JP7691144B2

JP7691144B2 - Liquid Inventory Management System

Info

Publication number: JP7691144B2
Application number: JP2023086470A
Authority: JP
Inventors: 信介前芝
Original assignee: Showa Kiki Kogyo Co Ltd
Current assignee: Showa Kiki Kogyo Co Ltd
Priority date: 2023-05-25
Filing date: 2023-05-25
Publication date: 2025-06-11
Anticipated expiration: 2043-05-25
Also published as: JP2024169204A

Description

本発明は、ガソリンスタンド等に設置されている石油貯蔵タンク（通常は地下タンク）や化学工場等に設置されている溶剤貯蔵タンク等の、液体貯蔵タンクに液体を注入する液体注入系統及び液体貯蔵タンクから液体を排出する液体排出系統における異常発生箇所を検知するために用いられる液体在庫管理システムに関する。 The present invention relates to a liquid inventory management system used to detect abnormalities in a liquid injection system that injects liquid into a liquid storage tank, such as an oil storage tank (usually an underground tank) installed at a gas station or the like, or a solvent storage tank installed at a chemical plant, etc., and in a liquid discharge system that discharges liquid from the liquid storage tank.

従来、液体貯蔵タンクの漏えい等を検知するため、各種の液面検知装置や在庫管理データ等の分析に基づいて判定する液体在庫管理システムが利用されている。
例えば、本出願人は、特許文献１（特開２００５－３５１７６７号公報）に記載されているように、液体貯蔵タンク内の油面レベルを検出するための第１のフロートと水面レベルを検出するための第２のフロートとを備え、液面レベルの単位時間当たりの変動が所定量以上であるか否かを演算し、その演算結果と水面レベルの検出結果に基づいて、液体貯蔵タンク内に水が溜まっているか否かを正確に検知することのできる磁歪式液面計を開発している（特に、段落０００８～００１１、００１７及び図１を参照）。
また、特許文献２（特開２０１６－１５６６９９号公報）には、車両に燃料を供給するサービスステーション(SS)における燃料の貯蔵システムの異常を検出する異常検知方法及び異常検知装置であって、タンクローリー車(106)から貯蔵タンク(102)への注入量、貯蔵タンク(102)内に貯蔵される燃料油の増減量、及び計量機(104)から車両への注出量等に基づいて、燃料の漏洩或いは水混入の可能性及びその発生箇所を判定する点が記載されている（特に、段落００２２、００３２～００４４及び図１を参照）。
さらに、特許文献３（特開２０１３－４３６４８号公報）には、燃料油を貯留する地下タンク(20)を備えた給油所における記録帳データと、該記録帳データを統計処理して得られた統計分析データと、燃料油の静止時の液面変動データとを記録し、記録帳データ、統計分析データ及び静止時の液面変動データの少なくとも一つが異常であることを検出したときに地下タンクに燃料油の漏洩があると判定し報知する在庫管理システムが記載されている（特に、要約、段落００２２、００３２～００５５及び図１を参照）。 Conventionally, in order to detect leakage or the like from liquid storage tanks, various liquid level detection devices and liquid inventory management systems that make determinations based on the analysis of inventory management data, etc., have been used.
For example, as described in Patent Document 1 (JP 2005-351767 A), the present applicant has developed a magnetostrictive liquid level gauge which is equipped with a first float for detecting the oil level in a liquid storage tank and a second float for detecting the water level, and which calculates whether the fluctuation per unit time of the liquid level is equal to or greater than a predetermined amount, and which can accurately detect whether water has accumulated in the liquid storage tank based on the calculation result and the detection result of the water level (see in particular paragraphs 0008-0011, 0017 and Figure 1).
Furthermore, Patent Document 2 (JP 2016-156699 A) describes an anomaly detection method and an anomaly detection device for detecting an anomaly in a fuel storage system at a service station (SS) that supplies fuel to vehicles, which determines the possibility of fuel leakage or water contamination and the location of the leakage or water contamination based on the amount of fuel injected from a tanker truck (106) into a storage tank (102), the increase or decrease in the amount of fuel oil stored in the storage tank (102), and the amount of fuel dispensed from a weighing machine (104) to a vehicle, etc. (See especially paragraphs 0022, 0032-0044 and FIG. 1).
Furthermore, Patent Document 3 (JP 2013-43648 A) describes an inventory management system that records logbook data at a gas station equipped with an underground tank (20) for storing fuel oil, statistical analysis data obtained by statistically processing the logbook data, and liquid level fluctuation data when the fuel oil is stationary, and determines that there is a fuel oil leak in the underground tank and notifies the user when it detects that at least one of the logbook data, the statistical analysis data, and the liquid level fluctuation data when the fuel oil is stationary is abnormal (see especially the Abstract, paragraphs 0022, 0032-0055, and Figure 1).

しかし、液面検知装置は、地下貯蔵タンクの液相部のみの漏えい検知が可能なものであり、気相部や配管についての漏えいは検知することができず、在庫管理データ等の分析に基づいて判定する在庫管理システムは、地下貯蔵タンクと給油管、注油管からの漏えい検知が可能であるが、どこから漏れているかの部位を特定することができない。従来は、これらの装置やシステムが別々に運用されており、両者の連携が取れていなかった。
そして、特許文献１に記載されている発明は、液体貯蔵タンク内に水が溜まっているか否かを正確に検知するものであって、この発明で利用している磁歪式液面計を液体貯蔵タンクの漏えい等の検知に用いることに関しては何ら記載されていない。
また、特許文献２には、燃料の貯蔵システムにおける燃料の漏洩或いは水混入の可能性及びその発生箇所を判定する点が記載されているものの、油面計(108)は貯蔵タンク(102)内に貯蔵される燃料油の増減量を演算するために用いられているに過ぎない。
さらに、特許文献３は、記録帳データ、統計分析データ及び静止時の液面変動データの少なくとも一つが異常であることを検出したときに地下タンクに燃料油の漏洩があると判定し報知するが、それぞれの判定は独立しており、それらのデータを総合した判定は行われておらず、どの判定を優先して報知するかについても考慮されていない。 However, liquid level detection devices can only detect leaks from the liquid phase of underground storage tanks, and cannot detect leaks from the gas phase or piping, and inventory management systems that make decisions based on the analysis of inventory management data, etc., can detect leaks from underground storage tanks, fuel supply pipes, and oil filling pipes, but cannot identify the location of the leak. Conventionally, these devices and systems have been operated separately and there was no coordination between the two.
Furthermore, the invention described in Patent Document 1 accurately detects whether water has accumulated in a liquid storage tank, but there is no mention of using the magnetostrictive liquid level gauge utilized in this invention to detect leaks, etc. in liquid storage tanks.
In addition, although Patent Document 2 describes how to determine the possibility of fuel leakage or water contamination in a fuel storage system and the location of such leakage or water contamination, the oil level gauge (108) is only used to calculate the increase or decrease in the amount of fuel oil stored in the storage tank (102).
Furthermore, in Patent Document 3, when an abnormality is detected in at least one of the logbook data, statistical analysis data, and stationary liquid level fluctuation data, it is determined that there is a fuel oil leak in an underground tank and issues an alert, but each determination is independent and no overall determination of the data is made, nor is any consideration given to which determination should be given priority in alerting.

特開２００５－３５１７６７号公報（特許第４１４９９６３号公報）JP 2005-351767 A (Patent No. 4149963 A) 特開２０１６－１５６６９９号公報（特許第６４９７９７０号公報）JP 2016-156699 A (Patent No. 6497970 A) 特開２０１３－４３６４８号公報（特許第５６７３４３７号公報）JP 2013-43648 A (Patent No. 5673437 A)

本発明の課題は、液面検知装置と在庫管理データ等の分析に基づいて判定する在庫管理システムを連携させて運用し、お互いの欠点を補完して確実で速やかな漏えい検知と異常発生箇所の特定を実現することである。具体的には、液体貯蔵タンク内の液量、液体計量機から車両等への液体排出量及び液体貯蔵タンクへの液体注入量を特定期間以上分析することによって、液体貯蔵タンクや配管からの漏えい等を検知し、異常発生箇所を特定できるようにするとともに、精度の高い液面・水面センサー（例えば磁歪式液面・水面センサー）を用いて液体貯蔵タンク内の液面レベル及び水面レベルを検出し、特定期間以内に液体貯蔵タンクの液相部からの漏えいや液体貯蔵タンクへの水の混入を検知することが可能な液体在庫管理システムを提供することである。 The objective of the present invention is to operate a liquid level detection device in conjunction with an inventory management system that makes judgments based on the analysis of inventory management data, etc., to complement each other's shortcomings and realize reliable and rapid detection of leaks and identification of the location of an abnormality. Specifically, the objective is to provide a liquid inventory management system that can detect leaks from the liquid storage tank or piping and identify the location of an abnormality by analyzing the amount of liquid in the liquid storage tank, the amount of liquid discharged from the liquid measuring device to a vehicle, etc., and the amount of liquid injected into the liquid storage tank for a specific period of time or more, and that can detect the liquid level and water level in the liquid storage tank using a highly accurate liquid/water level sensor (e.g., a magnetostrictive liquid/water level sensor) and detect leaks from the liquid phase of the liquid storage tank or the intrusion of water into the liquid storage tank within a specific period of time.

