JPH03111300A - Oil depot system - Google Patents

Abstract

PURPOSE:To improve the safety by a method wherein when the present residual amount of oil in a tank is compared with the residual amount at the time when all the metering equipments are on standby, and when the comparison result is out of a tolerable range for more than monitoring period, pumps of all the metering equipment corresponding to the tank are locked and prohibition of oil filling is noticed. CONSTITUTION:A leakage control table 21 consists of a standby period oil leakage amount area A12 where the oil leakage amount during standby period of all metering equipments corresponding to an underground tank is stored, a leakage monitoring period area A13 where oil leakage monitoring period is stored, and a tank maximum area where the tank maximum value corresponding to the total number of underground tanks provided is stored. When the oil leakage amount during standby period stored in the area A12 increases or decreased after the oil leakage monitoring time has elapsed since all the metering equipment corresponding to the underground tank are on standby, a common controller 15 notices the prohibition of oil filling through voice generating devices 12, 18, and 20. And, a data transmitter 18 makes an automatic call to transmit the voice of the prohibition of oil filling to set places. Thereby, the safety is improved.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a gas station system installed at a gas station, and particularly to a gas station system suitable for improving disaster prevention by accurately detecting and notifying leakage of oil from an underground tank.

[Conventional technology]

Generally, at gas stations, oil may leak from underground tanks due to aging or other causes, but when such oil leaks occur, they are extremely dangerous and may lead to explosions, etc. Failures may occur, such as damage or environmental pollution. For this reason, not only regular gas stations, but also gas stations installed on the first floor of high-rise buildings due to the deregulation of the Fire Service Act, can prevent accidents and environmental pollution caused by oil leaks as described above. There is a need to prevent this, and the establishment of an oil leak detection system at gas stations is required from the perspective of the Fire Service Act.

[Problem to be solved by the invention]

By the way, some oil service stations that supply oil from one underground tank to one measuring machine have a one-to-one correspondence between the underground tank and the measuring machine. There is a fueling station that compares the amount of oil lost in the tank measured by the method with the amount of oil supplied by a measuring machine, and detects the presence or absence of oil leakage from the underground tank based on the comparison result. However, in a filling station where oil is supplied from one underground tank to multiple measuring machines, where the underground tanks and measuring machines correspond in a one-to-many ratio, the measurement results from the liquid level gauge and the multiple There was a problem in that no system had been developed to detect oil leakage from underground tanks based on the amount of oil supplied using a measuring machine. The present invention solves the above-mentioned problems, and aims to provide a fueling station system that achieves improved disaster prevention by accurately detecting and notifying the leakage of oil from an underground tank.

[Means to solve the problem]

The invention according to claim 1 provides a fueling station configured to supply oil from a tank storing oil to a plurality of measuring machines,
residual oil amount measuring means for measuring the amount of residual oil in the tank; current residual oil amount storage means for storing the current amount of residual oil in the tank at the current point in time measured by the residual oil amount measuring means; and the residual oil amount measuring means. total measuring machine standby remaining oil amount storage means for storing the remaining oil amount in the tank when the total measuring machine is on standby and oil liquid is supplied from the tank; and a notification means for notifying that refueling is prohibited. and compares the current remaining oil amount in the tank stored in the current remaining oil amount storage means and the remaining oil amount in the tank when all measuring machines are on standby, which is stored in the all measuring machine standby remaining oil amount storage means. If the comparison result deviates from the allowable range after a preset monitoring time has elapsed, it is determined that there is an oil leak or rainwater intrusion in the tank, and all measuring machines that supply oil from the tank are locked. The invention as claimed in claim 2 is characterized in that the invention further comprises a control means for activating the notification means to notify that refueling is prohibited. At a gas station configured in
a residual oil amount measuring means for measuring the amount of remaining oil in the tank; a full oil amount storage means for storing the amount of full oil in the tank measured by the residual oil amount measuring means and at the time of completion of lubrication; and the remaining oil amount A current remaining oil amount storage means that stores the current remaining oil amount in the tank as measured by the measuring means, and a refueling device that stores the cumulative amount of refueling that is the sum of the refueling amounts by all the measuring machines that supply oil from the tank. an integrated amount storage means, a notification means for notifying the effect that refueling is prohibited, and a current remaining oil amount in the tank stored in the current remaining oil amount storage means based on the amount of full tank oil stored in the full oil amount storage device; When the amount of oil obtained by subtracting the amount of oil is compared with the cumulative amount of oil supplied from all measuring machines to which oil is supplied from the tank, which is stored in the cumulative amount storage means, and the comparison result deviates from the allowable range. The control means determines that there is an oil leak or rainwater intrusion in the tank, locks the pumps of all measuring machines to which oil is supplied from the tank, and operates the notification means to notify that refueling is prohibited. It is characterized by

