JPS59106800A - Method of controlling liquefied gas evaporating device - Google Patents

Method of controlling liquefied gas evaporating device

Info

Publication number
JPS59106800A
JPS59106800A JP57217441A JP21744182A JPS59106800A JP S59106800 A JPS59106800 A JP S59106800A JP 57217441 A JP57217441 A JP 57217441A JP 21744182 A JP21744182 A JP 21744182A JP S59106800 A JPS59106800 A JP S59106800A
Authority
JP
Japan
Prior art keywords
gas
liquefied gas
flow
evaporator
signal line
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.)
Pending
Application number
JP57217441A
Other languages
Japanese (ja)
Inventor
Takeshi Nanjo
南條　雄
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Zosen Corp
Original Assignee
Hitachi Zosen Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Zosen Corp filed Critical Hitachi Zosen Corp
Priority to JP57217441A priority Critical patent/JPS59106800A/en
Publication of JPS59106800A publication Critical patent/JPS59106800A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F17C9/00—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure
    • F17C9/02—Methods or apparatus for discharging liquefied or solidified gases from vessels not under pressure with change of state, e.g. vaporisation
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0128—Shape spherical or elliptical
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/0393—Localisation of heat exchange separate using a vaporiser
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0408—Level of content in the vessel
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0443—Flow or movement of content
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0636—Flow or movement of content

Abstract

PURPOSE:To satisfy the followability of a liquefied gas evaporating device with respect to variations in load, disturbanses and as well variations in the ratio of gas mixture, by detecting the content of a gas holder to adjust the flow of heating fluid fed to an evaporator, and as well by detecting the flow of gas fed from the gas holder to a fuel consumption device and the liquid level of a liquefied gas container to adjust the flow of liquefied gas. CONSTITUTION:A container 1 for temporarily storing therein liquefied gas 2 from a storage tank, has a capacity corresponding to a usual consumption for a couple of minutes. An evaporator 7 evaporates liquefied gas 2 from the container 1, and the gas holder 11 temporarily stores the evaporated gas. A flow adjusting device 17 disposed in a flow adjusting valve 15, is connected with a pressure signal line 18 from a pipe line 14 in the part upstream of a fuel consumption device and with a flow signal line 19 for delivering a gas flow signal from the pipe line 14 in accordance with the opening degree of the valve 15, etc., and is communicated with a level signal line 20 from a level detector 3 and as well with a flow control valve 4. Meanwhile, a pressure detector 13 is communicated with a flow control valve 8 through a pressure signal line 21.

Description

【発明の詳細な説明】 本発明は液化ガス気化装置の制御方法に関する。[Detailed description of the invention] The present invention relates to a method for controlling a liquefied gas vaporizer.

発電所のガスタービン発′成機またはボイラに供給され
る燃料ガスとしての液化ガスは、たとえばプロパンは約
−４２℃、ブタンは約−５°Ｃにて低温タンクに貯蔵さ
れており、これが必要に応じてガス化され、燃料として
供される。通常、発電所では、−日における時間帯や季
節等によりイカ消費量が異なることに伴って、燃料消費
量が大幅に変動する。また、燃料として供される液化ガ
スは、たとえば前記プロパン、ブタンをそれぞれ蒸発・
ガス化後所定の比率に混合しており、その比率制御が必
要となる。Liquefied gases used as fuel gases supplied to gas turbine generators or boilers at power plants are stored in low-temperature tanks at, for example, propane at approximately -42°C and butane at approximately -5°C. Depending on the situation, it is gasified and used as fuel. Normally, at a power plant, the amount of fuel consumed fluctuates significantly as the amount of squid consumed differs depending on the time of day, season, etc. In addition, the liquefied gas used as fuel can be, for example, the propane and butane that are evaporated and
After gasification, they are mixed at a predetermined ratio, which requires ratio control.

従来の気化用熱交換器として、スチームを熱源とし、多
管円筒型熱交換器（シェルアンドチューブ式）、精溜塔
にガス蒸発器を備えたものがある。Conventional heat exchangers for vaporization include those that use steam as a heat source, include a multi-tube cylindrical heat exchanger (shell and tube type), and a rectification column equipped with a gas evaporator.

ところが、このような従来のものでは、前述のような負
荷変動に対する追従性、外乱に対する追従性、プロパン
、ブタンのような混合ガスの比率変動に対する追従性等
に難点がある。However, such conventional devices have difficulties in following the aforementioned load fluctuations, disturbances, and ratio fluctuations of mixed gases such as propane and butane.