上記の課題を解決するための請求項１に係る発明は、液体排出用配管及び液体注入用配管を有する液体貯蔵タンク内に貯蔵されている液体の漏えい又は前記液体貯蔵タンクへの水の混入を検知し、前記液体貯蔵タンクの状態を報知する液体在庫管理システムであって、
前記液体貯蔵タンクに設置され、所定時間毎に貯蔵されている液体の液面レベル及び前記液体貯蔵タンク底部に溜まっている水の水面レベルを検出し、前記液面レベルに対応する液量情報及び前記水面レベルに対応する水量情報を送信する液面・水面センサーと、
前記液体貯蔵タンクに注入される液体の量を計量し、注入中か否かを識別するとともに、注入開始から注入終了までの時刻及び液量を記録する注入量情報蓄積手段と、
前記液体貯蔵タンクから排出される液体の量を計量し、排出中か否かを識別するとともに、排出開始から排出終了までの時刻及び液量を記録する排出量情報蓄積手段と、
前記液体貯蔵タンク内の初期液量を計測した後、所定期間経過後における前記液体貯蔵タンク内の末期液量を計測し、前記初期液量と前記所定期間中に注入及び排出された液量とから計算残液量を求め、前記計算残液量と前記末期液量との差の絶対値である増減量を計算して、計測時刻及び増減量を記録する増減量情報蓄積手段と、
直近特定期間以内に前記液面・水面センサーから送信される液量情報及び水量情報に基づいて、前記液体貯蔵タンクからの液体の漏えい又は前記液体貯蔵タンクへの水の混入を検知し、迅速分析情報を送信する迅速分析手段と、
直近特定期間以上に亘って前記注入量情報蓄積手段に記録された注入開始から注入終了までの時刻及び液量、前記排出量情報蓄積手段に記録された排出開始から排出終了までの時刻及び液量並びに前記増減量情報蓄積手段に記録された計測時刻及び増減量に基づいて、前記液体貯蔵タンク、前記液体排出用配管及び前記液体注入用配管からの液体の漏えい又は前記液体貯蔵タンクへの水の混入を検知するとともに異常発生箇所を特定し、詳細分析情報を送信する詳細分析手段と、
前記迅速分析手段から送信される迅速分析情報及び前記詳細分析手段から送信される詳細分析情報を受信し、受信した迅速分析情報及び詳細分析情報に基づいて、液体貯蔵タンク状態情報を報知する液体貯蔵タンク状態報知手段を備えており、
前記液体貯蔵タンク状態報知手段は、
前記迅速分析手段及び前記詳細分析手段から迅速分析情報及び詳細分析情報を受信している場合には、詳細分析情報に基づいて液体貯蔵タンク状態情報を報知し、
前記詳細分析手段からは詳細分析情報を受信しておらず、前記迅速分析手段からのみ迅速分析情報を受信している場合には、迅速分析情報に基づいて液体貯蔵タンク状態情報を報知することを特徴としている。 The invention according to claim 1 for solving the above problem is a liquid inventory management system that detects leakage of liquid stored in a liquid storage tank having a liquid discharge pipe and a liquid injection pipe, or intrusion of water into the liquid storage tank, and notifies the state of the liquid storage tank,
a liquid level/water level sensor that is installed in the liquid storage tank and detects the liquid level of the stored liquid and the water level of the water accumulated in the bottom of the liquid storage tank at predetermined time intervals, and transmits liquid volume information corresponding to the liquid level and water volume information corresponding to the water level;
an injection amount information storage means for measuring the amount of liquid injected into the liquid storage tank, identifying whether injection is in progress or not, and recording the time and amount of liquid from the start to the end of injection;
a discharge information storage means for measuring the amount of liquid discharged from the liquid storage tank, determining whether or not the liquid is being discharged, and recording the time and the amount of liquid from the start to the end of the discharge;
an increase/decrease information storage means for measuring an initial liquid volume in the liquid storage tank, and then measuring a terminal liquid volume in the liquid storage tank after a predetermined period of time has elapsed, determining a calculated residual liquid volume from the initial liquid volume and the liquid volume injected and discharged during the predetermined period, calculating an increase/decrease amount which is the absolute value of the difference between the calculated residual liquid volume and the terminal liquid volume, and recording the measurement time and the increase/decrease amount;
a rapid analysis means for detecting leakage of liquid from the liquid storage tank or ingress of water into the liquid storage tank based on liquid volume information and water volume information transmitted from the liquid level/water level sensor within a recent specific period, and transmitting rapid analysis information;
a detailed analysis means for detecting leakage of liquid from the liquid storage tank, the liquid discharge pipe, and the liquid injection pipe, or intrusion of water into the liquid storage tank, based on the time and liquid volume from the start of injection to the end of injection recorded in the injection volume information storage means over the most recent specific period or more, the time and liquid volume from the start of discharge to the end of discharge recorded in the discharge amount information storage means, and the measurement time and increase/decrease amount recorded in the increase/decrease amount information storage means, and for identifying the location of the abnormality and transmitting detailed analysis information;
a liquid storage tank status notifying means for receiving rapid analysis information transmitted from the rapid analysis means and detailed analysis information transmitted from the detailed analysis means, and notifying liquid storage tank status information based on the received rapid analysis information and detailed analysis information ,
The liquid storage tank state notification means includes:
When the rapid analysis information and the detailed analysis information are received from the rapid analysis means and the detailed analysis means, the liquid storage tank status information is notified based on the detailed analysis information;
When detailed analysis information is not received from the detailed analysis means and rapid analysis information is received only from the rapid analysis means, liquid storage tank status information is notified based on the rapid analysis information .

上記の課題を解決するための請求項２に係る発明は、請求項１に係る発明の液体在庫管理システムにおいて、
前記迅速分析手段は、液体の排出及び注入の無い時間帯において前記液面・水面センサーから送信される安定時液量情報及び安定時水量情報に基づいて、前記液体貯蔵タンクからの液体の漏えい又は前記液体貯蔵タンクへの水の混入を検知し、
前記増減量情報蓄積手段は、液体の排出及び注入の無い時間帯における安定時末期液量を計測し、前記計算残液量と前記安定時末期液量との差の絶対値である増減量を計算することを特徴とする。 In order to solve the above problem, the present invention relates to a liquid inventory management system according to the first aspect of the present invention,
the rapid analysis means detects leakage of liquid from the liquid storage tank or ingress of water into the liquid storage tank based on stable liquid volume information and stable water volume information transmitted from the liquid level/water level sensor during a time period when no liquid is discharged or injected;
The increase/decrease information storage means is characterized in that it measures the stable end fluid volume during a time period when there is no discharge or injection of fluid, and calculates the increase/decrease amount which is the absolute value of the difference between the calculated residual fluid volume and the stable end fluid volume.

請求項１又は２に係る発明によれば、液面検知装置と在庫管理データ等の分析に基づいて判定する液体在庫管理システムを連携させて運用し、お互いの欠点を補完して確実で速やかな漏えい検知と漏えい個所の特定を実現することができる。
具体的には、液体貯蔵タンク内の液量及び水量を検出することで、特定期間以内（通常は１日以内）に液体貯蔵タンクの液相部からの漏えいや液体貯蔵タンクへの水の混入を検知することができ、さらに、液体貯蔵タンク内の液量、液体計量機からの液体排出量及び液体貯蔵タンクへの液体注入量を特定期間以上（通常は２日以上）分析することによって、液体貯蔵タンクや配管からの漏えい等を検知して異常発生箇所を特定できる。
また、詳細分析手段から詳細分析情報を受信していないときにおいても、迅速分析情報に基づいて液体貯蔵タンク状態情報を報知することができる。 According to the invention of claim 1 or 2, the liquid level detection device and a liquid inventory management system that makes judgments based on the analysis of inventory management data, etc., can be operated in conjunction with each other to complement each other's shortcomings, thereby enabling reliable and rapid leak detection and identification of the leak location.
Specifically, by detecting the amount of liquid and water in the liquid storage tank, it is possible to detect leakage from the liquid phase of the liquid storage tank or water intrusion into the liquid storage tank within a specific period of time (usually within one day). Furthermore, by analyzing the amount of liquid in the liquid storage tank, the amount of liquid discharged from the liquid metering device, and the amount of liquid injected into the liquid storage tank for a specific period of time or longer (usually two days or longer), it is possible to detect leakage from the liquid storage tank or piping, and pinpoint the location of the abnormality.
Furthermore, even when detailed analysis information has not been received from the detailed analysis means, the liquid storage tank status information can be notified based on the quick analysis information.

実施例１に係る石油在庫管理システムのブロック図。FIG. 1 is a block diagram of an oil inventory management system according to a first embodiment. 実施例１の迅速分析手段３４における処理手順のフローチャート。4 is a flowchart of a processing procedure in the rapid analysis means 34 of the first embodiment. 実施例１の注入量情報蓄積手段３１における処理手順のフローチャート。4 is a flowchart of a processing procedure in an injection amount information storage unit 31 according to the first embodiment. 実施例１の排出量情報蓄積手段３２における処理手順のフローチャート。5 is a flowchart of a processing procedure in a discharge amount information accumulation unit 32 according to the first embodiment. 実施例１の増減量情報蓄積手段３３における処理手順のフローチャート。11 is a flowchart of a processing procedure in an increase/decrease amount information accumulation unit 33 according to the first embodiment. 実施例１の詳細分析手段３５における処理手順のフローチャート。13 is a flowchart of a processing procedure in a detailed analysis means 35 according to the first embodiment. 実施例２の水位監視手段における処理手順のフローチャート。13 is a flowchart of a processing procedure in a water level monitoring means according to the second embodiment.

以下、実施例によって本発明の実施形態を説明する。 The following describes the embodiment of the present invention using examples.

図１は、実施例１に係る石油在庫管理システムのブロック図である。
図１に示すように、実施例１に係る石油在庫管理システムは次の構成を備えている。
（１）石油排出用配管１（「サクション配管」ともいう。）、石油注入用配管２及び通気用配管３を有する石油貯蔵タンク４。
そして、石油排出用配管１は点検用の分岐端部を閉鎖する蓋５を有しており、石油注入用配管２の端部には口金６が設けてあり、通気用配管３は点検用の分岐端部を閉鎖する蓋７を有するとともに、外部に延びる端部には通気口８が設けてある。 FIG. 1 is a block diagram of an oil inventory management system according to a first embodiment.
As shown in FIG. 1, the oil inventory management system according to the first embodiment has the following configuration.
(1) An oil storage tank 4 having an oil discharge pipe 1 (also called a "suction pipe"), an oil injection pipe 2, and a ventilation pipe 3.
The oil discharge pipe 1 has a cover 5 for closing the branched end for inspection, the oil injection pipe 2 has a nozzle 6 at its end, and the ventilation pipe 3 has a cover 7 for closing the branched end for inspection, and a ventilation port 8 is provided at the end extending to the outside.

（２）所定時間毎（例えば１秒毎）に貯蔵されている石油の液面レベル及び石油貯蔵タンク４の底部に溜まっている水の水面レベルを検出し、液面レベルに対応する液量情報及び水面レベルに対応する水量情報を送信する磁歪式液面・水面センサー９。
そして、磁歪式液面・水面センサー９は、石油貯蔵タンク４の上方に設置される検出部１０、検出部１０の下部から石油貯蔵タンク４の底部まで延びるリードパイプ１１（金属管）、検出部１０からリードパイプ１１の下端部まで延びる磁歪線１２、磁歪線１２の上端部に設けてある振動検出コイル１３、リードパイプ１１の外側を上下にスライド可能で磁石を内蔵している上部フロート１４及び下部フロート１５、検出した液面レベル及び水面レベルに対応する液量情報及び水量情報を送信するレベル情報送信部１６を有している。
なお、磁歪式液面・水面センサー９によれば、磁歪線１２に供給されるパルス電流と磁石による磁界との相互作用により磁歪線１２に発生するねじれ歪の超音波振動パルスの発生位置に応じて、パルス電流を供給してから振動検出コイル１３によって受信パルスが得られるまでの経過時間が変化するところ、上部フロート１４の比重を貯蔵されている石油より小さく、下部フロート１５の比重を貯蔵されている石油より大きく水より小さくすると、上部フロート１４及び下部フロート１５に内蔵されている磁石の高さは、それぞれ液面レベル及び水面レベルに応じた高さになるので、上記の経過時間を計測することによって正確な液面レベル及び水面レベルを計測することができ、液面レベル及び水面レベルに対応する液量情報及び水量情報を随時取得することができる。 (2) A magnetostrictive liquid level/water level sensor 9 that detects the liquid level of the stored oil and the water level of the water accumulated at the bottom of the oil storage tank 4 at predetermined time intervals (for example, every second) and transmits liquid volume information corresponding to the liquid level and water volume information corresponding to the water level.
The magnetostrictive liquid/water level sensor 9 includes a detection unit 10 installed above the oil storage tank 4, a lead pipe 11 (metal tube) extending from the lower part of the detection unit 10 to the bottom of the oil storage tank 4, a magnetostrictive wire 12 extending from the detection unit 10 to the lower end of the lead pipe 11, a vibration detection coil 13 provided at the upper end of the magnetostrictive wire 12, an upper float 14 and a lower float 15 which can slide up and down on the outside of the lead pipe 11 and have magnets built in, and a level information transmission unit 16 which transmits liquid volume information and water volume information corresponding to the detected liquid level and water level.
In addition, according to the magnetostrictive liquid/water level sensor 9, the elapsed time from when the pulse current is supplied to when a received pulse is obtained by the vibration detection coil 13 changes depending on the position of the ultrasonic vibration pulse of the torsional distortion generated in the magnetostrictive wire 12 due to the interaction between the pulse current supplied to the magnetostrictive wire 12 and the magnetic field generated by the magnet. If the specific gravity of the upper float 14 is made lower than that of the stored oil and the specific gravity of the lower float 15 is made higher than that of the stored oil but lower than that of water, the heights of the magnets built into the upper float 14 and lower float 15 will correspond to the liquid level and water level, respectively. Therefore, by measuring the above-mentioned elapsed time, the liquid level and water level can be accurately measured, and liquid volume information and water volume information corresponding to the liquid level and water level can be obtained at any time.

