RU2593446C1 - Method for automatic control of metrological characteristics of measuring devices of mass of oil or liquid oil products during tempering at fuel bases - Google Patents

Abstract

FIELD: measuring equipment.

SUBSTANCE: method for automatic control before and after each tempering operation includes automatically recording measurement results of the mass of oil or oil products and automatically performing comparative analysis of measurement results of the mass of tempered oil or oil products based on the data from least three measuring devices. Data from automatic system of measurement in reservoirs, data from gas filling devices, data from automatic system of measurement in receiving tanks and tanks of vehicles with accumulation of statistics, facts of exceeding the limit of errors of measurement by separate measuring devices to prepare a conclusion are used to determine the possibility of further operation or necessity of unscheduled checking of measuring devices. For the analysis results of three unequally accurate measurements of the mass of the tempered oil or oil products the method of comparing measurement results to determine total arithmetic average is used, and for each measuring device used in tempering. Comparing actual deviation from the total arithmetic average with the maximum allowable deviation

, where M_i is the mass of tempered oil or oil products according to i measurement device; M_o - total arithmetic average of measurement results; ΔM_i - minimum permissible deviation of the result of a single measurement from the total arithmetic average for the i measurement device.

EFFECT: technical result - method for automatic control of metrological characteristics of measuring devices, possibility of timely detection of deviation of metrological characteristics of measuring devices from determined operating values without stopping the main process of tempering of oil or oil products.

1 cl, 1 dwg

Description

The invention relates to measuring equipment and can be used as part of automated metering systems when dispensing oil or oil at fuel bases, in particular at oil depots and gas stations.

A device for metrological control of flow meters is known (RU 69234, PC: G01F 25/00 (2006.01)) for operational metrological control of the flow meters in the field by comparative analysis of the readings of the monitored and reference flow meters when outputting to the monitor the measurement error of the flow relative to the reference flow meter in percentage terms. The device is used to measure the volume and flow rate of water coming from a well or into an injection well, as well as for studying pipelines using a telemetry system. The device is designed for operation in the open air, in climatic conditions of macroclimatic regions with a temperate and cold climate when exposed to a combination of climatic factors characteristic of these areas. Using the device allows you to expand its functionality by taking into account the full operational resource of a functioning flowmeter under climatic and mechanical conditions when comparing it with a reference flowmeter taking into account environmental factors.

The disadvantage of this device is the ability to control only one type of SI, namely flow meters, and in order to perform a control operation when oil or oil is drained into tanks, the main technological process must be stopped.

The measuring and computing complex for collecting and processing information from accounting systems of NP OKTOPUS-L (RU 96954, IPC: G01F 1/00 (2006.01)) is designed to work as part of systems for measuring the quantity and quality indicators of NP. As a reference measuring instrument for monitoring the metrological characteristics of the metering unit of the NP, a turbo-piston calibration unit is used in the system. The disadvantage of this method is the need for additional metrological equipment (one or several turbo-piston installations), the complexity of installation of the installation (changes in the piping scheme), as well as the ability to control metrological characteristics of only SI on the stream, i.e. flow meters.

There is also a method of monitoring the safety of metrological characteristics of automated measuring systems (RU 2399945, G05B 13/00 (2006.01), G05B 23/02 (2006.01)) containing controlled sources of test effects, meters of informative parameters, meters of parameters of uncontrolled external influences and computers, including control of the parameters of the test actions according to the computer program, counting with the help of the computer of the values of the measured informative parameters and the parameters of the uncontrolled external influences, processing of the measurement results using y computer according to a given program, measuring the values at the inputs of the corresponding meters of informative parameters and parameters of uncontrolled external influences, repeating the measurement at least 100 times to obtain representative samples. As a reference value of the measured value to control the metrological characteristics of SI, a test signal is applied to the input of the meter of informative parameters of the test effect from a computer-controlled source of test actions. The technical result is to increase the calibration interval of measuring systems, increasing the efficiency and reliability of the control of complex SI. The method is suitable for monitoring systems designed to measure physical quantities whose values are predetermined and can be modeled by the output signal of the source of test influences, and cannot be used to control the metrological characteristics of the SI mass of oil or oil, which is its main drawback.

