative pressure state by vacuum suction, etc., and the test gas is introduced into this negative pressure area, and the test gas is diffused over the entire back side of the membrane without applying positive pressure.After this, The test gas is pressurized to a predetermined test pressure, allowing the test gas to be filled efficiently in a short time.
［実施例］
以下、この発明の一実施例を図面を参照しながら詳細に
説明する。[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図はこの発明のメンブレン式タンクの検査ガス封入
方法の一実施例にかかる原理説明図である。FIG. 1 is a diagram illustrating the principle of an embodiment of the method of filling a test gas into a membrane tank according to the present invention.
このメンブレン式タンク１には、メンブレン４のリーク
の有無を検査するため構築段階で、外槽３内に真空吸引
用の吸引管６が埋設配管され、その先端部がメンブレン
４の裏面４ａの側部下方に位置するようになっており、
他端部が外槽３の上部から地面２上に導出され、真空吸
引弁７を介して真空吸引装置８に接続されている。この
真空吸引用の吸引管６は、外槽３の円周方向に複数本（
例えば円周１２箇所）埋設され、均一にメンブレン４の
裏面の空気の吸引ができるようになっている。In this membrane tank 1, a suction pipe 6 for vacuum suction is buried in the outer tank 3 at the construction stage in order to check for leakage of the membrane 4, and its tip is on the side of the back surface 4a of the membrane 4. It is located at the bottom,
The other end is led out from the top of the outer tank 3 onto the ground 2 and connected to a vacuum suction device 8 via a vacuum suction valve 7. There are a plurality of suction pipes 6 for vacuum suction in the circumferential direction of the outer tank 3 (
For example, 12 locations around the circumference) are embedded so that air can be uniformly sucked from the back surface of the membrane 4.
また、外槽３内には、検査ガスを入れるためのガス封入
管９が埋設配管され、その先端部がメンブレン４の底部
中央付近に開口するようになっており、他端部が外槽３
の上部から地面２上に導出され、検査ガス供給弁１ｏを
介して検査ガス供給装置１１に接続されている。このガ
ス封入管９も外槽３の円周方向に複数本（例えば円周１
２箇所）埋設され、均一にメンブレン４の裏面４ａに検
査ガスを封入することができるようになっている。In addition, a gas-filled tube 9 for introducing a test gas is buried in the outer tank 3, and its tip opens near the center of the bottom of the membrane 4, and the other end is connected to the outer tank 3.
is led out onto the ground 2 from the upper part of the test gas, and is connected to a test gas supply device 11 via a test gas supply valve 1o. There are also a plurality of gas-filled tubes 9 in the circumferential direction of the outer tank 3 (for example, one per circumference).
2 locations), so that the test gas can be uniformly filled in the back surface 4a of the membrane 4.
このようなメンブレン式タンク１において、メンブレン
４のリークの有無の検査を行う場合には、次のようにし
て行われる。In such a membrane tank 1, when inspecting the membrane 4 for leakage, it is carried out as follows.
■ メンブレン４の裏面４ａに連通するガス封入管９の
検査ガス供給弁１ｏを閉じて、メンブレン４の裏面４ａ
を密閉状態とし、真空吸引弁７を開いて吸引管６を介し
て真空吸引装置８でメンブレン４の裏面４ａの空気を吸
引し、負圧状態にする。■ Close the inspection gas supply valve 1o of the gas-filled tube 9 that communicates with the back surface 4a of the membrane 4, and
is brought into a sealed state, the vacuum suction valve 7 is opened, and the air on the back surface 4a of the membrane 4 is suctioned by the vacuum suction device 8 through the suction pipe 6 to create a negative pressure state.
このメンブレン４の裏面４ａを負圧状態にする場合には
、加圧状態にする場合と異なり、メンブレン４内側に加
わる圧力として考えることが出来、例えば、１０，００
０ｏ＋ｓＡＱ程度の負圧にまで高めることが可能である
ことから、これ以下の適当な負圧状態にする。When the back surface 4a of the membrane 4 is brought into a negative pressure state, unlike when it is brought into a pressurized state, it can be considered as a pressure applied to the inside of the membrane 4, for example, 10,000
Since it is possible to increase the negative pressure to about 0o+sAQ, an appropriate negative pressure state below this level is set.