[Effect]

According to the invention of claim 1, if the comparison result between the current remaining oil amount in the tank and the remaining oil amount when all measuring machines are on standby in the tank deviates from the allowable range after the monitoring time has elapsed, the tank According to the invention of claim 2, characterized in that all corresponding measuring machines are pump-locked and refueling is prohibited, the oil amount obtained by subtracting the current remaining oil amount in the tank from the full oil amount in the tank, and the oil amount in the corresponding tank. When the comparison result with the cumulative amount of refueling of all the measuring machines deviates from the allowable range, all the measuring machines corresponding to the tank are pump-locked and a notification to the effect that refueling is prohibited is issued.

【Example】

Hereinafter, one embodiment of the present invention will be described based on the drawings. Figure 1 is a block diagram showing the configuration of the gas station system applied to the gas station of this embodiment. weighing machines 1-1, . . . 1-n (determined)
, a gas station building 2 is installed, and an underground tank 3 is buried beneath the gas station. Each of the weighing machines 1-1, . A flow meter 8 placed midway to measure the flow rate and piping 7 inside the meter
A refueling nozzle 10 attached to the tip of a refueling hose 9 disposed on the downstream side of the refueling hose 9, and an ON signal 10 when the refueling nozzle 10 is removed from/reverted to a nozzle hook (not shown).
A nozzle switch 11 that outputs an FF signal to a weighing machine control section 13 (described later), a weighing machine sound generator 12 that generates a sound saying "Refueling is prohibited" when an oil leak in the underground tank 3 is detected, and each part of the weighing machine. It includes a weighing machine control section 13 for controlling the weighing machine, and a display (not shown) disposed on the outer wall of the weighing machine for displaying the amount of refueling and a message such as "refueling prohibited". In addition, a liquid level gauge 14 is installed in the underground tank 3, and calculates the amount of remaining oil in the underground tank 3 from the liquid level data detected by the liquid level sensor installed in the underground tank 3. is output to a common control device 15, which will be described later. In this case, in this embodiment, there is a one-to-many correspondence between underground tanks and weighing machines (oil liquid is supplied from one underground tank to multiple weighing machines), and this relationship is hereinafter referred to as "the underground tank concerned". It is called a "system" weighing machine. In addition, illustrations of other underground tanks, liquid level gauges that measure the amount of remaining oil in other underground tanks, and multiple measuring machines that pump oil liquid from other underground tanks are omitted. Identification numbers (NO, 1 to NO, n) are attached. In addition, each of the above-mentioned weighing machines 1-1, ... 1-
For convenience, each part constituting n is given the same reference numeral. On the other hand, a common control device 15 that controls each part of the gas station system is installed in the indoor area 2A of the gas station building 2.
The common control device 15 and each of the weighing machines l-1, . . . l-
n weighing machine control units 13 are connected via a serial interface. The common control device 15 polls each weighing machine control unit 13 of each weighing machine 1-1, . , whether the vehicle is refueling or on standby, etc.);
It is designed to send various commands, receive refueling reports, etc. In addition, in the indoor 2A, there is an indoor display board 16 that notifies the user of an oil leak in the underground tank by lighting a lamp, etc., and a display board 16 that makes a sound that says "Refueling is prohibited due to the detection of an oil leak in the underground tank." Data transmission consisting of a voice generator 17 and, for example, a multi-function telephone, etc., for auto-calling a pre-recorded voice saying "Refueling is prohibited" to a set light (for example, the home of a gas station manager, etc.) via a telephone line. Machine 18 and
A printer 19 is installed to print out information such as the oil leakage underground tank number, the time on a built-in calendar (not shown), and the amount of oil leakage (±XX). In addition, there is a leak outside the gas station building 2 due to the detection of oil 'EiAa' in the underground tank.