Closest to the claimed method is a method of automated accounting and information of the commodity balance of oil products at oil depots and gas stations (RU 2344379, G01F1 / 86 (2006/01), G01F 17/00 (2006/01), G01F 15/06 (2006/01) ), in which the computer is recorded and compared with the documentary mass of NPs (according to book balance) currently in the tank, then the amount of unbalance between them is calculated with the sign of the unbalance and the doses of NPs are adjusted so that the amount of unbalance actual mass of oil or oil in the reservoir e and tempered commodity weight oil or NP, reflected in accounting documents, seeks to match. The technical result consists in the continuous ongoing automatic minimization of the unbalance of the mass of oil or oil between the accounting and actual data of the balance of the mass of material in storage tanks and the ability to accurately align SI and accounting data, that is, to balance the real and recorded data on accounting documents .

The disadvantage of this method is the high probability of the uncertainty of the measurement results, due to the fact that, based on the comparison of the measurement results by different SIs, they make adjustments to the measurement result made by two SIs, one of which is considered to be knowingly more accurate and reliable, namely, the adjustment is made to the measurement results of the tempering device NP, for example, a flow meter or densitometer, which is problematic to attribute to reliable results, since the conclusion about the accuracy of the measurements is made on the basis of comparison with the results of measurement of mass of oil in reservoir or NP exclude the fact that the recorded deviations may be caused by measurement errors, e.g., errors exceeding the limit of the measurement system itself in the tank.

The problem solved by the claimed invention is the timely detection of deviations of the metrological characteristics of SI from the established operational values, which does not require stopping the main technological process of the release of oil or NP.

The technical result is to increase the reliability of the measurement data of the mass of oil or NP due to the continuous comprehensive monitoring of the metrological characteristics of SI at all stages of the movement of oil or NP in the process of their dispensing at fuel bases.

The solution to this problem is achieved by the fact that in a method for automatically controlling the metrological characteristics of measuring instruments (SI) of the mass of oil and liquid oil products (NP) on fuel bases, including comparing the measurement results of SI, according to the invention, the results are automatically recorded before and after each holiday operation measuring the mass of oil or NP and perform an automatic comparative analysis of the results of measuring the mass of the released oil or NP according to at least three SI, namely, according to statistical system of measurement in tanks, according to fuel dispensers (TRK) and according to the data of an automatic measurement system in receiving tanks and tanks of vehicles (on-board fuel metering systems - BSU) with accumulation of statistics on the fact of exceeding the limiting measurement errors by individual SIs to prepare a conclusion about the possibility further operation or the need for unscheduled verification of SI, while for the analysis of the results of three unequal measurements of the mass of released oil or NP, the comparison method is used measurement results with the definition of general arithmetic means, and for each measurement means, applied in the tempering treatment, compared the actual total deviation from the arithmetic middle with a maximum permissible deviation

, где

where

M _i - the mass of the released oil or NP according to the i-th measuring instrument;

M _o is the total arithmetic mean of the measurement results;

ΔM _i is the maximum permissible deviation of the result of a single measurement from the total arithmetic mean for the i-th measuring instrument; moreover, if the condition is not fulfilled, then the fact of exceeding the permissible deviation for this SI is recorded with the detection date and the absolute and relative deviation the results of measuring the mass of oil or NP from the calculated assessment of the measured mass of oil or NP with the subsequent performance of a retrospective analysis of the relevance of the results of the control of SI, based on the following conditions ovia:

, где

where

D _N - a predetermined threshold of relevance of control by the frequency of registration of facts of exceeding the permissible value of deviations;

Z - the number of recorded facts of exceeding the permissible deviation value, since the last SI verification;

Y is the total number of receive operations performed using controlled SI since the last SI verification was performed.