（３）石油貯蔵タンク４内に貯蔵されている石油を汲み上げて、車両や石油容器等へ石油を排出することができ、排出した石油の量を計量した上で排出終了後に石油排出量情報を送信する石油計量機１７。
そして、石油計量機１７の内部には石油排出用配管１の一端部に接続されるポンプ１８が設けられ、側面には給油ノズル１９に接続された給油ホース２０が引き出されており、給油時には給油ノズル１９から排出した石油の量を計量して前面に設けられている表示部２１に排出した石油量等を表示するとともに、給油が終了して給油ノズル１９をノズル掛け２２に戻すと石油排出量情報を送信するようになっている。
また、石油排出用配管１の他端部（石油貯蔵タンク４内）には、タンク内の石油を汲み上げる際に水等が混入しないようにするため、除水器２３が設けてある。 (3) An oil metering machine 17 that can pump up the oil stored in the oil storage tank 4 and discharge the oil into a vehicle, oil container, etc., measures the amount of oil discharged, and transmits information about the amount of oil discharged after discharge is completed.
A pump 18 connected to one end of the oil discharge pipe 1 is provided inside the oil metering device 17, and a fuel supply hose 20 connected to a fuel supply nozzle 19 is pulled out on the side.When refueling, the amount of oil discharged from the fuel supply nozzle 19 is measured and the amount of oil discharged is displayed on a display unit 21 provided on the front.When refueling is completed and the fuel supply nozzle 19 is returned to the nozzle hanger 22, information on the amount of oil discharged is transmitted.
A water remover 23 is provided at the other end of the oil discharge pipe 1 (inside the oil storage tank 4) to prevent water or the like from being mixed in when the oil in the tank is pumped up.

（４）石油排出用配管１の一部及び蓋５、通気用配管３の上部、蓋７及び通気口８並びに磁歪式液面・水面センサー９の上部（リードパイプ１１の上部、磁歪線１２の上部、振動検出コイル１３及びレベル情報送信部１６）を収容するマンホール２４。
そして、マンホール２４の開口部には着脱可能な鉄蓋２５が設けてある。
（５）石油積載用タンク２６、石油積載用タンク２６内の石油を石油貯蔵タンク４に注入するための石油注入用ホース２７を有するタンクローリー等の石油運搬車２８。
なお、石油注入用ホース２７の端部には接続具２９が設けてあり、接続具２９は石油注入用配管２端部の口金６に対して容易に脱着することができるので、石油積載用タンク２６から石油を漏らすことなく石油貯蔵タンク４に注入することができる。
（６）クレジットカード等を読み取るカードリーダ、データ入力用のキーボード、データ等を表示する表示装置、伝票等を印字するプリンター、これらを制御する制御装置等で構成され、石油計量機１７からの給油要求信号を受信して給油許可信号を出力した後、石油計量機１７から送信される石油排出量情報に基づいて清算処理や売上げ管理を行うとともに、磁歪式液面・水面センサー９のレベル情報送信部１６から送信される液量情報及び水量情報並びに石油運搬車２８の計量送信手段から送信される石油注入量情報を受信して、タンク残量や石油運搬車２８からの注入量等の管理を行うＰＯＳ端末３０。 (4) A manhole 24 that accommodates a part of the oil discharge pipe 1, the cover 5, the upper part of the ventilation pipe 3, the cover 7 and the ventilation port 8, and the upper part of the magnetostrictive liquid/water level sensor 9 (the upper part of the lead pipe 11, the upper part of the magnetostrictive wire 12, the vibration detection coil 13, and the level information transmission unit 16).
A removable iron cover 25 is provided on the opening of the manhole 24.
(5) An oil transport vehicle 28 such as a tank truck having an oil loading tank 26 and an oil injection hose 27 for injecting the oil in the oil loading tank 26 into the oil storage tank 4.
In addition, a connector 29 is provided at the end of the oil injection hose 27, and the connector 29 can be easily attached and detached to the nozzle 6 at the end of the oil injection pipe 2, so that oil can be injected from the oil loading tank 26 into the oil storage tank 4 without leaking.
(6) A POS terminal 30 which is composed of a card reader for reading credit cards, etc., a keyboard for inputting data, a display device for displaying data, etc., a printer for printing slips, etc., and a control device for controlling these, and which receives a refueling request signal from the oil metering device 17 and outputs a refueling permission signal, and then performs settlement processing and sales management based on the oil discharge amount information transmitted from the oil metering device 17, and receives liquid volume information and water volume information transmitted from the level information transmitting unit 16 of the magnetostrictive liquid/water level sensor 9 and oil injection amount information transmitted from the measurement transmitting means of the oil tanker 28, and manages the remaining tank amount and the injection amount from the oil tanker 28, etc.

（７）磁歪式液面・水面センサー９のレベル情報送信部１６から送信される液量情報及び水量情報に基づいて、注入中であるか否かを示す注入中フラグＦｉを作成し、石油貯蔵タンク４への石油の注入開始及び注入終了を判定し、注入メモリに注入開始時刻、注入開始時の液量、注入終了時刻及び注入終了時の液量を記録する注入量情報蓄積手段３１。
（８）石油計量機１７から送信される排出開始信号、排出終了信号及び排出量ＳＤに基づいて、排出中であるか否かを示す排出中フラグＦｄを作成し、排出開始時刻、排出終了時刻及び排出量ＳＤを記録する排出量情報蓄積手段３２。
（９）磁歪式液面・水面センサー９のレベル情報送信部１６から送信される液量情報及び水量情報に基づいて、石油貯蔵タンク４内の初期液量を計測した後、所定期間経過後における石油貯蔵タンク４内の末期液量を計測し、注入メモリに記録された注入開始時刻、注入開始時の液量、注入終了時刻及び注入終了時の液量並びに排出メモリに記録された排出開始時刻、排出終了時刻及び排出量ＳＤに基づいて、初期液量と所定期間中に注入及び排出された液量とから計算残液量を求め、計算残液量と末期液量との差の絶対値である増減量を計算し増減量メモリに計測時刻及び増減量を記録する増減量情報蓄積手段３３。 (7) An injection volume information storage means 31 which creates an injection in progress flag Fi indicating whether or not injection is in progress based on the liquid volume information and water volume information transmitted from the level information transmission unit 16 of the magnetostrictive liquid level/water level sensor 9, determines the start and end of injection of oil into the oil storage tank 4, and records in the injection memory the injection start time, the liquid volume at the start of injection, the injection end time, and the liquid volume at the end of injection.
(8) A discharge information accumulation means 32 which creates a discharge in progress flag Fd indicating whether or not discharge is in progress based on the discharge start signal, discharge end signal, and discharge amount SD transmitted from the oil metering device 17, and records the discharge start time, discharge end time, and discharge amount SD.
(9) An increase/decrease information storage means 33 which measures the initial liquid volume in the oil storage tank 4 based on the liquid volume information and water volume information transmitted from the level information transmission unit 16 of the magnetostrictive liquid level/water level sensor 9, and then measures the final liquid volume in the oil storage tank 4 after a predetermined period of time has passed, and calculates a calculated remaining liquid volume from the initial liquid volume and the liquid volume injected and discharged during a predetermined period based on the injection start time, liquid volume at the start of injection, injection end time and liquid volume at the end of injection recorded in the injection memory, and the discharge start time, discharge end time and discharge amount SD recorded in the discharge memory, calculates the increase/decrease volume, which is the absolute value of the difference between the calculated remaining liquid volume and the terminal liquid volume, and records the measurement time and the increase/decrease volume in the increase/decrease volume memory.

（１０）直近特定期間以内（例えば１２時間）において、情報取得間隔Ｔａ毎（例えば１０分毎）に受信した液量情報及び水量情報に基づいて、石油貯蔵タンク４からの石油の漏えい又は石油貯蔵タンク４への水の混入を検知し、石油の漏えいの有無及び水の混入の有無に関する迅速分析情報を送信する迅速分析手段３４。
（１１）直近特定期間以上（例えば１週間）に亘って注入量情報蓄積手段３１に記録された注入開始から注入終了までの時刻及び液量、排出量情報蓄積手段３２に記録された排出開始から排出終了までの時刻及び液量並びに増減量情報蓄積手段３３に記録された計測時刻及び増減量に基づいて、石油貯蔵タンク４、石油排出用配管１及び石油注入用配管２からの石油の漏えい又は石油貯蔵タンク４への水の混入を検知するとともに、異常発生箇所が石油貯蔵タンク４、石油排出用配管１及び石油注入用配管２のいずれであるか特定し、石油の漏えいの有無、水の混入の有無及び異常発生箇所に関する詳細分析情報を送信する詳細分析手段３５。なお、詳細分析手段３５は、ガソリンスタンド等から離れた分析センター等に設置されており、時刻、液量及び増減量等の情報は、適宜の通信回線（図１ではインターネット回線）を介して受信している。
（１２）迅速分析手段３４から送信される迅速分析情報及び詳細分析手段３５から送信される詳細分析情報を受信し、受信した迅速分析情報及び詳細分析情報に基づいて、石油貯蔵タンク状態情報を報知する石油貯蔵タンク状態報知手段３６。 (10) A rapid analysis means 34 that detects oil leakage from the oil storage tank 4 or water contamination into the oil storage tank 4 based on liquid volume information and water volume information received at information acquisition intervals Ta (e.g., every 10 minutes) within a recent specific period (e.g., 12 hours) and transmits rapid analysis information regarding whether or not there is an oil leakage and whether or not there is water contamination.
(11) A detailed analysis means 35 that detects oil leakage from the oil storage tank 4, the oil discharge pipe 1, and the oil injection pipe 2, or water mixing into the oil storage tank 4, based on the time and liquid volume from the start of injection to the end of injection recorded in the injection amount information storage means 31, the time and liquid volume from the start of discharge to the end of discharge recorded in the discharge amount information storage means 32, and the measurement time and the increase/decrease recorded in the increase/decrease amount information storage means 33 over the most recent specific period or more (for example, one week), and identifies whether the abnormality occurs in the oil storage tank 4, the oil discharge pipe 1, or the oil injection pipe 2, and transmits detailed analysis information regarding the presence or absence of oil leakage, the presence or absence of water mixing, and the abnormality occurrence location. The detailed analysis means 35 is installed in an analysis center or the like away from a gas station, and receives information such as the time, liquid volume, and increase/decrease amount via an appropriate communication line (Internet line in FIG. 1).
(12) An oil storage tank status notification means 36 that receives rapid analysis information transmitted from the rapid analysis means 34 and detailed analysis information transmitted from the detailed analysis means 35, and notifies oil storage tank status information based on the received rapid analysis information and detailed analysis information.

