【０００１】[0001]
【産業上の利用分野】本発明は、放射性気体を内包する
機器，配管等において、系外への放射性気体の飛散を防
止するために系内に負圧に保つタングベント処理系に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tongue vent treatment system which keeps a negative pressure in a system in equipment, pipes, etc. containing a radioactive gas to prevent the radioactive gas from scattering outside the system.
【０００２】[0002]
【従来の技術】従来のタンクベント処理系の負圧度制御
方法は、系内負圧度が規定レベルを超える前に、タンク
ベントフィルタ入口側に設けた逆止弁を介して雰囲気の
空気を系内に注入することで、系内の負圧度上昇を抑制
している（特開平2−52840号公報）。2. Description of the Related Art A conventional method for controlling a negative pressure in a tank vent treatment system is to remove atmospheric air through a check valve provided on the inlet side of the tank vent filter before the negative pressure in the system exceeds a specified level. By injecting into the system, the negative pressure increase in the system is suppressed (JP-A-2-52840).
【０００３】[0003]
【発明が解決しようとする課題】従来のタンクベント処
理系負圧度制御方法では、系内の負圧度があるレベルに
達すると、その差圧で逆止弁が開いて雰囲気の空気を系
内に注入しているが、逆止弁では雰囲気中のごみの噛み
込みによる動作不良、又弁内ヒンジ部の固着による動作
不良等が懸念される。さらには逆止弁の作動圧力が一定
でなく、変動するため系内負圧度を制御する上で問題が
ある。In the conventional negative pressure control method for a tank vent treatment system, when the negative pressure in the system reaches a certain level, the check valve is opened by the pressure difference and the atmospheric air is removed. Although it is injected into the check valve, there is concern that the check valve may malfunction due to dust trapped in the atmosphere, or malfunction due to sticking of the valve hinge. Furthermore, the operating pressure of the check valve is not constant and fluctuates, which causes a problem in controlling the negative pressure in the system.
【０００４】本発明の目的は、これらの問題点を解決す
ることにある。An object of the present invention is to solve these problems.
【０００５】[0005]
【課題を解決するための手段】本発明の第一の手段は、
系内負圧度で系内へ雰囲気空気を注入すべく、系内負圧
度を計測するための圧力スイッチを設ける。又、本圧力
スイッチからの信号で連動する空気作動弁を設ける。The first means of the present invention is as follows:
A pressure switch for measuring the negative pressure in the system is provided to inject atmospheric air into the system at the negative pressure in the system. In addition, an air-operated valve that interlocks with the signal from this pressure switch is provided.
【０００６】本発明の第二の手段は、空気作動弁のゴミ
噛み込みによる動作不良を回避すべく、系内への注入空
気を清浄でかつ減圧された圧縮空気とする。The second means of the present invention uses clean and decompressed compressed air as the air to be injected into the system in order to avoid malfunction due to the trapping of dust in the air operated valve.
【０００７】本発明の第三の手段は、空気作動弁のごみ
噛み込みによる動作不良を回避すべく、雰囲気空気注入
ライン上に空気ろ過器を設ける。The third means of the present invention is to provide an air filter on the atmospheric air injection line in order to avoid malfunction due to dust trapping in the air operated valve.
【０００８】[0008]
【作用】タンクベントフィルタ入口側に設ける圧力スイ
ッチは、系内の負圧度を計測し、負圧度が規定の値に達
したなら圧力スイッチが作動して、空気注入ライン上の
空気作動弁を開く。空気の注入により系内負圧度が低下
すると、再び、圧力スイッチが作動して空気作動弁を閉
じて系内への空気注入が止み、常に、所定の系内負圧度
で系内への空気注入が可能となる。[Function] The pressure switch installed on the inlet side of the tank vent filter measures the negative pressure in the system, and when the negative pressure reaches the specified value, the pressure switch is activated and the air operated valve on the air injection line is activated. open. When the negative pressure in the system decreases due to the injection of air, the pressure switch is activated again to close the air-actuated valve to stop the air injection into the system, and the negative pressure in the system is always maintained at a predetermined negative pressure in the system. Injecting air is possible.