A driveway sound generating device 20 is installed to generate a sound saying "Refueling is prohibited". Further, a leakage management table 21 as shown in FIG. 2 is stored in the memory (path shown) of the common control device 15. The leakage management table 21 includes a current remaining oil amount area A1 that stores the current amount of remaining oil for each underground tank, and a full amount area A1 that stores the amount of full oil for each underground tank (the amount of oil at the latest oil filling end). A tank oil amount area A2, and a measurement time and minute area A3 that stores the oil leakage measurement start time (X hours and minutes) of the underground tank, which is measured by the built-in calendar (illustrated path) of the common control device 15, for each underground tank. , All weighing machine standby flag A4 that stores whether all weighing machines of the underground tank system are in standby state (1: standby state, 0: non-standby status @) for each underground tank, and all weighing machines of the underground tank system. The amount of remaining oil in the tank when the machine is on standby is stored in the standby oil amount area A5 for each underground tank, and the amount of oil supplied by all the measuring devices in the underground tank system is measured by the level gauge of the underground tank. Error range area A6 stores the error range for each underground tank with respect to the oil reduction amount (oil amount decreased due to refueling), and the refueling of all measuring machines of the underground tank system is stored in the cumulative refueling amount area AIO (described later). It is composed of a total refueling cumulative amount area (illustrated path) that stores the cumulative cumulative amount for each underground tank. Furthermore, the leakage management table 21 includes a weighing machine number area A7 that stores the number of the weighing machine of the underground tank (NO-3 indicates the end of the weighing machine data in the leakage management table 21) for each underground tank, and a refueling machine number area A7. A refueling flag A8 that stores whether or not (1: refueling amount, O: refueling amount) is stored in each measuring machine side of each underground tank system, and whether or not refueling is in progress (1: refueling, 0° non-refueling) The refueling flag A9 is stored in each measuring machine of each underground tank system, and the cumulative amount of refueling that is accumulated each time oil is pumped up and refueled from the underground tank is stored in each measuring machine of each underground tank system. The integrated refueling amount area AIO,
Average refueling amount (for example, regular gasoline: 4 (H!), high-octane gasoline: 40 (2, diesel oil + 7CN2. Kerosene: '
1812, etc., which is a guideline for the amount of refueling at one refueling time, but is not limited to this), is stored in each measuring machine of each underground tank system. . Furthermore, the leakage management table 21 shows the standby oil leakage amount (common to all underground tanks, for example, 200ρ in this embodiment, but not limited to this value) when all measuring machines of the underground tank system are on standby. a standby leakage area AI2 that stores the amount of oil leakage (not available); and a leakage monitoring time that stores the oil leakage monitoring time (common to all underground tanks; in this example, it is set to 30 minutes, for example, but is not limited to this time). It consists of an area A13 and a tank MAX value area (path shown) that stores tank MAX values corresponding to the total number of installed underground tanks at the gas station. In this case, the average amount of refueling, the amount of oil leakage during standby, and the oil leakage monitoring time are set in advance when the fueling station system is in operation. Then, the common control device 15 stores the data in the area A13 after all the weighing machines in the underground tank system are in a standby state (even though there should be no change in the liquid level in the underground tank). When the oil leakage monitoring time has elapsed and there is an increase or decrease in the standby oil leakage amount stored in the area A12 in the underground tank (increase: infiltration of rainwater, etc., decrease: oil leakage). is the weighing machine sound generator 12
, the indoor display board 16, the sound generator 18, and the driveway sound generator 20 notify the user that "refueling is prohibited," and the data transmitter 18 emits the sound "refueling prohibited." ) and call printer 1.