■ こうしてメンブレン４の裏面４ａの空気が排出され
て負圧状態となったところで、真空吸引弁７を閉じて、
検査ガス供給弁１０を開き、ガス封入管９を介して検査
ガス供給装置１１からアモニアガスやハロゲンガスなど
の検査ガスを吸い込ませる。■ When the air on the back surface 4a of the membrane 4 is discharged and a negative pressure is created, the vacuum suction valve 7 is closed.
The test gas supply valve 10 is opened, and a test gas such as ammonia gas or halogen gas is sucked in from the test gas supply device 11 through the gas filled pipe 9.
この検査ガスの封入に当たっては、検査ガス供給装置１
１から検査ガスを高い加圧状態で供給してメンブレン４
の裏面４ａが正圧状態とならないようにし、検査ガスを
微少圧力ないし大気圧程度としてメンブレン４の裏面４
ａの負圧を利用して検査ガスを入れるようにする。When filling this test gas, the test gas supply device 1
The test gas is supplied from 1 under high pressure to the membrane 4.
The back surface 4a of the membrane 4 is heated so that the back surface 4a of the membrane 4 is not in a positive pressure state, and the test gas is kept at a slight pressure to about atmospheric pressure.
The test gas is introduced using the negative pressure in a.
このように負圧状態のメンブレン４の裏面４ａに検査ガ
スを入れるようにすることで、従来のように空気と検査
ガスを置換しながら拡散させる必要がなく、短時間に検
査ガスが拡散され、メンブレン４の裏面４ａに均一に入
って行く。By introducing the test gas into the back surface 4a of the membrane 4 under negative pressure in this way, there is no need to diffuse the test gas while replacing air with the test gas as in the past, and the test gas can be diffused in a short time. It evenly enters the back surface 4a of the membrane 4.
■ こうしてメンブレン４の裏面４ａに検査ガスが、正
圧を生じさせること無く、封入されたところで、この検
査ガスを、メンブレン４の裏面４ａからの許容圧力の範
囲で、リークの検査に必要な圧力、例えば１０ ａ＋ｍ
Ａｑ程度の圧力に加圧する。■ Once the test gas is sealed in the back surface 4a of the membrane 4 without generating positive pressure, the test gas is applied to the back surface 4a of the membrane 4 within the allowable pressure range to the pressure necessary for leak testing. , for example 10 a+m
Pressurize to about Aq.
■ この後、メンブレン４の内側でリークの有無を検査
する。■ After this, inspect the inside of the membrane 4 for leaks.
このようにしてメンブレン式タンク１のメンブレン４の
裏面に検査ガスを封入することで、メンブレン４の裏面
４ａから正圧を加えること無く、短時間に能率内に検査
ガスを均一に拡散さ、せて封入することができる。By sealing the test gas on the back side of the membrane 4 of the membrane tank 1 in this way, the test gas can be diffused uniformly and efficiently in a short time without applying positive pressure from the back side 4a of the membrane 4. can be enclosed.
なお、上記実施例では、メンブレン式タンクとしては、
地下式のもので説明したが、これに限らず、地上式や半
地下式などのメンブレン式タンクにも同様に適用できる
ものである。In addition, in the above-mentioned example, as a membrane type tank,
Although the explanation has been given for an underground type tank, the present invention is not limited to this, and can be similarly applied to membrane type tanks such as an above ground type or a semi-underground type.
また、この発明の要旨を変更しない範囲で各構成要素に
変更を加えるようにすることも可能である。Further, it is also possible to make changes to each component without changing the gist of the invention.
［発明の効果］
以上、一実施例とともに具体的に説明したようにこの発
明のメンブレン式タンクの検査ガス封入方法によれば、
メンブレンの裏面を真空吸引などによって負圧状態にし
、この負圧状態の部分に検査ガスを入れるようにし、検
査ガスに正圧をかけること無く、メンブレンの裏面全体
に拡散させ、この後、所定の検査圧力に加圧するように
したので、短時間に能率的に検査ガスの封入ができる。[Effects of the Invention] As described above in detail with one embodiment, according to the method of filling a test gas into a membrane tank of the present invention,
The back side of the membrane is brought into a negative pressure state by vacuum suction, etc., and the test gas is introduced into the negative pressure area, and the test gas is diffused over the entire back side of the membrane without applying positive pressure. Since the pressure is increased to the test pressure, the test gas can be filled efficiently in a short time.