The method of automatic control of metrological characteristics of measuring instruments (SI) of the mass of oil and liquid petroleum products (NP) at the bases is as follows.

Before and at the end of each dispensing operation, the results of measuring the mass of oil or oil in the consumables of the fuel base are automatically recorded according to the automatic measurement system in the tanks and in the receiving tanks or tanks of refueling vehicles according to the BSU.

At the end of each holiday operation, the results of measuring the mass of dispensed fuel according to the fuel dispenser (M _{fuel dispenser} ) are automatically recorded.

According to the SI data in the tank (М _Р ), the mass of the released oil or NP is calculated as the difference between the mass in the flow tank registered before the vacation and the mass in the flow tank registered after the vacation.

According to the BSU (M _BSU ), the mass of dispensed oil or oil is calculated as the difference between the mass in the receiving tank or tank registered after the vacation and the mass in the receiving tank or tank registered before the vacation.

To analyze the results of three non-equal measurements, the general arithmetic mean method or any other method for comparing the results of non-equal measurements is used. The following describes the analysis procedure using the general arithmetic mean method.

For each measurement result, a weighting factor P is calculated, inversely proportional to the square of the marginal error of mass measurement.

, где

where

P _i - weight coefficient of the i-th measurement result;

δ _i - the marginal error of the i-th measurement, determined by the certified marginal error of the applied measuring instrument.

, где

where

P _P - weight coefficient of the measurement result by the automatic system in the tank;

δ _P - marginal passport error of SI in the tank;

R _TRK - weight coefficient of the measurement result of the TRK;

δ _{fuel dispenser} - the maximum passport error of the fuel dispenser;

R _BSU - weight coefficient of the measurement result of the BSU;

δ _BSU - marginal error of the BSU.

The total arithmetic mean of the measurement results (M _o ) is calculated taking into account the weight coefficient of each measurement:

, где

where

P _i - weight coefficient of the result of measuring the mass of the released oil or NP by the i-th measuring device;

M _i - the mass of the released oil or NP according to the i-th measuring instrument;

R _P - weight coefficient of the measurement result by the automatic system in the tank;

M _R - the mass of oil or NP according to SI in the tank;

R _TRK - weight coefficient of the measurement result of the TRK;

M _{fuel dispenser} - the mass of oil or NP according to the fuel dispenser;

R _BSU - weight coefficient of the measurement result of the BSU;

M _BSU - the mass of oil or NP according to the BSU.

The standard deviation of the arithmetic mean is calculated

, где

where

σ _M is the standard deviation of the arithmetic mean;

n is the number of measuring instruments used to measure the mass of oil or NP;

M _o is the total arithmetic mean of the measurement results;

P _i - weight coefficient of the result of measuring the mass of the released oil or NP by the i-th measuring device;

M _i - the mass of the released oil or NP according to the i-th measuring instrument;

R _P - weight coefficient of the measurement result by the automatic system in the tank;

M _R - the mass of oil or NP according to SI in the tank;

R _TRK - weight coefficient of the measurement result of the TRK;

M _{fuel dispenser} - the mass of oil or NP according to the fuel dispenser;

R _BSU - weight coefficient of the measurement result of the BSU;

M _BSU - the mass of oil or NP according to the BSU.

The confidence interval of the random error in measuring the mass of the released oil or NP (Δm _o ) is calculated for a confidence probability of 0.95

Δm _o = 2 * σ _M , where

σ _M - the standard deviation of the total arithmetic mean.

The limit value of the non-excluded systematic error is calculated for each measuring instrument (θ _i )

θ _i = M _i * δ _i , where

M _i - the mass of the released oil or NP according to the i-th measuring instrument;

δi is the limit of the relative error of the i-th measuring instrument.