9, the oil leakage detection underground tank N○/oil leakage detection time/oil leakage amount, etc. are printed out. Furthermore, in this embodiment, when starting the oil filling work, press the "arrival" key on the keyboard of the illustrated path of the common control device 15, and input the underground tank number in which the oil filling work is to be performed, the type of oil to be filled, and the amount of oil to be filled. It has become. Thereafter, when finishing the oiling work, press the "Confirm" key (not shown) on the keypad and specify the underground tank number where the oiling work has been completed, and the common control device 15 will be installed in the underground tank with the specified number. Based on the liquid level data output from the liquid level gauge 14, the amount of oil in the designated underground tank at the end of oil filling is detected and displayed on a display (not shown). Then, when the gas station employee who visually watches the display presses a "set" key (not shown), it becomes possible to pump up the oil from the underground tank of the specified number. That is, upon pressing the "set" key, the common control device 15 sets the current remaining oil amount area Al of the specified No. underground tank system in the leakage management table 21;
The amount of oil in the underground tank at the time of the latest oil filling, measured by the liquid level gauge 14, is written in the full oil amount area A2. Next, the operation of this embodiment with the above configuration will be explained with reference to FIGS. 3 to 5. ◎Main processing (Fig. 3) When detecting an oil leak in each underground tank, the common control device 15 starts scanning the underground tanks from No. 1 and then (
In step 5A1), it is determined whether the number of the scanned NOZ underground tank exceeds the tank MAX value stored in the tank MAX value area of the leakage management table 21 (step 5A2). If it is determined that the number of underground tanks of NO, Z exceeds the MAX value, reset the number of scanning underground tanks to NO, l. Step 5A
3), return to step SA2, while No. If it is determined that the number of the underground tank in Z does not exceed the MAX value, after executing the scanning process in the NO, Z underground tank in Figure 4 (step 5A4), move the underground tank to be scanned to NO, Z+1. Update Step 5A5), Step S
Return to A2. ◎ Underground tank interior scanning process (Figure 4) The common control device 15 starts scanning the weighing machine connected to the underground tank based on the leakage management table 21 (step 5BI), and checks the leakage management table 21 for the underground tank. Read the first weighing machine No. from area A7, and determine whether the weighing machine No. is 0 (whether or not the weighing machine data in the leakage management table 21 has ended) (step 582);
If the weighing machine No. is O (weighing machine data completed), return to the main process in Figure 3 and scan the underground tank for the next NO, while if the weighing machine No. is not O (weighing machine data not completed), Polling is performed to the No. weighing machine read out in the Xth time (step 5B3). Next, a refueling amount report based on the end of refueling is sent from the weighing machine control unit 13 of the No. Step 5B4) determines whether or not the message format is a message format in which the byte consists of the amount of refueling (but is not limited to this), and if a report of the amount of refueling is received, the process moves to step SB5, If the fuel supply amount report is not received, the process moves to step SB9. The common control device 15 answers No in step SB4. If it is determined that a refueling amount report has been received from the X measuring machine, refueling will occur by the No. read measuring machine and the standby state of all the measuring machines will be broken, so the leakage management table 21 corresponding to the underground tank will be All weighing machines standby flag A
4 (step 5B5). Then, "O" indicating not refueling is written to the refueling flag A9 corresponding to the No. read measuring machine of the underground tank system in the leak management table 21 (step 5B6), and the fifth
After executing the tank leak check process shown in the figure (step 5)
B7), the scanning weighing machine is updated to x+1st step 5B8), and the process returns to step SB2. On the other hand, in step SB4, if the common control device 15 does not receive the refueling amount report from the No. measuring machine read out in the 5B9), the relevant No.