図２は、実施例１の迅速分析手段３４における処理手順のフローチャートである。
その処理は、以下の手順１～１１によって石油貯蔵タンク４内の液量及び水量に異常があるかないかを判定記録する。以下、各手順について説明する。 FIG. 2 is a flowchart of the processing procedure in the rapid analysis means 34 of the first embodiment.
The process involves determining and recording whether or not there is an abnormality in the amount of liquid and water in the oil storage tank 4 through the following steps 1 to 11. Each step will be described below.

（手順１）＜条件設定＞
情報取得間隔Ｔａ（分）：例えば１０分、大量で突発的に発生する石油の漏えい等を検知するための短期液量変動許容値ＬＶＳ（リットル／１０分）：例えば２リットル／１０分、微少な石油の漏えい等を検知するための長期液量変動許容値ＬＶＬ（リットル／時）：例えば０．３８リットル／時、微少な水の漏えい等を検知するための長期水量変動許容値ＷＶＬ（リットル／時）：例えば０．３８リットル／時及びタンク容量に応じて微少な石油又は水の漏えい等を検知するために必要な情報取得回数Ｊ（回）：例えば７回（７回目の情報取得は１回目の情報取得から１時間経過後となる）を設定し、手順２に進む。
（手順２）カウンタ値ｎをリセットし、初期値を１とした後、手順３に進む。
（手順３）＜Ｔａ経過毎の情報取得並びに注入中フラグ及び排出中フラグの取得＞
情報取得間隔Ｔａが経過する度に、ｎ回目の時刻情報Ｔｎ、液量ＬＶｎ及び水量ＷＶｎ並びに石油の注入中及び排出中にそれぞれＯＮとなる注入中フラグＦｉ及び排出中フラグＦｄを取得した後、手順４に進む。
なお、注入中フラグＦｉ及び排出中フラグＦｄは、主として詳細分析手段３５で利用される情報を蓄積するための注入量情報蓄積手段３１及び排出量情報蓄積手段３２において作成されるものであるが、その詳細については後述する。
（手順４）手順３で取得した注入中フラグＦｉ又は排出中フラグＦｄがＯＮとなっているか否かに応じて、石油が注入中でなく排出中でもないかを判定し、Ｙｅｓであれば手順５に進み、Ｎｏ（注入中又は排出中）であれば手順２に戻る。 (Step 1) <Condition setting>
Set the information acquisition interval Ta (minutes): for example, 10 minutes, short-term liquid volume fluctuation tolerance LVS (liters/10 minutes) for detecting large, sudden oil leaks, etc.: for example, 2 liters/10 minutes, long-term liquid volume fluctuation tolerance LVL (liters/hour) for detecting small oil leaks, etc.: for example, 0.38 liters/hour, long-term water volume fluctuation tolerance WVL (liters/hour) for detecting small water leaks, etc.: for example, 0.38 liters/hour, and the number of information acquisitions J (times) required to detect small oil or water leaks, etc. depending on the tank capacity: for example, 7 times (the seventh information acquisition will be one hour after the first information acquisition), and proceed to step 2.
(Step 2) The counter value n is reset to an initial value of 1, and then the process proceeds to step 3.
(Step 3) <Acquisition of information for each Ta lapse and acquisition of injection flag and discharge flag>
Each time the information acquisition interval Ta elapses, the nth time information Tn, liquid volume LVn, water volume WVn, and the injection flag Fi and discharge flag Fd, which are turned ON while oil is being injected and discharged, respectively, are acquired, and then step 4 is proceeded to.
The injection flag Fi and the discharge flag Fd are created in the injection amount information storage means 31 and the discharge amount information storage means 32, which are used to store information mainly used by the detailed analysis means 35, and details of which will be described later.
(Step 4) Depending on whether the injection flag Fi or the discharge flag Fd obtained in Step 3 is ON, it is determined whether the oil is being injected or discharged. If the answer is Yes, proceed to Step 5, and if the answer is No (injection or discharge), return to Step 2.

（手順５）短期液量変化量ＬＡＳｎを次の式１を演算して算出し、手順６に進む。
ＬＡＳｎ＝｜ＬＶｎ－ＬＶ_ｎ－１｜・・・・・（式１）
（手順６）短期液量変化量ＬＡＳｎが短期液量変動許容値ＬＶＳ以上であれば短期液量異常と判定して手順７に進み、短期液量変動許容値ＬＶＳ未満であれば短期液量正常と判定して手順７に進む。
（手順７）カウンタ値ｎがＪに達していれば手順８に進み、達していなければｎ＝ｎ＋１とした上で手順３に戻る。
（手順８）長期液量変化量ＬＡＬｎを次の式２を演算して算出し、長期水量変化量ＷＡＬｎを次の式３を演算して算出し、手順９に進む。
ＬＡＬｎ＝｜ＬＶｎ－ＬＶ_１｜・・・・・（式２）
ＷＡＬｎ＝｜ＷＶｎ－ＷＶ_１｜・・・・・（式３）
（手順９）長期液量変化量ＬＡＬｎが長期液量変動許容値ＬＶＬ以上であれば液量異常と判定して手順１０に進み、長期液量変動許容値ＬＶＬ未満であれば液量正常と判定して手順１０に進む。
（手順１０）長期水量変化量ＷＡＬｎが長期水量変動許容値ＷＶＬ以上であれば水量異常と判定して手順１１に進み、長期水量変動許容値ＷＶＬ未満であれば水量正常と判定して手順１１に進む。
（手順１１）短期液量変化量ＬＡＳｎ、長期液量変化量ＬＡＬｎ及び長期水量変化量ＷＡＬｎを、液量・水量メモリに記録して手順２に戻る。 (Step 5) Calculate the short-term fluid volume change LASn using the following formula 1, and then proceed to step 6.
LASn=|LVn-LVn _-1 |...(Formula 1)
(Step 6) If the short-term fluid volume change amount LASn is greater than or equal to the short-term fluid volume fluctuation tolerance LVS, it is determined that the short-term fluid volume is abnormal and proceed to Step 7; if it is less than the short-term fluid volume fluctuation tolerance LVS, it is determined that the short-term fluid volume is normal and proceed to Step 7.
(Step 7) If the counter value n reaches J, proceed to step 8; if not, set n=n+1 and return to step 3.
(Step 8) Calculate the long-term liquid volume change LALn using the following formula 2, and calculate the long-term water volume change WALn using the following formula 3, then proceed to step 9.
LALn=|LVn-LV ₁ |...(Formula 2)
WALn=|WVn−WV ₁ | (Formula 3)
(Step 9) If the long-term fluid volume change amount LALn is equal to or greater than the long-term fluid volume fluctuation allowable value LVL, it is determined that the fluid volume is abnormal and the process proceeds to step 10; if it is less than the long-term fluid volume fluctuation allowable value LVL, it is determined that the fluid volume is normal and the process proceeds to step 10.
(Step 10) If the long-term water volume change WALn is greater than or equal to the long-term water volume fluctuation tolerance WVL, the water volume is determined to be abnormal and the process proceeds to step 11. If the long-term water volume change WALn is less than the long-term water volume fluctuation tolerance WVL, the water volume is determined to be normal and the process proceeds to step 11.
(Step 11) The short-term liquid volume change LASn, the long-term liquid volume change LALn and the long-term water volume change WALn are recorded in the liquid volume/water volume memory, and the process returns to step 2.

図３は、実施例１の注入量情報蓄積手段３１における処理手順のフローチャートである。
その処理は、以下の手順Ｉ１～Ｉ１１によって石油貯蔵タンク４への石油の注入開始及び注入終了を判定し、注入開始時刻及び注入開始時の液量（注入前液量ＤＳ）並びに注入終了時刻及び注入終了時の液量（注入後液量ＤＥ）を記録する。以下、各手順について説明する。 FIG. 3 is a flowchart of a processing procedure in the injection amount information storage means 31 of the first embodiment.
The process determines the start and end of oil injection into the oil storage tank 4 by the following steps I1 to I11, and records the injection start time and the liquid volume at the start of injection (pre-injection liquid volume DS) and the injection end time and the liquid volume at the end of injection (post-injection liquid volume DE). Each step is explained below.

（手順Ｉ１）＜条件設定＞
情報取得間隔Ｔｂ（秒）：例えば１０秒、磁歪式液面・水面センサー９で計測した液量を１０秒間隔で確認し、タンクへの注入開始を判定するための注入開始判定値ＰＤＳ（リットル／１０秒）：例えば１００リットル／１０秒及びタンクへの注入終了を判定するための注入終了判定値ＰＤＥ（リットル／１０秒）：例えば５０リットル／１０秒を設定し、手順Ｉ２に進む。
（手順Ｉ２）カウンタ値ｎ及び注入中フラグＦｉをリセットし、ｎを１、ＦｉをＯＦＦとした後、手順Ｉ３に進む。
（手順Ｉ３）＜Ｔｂ経過毎の情報取得＞
情報取得間隔Ｔｂが経過する度に、ｎ回目の時刻情報Ｔｎ、ｎ回目の液量情報Ｐｎを取得する。
（手順Ｉ４）注入中フラグＦｉがＯＦＦかＯＮかに応じて、Ｆｉ＝ＯＦＦであれば手順Ｉ５に進み、Ｆｉ＝ＯＮであれば手順Ｉ９に進む。 (Step I1) <Condition setting>
An information acquisition interval Tb (seconds): for example, 10 seconds; the liquid volume measured by the magnetostrictive liquid/water level sensor 9 is checked at 10 second intervals; an injection start judgment value PDS (liters/10 seconds) for determining the start of injection into the tank: for example, 100 liters/10 seconds; and an injection end judgment value PDE (liters/10 seconds) for determining the end of injection into the tank: for example, 50 liters/10 seconds, are set, and then procedure I2 is proceeded to.
(Step I2) The counter value n and the injection flag Fi are reset, n is set to 1 and Fi is set to OFF, and then the process proceeds to Step I3.
(Step I3) <Acquisition of information every Tb>
Each time the information acquisition interval Tb elapses, the nth time information Tn and the nth liquid volume information Pn are acquired.
(Step I4) Depending on whether the injection flag Fi is OFF or ON, if Fi=OFF, proceed to step I5, and if Fi=ON, proceed to step I9.

