JPH06345200A - Apparatus for monitoring transaction of tank - Google Patents

Abstract

PURPOSE:To detect an amount of change in a storage amount of a tank and an amount of moved contents with a constant frequency so as to prevent defective products from being generated by mixture of unintended oil due to movement of the oil to an erroneous direction and also to maintain safety of equipment. CONSTITUTION:A tank transaction monitoring apparatus is obtained, comprising a storage amount signal generator 1 for outputting a signal indicating an amount of oil stored in a tank, a moved oil amount signal generator 2 for outputting a signal indicating an amount of moved oil to be received to/discharged from the tank and an arithmetic processor 3 for inputting the signals from the storage amount signal generator 1 and the moved oil amount signal generator 2, calculating difference between both signals with a constant frequency and for monitoring whether or not the difference is within a predetermined range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for monitoring whether oil is transferred properly from an oil storage tank.

[0002]

2. Description of the Related Art In the conventional method, when the oil transfer work is completed, the increase / decrease in the storage amount of the tank is compared with the integrated value of the flow meter to monitor whether the oil transfer work is performed correctly. To do. Therefore, it is difficult to know the change in the movement amount until the work is completed even if the tank is erroneously selected and the piping of the tank wraps around.

[0003]

SUMMARY OF THE INVENTION According to the present invention, even while the work of transferring oil from a tank is in progress, the amount of change in the amount of storage in the tank and the amount of movement are detected at a constant cycle to detect the oil. The purpose is to prevent the generation of defective products due to mixing of unintended oil by moving in the wrong direction, and also to maintain the safety of the equipment.

[0004]

In order to achieve the above object, a tank is provided with a storage amount signal transmitter for outputting a signal indicating the storage amount of oil stored therein, and the oil is received from and discharged from the tank. An oil movement amount signal transmitter that outputs a signal indicating the movement amount of oil is provided in the pipeline. The signals from the storage amount signal transmitter and the oil movement amount signal transmitter are input, and the difference between the two signals is calculated at a constant cycle. For the period for calculating the difference, if the oil transfer work is a short time, for example, the difference in hour units is calculated, and if the oil transfer time is a long time for several days, the difference in daily units is calculated. And an arithmetic processing unit for monitoring that the difference is within a predetermined range.

[0005]

According to the present invention, the tank storage amount is notified to the tank receipt / payment monitoring device by the signal from the storage amount signal transmitter, and the amount of oil moving from the oil movement amount signal transmitter in the intended direction is sent. It is input and grasped at regular intervals. Therefore, the increase / decrease in the storage amount of the related tank and the moving amount of the oil to be received / received can be compared every moment. In response to the above signal, the tank receipt / payment monitoring device performs a predetermined calculation to constantly monitor the correlation between them. Further, it is possible to store the amount of oil stored, the record of movement, and other necessary data, and when an abnormality is detected, an alarm can be issued from a CRT, a printer or the like.

[0006]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numeral 1 is a storage amount signal transmitter, which outputs a signal indicating the storage amount of oil stored in the tank.

Reference numeral 2 is an oil movement amount signal transmitter, which outputs a signal indicating the movement amount of the oil received and delivered to the tank.
Reference numeral 3 denotes an arithmetic processing unit, which receives signals from the storage amount signal transmitter and the oil movement amount signal transmitter, calculates a difference between both signals at a constant cycle, and the difference is within a predetermined range. Monitor that you are.

Reference numeral 4 denotes a CRT and a keyboard, which display and operate the arithmetic processing unit 3. A printer 5 records the storage amount of oil, the record of movement, and alarms. The monitoring operation during oil movement will be described with reference to FIG.

Step 1 At every hour on the hour, the storage tank and piping system in which the oil operation is being performed are searched to determine the collection target of the operation results. Step 2 Read the signals from the storage amount signal transmitter and the oil movement amount signal transmitter, input the monitoring data regarding the material balance, etc., and enter the tank database, the oil movement amount database,
Create a material balance monitoring database. Material balance means that the amount of oil received and delivered from the tank is equal to the amount of oil movement.

Step 3 The work record of the oil transfer amount obtained in step 2 is collected from the oil transfer amount database, and the storage amount of the target tank is collected from the tank database. Step 4 The difference amount is calculated from the storage amount in the tank and the oil transfer amount.

Step 5 An alarm is issued when the difference amount per hour or day deviates from the permissible variation range. Step 6 The work record and storage amount of each tank collected this time are stored in the oil movement amount monitoring database and used as the data for the difference amount calculation in the next cycle.

A method for calculating the difference amount in step 4 will be described with reference to FIG. X is a time axis and represents the time when the work is started at 1:00 and the time thereafter. Y is a quantity axis and represents the storage amount of the tank or the oil transfer amount in KL units. A graph shows the amount of deductions for the tanks. Graph B shows the storage capacity of the tank. (When the storage amount is 0 at the start of work) a _{0 to} a ₃ are the deducted and received amounts of the tank at each time.

B _{0 to} b ₃ are the storage amounts of the tank at each time. E _HL is a variation allowable lower limit (KL / H) of the difference per hour for each tank. E _HH is the upper limit (KL / H) of the variation permissible value of the difference per hour for each tank. E
_DL is the lower limit of the permissible variation per day for each tank (K
L / H). E _DH is an upper limit (KL / H) of the variation permissible value of the difference per day for each tank.

The arithmetic processing unit 3 performs arithmetic processing according to the following equation, and monitors whether the difference is within an allowable value. (1) One-hour monitoring formula Monitoring after 2 hours E _HL <(a ₂ −a ₁ ) − (b ₂ −b ₁ ) <E _HH formula 1 Monitoring after 3 hours E _HL <(a ₃ −a ₂ ) − (b ₃ −b ₂ ) <E _HH formula 2 Similarly, the difference between the tank deduction amount and the tank storage amount per unit time (here, 1 hour) is calculated from the work start time. To do.