If the measuring machine of NO is in the pump lock state, the process moves to the above step S88, while if no response indicating that the pump is in the locked state is received, a message indicating that the measuring machine of NO is in the refueling state is received. It is determined whether or not a response indicating the request has been received (step 5BIO). If a response indicating that the No. measuring machine is in the refueling state is received, "1" is written to the refueling flag A9 corresponding to the No. measuring machine of the underground tank system in the leak management table 21 (step 5B).
11a) After writing "0" to the all weighing machine standby flag A4 (step 5811b), the process moves to step SB8, but no response indicating that the pump is in the locked state is received from the corresponding No. weighing machine. If so, step 5B1
Move to 2. Next, the common control device 15 selects this Xth read No.
It is determined whether or not a response indicating that the weighing machine is in the standby state is received from the weighing machine (step 5BI2), and if no response is received indicating that the weighing machine is in the standby state, the step
On the other hand, when the process moves to B8 and a response indicating that it is in a standby state is received, the refueling flag A9 of all the measuring machines of the underground tank system in question in the leakage management table 2I is read out (step 5B13). Next, it is determined whether or not the refueling flag A9 of all the measuring machines of the underground tank system is "O", that is, whether or not they are on standby (step 5B14), and if it is determined that they are not on standby, step SB8 is performed. On the other hand, if it is determined that the weighing machine is on standby, it is determined whether or not the all weighing machine standby flag A4 of the underground tank system is set to "1" (step 5B15). In step 5B15, the common control device 15 moves to step 5B20 if the all weighing machine standby flag A4 of the underground tank system is "1";
”, write the oil leakage measurement start time (X hours, Step 5B16) Next, based on the liquid level data output from the liquid level gauge 14 installed in the underground tank, read out the remaining oil amount in the underground tank. Step 5B17) This remaining oil amount , leakage management table 2
It is written to the current remaining oil amount area AI of the underground tank system No. 1 and the remaining oil amount area A5 when all measuring machines are on standby for the underground tank system (step 5B18). That is, immediately after all the measuring machines in the underground tank system enter the standby state, the common control device 15 measures the amount of remaining oil and sets a timer for monitoring oil leakage. Next, after writing "1" to the all weighing machine standby flag A4 of the underground tank system in the leakage management table 21 (step 5B19), the process moves to step SB8. On the other hand, if the common control device 15 determines in step 5BI5 that the all weighing machine standby flag A4 of the underground tank system is "1", it is stored in the leakage monitoring time area A13 in the leakage management table 21. The "leak monitoring time" has exceeded the "current time measured using the built-in calendar" - "oil leak measurement start time of the underground tank (measurement time and minutes stored in measurement time and minutes area A3)". In other words, it is determined whether all weighing machines in the underground tank system have been in a standby state for a predetermined period of time (Step S B 20). If the leakage monitoring time has not expired, the process moves to step S88, while
If the time has elapsed, read out the amount of remaining oil from the liquid level gauge 14 installed in the underground tank.Step 5B21
), this remaining oil amount is written into the current remaining oil amount area A1 of the underground tank system in the leakage management table 21 (step S B 22). The common control device 15 refers to the leakage management table 21 and
The current amount of remaining oil in the underground tank is determined by the amount of remaining oil in the underground tank when all measuring machines are on standby, + the amount of oil supplied by all measuring machines in the underground tank system, and the level gauge of the underground tank. It is determined whether the error range with respect to the reduced oil amount exceeded, that is, whether rainwater has entered the underground tank (step 5B23). If it is determined that rainwater has entered the underground tank, the process moves to step 5017 in FIG. 5, whereas if it is determined that rainwater has not entered the underground tank, the process moves to step 5B24. Next, the common control device 15