【０００９】減圧された圧縮空気を系内に注入するの
は、発電プラントで通例別に用意されている圧縮空気が
清浄であり、空気作動弁がごみの噛み込みにより動作不
良となるのを防ぐ。Injecting decompressed compressed air into the system prevents the compressed air, which is usually prepared separately in the power plant, from being clean, and prevents the air-operated valve from malfunctioning due to the trapping of dust.
【００１０】雰囲気空気注入ライン上に空気ろ過器を設
けるのは、同じく空気作動弁がごみの噛み込みにより動
作不良となるのを防ぐ。Providing an air filter on the atmospheric air injection line also prevents the air-actuated valve from malfunctioning due to dust trapping.
【００１１】[0011]
【実施例】図１で、１は圧力スイッチを、２は空気作動
弁を、３は空気注入配管を、４はタンクベントフィルタ
を、５はタンクベント系配管を６はタンクベント系機器
を、７はタンクベント系排風機を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, 1 is a pressure switch, 2 is an air operated valve, 3 is an air injection pipe, 4 is a tank vent filter, 5 is a tank vent system pipe, 6 is a tank vent system device, Reference numeral 7 indicates a tank vent system air exhauster.
【００１２】排風機７がタンクベント系機器６，タンク
ベント系配管５及びタンクベントフィルタ４内の空気を
吸引することにより、それらが内包する空間部を負圧に
し、これによりこれらが内包する放射性気体が系外に放
出されることを防いでいる。圧力スイッチ１は系内の負
圧度がタンクベント系機器の強度と定まる許容最大負圧
度に近づくと作動し、圧力スイッチからの電気信号によ
り空気作動弁２が開いて、空気注入配管３を介して雰囲
気空気が系内に注入される。これにより系内の負圧度が
許容最大負圧度以上になることを防ぎ、タンクベント系
機器が損傷することを未然に防止している。The air exhauster 7 sucks the air in the tank vent system device 6, the tank vent system pipe 5 and the tank vent filter 4 to make the space part contained therein a negative pressure, thereby causing the radioactiveness contained therein. It prevents the gas from being released outside the system. The pressure switch 1 operates when the negative pressure in the system approaches the maximum allowable negative pressure, which is determined by the strength of the tank vent system device, and the electric signal from the pressure switch opens the air actuated valve 2 to open the air injection pipe 3. Ambient air is injected into the system via. This prevents the negative pressure in the system from exceeding the maximum allowable negative pressure and prevents damage to the tank vent system equipment.
【００１３】図２で、８は減圧弁を９は圧縮空気配管を
示す。In FIG. 2, 8 is a pressure reducing valve and 9 is a compressed air pipe.
【００１４】排風機７がタンクベント系機器６，タンク
ベント系配管５のタンクベントフィルタ内の空気を吸引
することにより、それらが内包する空間部を負圧にし、
これによりこれらが内包する放射性気体が系外に放出さ
れることを防いでいる。The air exhauster 7 sucks the air in the tank vent filter of the tank vent system equipment 6 and the tank vent system pipe 5 to make the space part enclosed therein a negative pressure,
This prevents the radioactive gas contained in them from being released to the outside of the system.
【００１５】圧力スイッチ１は系内の負圧度がタンクベ
ント系機器の強度上定まる許容最大負圧度に近づくと作
動し、圧力スイッチからの電気信号により空気作動弁２
が開いて、空気注入配管３を介して減圧弁８により所定
の圧力に減圧された圧縮空気が系内に注入される。これ
により系内の負圧度が許容最大負圧度以上になることを
防ぎ、もってタンクベント系機器が損傷することを未然
に防止している。The pressure switch 1 is activated when the negative pressure in the system approaches the maximum allowable negative pressure determined by the strength of the tank vent system equipment.
Is opened, and compressed air whose pressure is reduced to a predetermined pressure by the pressure reducing valve 8 is injected into the system through the air injection pipe 3. This prevents the negative pressure in the system from exceeding the maximum allowable negative pressure, thereby preventing damage to the tank vent system equipment.