(2) Daily monitoring formula Monitoring after 2 hours E _DL <(a ₂ −a ₀ ) − (b ₂ −b ₀ ) <E _DH formula 3 Monitoring after 3 hours E _DL < (A ₃ −a ₀ ) − (b ₃ −b ₀ ) <E _DH equation 4 Similarly, the amount of deducted amount of the tank and the stored amount of the tank from the work start time (as 0 o'clock) to the calculated time are similarly described. Calculate the difference every hour. In this way, calculation is performed for up to 24 hours.

Formula 1 will be described with reference to FIG.
The work starts at 1 o'clock and goes to the tank within 1 hour until 2 o'clock
Amount of oil received (a ₂-A₁The amount of oil dispensed from
(B₂-B₁) Is shown. This value is
Set E_HHE below_HLCheck whether it is within the above range
To see.

If this value is equal to or more than E _HH , there is a leak in the tank and the storage amount does not increase correctly, or the connection of the inflow and outflow pipes to the tank is abnormal and the metering is not performed correctly. If this value is less than E _HL, it may be due to an abnormal connection between the inflow and outflow pipes to the tank, causing incorrect measurement, etc.
An alarm is issued on T to prompt treatment. Take into account errors in the measuring instruments and take prompt measures to prevent product defects.

Formula 3 The formula 3 is to calculate the allowable variation value of the difference for up to 24 hours and monitor whether it is within the upper and lower limits. FIG. 4 is a configuration diagram showing an embodiment of the two-tank system equipment. The material balance of the tank B is monitored. JOB1 indicates a work for moving the oil from the tank A to the tank B, and JOB2 indicates a work for moving the oil from the tank B to the ship.

Tank B reception result = Flowmeter 1 performance Tank B delivery performance = Flowmeter 2 performance Tank B storage performance = Storage signal transmitter 6 performance FIG. 5 is a graph showing the results of JOB1 and JOB2 and the storage amount of the tank. (1) Monitoring in units of 1 hour Monitoring at 2 o'clock Calculation of Equation 1 The amount of change in the deduction amount of the tank B by JOB1 and JOB2 from 1 o'clock to 2 o'clock is (400 + (-200))-(0 + 0) = 200 KL The storage fluctuation amount of the tank B from 1:00 to 2:00 is 1190-1000 = 190 KL That is, the difference amount between the fluctuation amount of the deduction amount and the tank storage fluctuation amount from 1:00 to 2:00 is 200-190 = 10. KL
Becomes

Monitoring at 3 o'clock Calculation of Equation 2 The amount of change in the deduction amount of tank B due to JOB1 and JOB2 from 2 o'clock to 3 o'clock is (800 + (-400))-(400 + (-200))
= 200 KL, the storage fluctuation amount of the tank B from 2 o'clock to 3 o'clock is 1300-1190 = 110 KL That is, the difference amount between the fluctuation amount of the deduction amount and the tank storage fluctuation amount from 2 o'clock to 3 o'clock is 200-110 = 90 KL
Becomes

When this difference exceeds the per-hour fluctuation allowable value of the tank B, an alarm is generated. (2) Daily monitoring Monitoring at 2 o'clock Calculation of Equation 3 The amount of change in the deduction amount of tank B due to JOB1 and JOB2 from 0:00 to 2:00 is (400 + (− 200)) − (0 + 0) = 200 KL The storage fluctuation amount of the tank B from 0:00 to 2:00 is 1190-1000 = 190 KL That is, the difference amount between the fluctuation amount of the deduction amount and the tank storage fluctuation amount from 1:00 to 2:00 is 200-190 = 10. KL
Becomes

Monitoring at 3 o'clock Calculation of Equation 4 The fluctuation amount of the deduction amount of the tank B by JOB1 and JOB2 from 0 o'clock to 3 o'clock is (800 + (-400))-(0 + 0) = 400 KL from 0 o'clock The storage fluctuation amount of the tank B at 3:00 is 1300-1000 = 300 KL. That is, the difference amount between the fluctuation amount of the deduction amount and the tank storage fluctuation amount from 0:00 to 3:00 is 400-300 = 100K.
It becomes L.

When the difference exceeds the per-day variation allowable value of the tank B, an alarm is generated.

[0024]

According to the present invention, the difference between the deduction amount of the tank and the increase / decrease amount of the storage amount of the tank is calculated in a constant cycle,
Since it has been decided to monitor that it is within the predetermined range, there is an effect that it is possible to confirm that the movement route is appropriate together with the selection of the related tank even during the oil movement work.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart of a material balance monitoring process.

FIG. 3 is an explanatory diagram of a calculation formula of a difference amount.

FIG. 4 is a diagram showing an example of two-tank system equipment.

FIG. 5 is an implementation graph of receipt and payment of two-tank system equipment and storage.

[Explanation of symbols]

 1 storage amount signal transmitter 2 movement amount signal transmitter 3 arithmetic processing unit 4 CRT 5 printer 6 storage amount signal transmitter

Claims (1)

[Claims] 1. A storage amount signal transmitter that outputs a signal that indicates the amount of oil stored in a tank, and an oil movement amount signal transmitter that outputs a signal that indicates the amount of movement of oil that is received and sent to the tank. And an arithmetic process for inputting signals from the storage amount signal transmitter and the oil movement amount signal transmitter, calculating a difference between both signals at a constant cycle, and monitoring that the difference is within a predetermined range. A tank receipt / payment monitoring device comprising: a device.