In this case, "the current amount of remaining oil in the underground tank" is "the amount of remaining oil in the underground tank when all measuring machines are on standby" - "the amount of oil supplied by all the measuring machines in the underground tank system and the liquid level gauge in the underground tank". It is determined whether the difference is within the error range with respect to the amount of oil reduction measured by (step 5B24), that is, whether the oil has leaked from the underground tank. If it is determined that the oil liquid has leaked from the underground tank, the process moves to step 5C20 in FIG. 5, whereas if it is determined that the oil liquid has not leaked, the process moves to step SB8. ◎Tank leakage check process (Figure 5) When the common control device 15 receives a refueling amount report immediately after refueling from the measuring machine that polled, it checks the No. of the underground tank from which the measuring machine that has completed refueling pumps the oil. Determine. Note that this operation is performed every time the weighing machine finishes refueling and sends a refueling amount report. Next, the common control device 15 reads the cumulative refueling amount (D) of the weighing machine from the leakage management table 21 corresponding to the cumulative refueling amount area AIO that has transmitted the refueling amount report for the underground tank system. In step 5C1), the latest cumulative amount of refueling obtained by adding the current cumulative amount of refueling to this cumulative refueling amount (D) is written into the cumulative refueling amount area AIO (step 5C2). Next, in preparation for calculating the total value <S> of the cumulative refueling amount of all the measuring machines of the underground tank system, after clearing the total refueling cumulative amount area (path shown) of the leak management table 21 (Step 5C3), the scanning of the weighing machine is started from No. 1 (Step 5C4). Next, it is determined whether the weighing machine No. area A7 of the underground tank system read from the leakage management table 21 is "0" (no weighing machine data) (step 5C5), and the weighing machine No. area A7 is not "0". If so, the process moves to step SC6, while if it is "0", the process moves to step 5C13. The common control device 15 is the third in the leak management table 21.
After reading out the refueling flag A9 of the lower tank system NO and Y measuring machine (step 506), the refueling flag A9 becomes “1”.
” (during refueling) or not (step 5c7), “
1" (refueling), proceed to step 5c described below.
On the other hand, if it is determined that it is not "1" (not refueling), the cumulative refueling amount area AIO corresponding to the NO, Y measuring machine of the underground tank system in question in the leak management table 21
Step 5C8) reads the cumulative amount of refueling (D) from the step 5C8). Next, the total refueling amount (S) stored in the total refueling amount area (shown in the diagram) is added to the total refueling amount 1 read from the refueling cumulative amount area AIO! After adding (D) and storing this added value in the total refueling cumulative amount area (step 5C9), the scanning weighing machine is updated to N01Y+1 (step 5CIO), and the process returns to step SC5. On the other hand, the common control device 15 determines in step SC7 that the refueling flag A9 of the NO, Y measuring machine of the underground tank system is "
1" (refueling), the average refueling amount (H) from the average refueling amount area All corresponding to the N03Y measuring machine of the underground tank system in the leak management table 21 (this average refueling amount is considered as the refueling amount) and refueling amount accumulation area AI
Read the cumulative amount of refueling (D) from O (Step 5CII
). Next, add the average refueling amount (H) read from the average refueling amount area All and the cumulative refueling amount (D) to the aggregate refueling amount (S) stored in the aggregate refueling amount area, After storing this added value in the total refueling cumulative amount area (step 5C12), the process moves to step 5CIO. On the other hand, if the common control device 15 determines in step SC5 that the weighing machine No. area A7 of the underground tank system read from the leakage management table 21 is "0" (no weighing machine data), installed liquid level gauge 14
Read the remaining oil amount in the underground tank from (step 5C1