【００１６】図３で、１０は空気ろ過器を示す。In FIG. 3, 10 indicates an air filter.
【００１７】排風機７がタンクベント系機器６，タンク
ベント系配管５及びタンクベントフィルタ４内の空気を
吸引することにより、それらが内包する空間部を負圧に
し、これによりこれらが内包する放射性気体が系外に放
出されることを防いでいる。圧力スイッチ１は系内の負
圧度がタンクベント系機器６の強度上定まる許容最大負
圧度に近づくと作動し、圧力スイッチ１からの電気信号
により空気作動弁２が開いて、空気注入配管３を介して
空気ろ過器１０により清浄となった雰囲気空気が系内に
注入されるこれにより系内の負圧度が許容最大負圧度以
上になることを防ぎ、もってタンクベント系機器が損傷
することを未然に防いでいる。The air exhauster 7 sucks the air in the tank vent system device 6, the tank vent system pipe 5 and the tank vent filter 4 to make the space part contained therein a negative pressure, and thereby the radioactive space contained therein. It prevents the gas from being released outside the system. The pressure switch 1 operates when the negative pressure in the system approaches the maximum allowable negative pressure determined by the strength of the tank vent system device 6, and the electric signal from the pressure switch 1 opens the air actuated valve 2 to open the air injection pipe. Atmospheric air purified by the air filter 10 is injected into the system through the air filter 3, thereby preventing the negative pressure in the system from exceeding the allowable maximum negative pressure and damaging the tank vent system device. It prevents you from doing it.
【００１８】[0018]
【発明の効果】本発明によれば、圧力スイッチを設ける
ことに拠り、一定の系内負圧度時に、雰囲気空気を系内
に注入できる。According to the present invention, by providing the pressure switch, atmospheric air can be injected into the system at a constant negative pressure in the system.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の第一の実施例のタンクベント処理系負
圧度制御装置のシステム系統図。FIG. 1 is a system diagram of a tank vent treatment system negative pressure control device according to a first embodiment of the present invention.
【図２】本発明の第二の実施例のタンクベント処理系負
圧度制御装置のシステム系統図。FIG. 2 is a system diagram of a tank vent treatment system negative pressure control device according to a second embodiment of the present invention.
【図３】本発明の第三の実施例のタンクベント処理系負
圧度制御装置のシステム系統図。FIG. 3 is a system system diagram of a tank vent treatment system negative pressure control device according to a third embodiment of the present invention.
１…圧力スイッチ、２…空気作動弁、３…空気注入配
管。1 ... Pressure switch, 2 ... Air operated valve, 3 ... Air injection piping.
─────────────────────────────────────────────────────フロントページの続き (72)発明者 本田 斉 茨城県日立市幸町三丁目２番１号 日立エ ンジニアリング株式会社内 ─────────────────────────────────────────────────── ───Continued front page (72) Inventor Hitoshi Honda Hitachi 2-3-1, Saiwaicho, Hitachi-shi, Ibaraki Engineering Co., Ltd.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3172140AJPH0519093A (en) | 1991-07-12 | 1991-07-12 | Tank vent treatment system negative pressure control device |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3172140AJPH0519093A (en) | 1991-07-12 | 1991-07-12 | Tank vent treatment system negative pressure control device |
| Publication Number | Publication Date |
|---|---|
| JPH0519093Atrue JPH0519093A (en) | 1993-01-26 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3172140APendingJPH0519093A (en) | 1991-07-12 | 1991-07-12 | Tank vent treatment system negative pressure control device |
| Country | Link |
|---|---|
| JP (1) | JPH0519093A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691696A (en)* | 1995-09-08 | 1997-11-25 | Federal Signal Corporation | System and method for broadcasting colored light for emergency signals |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5691696A (en)* | 1995-09-08 | 1997-11-25 | Federal Signal Corporation | System and method for broadcasting colored light for emergency signals |
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