θ _p = M _p * δ _p , θ _{fuel dispenser} = M _TPK * δ _{fuel dispenser} , θ _BSU = M _BSU * δ _BSU , where

θ _p - the absolute value of the limit of non-excluded systematic error for SI in the tank;

θ _{fuel dispenser} - the absolute value of the limit of non-excluded systematic error for SI in the tank;

θ _BSU - the absolute value of the limit of non-excluded systematic error for SI in the tank;

δ _P - marginal passport error of SI in the tank;

M _R - the mass of oil or NP according to SI in the tank;

δ _{fuel dispenser} - the maximum passport error of the fuel dispenser;

M _{fuel dispenser} - the mass of oil or NP according to the fuel dispenser;

δ _BSU - marginal error of the BSU;

M _BSU - the mass of oil or NP according to the BSU.

The maximum permissible deviation of the result of a single measurement from the total arithmetic mean is calculated for each measuring instrument

, где

where

θ _i is the absolute value of the limit of non-excluded systematic error for the i-th measuring instrument;

Δm _o - confidence interval of a random error in measuring the mass of released oil or NP.

,

,

,

,

, где

where

ΔM _R - maximum permissible deviation for SI in the tank;

ΔМ _{fuel dispenser} - maximum permissible deviation for fuel dispenser;

ΔМ _BSU - maximum permissible deviation for BSU;

θ _P is the absolute value of the limit of non-excluded systematic error for SI in the tank;

θ _{fuel dispenser} - the absolute value of the limit of non-excluded systematic error for SI in the tank;

θ _BSU - the absolute value of the limit of non-excluded systematic error for SI in the tank;

Δm _o - confidence interval of a random error in measuring the mass of released oil or NP.

For each measuring instrument used in the tempering operation, the actual deviation from the total arithmetic mean is compared with the maximum permissible deviation

, где

where

M _i - the mass of the released oil or NP according to the i-th measuring instrument;

M _o is the total arithmetic mean of the measurement results;

ΔM _i - the maximum permissible deviation of the result of a single measurement from the total arithmetic mean for the i-th measuring instrument.

, где

where

M _R - the mass of the released oil or NP mass according to SI in the tank;

M _{fuel dispenser} - mass of dispensed oil or oil mass according to the fuel dispenser;

M _R - the mass of released oil or NP mass according to BSU;

M _o is the total arithmetic mean of the measurement results;

ΔM _R - maximum permissible deviation for SI in the tank;

ΔМ _{fuel dispenser} - maximum permissible deviation for fuel dispenser;

ΔМ _BSU - the maximum permissible deviation for the BSU.

With simultaneous loading through several fuel dispensers, all calculations are performed for the total value of the mass of oil or NP for simultaneously performed operations. In this case, the beginning of the vacation is considered the time of the beginning of the first operation, and the end is the time of completion of the last.

If the condition is met, then we believe that the metrological characteristics of the measuring instrument do not go beyond the permissible (passport) values.

If the condition for any SI is not fulfilled, then the fact of exceeding the permissible deviation for this SI is recorded with the computer storing the date of detection, the absolute and relative value of the deviation of the results of measuring the mass of oil or NP from the calculated estimate of the measured mass of oil or NP, followed by a retrospective analysis of the relevance of the results of the control of SI based on the following conditions:

, где:

where:

D _N is the specified threshold of control relevance by the frequency of recording facts of exceeding the permissible value of deviations, the relevance threshold value is set based on the conditions of no more than one fact of registration for 20 tempering operations (measurements) (D _N = 0.05), performed using controlled SI.

Z - the number of recorded facts of exceeding the permissible deviation value, since the last SI verification;

Y is the total number of receive operations performed using controlled SI since the last SI verification was performed.