そこで本発明は、上記のような負荷変ａ、外乱、混合ガ
スの比率変動に対する追従性を良好にすることを目的と
するものである。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to improve the ability to follow the above-mentioned load changes a, disturbances, and mixed gas ratio changes.

この目的を達成するため本発明は、液化ガスドラムＫａ
　化ガスを貯留し、この液化ガスドラムからの液化ガス
を蒸発器により気化させ、この蒸発器からのガスをガス
ホルダに貯留した後に燃料使用装置に送出し、前記燃料
使用装置の手前におけるガス圧を検出して前記ガスホル
ダから燃料使用装置へのガス流量を調節し、前記ガスホ
ルダの内圧を検出して前記蒸発器への加熱流体の流量を
調節し、さらに前記ガスホルダから燃料使用装置へのガ
ス流量と前記液化ガスドラムの液位とを検出してこの液
化ガスドラムへ供給する液化ガスの流量を調節するもの
である。To achieve this objective, the present invention provides a liquefied gas drum Ka
The liquefied gas from the liquefied gas drum is vaporized by an evaporator, the gas from the evaporator is stored in a gas holder, and then sent to a fuel using device, and the gas pressure in front of the fuel using device is detected. to adjust the gas flow rate from the gas holder to the fuel using device, detect the internal pressure of the gas holder to adjust the flow rate of the heating fluid to the evaporator, and further adjust the gas flow rate from the gas holder to the fuel using device and the gas flow rate from the gas holder to the fuel using device. The liquid level of the liquefied gas drum is detected and the flow rate of liquefied gas supplied to the liquefied gas drum is adjusted.

したがって、負荷変動、外乱、ガスの比率変動等に対し
て蒸発器が追従するまでの間に燃料使用装置側の要求を
満たし得るだけのガス圧力と容量とをガスホルダ内に保
有させておくことができ、しかもこの変動に対し迅速か
つ確実に応答可能となるものである。Therefore, it is necessary to maintain enough gas pressure and capacity in the gas holder to satisfy the demands of the fuel-using device until the evaporator follows load fluctuations, disturbances, gas ratio fluctuations, etc. Moreover, it is possible to respond quickly and reliably to these fluctuations.

以丁、本発明の詳細な説明する。図面において、（１）
は図外の貯蔵タンクからの液化ガス（２）が供給されて
一時貯留される液化ガスドラムであり、レベル検出器（
３）が接続されるとともに、その入口近傍には流量調節
弁（４）が設けられている。ドラム（υには、通常の使
用時において２〜６分間使用できる程度の液化ガス（２
）が保有されている。ドラム（υの底部（５）からの管
路（６）は、蒸発器（７）に接続されている。蒸発器（
７）内には、流量調節弁（８）を有する管路（９）から
の加熱流体としてのスチームが通る熱交換部００が設け
られ、ドラム（υからの液化ガス（２）を気化可能なよ
うに構成されている。αυは蒸発器（７）からのガスを
管路＠によシ受けて一旦貯留するガスホルダであシ、圧
力検出器Ｑ３が接続されるとともにポイヲ等図外の燃料
使用装置への管路Ｃｌ４１が接続されている。Ｕ！１９
は管路αΦの途中に設けられた流量調節弁である。また
σＱはガスホルダｆ、１１）内で凝縮して生じた液化ガ
スをドラム（υに戻すための戻し管である。The present invention will now be described in detail. In the drawing, (1)
is a liquefied gas drum to which liquefied gas (2) is supplied from a storage tank (not shown) and is temporarily stored.
3) is connected, and a flow rate control valve (4) is provided near its inlet. The drum (υ) contains enough liquefied gas (2 to 6 minutes during normal use).
) are held. The line (6) from the bottom (5) of the drum (υ) is connected to the evaporator (7).
7) is provided with a heat exchange section 00 through which steam as a heated fluid passes from a pipe line (9) having a flow rate control valve (8), and is capable of vaporizing the liquefied gas (2) from the drum (υ). αυ is a gas holder that receives gas from the evaporator (7) through a pipe @ and temporarily stores it, and a pressure detector Q3 is connected to it, as well as to prevent the use of unillustrated fuel such as leakage. Conduit Cl41 to the device is connected. U!19
is a flow control valve provided in the middle of the pipe line αΦ. Further, σQ is a return pipe for returning the liquefied gas condensed in the gas holder f, 11) to the drum (υ).