（手順Ｉ５）ｎ回目の液量情報Ｐｎからｎ－１回目の液量情報Ｐ_ｎ－１を引いた値の絶対値が注入開始判定値ＰＤＳ以上か否か、すなわち｜Ｐｎ－Ｐ_ｎ－１｜≧ＰＤＳであるか否かを判定し、Ｎｏであれば手順Ｉ６に進んでｎ＝ｎ＋１とした上で手順Ｉ３に戻る。また、Ｙｅｓであれば手順Ｉ７に進んで注入中フラグＦｉをＯＮとした上で手順Ｉ８に進む。
（手順Ｉ８）手順Ｉ３で取得したｎ－１回目の時刻情報Ｔ_ｎ－１及び液量情報Ｐ_ｎ－１を、それぞれ注入開始時刻Ｔis及び注入前液量ＤＳとして注入メモリに記録し、手順Ｉ６に進んでｎ＝ｎ＋１とした上で手順Ｉ３に戻る。
（手順Ｉ９）ｎ回目の液量情報Ｐｎからｎ－１回目の液量情報Ｐ_ｎ－１を引いた値の絶対値が注入終了判定値ＰＤＥ以下か否か、すなわち｜Ｐｎ－Ｐ_ｎ－１｜≦ＰＤＥであるか否かを判定し、Ｎｏであれば手順Ｉ６に進んでｎ＝ｎ＋１とした上で手順Ｉ３に戻る。また、Ｙｅｓであれば手順Ｉ１０に進んで終了タイマーを起動し、タイムアップまで待機した後、手順Ｉ１１に進む。
（手順Ｉ１１）手順Ｉ３で取得したｎ回目の時刻情報Ｔｎ及び液量情報Ｐｎを、それぞれ注入終了時刻Ｔie及び注入後液量ＤＥとして注入メモリに記録し、手順Ｉ２に戻る。 (Step I5) Determine whether the absolute value of the nth fluid volume information Pn minus the n-1th fluid volume information _Pn-1 is equal to or greater than the injection start determination value PDS, i.e., whether |Pn-Pn _-1 |≧PDS, and if No, proceed to Step I6, where n=n+1 is set, and then return to Step I3, and if Yes, proceed to Step I7, where the injection in progress flag Fi is set to ON, and then proceed to Step I8.
(Step I8) The n-1th time information T _n-1 and liquid volume information P _n-1 obtained in step I3 are recorded in the injection memory as the injection start time Tis and pre-injection liquid volume DS, respectively, and then the process proceeds to step I6, where n = n + 1 is set, and the process returns to step I3.
(Step I9) Determine whether the absolute value of the nth fluid volume information Pn minus the n-1th fluid volume information _Pn-1 is equal to or less than the injection end determination value PDE, i.e., whether |Pn-Pn _-1 |≦PDE, and if No, proceed to Step I6, set n=n+1, and return to Step I3, or if Yes, proceed to Step I10, start the end timer, wait until the timer is up, and then proceed to Step I11.
(Step I11) The n-th time information Tn and the liquid volume information Pn obtained in step I3 are recorded in the injection memory as the injection end time Tie and the post-injection liquid volume DE, respectively, and the process returns to step I2.

図４は、実施例１の排出量情報蓄積手段３２における処理手順のフローチャートである。
その処理は、以下の手順Ｄ１～Ｄ１１によって石油貯蔵タンク４からの石油の排出開始及び排出終了を判定し、排出開始時刻Ｔds並びに排出終了時刻Ｔde及び排出量ＳＤを記録する。以下、各手順について説明する。 FIG. 4 is a flowchart of a processing procedure in the emission amount information accumulation means 32 according to the first embodiment.
The process determines the start and end of discharging oil from the oil storage tank 4 by the following steps D1 to D11, and records the discharge start time Tds, discharge end time Tde, and discharge amount SD. Each step will be described below.

（手順Ｄ１）＜条件設定＞
情報取得間隔Ｔｃ（秒）：例えば１秒を設定し、手順Ｄ２に進む。
（手順Ｄ２）カウンタ値ｎ及び排出中フラグＦｄをリセットし、ｎ＝１、排出中フラグＦｄをＯＦＦとした後、手順Ｄ３に進む。
（手順Ｄ３）＜Ｔｃ経過毎の情報取得＞
情報取得間隔Ｔｃが経過する度に、ｎ回目の時刻情報Ｔｎを取得し、手順Ｄ４に進む。
（手順Ｄ４）排出中フラグＦｄがＯＦＦかＯＮかに応じて、ＦｄがＯＦＦであれば手順Ｄ５に進み、ＦｄがＯＮであれば手順Ｄ９に進む。 (Step D1) <Condition setting>
Information acquisition interval Tc (seconds): Set to, for example, 1 second, and proceed to step D2.
(Step D2) The counter value n and the discharging flag Fd are reset to n=1 and the discharging flag Fd is set to OFF, and then the process proceeds to Step D3.
(Step D3) <Acquisition of information every time Tc elapses>
Each time the information acquisition interval Tc elapses, the nth time information Tn is acquired, and the process proceeds to step D4.
(Step D4) Depending on whether the discharge flag Fd is OFF or ON, if Fd is OFF, proceed to step D5, and if Fd is ON, proceed to step D9.

（手順Ｄ５）石油計量機１７から排出開始信号を受信しているか判定し、受信していなければ手順Ｄ６に進んでｎ＝ｎ＋１とした上で手順Ｄ３に戻る。また、受信していれば手順Ｄ７に進んで排出中フラグＦｄをＯＮとした上で手順Ｄ８に進む。
（手順Ｄ８）手順Ｄ３で取得したｎ回目の時刻情報Ｔｎを排出開始時刻Ｔdsとして排出メモリに記録し、手順Ｄ６に戻ってｎ＝ｎ＋１とした上で手順Ｄ３に戻る。
（手順Ｄ９）石油計量機１７から排出終了信号を受信しているか判定し、受信していなければ手順Ｄ６に戻ってｎ＝ｎ＋１とした上で手順Ｄ３に戻る。また、受信していれば手順Ｄ１０に進んで石油計量機１７から排出量ＳＤの情報を取得し、手順Ｄ１１に進む。
（手順Ｄ１１）手順Ｄ３で取得したｎ回目の時刻情報Ｔｎを排出終了時刻Ｔdeとし、手順Ｄ１０で取得した排出量ＳＤとともに排出メモリに記録して手順Ｄ２に戻る。 (Step D5) Determine whether a discharge start signal has been received from the oil metering device 17, and if not, proceed to step D6, set n=n+1, and return to step D3, or if received, proceed to step D7, set the discharge in progress flag Fd to ON, and then proceed to step D8.
(Step D8) The n-th time information Tn obtained in step D3 is recorded in the discharge memory as the discharge start time Tds, and the process returns to step D6, where n=n+1 is set, and the process returns to step D3.
(Step D9) Determine whether a discharge end signal has been received from the oil metering device 17, and if not, return to step D6, set n=n+1, and then return to step D3. If received, proceed to step D10 to obtain information on the discharge amount SD from the oil metering device 17, and then proceed to step D11.
(Step D11) The n-th time information Tn obtained in step D3 is set as the discharge end time Tde, and is recorded in the discharge memory together with the discharge amount SD obtained in step D10, and the process returns to step D2.

そして、注入量情報蓄積手段３１における処理の手順Ｉ８及び手順Ｉ１１において注入メモリに記録された注入開始時刻Ｔis、注入前液量ＤＳ、注入終了時刻Ｔie及び注入後液量ＤＥ並びに排出量情報蓄積手段における処理の手順Ｄ８及び手順Ｄ１１において排出メモリに記録された排出開始時刻Ｔds、排出終了時刻Ｔde及び排出量ＳＤに基づいて、注入開始時刻Ｔisから注入終了時刻Ｔieの間に排出された排出量ＳＤの総和である累積排出量ＳＡを算出し、注入時増減量ＤＶＡを次の式４を演算して算出し、注入メモリに注入開始時刻Ｔis、注入終了時刻Ｔie及び注入時増減量ＤＶＡを対応付けて記録する。
ＤＶＡ＝ＤＥ－ＤＳ＋ＳＡ・・・・・（式４） Then, based on the injection start time Tis, pre-injection fluid volume DS, injection end time Tie, and post-injection fluid volume DE recorded in the injection memory in processing steps I8 and I11 in the injection volume information storage means 31, and the discharge start time Tds, discharge end time Tde, and discharge amount SD recorded in the discharge memory in processing steps D8 and D11 in the discharge information storage means, a cumulative discharge amount SA, which is the sum of the discharge amount SD discharged between the injection start time Tis and the injection end time Tie, is calculated by calculating the following equation 4, and the injection start time Tis, injection end time Tie, and injection increase/decrease amount DVA are recorded in the injection memory in correspondence with each other.
DVA=DE-DS+SA...(Formula 4)

図５は、実施例１の増減量情報蓄積手段３３における処理手順のフローチャートである。
その処理は、以下の手順Ｚ１～Ｚ１１によって設定された情報取得間隔Ｔｄに到達する度に各種情報を取得し、計算残液量ＬＶＣと実液量ＬＶとの差の絶対値である増減量ＡＩＤを計算し、増減量メモリに情報取得時刻Ｔｅとともに増減量ＡＩＤを記録する。以下、各手順について説明する。 FIG. 5 is a flowchart of a processing procedure in the increase/decrease amount information accumulation unit 33 of the first embodiment.
In this process, various information is acquired each time the information acquisition interval Td set by the following steps Z1 to Z11 is reached, an increase or decrease amount AID, which is the absolute value of the difference between the calculated residual liquid volume LVC and the actual liquid volume LV, is calculated, and the increase or decrease amount AID is recorded in an increase or decrease amount memory together with the information acquisition time Te. Each step will be described below.

（手順Ｚ１）＜条件設定＞
情報取得間隔Ｔｄ（時間）：例えば４時間を設定し、手順Ｚ２に進む。
（手順Ｚ２）情報取得用タイマーをリセットし、手順Ｚ３に進む。
（手順Ｚ３）＜初期情報の取得＞
情報取得用タイマーをリセットした時点における初期時刻情報Ｔ０及び初期液量情報ＬＶ０を取得し、手順Ｚ４に進む。
（手順Ｚ４）情報取得用タイマーが情報取得間隔Ｔｄに到達したか判定し、到達していなければ手順Ｚ４を繰り返し、到達していれば手順Ｚ５に進む。
（手順Ｚ５）注入量情報蓄積手段３１及び排出量情報蓄積手段３２において作成される注入中フラグＦｉ及び排出中フラグＦｄを取得しているか否かに応じて、石油が注入中でなく排出中でもないかを判定し、Ｎｏ（注入中又は排出中）であれば手順Ｚ５を繰り返し、Ｙｅｓであれば手順Ｚ６に進む。 (Step Z1) <Condition setting>
Information acquisition interval Td (time): Set, for example, 4 hours, and proceed to step Z2.
(Step Z2) Reset the information acquisition timer and proceed to step Z3.
(Step Z3) <Acquisition of initial information>
The initial time information T0 and the initial liquid volume information LV0 at the time when the information acquisition timer is reset are acquired, and the process proceeds to step Z4.
(Step Z4) It is determined whether the information acquisition timer has reached the information acquisition interval Td. If it has not reached the interval, step Z4 is repeated; if it has reached the interval, the process proceeds to step Z5.
(Step Z5) Depending on whether or not the injection in progress flag Fi and the discharge in progress flag Fd created in the injection amount information accumulation means 31 and the discharge amount information accumulation means 32 have been acquired, it is determined whether the oil is neither being injected nor being discharged. If the answer is No (injecting or discharging), step Z5 is repeated; if the answer is Yes, proceed to step Z6.