If, as a result of the analysis of the relevance of the control results, it is revealed that the control relevance condition is fulfilled (the frequency of registration of facts of excess deviations is greater than D _N ), then the metrological characteristics of this SI are considered to be outside the permissible values, this SI is excluded from the accounting scheme and verified.

The use of a retrospective analysis of the results of monitoring of previous oil or NP dispensing operations recorded since the last verification of controlled SRs fully provides an objective assessment of the reliability of measurements and the relevance of the results of monitoring the metrological characteristics of SR mass of oil or NP.

The SI metrological characteristics monitoring device provides the ability to configure SI connection to any of the standard industrial protocols, at least from the following list: Modbus, Indastrial Ethernet, HART, CAN-based, ProfiBus, P-Net, FF H1, CC-Link, Fieldbus , Lonworks, KNX, IEEE 802.11; In addition, the device provides the ability to configure the receipt of data from measuring instruments according to any software protocol implemented by the SI manufacturer, with its conversion to the canonical protocol of the device.

To perform the monitoring of the metrological characteristics of SI, the main technological process is not stopped (the metrological characteristics are monitored constantly during oil and oil dispensing operations), and there is no need for separate reference, verified measuring instruments or sources of reference influences for each type of controlled measuring instruments.

The drawing shows a functional diagram of a device for monitoring the metrological characteristics of SI, ensuring the implementation of the proposed method.

The device includes an interface unit 1 with an automatic measuring system in tanks, the input of which is connected to the outputs of the SI mass of oil or oil in the tanks; an interface unit 2 with fuel dispensers with a mass measurement function (TRK), the input of which is connected to the information interface of fuel dispensers with a mass measurement function (TRK) and an interface unit 3 with SI in receiving tanks and tanks (on-board metering systems - BSU). The input of the interface unit 3 is connected directly to the outputs of the BSU via a wireless interface or indirectly, through the corporate computer network of the enterprise. The device also contains a registration, analysis and visualization block 4. The inputs of block 4 are connected, respectively, to the outputs of the interface blocks 1, 2, and 3. The input of block 4 is connected to the local computer network (LAN) of the fuel base (tank farm, gas station).

Interface blocks 1, 2 and 3 provide the ability to connect to the SI and read the measurement results, at least one of the following industrial protocols: Modbus, Indastrial Ethernet, HART, CAN-based, ProfiBus, P-Net, FF H1, CC- Link, Fieldbus, Lonworks, KNX, IEEE 802.11 (the specific set of supported protocols and the configuration of the USB are determined by the set of controlled SIs and the characteristics of the industrial network) and converting them to the canonical communication protocol with unit 4. Flexibility, high adaptability and scalability of the system are achieved through the use of in quality Your hardware base for the implementation of the interface blocks 1, 2, 3 of industrial programmable controllers (Programmable Logic Controller, PLC - a class of specialized devices used to automate technological processes) that allow the expansion of external physical data exchange interfaces due to the possibility of connecting additional converters to the standard controller interfaces and implementation in the controller’s memory of algorithms for converting the data stream received from the SI according to the protocol provided by the manufacturer to the canonical protocol in data exchange with the unit 4. As an interface controller for implementing the blocks 1, 2 and 3 controllers Simatic S7 family can be applied or family ControlWave, or their analogs. At the same time, depending on the LAN topology of the enterprise, the geographical location and the number of monitored SIs, each pairing unit can be implemented both on the hardware base of a separate controller and on the basis of a controller common with other interface units, which ensures maximum system flexibility.

Block 4 provides storage in a non-volatile memory of the list of monitored SIs, network addresses / SI identifiers, values of standard errors for each type of SI, storage of configurable NP vacation routes (sets of specific SI instances involved in a separate vacation operation), provides for receipt and registration in non-volatile memory measurement results from each of the SI, implements an algorithm for comparing the measurement results and the analysis of compliance of metrological characteristics of the SI, based on I registered deviations from the maximum permissible deviation of the measurement results. The control results are displayed on the information display integrated into the unit 4 with the possibility of printing the control results on a printing device integrated into the unit 4.