3). Next, the amount of remaining oil in the underground tank is measured in the current remaining oil amount area A1 of the underground tank system in the leakage management table 21.
(Step 5C14). Next, the common control device 15 determines that the "full amount of oil in the underground tank concerned" at the time of the end of refueling - the "current amount of remaining oil in the underground tank" at the current time is the "full amount of oil in the underground tank concerned" as of the end of refueling. Total cumulative amount of refueling for all measuring machines in the system” - “
Check whether the amount of oil supplied by all measuring machines in the underground tank system is within the error range of the amount of oil loss measured by the level gauge of the underground tank, that is, whether rainwater has entered the underground tank. Determination is made (step 5C15). If it is determined that rainwater has entered the underground tank, step 5C1
On the other hand, if it is determined that rainwater has not entered the underground tank, the refueling is calculated as follows: "Full oil amount in the underground tank" - "Current remaining oil amount in the underground tank" at the end of refueling After refueling, the "accumulated amount of refueling from all measuring machines in the underground tank system", "the amount of refueling by all measuring machines in the underground tank system", and "the amount of reduced oil measured by the level gauge of the underground tank". whether it exceeds the error range of
That is, it is determined whether oil has leaked from the underground tank (step 5C16). If it is determined that the oil liquid has leaked from the underground tank, the process moves to step 5C20, whereas if it is determined that the oil liquid has not leaked out, the process returns to the inside-tank scanning process shown in FIG. 4. Next, the common control device 15 performs step 1 above. If it is determined that rainwater has entered the underground tank in step 5015 and step 5B23 in FIG. After sending the command (step 5C1
7) Write O11 indicating that refueling is not possible in the refueling permission flag A8 of all the measuring machines of the underground tank system in the leakage management table 21 (step 5C18). After this, the common control device 15
sends an alarm command instructing to prohibit refueling to the weighing machine control unit 13 of all the weighing machines of the underground tank system, and displays "Refueling prohibited, error No. (
Rainwater intrusion underground tank No. 5C19). Next, if the common control device 15 determines in step 5CI6 and step 5B24 in FIG. 4 that oil has leaked from the underground tank, the common control device 15
Step 5020) Turn on the lamp on the indoor display board 16 installed at A to notify of the oil leak in the underground tank.
, the sound generator 17 generates a sound saying "Refueling is prohibited" to notify the user of an oil leak in the underground tank (step 5).
C21). Further, the common control device 15 uses the printer 19 installed indoors 2A to print out information such as the oil leakage underground tank N○, the time of the built-in calendar (indicated path), the amount of oil leakage (±XX), etc. (step 5022). , generates a sound saying "Refueling is prohibited" from the driveway sound generator 20,
Notify of oil leakage in the underground tank (step 5C2)
3). Furthermore, when the gas station is closed for business, such as on opening days or at night, the data transmitter 18 transmits the voice message "Refueling is prohibited", which has been recorded in advance on the built-in tape recorder (indicated path), via a telephone line to a set light (e.g. An auto-call is made to the residence of the person in charge of the gas station, etc., to notify them of rainwater intrusion or oil leakage into the underground tank (step 5C24). Thereafter, the process returns to the tank internal scanning process shown in FIG. That is, according to this embodiment, it is possible to detect rainwater intrusion into each underground tank and detect oil leakage based on the amount of remaining oil measured by the liquid level gauge 14 installed in each underground tank. It is possible and suitable to introduce this into existing gas stations. Additionally, if rainwater/groundwater, etc. is detected to have entered the underground tank, the pump is immediately locked, thereby preventing the problem of refueling with oil mixed with rainwater/groundwater, etc. In addition, since the oil leakage rate of the underground tank is constantly monitored, and if the oil leakage rate is sudden, an auto-call is made via the data transmitter 18, an accurate oil leakage detection system can be established.