（手順Ｚ６）＜各種情報の取得＞
情報取得用タイマーがタイムアップし、石油が注入中でなく排出中でもなくなった時点における末期時刻情報Ｔｅ及び末期液量情報ＬＶｅを取得する。また、注入メモリに記録された情報に基づいて情報取得間隔Ｔｄにおける石油の累積注入量ＤＶＣを算出するとともに、排出メモリに記録された情報に基づいて情報取得間隔Ｔｄにおける石油の累積排出量ＳＶＣを算出し、手順Ｚ７に進む。
（手順Ｚ７）＜計算残液量の算出＞
計算残液量ＬＶＣを次の式５を演算して算出し、手順Ｚ８に進む。
ＬＶＣ＝ＬＶ０＋ＤＶＣ－ＳＶＣ・・・・・（式５）
（手順Ｚ８）＜増減量の算出＞
増減量ＡＩＤを次の式６を演算して算出し、手順Ｚ９に進む。
ＡＩＤ＝｜ＬＶｅ－ＬＶＣ｜・・・・・・・（式６）
（手順Ｚ９）手順Ｚ３及び手順Ｚ６～Ｚ８で取得又は算出した初期時刻Ｔ０、末期時刻Ｔｅ、末期液量ＬＶｅ、累積注入量ＤＶＣ、累積排出量ＳＶＣ、計算残液量ＬＶＣ及び増減量ＡＩＤを増減量メモリに記録して手順Ｚ２に戻り、次期情報取得間隔の処理を行う。 (Step Z6) <Acquisition of various information>
The final time information Te and final liquid volume information LVe are obtained when the information acquisition timer times out and oil is neither being injected nor being discharged. The accumulated injected volume DVC of oil during the information acquisition interval Td is calculated based on the information recorded in the injection memory, and the accumulated discharge volume SVC of oil during the information acquisition interval Td is calculated based on the information recorded in the discharge memory, and then the process proceeds to step Z7.
(Step Z7) <Calculation of calculated residual liquid volume>
The calculated residual liquid volume LVC is calculated by calculating the following equation 5, and the process proceeds to step Z8.
LVC=LV0+DVC-SVC...(Formula 5)
(Step Z8) <Calculation of Increase/Decrease>
The increase or decrease AID is calculated by the following formula 6, and the process proceeds to step Z9.
AID=|LVe-LVC| (Formula 6)
(Step Z9) The initial time T0, final time Te, final liquid volume LVe, cumulative injection volume DVC, cumulative discharge volume SVC, calculated residual liquid volume LVC and increase/decrease amount AID obtained or calculated in steps Z3 and Z6 to Z8 are recorded in the increase/decrease amount memory, and then the process returns to step Z2 and processing for the next information acquisition interval is performed.

図６は、実施例１の詳細分析手段３５における処理手順のフローチャートである。
その処理は任意のタイミングでスタートし、以下の手順Ａ～Ｌによって、設定された分析間隔Ｒｐに到達した時点で、直近の分析データ日数ｄ日分の各種のデータを取得して各種増減量、液量及び水量に異常があるかないかを判定し、それらの判定結果に基づいて総合判定を行い、石油貯蔵タンク４や配管等における異常発生箇所を特定して処理を終了する。以下、各手順について説明する。 FIG. 6 is a flowchart of a processing procedure in the details analysis means 35 according to the first embodiment.
The process starts at any timing, and when the set analysis interval Rp is reached, various data for the most recent analysis data number d days is acquired, and it is judged whether there are any abnormalities in the various increases and decreases, liquid volumes, and water volumes, according to the following procedures A to L, and a comprehensive judgment is made based on the judgment results, and the location of the abnormality in the oil storage tank 4, piping, etc. is identified, and the process ends. Each procedure will be explained below.

（手順Ａ）＜条件設定＞
分析間隔Ｒｐ（時間）：例えば２４時間、分析データ日数ｄ（日）：例えば１０日、増減量許容値Ａｓ（％）：例えば、各増減量ＡＩＤの取得期間における累積排出量の１％、長期液量変化許容値Ｌｓ（リットル／時）：例えば、各増減量ＡＩＤの取得期間における平均値が０．３８リットル／時、長期水量変化許容値Ｗｓ（リットル／時）：例えば０．３８リットル／時及び注入時増減量許容値Ｄｓ（％）：例えば、各増減量ＡＩＤの取得期間における累積排出量の２％を設定し、手順Ｂに進む。
（手順Ｂ）データ取得用タイマーをリセットし、手順Ｃに進む。
（手順Ｃ）データ取得用タイマーが分析間隔Ｒｐに到達したか判定し、到達していなければ手順Ｃを繰り返し、到達していれば手順Ｄに進む。
（手順Ｄ）＜直近ｄ日間のデータ取得＞
増減量メモリから直近ｄ日間の増減量ＡＩＤと、各増減量ＡＩＤの取得期間における液量・水量メモリに記録されている長期液量変化量ＬＡＬｎ及び長期水量変化量ＷＡＬｎと、注入メモリに記録されている注入時増減量ＤＶＡと、排出メモリに記録されている排出開始時刻Ｔds、排出終了時刻Ｔde及び排出量ＳＤを取得し、手順Ｅに進む。 (Step A) <Condition setting>
Set the following: analysis interval Rp (hours): for example, 24 hours; number of days of analysis data d (days): for example, 10 days; allowable gain/loss As (%): for example, 1% of the cumulative discharge amount during the acquisition period of each gain/loss AID; long-term liquid volume change allowable Ls (liters/hour): for example, the average value during the acquisition period of each gain/loss AID is 0.38 liters/hour; long-term water volume change allowable Ws (liters/hour): for example, 0.38 liters/hour; and allowable injection gain/loss Ds (%): for example, 2% of the cumulative discharge amount during the acquisition period of each gain/loss AID, and proceed to step B.
(Step B) Reset the data acquisition timer and proceed to Step C.
(Procedure C) It is determined whether the data acquisition timer has reached the analysis interval Rp. If not, procedure C is repeated; if yes, procedure D is proceeded to.
(Step D) <Acquire data for the last d days>
The increase/decrease amount AID for the last d days is obtained from the increase/decrease amount memory, the long-term liquid volume change amount LALn and the long-term water volume change amount WALn recorded in the liquid volume/water volume memory during the acquisition period of each increase/decrease amount AID, the injection increase/decrease amount DVA recorded in the injection memory, and the discharge start time Tds, discharge end time Tde, and discharge amount SD recorded in the discharge memory, and then proceed to step E.

（手順Ｅ）各増減量ＡＩＤの取得期間における増減量ＡＩＤと、同期間における排出量ＳＤの総和との比率が、増減量許容値Ａｓ以上であれば増減量ＡＩＤに異常ありと判定して手順Ｆに進み、Ａｓ未満であれば増減量ＡＩＤに異常なしと判定して手順Ｆに進む。
（手順Ｆ）各増減量ＡＩＤの取得期間における長期液量変化量ＬＡＬｎの平均値が、長期液量変化許容値Ｌｓ以上であれば長期液量変化量ＬＡＬｎに異常ありと判定して手順Ｇに進み、Ｌｓ未満であれば長期液量変化量ＬＡＬｎに異常なしと判定して手順Ｇに進む。
（手順Ｇ）各増減量ＡＩＤの取得期間における長期水量変化量ＷＡＬｎの平均値が、長期水量変化許容値Ｗｓ以上であれば長期水量変化量ＷＡＬｎに異常ありと判定して手順Ｈに進み、Ｗｓ未満であれば長期水量変化量ＷＡＬｎに異常なしと判定して手順Ｈに進む。
（手順Ｈ）各増減量ＡＩＤの取得期間における注入時増減量ＤＶＡの平均値と、同期間における排出量ＳＤの総和との比率が、注入時増減量許容値Ｄｓ以上であれば注入時増減量ＤＶＡに異常ありと判定して手順Ｉに進み、Ｄｓ未満であれば注入時増減量ＤＶＡに異常なしと判定して手順Ｉに進む。 (Procedure E) If the ratio of the increase/decrease amount AID during the acquisition period of each increase/decrease amount AID to the sum of the discharge amount SD during the same period is equal to or greater than the increase/decrease amount allowable value As, it is determined that there is an abnormality in the increase/decrease amount AID and proceed to procedure F; if it is less than As, it is determined that there is no abnormality in the increase/decrease amount AID and proceed to procedure F.
(Step F) If the average value of the long-term liquid volume change amount LALn during the acquisition period of each increase/decrease amount AID is greater than or equal to the long-term liquid volume change tolerance Ls, it is determined that there is an abnormality in the long-term liquid volume change amount LALn and proceed to Step G; if it is less than Ls, it is determined that there is no abnormality in the long-term liquid volume change amount LALn and proceed to Step G.
(Procedure G) If the average value of the long-term water volume change amount WALn during the acquisition period of each increase/decrease amount AID is greater than or equal to the long-term water volume change tolerance Ws, it is determined that there is an abnormality in the long-term water volume change amount WALn and proceed to procedure H; if it is less than Ws, it is determined that there is no abnormality in the long-term water volume change amount WALn and proceed to procedure H.
(Procedure H) If the ratio of the average value of the injection loss amount DVA during the acquisition period of each loss amount AID to the sum of the discharge amount SD during the same period is equal to or greater than the injection loss amount allowable value Ds, it is determined that there is an abnormality in the injection loss amount DVA and proceed to procedure I; if it is less than Ds, it is determined that there is no abnormality in the injection loss amount DVA and proceed to procedure I.

（手順Ｉ）直近ｄ日間の全増減量ＡＩＤの取得期間について、手順Ｅ～Ｈの判定が終了したら、増減量ＡＩＤ、長期液量変化量ＬＡＬｎ、長期水量変化量ＷＡＬｎ及び注入時増減量ＤＶＡについての判定結果を判定結果メモリに記録して手順Ｊに進む。
（手順Ｊ）手順Ｉで判定結果メモリに記録された全判定結果に基づいて総合判定を行い、異常発生箇所として石油注入用配管２、石油貯蔵タンク４及び石油計量機１７等を特定して処理を終了する。
以下に、総合判定における判定例について説明する。
（判定例１）ＡＩＤ、ＬＡＬｎ及びＷＡＬｎは異常なし、ＤＶＡのみに異常がある場合は、石油注入用配管２の異常と判定する。
（判定例２）ＡＩＤ、ＬＡＬｎ及びＤＶＡは異常なし、ＷＡＬｎのみに異常がある場合は、石油貯蔵タンク４の異常と判定する。
（判定例３）ＬＡＬｎ、ＷＡＬｎ及びＤＶＡは異常なし、ＡＩＤのみに異常がある場合は、石油計量機１７の異常と判定する。 (Step I) When the judgments of steps E to H are completed for the acquisition period of the total gain/loss AID over the last d days, record the judgment results for the gain/loss AID, long-term liquid volume change LALn, long-term water volume change WALn, and injection gain/loss DVA in the judgment result memory and proceed to step J.
(Step J) A comprehensive judgment is made based on all the judgment results recorded in the judgment result memory in Step I, and the oil injection pipe 2, the oil storage tank 4, the oil metering machine 17, etc. are identified as the locations where abnormalities have occurred, and the process is terminated.
An example of the overall judgment will be described below.
(Determination Example 1) When no abnormality is found in AID, LALn, and WALn, and only an abnormality is found in DVA, it is determined that an abnormality exists in the oil injection pipe 2.
(Judgment Example 2) When no abnormality is found in AID, LALn, and DVA, and only an abnormality is found in WALn, it is judged that an abnormality exists in the oil storage tank 4.
(Judgment Example 3) When there is no abnormality in LALn, WALn, and DVA, and there is an abnormality only in AID, it is judged that there is an abnormality in the oil meter 17.