Block 4 is designed as an industrial terminal, for example, on the basis of an industrial computer of the Advantech ARK or iRobo 3000/4000 series or an analogue, and contains data input, display and print data with the ability to connect to a data network via TCP / IP.

In addition, block 4 provides the ability to manually enter the results of measurements performed by non-automated SIs in the event of a switch to the backup NP accounting scheme due to the absence or inoperability of the automated SI at any of the monitored NP dispensing areas or the lack of communication with the BSU. Block 4 also provides the ability to manually enter or automatically receive data from the NP accounting system about the object into the tank / capacity of which oil or NP is dispensed and the fact of the beginning and completion of the receiving operation is recorded. In addition, block 4 provides the ability to configure or retrieve newly created or changed receive routes from the metering system of the acquisition route.

The device operates as follows.

The input of block 4 via the local area network (LAN) of the enterprise receives data from an automated metering system about the fact of the start of an oil or NP dispensing operation and data about the object into which a tank is dispensed with oil or NP. The interface unit 1 converts the input data on the results of measuring the mass of oil or oil in the flow tank at the time of the start of vacation to the canonical protocol for exchanging data with block 4 and transfers them to the input of block 4 for storage. The interface unit 3 connects to the BSU of the object into the tank / tank of which oil or oil is dispensed and converts the input data on the results of measuring the mass of oil or oil in the tank / tank at the time of the start of vacation to the canonical data exchange protocol with block 4 and transfers them to the input of block 4 for storage.

In the process of loading the oil from the tank into the tank / tank, the mass data of the released oil or oil is supplied from the fuel dispenser to the input of the interface unit 2. The interface unit 2 converts the data received at the input of the weight of the released oil or oil to the canonical protocol for exchanging data with block 4 and transfers them to the input of block 4 for storage.

At the input of block 4 over the local area network (LAN) of the enterprise, data from the automated accounting system about the completion of the vacation operation is received. The interface unit 1 converts the input data on the results of measuring the mass of oil or oil in the flow tank at the time of completion of vacation to the canonical protocol for exchanging data with block 4 and transfers them to the input of block 4 for storage. The interface unit 3 connects to the BSU of the object into the tank / tank of which oil or oil is dispensed and converts the input data on the results of measuring the mass of oil or oil in the tank / tank at the time the vacation is completed to the canonical data exchange protocol with block 4 and transfers them to the input of block 4 for storage.

The fact of the beginning and end of vacation is recorded by the operator directly in block 4 or is received at the input of block 4 via the enterprise LAN from an automated metering system (ACS) or from an automated process control system (APCS).

Based on the recorded data on the start and end of the vacation, the mass of the oil received in the storage tanks is calculated as the difference between the mass of the oil in the receiving tank registered at the time of completion of the discharge from the transportation tank and the mass of the oil in the receiving tank, also registered at the time of the beginning of the discharge .

Upon completion of the oil or oil production, block 4 performs a comparative analysis of deviations of the measured mass of released oil or oil according to each of the SI used to measure the mass of oil or oil in the process of tempering. If, as a result of the analysis, for any SI deviation is found that exceeds the allowable limit, then for this SI the fact of metrological characteristics exceeding the acceptable values is recorded and the frequency of registration of such facts is checked.

The results of the monitoring and / or recommendations for further actions on the maintenance of technological equipment and SI are displayed on the display of unit 4 with the possibility of printing.