流量調節弁９時には流量調節装置αηが対応して設けら
れており、前記燃料使用装置の手前における管路α◆か
らの圧力信号フィン（至）が接続されるととも［、との
弁（へ）の開度等にもとづく管路１．１→のガス流量信
号を出力するだめの流量信号ライフル０が接続されてい
る。この流量信号ライン（ｌｉは、前記レベル検出！　
Ｌ３Ｊからのレベル信号ラインに）とともに、流量調節
弁（４）に接続されている。一方、ｔ２ｊノは圧力検出
器０から流量調節弁（８）への圧力信号ラインである。At the time of the flow rate control valve 9, a flow rate control device αη is provided correspondingly, and when the pressure signal fin (to) from the pipe α ) is connected to a flow rate signal rifle 0 which outputs a gas flow rate signal of the pipe 1.1→ based on the opening degree of the pipe 1.1. This flow rate signal line (li is the level detection!
to the level signal line from L3J) as well as to the flow control valve (4). On the other hand, t2j is a pressure signal line from the pressure detector 0 to the flow control valve (8).

通常の運転時において、図外の燃料使用装置にてガスホ
ルダｕ′Ｏからのガスを清貧すれば、それに応じてこの
ガスホルダ内υ内の圧力が低Ｆｔ、、Ｉｆ圧力検出器６
）によりこれを検出して流量調節弁（８）を開く。する
と、蒸発器（７）にスチームが供給され、こ（７）　Ｍ
　発器（７）内の液化ガスが気化されてガスホルダσυ
に補充される。これによシトラム（υ内の液位が低１ζ
−するため、レベル検出器（３）でこれを検出し。During normal operation, if the gas from the gas holder u'O is depleted by a fuel using device (not shown), the pressure inside this gas holder υ will be low Ft, If pressure detector 6
) detects this and opens the flow control valve (8). Then, steam is supplied to the evaporator (7), and this (7) M
The liquefied gas in the generator (7) is vaporized and the gas holder συ
will be replenished. This causes citrum (the liquid level in υ is low 1ζ
-This is detected by the level detector (3).

流量調節弁（４）をＩＢいて新たな液化ガス（２）を供
給する。The flow control valve (4) is turned on to supply new liquefied gas (2).

いま、前旧燃料使用装置において負荷変動が生じ、ガス
ホルダμηからのガスが多量に消費されると、蒸発器（
７）がこれに追従するのに時間を要することになるが、
ガスホルダ（ロ）の容量および内部ガス圧に余裕を持た
せであるため、このガスホルダαυの作用によりこれを
補償することが可能となる。Now, when a load change occurs in the equipment using the previous fuel and a large amount of gas from the gas holder μη is consumed, the evaporator (
7) will take time to follow this, but
Since the capacity and internal gas pressure of the gas holder (b) are designed to have a margin, this can be compensated for by the action of the gas holder αυ.

また上記負荷変動により管路（１４）の内圧が丁が９、
流量調節弁ＱＱが大きく開かれることになるため、これ
に応じた信号が流量信号ライン帆やに圧力され、流量調
節弁（４）が直ちに開動されて、必要な鼠の液化ガス（
５）が迅速、確実にドラム（１）内に供給されることに
なる。In addition, due to the above-mentioned load fluctuation, the internal pressure of the pipe line (14) decreased to 9.
Since the flow rate control valve QQ will be opened wide, a corresponding signal will be applied to the flow rate signal line, and the flow rate control valve (4) will be immediately opened to release the necessary liquefied gas (
5) can be quickly and reliably supplied into the drum (1).

なお、発電所では〕ｍ常プロパンとブタンと全混合させ
て燃焼させているため、上記各ガスごとに図示の装置を
設ける必要がある。このときは、両ガスの混合装置の手
前に管路Ｕ＜の圧力検出器を設け、これに圧力信号フィ
ン麿を接続する。すると。Note that in a power plant, propane and butane are completely mixed and combusted, so it is necessary to provide the equipment shown in the figure for each of the above gases. At this time, a pressure detector in the pipe line U is provided in front of the mixing device for both gases, and a pressure signal fin is connected to this. Then.

両ガスの混合比率を変動させた場合であっても良好にこ
れに対処することができる。Even if the mixing ratio of both gases is varied, this can be handled satisfactorily.