上記のとおり、実施例１の迅速分析手段３４は、手順３～６によって情報取得間隔Ｔａが経過する度に短期液量異常の有無を判定し、手順７～１０によってＪ回目の情報を取得する度に液量異常及び水量異常の有無を判定し、いずれかの異常有りと判定した時点及び処理を終了し液量・水量メモリに判定結果を記録した時点で石油貯蔵タンク状態報知手段３６に迅速分析情報を送信する。
また、実施例１の詳細分析手段３５は、手順Ｅ～Ｈに記載したとおり、各増減量ＡＩＤの取得期間における増減量ＡＩＤ、長期液量変化量ＬＡＬｎ、長期水量変化量ＷＡＬｎ及び注入時増減量ＤＶＡの異常有無を判定し、手順Ｉ及びＪに記載したとおり、全ての判定結果を判定結果メモリに記録するとともに、全判定結果に基づいて総合判定を行い、異常発生箇所として石油注入用配管２、石油貯蔵タンク４及び石油計量機１７等を特定して詳細分析情報が作成され、石油貯蔵タンク状態報知手段３６に迅速分析情報を送信する。
そして、迅速分析手段３４から送信される迅速分析情報及び詳細分析手段３５から送信される詳細分析情報を受信した石油貯蔵タンク状態報知手段３６は、迅速分析情報及び詳細分析情報の両方を受信している場合には、詳細分析情報に基づいて石油貯蔵タンク状態情報を報知し、迅速分析情報のみを受信している場合には、迅速分析情報に基づいて石油貯蔵タンク状態情報を報知する。報知の態様としては画面上に文字で表示するが、文字に加えて図で異常箇所を表示しても良いし、さらに音声による報知を加えても良い。 As described above, the rapid analysis means 34 of Example 1 determines whether or not there is a short-term liquid volume abnormality each time the information acquisition interval Ta has elapsed by steps 3 to 6, and determines whether or not there is a liquid volume abnormality and a water volume abnormality each time the Jth piece of information is acquired by steps 7 to 10, and transmits rapid analysis information to the oil storage tank status notification means 36 when it determines that there is any abnormality or when it ends the processing and records the determination result in the liquid volume/water volume memory.
In addition, as described in steps E to H, the detailed analysis means 35 of Example 1 judges whether there are any abnormalities in the increase/decrease amount AID, the long-term liquid volume change amount LALn, the long-term water volume change amount WALn, and the injection increase/decrease amount DVA during the acquisition period of each increase/decrease amount AID, and as described in steps I and J, records all the judgment results in a judgment result memory and makes a comprehensive judgment based on all the judgment results, identifies the oil injection piping 2, the oil storage tank 4, the oil metering device 17, etc. as the locations where abnormalities have occurred, creates detailed analysis information, and transmits the rapid analysis information to the oil storage tank status notification means 36.
The oil storage tank status notification means 36 receives the rapid analysis information transmitted from the rapid analysis means 34 and the detailed analysis information transmitted from the detailed analysis means 35, and when both the rapid analysis information and the detailed analysis information are received, notifies the oil storage tank status information based on the detailed analysis information, and when only the rapid analysis information is received, notifies the oil storage tank status information based on the rapid analysis information. The notification is displayed as characters on the screen, but the abnormality may be displayed in a diagram in addition to the characters, and may also be notified by voice.

実施例２は実施例１の全構成を有するとともに、水位監視手段を追加したものであり、図７は実施例２の水位監視手段における処理手順のフローチャートである。
その処理は、以下の手順Ｗ１～Ｗ６によって設定された情報取得間隔Ｔｃに到達する度に水位の情報等を取得し、水位異常有りと判定して液量・水量メモリに水位判定結果を記録した時点及び水位判定結果を記録し処理を終了した時点で、石油貯蔵タンク状態報知手段３６に水位異常有り又は無しの情報を送信する。以下、各手順について説明する。
そして、水位監視手段以外の構成は、実施例１と同じなので説明は省略する。 The second embodiment has all the configuration of the first embodiment, and further includes a water level monitoring means. FIG. 7 is a flow chart of the processing procedure of the water level monitoring means of the second embodiment.
This process acquires information on the water level and the like each time the information acquisition interval Tc set by the following steps W1 to W6 is reached, and when it is determined that there is an abnormality in the water level and the water level determination result is recorded in the liquid volume/water volume memory, and when the water level determination result is recorded and the process is terminated, information on whether there is an abnormality in the water level or not is transmitted to the oil storage tank state notification means 36. Each step is explained below.
The configuration other than the water level monitoring means is the same as in the first embodiment, so a description thereof will be omitted.

（手順Ｗ１）＜条件設定＞
情報取得間隔Ｔｃ（秒）：例えば１秒、石油貯蔵タンク４内における水分の蓄積による水位の上昇を検知するための水位異常判定値ＷＬｓ（ｍｍ）：例えば３５ｍｍを設定し、手順Ｗ２に進む。
（手順Ｗ２）＜Ｔｃ経過毎の情報取得＞
情報取得間隔Ｔｃが経過する度に、水位ＷＬ、注入中フラグＦｉ及び排出中フラグＦｄを取得した後、手順Ｗ３に進む。
（手順Ｗ３）手順２で取得した注入中フラグＦｉ又は排出中フラグＦｄがＯＮとなっているか否かに応じて、石油が注入中でなく排出中でもないかを判定し、Ｙｅｓであれば手順Ｗ４に進み、Ｎｏ（注入中又は排出中）であれば手順Ｗ２に戻る。 (Step W1) <Condition setting>
Set the information acquisition interval Tc (seconds): for example, 1 second, and the water level abnormality determination value WLs (mm): for example, 35 mm for detecting a rise in the water level due to accumulation of moisture in the oil storage tank 4, and proceed to step W2.
(Step W2) <Acquisition of information every time Tc elapses>
Each time the information acquisition interval Tc elapses, the water level WL, the in-pouring flag Fi, and the in-discharging flag Fd are acquired, and then the process proceeds to step W3.
(Step W3) Depending on whether the injection flag Fi or the discharge flag Fd obtained in Step 2 is ON, it is determined whether the oil is being injected or discharged. If the answer is Yes, proceed to Step W4, and if the answer is No (injection or discharge), return to Step W2.

（手順Ｗ４）水位ＷＬが水位異常判定値ＷＬｓ以上であれば水位異常と判定して手順Ｗ５に進み、ＷＬｓ未満であれば水位正常と判定して手順Ｗ５に進む。
（手順Ｗ５）手順Ｗ４で水位異常有りと判定した場合には、液量・水量メモリに水位異常有りという判定結果を記録するとともに石油貯蔵タンク状態報知手段３６に水位異常有りの情報を送信した後、手順Ｗ２に戻る。また、手順Ｗ４で水位正常と判定した場合には、液量・水量メモリに水位正常という判定結果を記録するとともに石油貯蔵タンク状態報知手段３６に水位正常の情報を送信した後、手順Ｗ２に戻る。
そして、水位監視手段から水位異常有りの情報を受信した石油貯蔵タンク状態報知手段３６は、直ちに石油貯蔵タンク４内における水位が上昇していることを報知する。
そのため、実施例２に係る石油在庫管理システムによれば、長期水量変動許容値ＷＶＬを下回る量で、石油貯蔵タンク４内に徐々に蓄積する水分による水位の上昇を常時検知するので、ガソリンスタンド等のスタッフに対して、そのような水位の上昇による石油貯蔵タンク４内の水位異常を迅速に報知することができる。 (Step W4) If the water level WL is equal to or greater than the water level abnormality determination value WLs, it is determined that the water level is abnormal and the process proceeds to step W5. If the water level WL is less than WLs, it is determined that the water level is normal and the process proceeds to step W5.
(Step W5) If it is determined in step W4 that there is an abnormality in the water level, the determination result that there is an abnormality in the water level is recorded in the liquid/water volume memory, and information that there is an abnormality in the water level is transmitted to the oil storage tank state notification means 36, and then the process returns to step W2. Also, if it is determined in step W4 that the water level is normal, the determination result that the water level is normal is recorded in the liquid/water volume memory, and information that the water level is normal is transmitted to the oil storage tank state notification means 36, and then the process returns to step W2.
Then, the oil storage tank state notification means 36, which receives information indicating an abnormality in the water level from the water level monitoring means, immediately notifies that the water level in the oil storage tank 4 is rising.
Therefore, according to the oil inventory management system of Example 2, the water level rise due to the gradual accumulation of moisture in the oil storage tank 4 is constantly detected at an amount below the long-term water volume fluctuation allowable value WVL, so that staff at gas stations, etc., can be quickly notified of abnormalities in the water level in the oil storage tank 4 due to such a rise in the water level.

実施例１及び２に係る石油在庫管理システムに関する変形例を列記する。
（変形例１）実施例１及び２は、石油在庫管理システムであったが、石油に限らず化学工場等で利用される溶剤等の在庫管理システムとしても良い。そのため、名称は液体在庫管理システムとし、特許請求の範囲では各構成の「石油」を「液体」に変更してある。
（変形例２）実施例１及び２においては、石油貯蔵タンク４は通気用配管３を有していたが、通気用配管３に代えて石油貯蔵タンク４の上面に通気用穴を設けても良い。
（変形例３）実施例１及び２においては、磁歪式液面・水面センサー９を用いたが、精度の高い液面・水面センサーであれば磁歪式液面・水面センサーでなくても良い。
（変形例４）実施例１及び２においては、ガソリンスタンド等に迅速分析手段３４及び石油貯蔵タンク状態報知手段３６が設置され、ガソリンスタンド等から離れた分析センター等に詳細分析手段３５が設置されていたが、迅速分析手段３４、詳細分析手段３５及び石油貯蔵タンク状態報知手段３６を、全てガソリンスタンド等に設置して一体型としても良く、迅速分析手段３４及び詳細分析手段３５を分析センター等に設置し、石油貯蔵タンク状態報知手段３６をガソリンスタンド等に設置しても良い。 Modifications of the oil inventory management system according to the first and second embodiments will be listed below.
(Modification 1) In the first and second embodiments, the system was an oil inventory management system, but it may be an inventory management system for solvents used in chemical plants, etc., not limited to oil. Therefore, the system is named a liquid inventory management system, and in the claims, "oil" in each component is changed to "liquid."
(Modification 2) In the first and second embodiments, the oil storage tank 4 has the ventilation pipe 3, but instead of the ventilation pipe 3, a ventilation hole may be provided on the top surface of the oil storage tank 4.
(Modification 3) In the first and second embodiments, the magnetostrictive liquid/water level sensor 9 is used, but any liquid/water level sensor with high accuracy is not required to be a magnetostrictive liquid/water level sensor.
(Variation 4) In the first and second embodiments, the rapid analysis means 34 and the oil storage tank status notification means 36 are installed at a gas station or the like, and the detailed analysis means 35 is installed at an analysis center or the like away from the gas station or the like. However, the rapid analysis means 34, the detailed analysis means 35 and the oil storage tank status notification means 36 may all be installed at a gas station or the like as an integrated unit, or the rapid analysis means 34 and the detailed analysis means 35 may be installed at an analysis center or the like, and the oil storage tank status notification means 36 may be installed at a gas station or the like.