The inventive method is implemented in the Unified Automated Diesel Fuel Accounting System (EACU DT) in the fuel depots of the Krasnoyarsk Railway (15 warehouses), which made it possible to identify and eliminate deviations in the month of metrological characteristics of the four fuel dispensers resulting from a violation of transportation and installation technology, five SI units in tanks and nine BSU installed on diesel locomotives of the assigned park of the Krasnoyarsk railway. The metrological characteristics of the following measuring instruments were monitored:

- Broadcasting Company of type AT, registration number in ГРСИ 54147-13;

- SI of the mass of oil or NP in tanks - UIP-9602 "Gamma", registration number in the SRSI 16553-03;

- BSU type of APK “BORT”, registration number in the industrial register of measuring instruments and test equipment approved for use in JSC Russian Railways MT.019.2009.

When implementing the method used the following values of the control parameters:

- marginal relative error of the fuel dispenser - 0.15%;

- the limiting relative SI error in reservoirs is 0.65% when measuring the mass of oil or NP up to 120 tons and 0.5% when measuring the mass of oil or NP over 120 tons;

- marginal relative error of the BSU - 0.65%;

- the relevance threshold for monitoring the frequency of recording facts of exceeding the permissible value of deviations D _N ≤0.05, that is, no more than one exceeding the permissible deviation by 20 measurements using this SI.

Verification of the fulfillment of the conditions of the described control method was implemented in the EACU DT software. As a result, the application of the described method to control the metrological characteristics of these SI was recorded facts of exceeding the maximum deviations of the measured value of the mass of oil or NP for individual SI in a number of fuel depots. The relevance of the control results was confirmed by indicator D _N. Based on the results of the control, it was decided to conduct an unscheduled verification of SI. Verification confirmed the fact that the maximum deviation was exceeded when measuring the mass of oil or oil (the presence of a systematic error that arose due to an error in the installation of the dispenser, errors in the calibration tables of tanks, incorrect settings of the control system, errors in the calibration tables of diesel locomotives). As a result of the work carried out to eliminate defects in installation, alignment of SI in tanks, calibration of tanks and fuel tanks of diesel locomotives, adjustment of the BSU settings, the systematic component of the error was eliminated, metrological characteristics of SI were brought into line with the description of the type of SI. The control of metrological characteristics, performed within three months after verification and adjustment, showed the absence of exceeding the maximum deviations.

Claims (1)

A method for automatically monitoring the metrological characteristics of measuring instruments (SI) of the mass of oil or liquid petroleum products (NP) on the basis of fuel, including comparing the results of measuring SI, characterized in that before and at the end of each holiday operation, the results of measuring the mass of oil or NP are automatically recorded and performed automatic comparative analysis of the results of measurements of the mass of dispensed oil or NP according to at least three SI data, namely, according to the data of an automatic measurement system in tanks, according to fuel dispensers and according to the data of the automatic measurement system in the receiving capacities and tanks of vehicles with the accumulation of statistics on the facts of exceeding the limiting measurement errors by individual SRs to prepare a conclusion on the possibility of further operation or the need for unscheduled verification of SI, while analyzing the results of three non-equal measurements of the mass released oil or NP apply the method of comparing the measurement results with the determination of the total arithmetic mean, and for each SI, pr named in the holiday operation, compare the actual deviation from the total arithmetic mean with the maximum permissible deviation
| M _i -M _o | ≤ΔM _i , where
M _i - the mass of the released oil or NP according to the i-th measuring instrument;
M _o is the total arithmetic mean of the measurement results;
ΔM _i - the maximum permissible deviation of the result of a single measurement from the total arithmetic mean for the i-th measuring instrument,
in this case, if the condition is not met, then the fact of exceeding the permissible deviation for a given SI is recorded with the computer keeping the date of detection, the absolute and relative value of the deviation of the results of measuring the mass of oil or NP from the calculated estimate of the measured mass of oil or NP, followed by a retrospective relevance analysis SI monitoring results based on the following condition:

where
D _N - a predetermined threshold of relevance of control by the frequency of registration of facts of exceeding the permissible value of deviations;
Z - the number of recorded facts of exceeding the permissible deviation value, since the last SI verification;
Y is the total number of receive operations performed using controlled SI since the last SI verification was performed.

Images