以上述べたように本発明によると、、＠荷変動、外乱、
ガ□スの比率変ＴＪｄＪ等１＋Ｃ対して蒸発とｇが追従
するまでの間に燃料使用装置側の要求を満たし得るだけ
のガス圧力と容量とをガスホルダ内に保有させておくこ
とができ、しかもこの変動に対し迅速力Ａつｍ実に応答
可能となるものである。As described above, according to the present invention, @load fluctuation, disturbance,
It is possible to hold enough gas pressure and capacity in the gas holder to satisfy the requirements of the fuel-using device until evaporation and g follow up with respect to 1+C, such as gas ratio change TJdJ, and moreover. This makes it possible to respond quickly to these fluctuations.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明方法を実施するだめの装置の一例を示す概
略構成図である。 、五〕・・・液化ガスドラム、（２）・・・液化ガス、
（４）Ｆ８）　（，１５・・・流量調節弁、（７）・・
・蒸発器、０１）・・・ガスホルダ、（至）・・・圧力
１ｄ号ライン、０す・・・流量信号ライン、四・・・レ
ベル信号ライン、圓・・・圧力１ｄ号ライン代理人　　
　森　　木　　義　　弘 ６６７The drawing is a schematic diagram showing an example of an apparatus for carrying out the method of the present invention. , 5]...Liquefied gas drum, (2)...Liquefied gas,
(4) F8) (,15...flow control valve, (7)...
・Evaporator, 01)...Gas holder, (To)...Pressure No. 1d line, 0su...Flow rate signal line, 4...Level signal line, En...Pressure No. 1d line agent
Yoshihiro Moriki667

Claims (1)

【特許請求の範囲】[Claims] １、液化ガスドラムに液化ガスを貯留し、この液化ガス
ドラムからの液化ガスを蒸発器により気化させ、この蒸
発器からのガスをガスホルダに貯留した後に燃料使用装
置に送品し、前記燃料使用装置の手前におけるガス圧を
検出して前記ガスホルダから燃料使用装置へのガス流量
を調節し、前記ガスホルダの内在′ｆｔ検出して前記蒸
発器への加熱流体の流量を調節し、さらに前記ガスホル
ダから燃料使用装置へのガス流量と前記液化ガスドラム
の液位とを検出してこの液化ガスドラムへ供給する液化
ガスの流量を調節することを特徴をする液化ガス気化装
置の制御方法。1. Store liquefied gas in a liquefied gas drum, vaporize the liquefied gas from the liquefied gas drum in an evaporator, store the gas from the evaporator in a gas holder, and then send it to a fuel using device. The gas pressure at the front side is detected to adjust the gas flow rate from the gas holder to the fuel usage device, the internal pressure of the gas holder is detected to adjust the flow rate of the heated fluid to the evaporator, and the fuel usage from the gas holder is adjusted. A method for controlling a liquefied gas vaporization device, comprising: detecting a gas flow rate to the device and a liquid level in the liquefied gas drum to adjust the flow rate of liquefied gas supplied to the liquefied gas drum.
JP57217441A 1982-12-10 1982-12-10 Method of controlling liquefied gas evaporating device Pending JPS59106800A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57217441A JPS59106800A (en) 1982-12-10 1982-12-10 Method of controlling liquefied gas evaporating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57217441A JPS59106800A (en) 1982-12-10 1982-12-10 Method of controlling liquefied gas evaporating device

Publications (1)

Publication Number Publication Date
JPS59106800A true JPS59106800A (en) 1984-06-20

Family

ID=16704275

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57217441A Pending JPS59106800A (en) 1982-12-10 1982-12-10 Method of controlling liquefied gas evaporating device

Country Status (1)

Country Link
JP (1) JPS59106800A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6140861A (en) * 1984-07-31 1986-02-27 菊水化学工業株式会社 Mortar composition
JPH03117799A (en) * 1989-09-07 1991-05-20 Union Carbide Ind Gases Technol Corp High pressure gas feed equipment
JP2014119317A (en) * 2012-12-14 2014-06-30 Ihi Corp Liquid level measuring device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6140861A (en) * 1984-07-31 1986-02-27 菊水化学工業株式会社 Mortar composition
JPH03117799A (en) * 1989-09-07 1991-05-20 Union Carbide Ind Gases Technol Corp High pressure gas feed equipment
JP2014119317A (en) * 2012-12-14 2014-06-30 Ihi Corp Liquid level measuring device

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