（変形例５）実施例１及び２の注入量情報蓄積手段３１においては、手順Ｉ５及びＩ７で｜Ｐｎ－Ｐ_ｎ－１｜≧ＰＤＳであれば注入中フラグＦｉをＯＮとし、手順Ｉ９～Ｉ１１及びＩ２で｜Ｐｎ－Ｐ_ｎ－１｜≦ＰＤＥであれば注入中フラグＦｉをＯＦＦとしたが、石油運搬車２７から注入開始信号を送信し、同信号を受信していれば注入中フラグＦｉをＯＮとし、受信していなければ注入中フラグＦｉをＯＦＦとしても良い。
（変形例６）実施例１及び２の注入量情報蓄積手段３１においては、手順Ｉ８で注入前液量ＤＳを注入メモリに記録し、手順Ｉ１１で注入後液量ＤＥを注入メモリに記録したが、石油運搬車２７から注入量を送信し、注入前液量ＤＳ及び注入後液量ＤＥに代えて、送信された注入量を注入メモリに記録しても良い。 (Variant 5) In the injection amount information storage means 31 of Examples 1 and 2, if |Pn-P _n-1 |≧PDS in steps I5 and I7, the injection in progress flag Fi is turned ON, and if |Pn-P _n-1 |≦PDE in steps I9 to I11 and I2, the injection in progress flag Fi is turned OFF. However, it is also possible to transmit an injection start signal from the oil tanker 27, and if the signal is received, the injection in progress flag Fi is turned ON, and if the signal is not received, the injection in progress flag Fi is turned OFF.
(Variant 6) In the injection amount information storage means 31 of Examples 1 and 2, the pre-injection liquid amount DS is recorded in the injection memory in step I8, and the post-injection liquid amount DE is recorded in the injection memory in step I11. However, the injection amount may be transmitted from the oil tanker 27, and the transmitted injection amount may be recorded in the injection memory instead of the pre-injection liquid amount DS and the post-injection liquid amount DE.

（変形例７）実施例１及び２の排出量情報蓄積手段３２においては、手順Ｄ５及びＤ７で石油計量機１７から排出開始信号を受信しているか判定し、受信していれば手順Ｄ７に進んで排出中フラグＦｄをＯＮとし、手順Ｄ８で排出開始時刻Ｔdsを排出メモリに記録し、手順Ｄ９～Ｄ１１及びＤ２で石油計量機１７から排出終了信号を受信しているか判定し、同信号を受信していれば排出終了時刻Ｔdeとともに排出量ＳＤを排出メモリに記録し、排出中フラグＦｄをＯＦＦとしたが、手順Ｄ１で排出開始判定値ＳＤＳと排出終了判定値ＳＤＥを設定し、手順Ｄ３でｎ回目の時刻情報Ｔｎを取得するとともに、ｎ回目の液量情報Ｐｎを取得し、手順Ｄ５で｜Ｐｎ－Ｐ_ｎ－１｜≧ＳＤＳであるか否かを判定し、Ｙｅｓであれば手順Ｄ７に進んで排出中フラグＦｉをＯＮとし、手順Ｄ８で排出開始時刻Ｔdsとともに排出開始前液量を排出メモリに記録し、手順Ｄ９で｜Ｐｎ－Ｐ_ｎ－１｜≦ＳＤＥであれば手順Ｄ１１で排出終了時刻Ｔdeとともに排出後液量を排出メモリに記録し、手順Ｄ２で排出中フラグＦｄをＯＦＦとしても良い。 (Variation 7) In the discharge amount information accumulation means 32 of the first and second embodiments, in steps D5 and D7, it is determined whether a discharge start signal has been received from the oil metering machine 17, and if so, proceeds to step D7 to turn on the discharge in progress flag Fd, and in step D8, the discharge start time Tds is recorded in the discharge memory, and in steps D9 to D11 and D2, it is determined whether a discharge end signal has been received from the oil metering machine 17, and if so, the discharge amount SD is recorded in the discharge memory together with the discharge end time Tde, and the discharge in progress flag Fd is turned off. In step D1, a discharge start determination value SDS and a discharge end determination value SDE are set, in step D3, the n-th time information Tn is obtained, and the n-th liquid volume information Pn is obtained, and in step D5, |Pn-P _n-1 It is determined whether |Pn-P n-1 |≦SDS, and if the answer is Yes, proceed to step D7 to turn on the in-discharge flag Fi, and in step D8 to record the amount of liquid before the start of discharge together with the discharge start time Tds in the discharge memory, and in step D9, if |Pn-P _n-1 |≦SDE, in step D11 to record the amount of liquid after discharge together with the discharge end time Tde in the discharge memory, and in step D2, the in-discharge flag Fd is turned off.

（変形例８）実施例１及び２の詳細分析手段３５は、判定結果メモリに記録された全判定結果に基づいて総合判定を行い、異常発生箇所として石油注入用配管２、石油貯蔵タンク４及び石油計量機１７等を特定したが、石油注入系統、石油貯蔵タンク及び石油排出系統のいずれが異常発生箇所かを報知しても良い。また、逆に複数ある石油計量機別に排出量を計測したり、配車される石油運搬車別に注入量を計測したりして、どの石油計量機や石油運搬車が原因かを特定しても良い。 (Variation 8) The detailed analysis means 35 in Examples 1 and 2 performs a comprehensive judgment based on all judgment results recorded in the judgment result memory, and identifies the oil injection pipe 2, the oil storage tank 4, the oil metering device 17, etc. as the location where the abnormality occurred, but it may also notify which of the oil injection system, the oil storage tank, or the oil discharge system is the location where the abnormality occurred. Conversely, it may also be possible to measure the discharge amount for each of the multiple oil metering devices, or measure the injection amount for each dispatched oil tank, and identify which oil metering device or oil tank is the cause.

１石油排出用配管２石油注入用配管３通気用配管
４石油貯蔵タンク５蓋６口金７蓋
８通気口９磁歪式液面・水面センサー１０検出部
１１リードパイプ１２磁歪線１３振動検出コイル
１４上部フロート１５下部フロート１６レベル情報送信部
１７石油計量機１８ポンプ１９給油ノズル
２０給油ホース２１表示部２２ノズル掛け２３除水器
２４マンホール２５鉄蓋２６石油積載用タンク
２７石油注入用ホース２８石油運搬車２９接続具
３０ＰＯＳ端末３１注入量情報蓄積手段３２排出量情報蓄積手段
３３増減量情報蓄積手段３４迅速分析手段
３５詳細分析手段３６石油貯蔵タンク状態報知手段 LIST OF SYMBOLS 1 Oil discharge pipe 2 Oil injection pipe 3 Ventilation pipe 4 Oil storage tank 5 Lid 6 Cap 7 Lid 8 Vent 9 Magnetostrictive liquid/water level sensor 10 Detection unit 11 Lead pipe 12 Magnetostrictive wire 13 Vibration detection coil 14 Upper float 15 Lower float 16 Level information transmission unit 17 Oil metering device 18 Pump 19 Oil supply nozzle 20 Oil supply hose 21 Display unit 22 Nozzle hanger 23 Water remover 24 Manhole 25 Iron cover 26 Oil loading tank 27 Oil injection hose 28 Oil transport vehicle 29 Connector 30 POS terminal 31 Injection amount information storage means 32 Discharge amount information storage means 33 Increase/decrease amount information storage means 34 Rapid analysis means 35 Detailed analysis means 36 Oil storage tank status notification means

Claims

A liquid inventory management system that detects leakage of a liquid stored in a liquid storage tank having a liquid discharge pipe and a liquid injection pipe, or intrusion of water into the liquid storage tank, and reports a state of the liquid storage tank, comprising:
a liquid level/water level sensor that is installed in the liquid storage tank and detects the liquid level of the stored liquid and the water level of the water accumulated in the bottom of the liquid storage tank at predetermined time intervals, and transmits liquid volume information corresponding to the liquid level and water volume information corresponding to the water level;
an injection amount information storage means for measuring the amount of liquid injected into the liquid storage tank, identifying whether injection is in progress or not, and recording the time and amount of liquid from the start to the end of injection;
a discharge information storage means for measuring the amount of liquid discharged from the liquid storage tank, determining whether or not the liquid is being discharged, and recording the time and the amount of liquid from the start to the end of the discharge;
an increase/decrease information storage means for measuring an initial liquid volume in the liquid storage tank, and then measuring a terminal liquid volume in the liquid storage tank after a predetermined period of time has elapsed, determining a calculated residual liquid volume from the initial liquid volume and the liquid volume injected and discharged during the predetermined period, calculating an increase/decrease amount which is the absolute value of the difference between the calculated residual liquid volume and the terminal liquid volume, and recording the measurement time and the increase/decrease amount;
a rapid analysis means for detecting leakage of liquid from the liquid storage tank or ingress of water into the liquid storage tank based on liquid volume information and water volume information transmitted from the liquid level/water level sensor within a recent specific period, and transmitting rapid analysis information;
a detailed analysis means for detecting leakage of liquid from the liquid storage tank, the liquid discharge pipe, and the liquid injection pipe, or intrusion of water into the liquid storage tank, based on the time and liquid volume from the start of injection to the end of injection recorded in the injection volume information storage means over the most recent specific period or more, the time and liquid volume from the start of discharge to the end of discharge recorded in the discharge amount information storage means, and the measurement time and increase/decrease amount recorded in the increase/decrease amount information storage means, and for identifying the location of the abnormality and transmitting detailed analysis information;
a liquid storage tank status notifying means for receiving rapid analysis information transmitted from the rapid analysis means and detailed analysis information transmitted from the detailed analysis means, and notifying liquid storage tank status information based on the received rapid analysis information and detailed analysis information ,
The liquid storage tank state notification means includes:
When the rapid analysis information and the detailed analysis information are received from the rapid analysis means and the detailed analysis means, the liquid storage tank status information is notified based on the detailed analysis information;
When detailed analysis information is not received from the detailed analysis means and rapid analysis information is received only from the rapid analysis means, liquid storage tank status information is notified based on the rapid analysis information.
A liquid inventory management system comprising:

the rapid analysis means detects leakage of liquid from the liquid storage tank or ingress of water into the liquid storage tank based on stable liquid volume information and stable water volume information transmitted from the liquid level/water level sensor during a time period when no liquid is discharged or injected;
The liquid inventory management system according to claim 1, characterized in that the increase/decrease amount information storage means measures the stable end liquid volume during a time period when there is no discharge or injection of liquid, and calculates the increase/decrease amount which is the absolute value of the difference between the calculated remaining liquid volume and the stable end liquid volume.