[Modified example]

■In the above embodiment, the common control device uses a polling method to collect the operating status of each weighing machine (whether the pump is locked or not, whether it is refueling or on standby, etc.), sends various commands, receives refueling reports, etc. However, the present invention is not limited to this, and it is also possible to use a contention (mutual activation) method. ■In the above embodiment, the underground tank and the plurality of weighing machines are connected by a common pipe, but the configuration is not limited to this, and it is also possible to connect the underground tank and the plurality of weighing machines by individual pipes. . As a result, for example, an oil leak in the underground tank is not detected based on the oil supply report received from the NO,n meter, and an oil leak in the underground tank is detected based on the oil supply report received from the N01m meter. If this is detected, it is possible to indirectly detect oil leakage from the piping connecting the underground tank and the NO, m meter, which is preferable.

【Effect of the invention】

As explained above, according to the present invention, the following effects can be achieved. ■Since oil leakage in an underground tank can be detected based on the amount of remaining oil measured by a level gauge installed in the underground tank, the gas station system of the present invention can be smoothly introduced into existing gas stations. is possible and suitable. ■Since it is possible to accurately detect the infiltration of rainwater, etc. into underground tanks, it is now possible to immediately lock the pump drive motor of the weighing machine. It is possible to prevent the problem of refueling.

[Brief Description of the Drawings] Fig. 1 is a block diagram showing the configuration of a gas station system installed at a gas station according to an embodiment of the present invention, and Fig. 2 is a block diagram showing the configuration of a gas station system installed in a gas station according to an embodiment of the present invention. 3 is a flowchart of the main processing of this embodiment, FIG. 4 is a flowchart of tank internal scanning processing of this embodiment, and FIG. 5 is a flowchart of tank leakage check processing of this embodiment. It is. 1-1, l-n... Weighing machine, 3... Underground tank (tank), 12... Weighing machine voice generator (notification means), 13... ...Weighing machine control section, 14
...Liquid level gauge (residual oil amount measuring means), 15...
... Common control device (control means), 16 ... Indoor display board (notification means), 17 ... Sound generation device (
Notifying means), 18... Data transmitter (notifying means), 19... Printer (notifying means), 20...
... Driveway sound generator (notification means), 2
1...Leakage management table (current remaining oil amount storage means, remaining oil amount storage means when all measuring machines are on standby, full tank storage means, cumulative refueling amount storage means).

Claims (2)

[Claims] (1) In a fueling station configured to supply oil from a tank that stores oil to a plurality of measuring machines, the remaining oil amount measuring means measures the amount of remaining oil in the tank, and the remaining oil amount measuring means a current remaining oil amount storage means for storing the current amount of remaining oil in the tank at the current point in time; and a current remaining oil amount storage means for storing the current amount of remaining oil in the tank at the current point in time; a remaining oil amount storage means when all measuring machines are on standby for storing the amount of remaining oil in the tank; a notification means for notifying that refueling is prohibited; a current amount of remaining oil in the tank stored in the current remaining oil amount storage means; Compare the amount of remaining oil in the tank when all measuring machines are on standby, which is stored in the storage means for the amount of remaining oil when all measuring machines are on standby, and if the comparison result deviates from the allowable range after a preset monitoring time has elapsed. A control means that determines that there is an oil leak or rainwater intrusion in the tank, locks the pumps of all measuring machines to which oil is supplied from the tank, and activates the notification means to notify that refueling is prohibited. A gas station system. (2) In a fueling station configured to supply oil from a tank that stores oil to a plurality of measuring machines, the remaining oil amount measuring means measures the amount of remaining oil in the tank, and the residual oil amount measuring means A full oil amount storage means that is measured and stores the amount of full oil in the tank at the end of lubrication; and a current remaining oil amount that is measured by the remaining oil amount measuring means and stores the current amount of remaining oil in the tank at the current point in time. a storage means; a cumulative oil supply storage means for storing a cumulative oil supply amount obtained by summing up the oil supply amounts from all measuring machines that supply oil from the tank; a notification means for notifying that refueling is prohibited; and the full tank oil amount. The amount of oil obtained by subtracting the current remaining oil amount of the tank stored in the current remaining oil amount storage means from the full oil amount of the tank stored in the storage means, and the amount of oil from the tank stored in the cumulative amount of refueling amount storage means. Compare the cumulative amount of oil supplied from all measuring machines to which oil is supplied, and if the comparison result deviates from the allowable range, it is determined that there is an oil leak or rainwater intrusion in the tank, and the oil is not supplied from the tank. A fueling station system comprising: control means for locking the pumps of all measuring machines and operating the notification means to notify that refueling is prohibited.