また、従来のように空気と検査ガスを置換しながら拡散
させる必要がなく、短時間に検査ガスが拡散され、メン
ブレンの裏面に均一に入れることができる。In addition, unlike the conventional method, there is no need to diffuse the test gas while replacing it with air, and the test gas can be diffused in a short time and uniformly introduced onto the back surface of the membrane.
さらに、メンブレンの裏面に正圧が加わらないので、メ
ンブレンの破損のおそれがなく、安全にリークの検査が
できる。Furthermore, since no positive pressure is applied to the back side of the membrane, there is no risk of membrane damage and leakage inspection can be performed safely.
第１図はこの発明のメンブレン式タンクの検査ガス封入
方法の一実施例にかかる原理説明図である。
１：メンブレン式タンク、２：地面、３：コンクリート
の外槽、４：メンブレン、４ａ：メンブレンの裏面、５
：屋根、６：吸引管、７：真空吸引弁、８：真空吸引装
置、９：ガス封入管、１ｏ：検査ガス供給弁、１１：検
査ガス供給装置。FIG. 1 is a diagram illustrating the principle of an embodiment of the method of filling a test gas into a membrane tank according to the present invention. 1: Membrane tank, 2: Ground, 3: Concrete outer tank, 4: Membrane, 4a: Back side of membrane, 5
: Roof, 6: Suction pipe, 7: Vacuum suction valve, 8: Vacuum suction device, 9: Gas filled pipe, 1o: Test gas supply valve, 11: Test gas supply device.
Claims (1)
するに際し、メンブレン裏面の空気を吸引して負圧状態
にした後、検査ガスを吸い込ませてメンブレン裏面に拡
散させ、次いで所定の検査ガス圧力に加圧保持するよう
にしたことを特徴とするメンブレン式タンクの検査ガス
封入方法。When filling the test gas into the back of the membrane of a membrane tank, the air on the back of the membrane is sucked to create a negative pressure state, then the test gas is sucked in and diffused to the back of the membrane, and then pressurized to a predetermined test gas pressure. A method for filling a test gas into a membrane tank, characterized by holding the test gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31833689A JPH0752000B2 (en) | 1989-12-07 | 1989-12-07 | Inspection gas filling method for membrane tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31833689A JPH0752000B2 (en) | 1989-12-07 | 1989-12-07 | Inspection gas filling method for membrane tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03177700A true JPH03177700A (en) | 1991-08-01 |
| JPH0752000B2 JPH0752000B2 (en) | 1995-06-05 |
Family
ID=18098028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31833689A Expired - Lifetime JPH0752000B2 (en) | 1989-12-07 | 1989-12-07 | Inspection gas filling method for membrane tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0752000B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292282A (en) * | 2006-04-20 | 2007-11-08 | Korea Gas Corp | Liquefied natural gas storage tank with improved heat insulated structure, and manufacturing method |
| CN103498836A (en) * | 2013-09-03 | 2014-01-08 | 宜兴泰恩博能燃气设备有限公司 | Oil return process completion detection device for CNG hydraulic flat pusher station |
| US10132446B2 (en) | 2008-03-03 | 2018-11-20 | Samsung Heavy Ind. Co., Ltd | Reinforcing member for corrugated membrane of LNG cargo tank, membrane assembly having the reinforcing member and method for constructing the same |
-
1989
- 1989-12-07 JP JP31833689A patent/JPH0752000B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292282A (en) * | 2006-04-20 | 2007-11-08 | Korea Gas Corp | Liquefied natural gas storage tank with improved heat insulated structure, and manufacturing method |
| US10132446B2 (en) | 2008-03-03 | 2018-11-20 | Samsung Heavy Ind. Co., Ltd | Reinforcing member for corrugated membrane of LNG cargo tank, membrane assembly having the reinforcing member and method for constructing the same |
| CN103498836A (en) * | 2013-09-03 | 2014-01-08 | 宜兴泰恩博能燃气设备有限公司 | Oil return process completion detection device for CNG hydraulic flat pusher station |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0752000B2 (en) | 1995-06-05 |
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