UA34514C2 - method FOR METROLOGICAL DIAGNOSTICS OF MEASUREMENT PIPELINES WITH COMMON OUTLET AND INLET COLLECTORS INCLUDED TO SET OF GAS FLOW RATE METERS - Google Patents

Abstract

The invention relates to measuring equipment. The method is in performing simultaneous measurement of gas flow rate by all the measurement pipelines, with determination of error of flow rate measured for the measurement pipelines, with comparison of error obtained to given value and formation of signal about metrological failure of measurement pipeline..

Description

The invention relates to measuring equipment and can be used for metrological diagnosis of flow meters, which are installed at gas measurement points of main gas pipelines and consist of several measuring pipelines with common inlet and outlet manifolds.

The method closest to the invention is the simultaneous measurement of gas flow through all measuring pipelines, the determination of the error of the measured flow value for the measuring pipelines, the comparison of the obtained error with the specified value and the formation of a signal about the metrological failure of the measuring pipeline in the event that the error received exceeds the set value ||.

This method of metrological diagnosis of measuring pipelines with common inlet and outlet manifolds, which are part of gas flow meters, a multi-channel flow meter that summarizes, as well as the claimed method of metrological diagnosis of flow meters, includes simultaneous measurement of gas flow through all measuring pipelines, defined for measuring pipelines of the error of the measured gas flow, comparing the received error with the specified value and generating a signal about the metrological failure of the measuring pipeline in the event that the received error exceeds the set value. However, the assignment of the error for all channels in the form of the maximum absolute value reduces the reliability of detecting the metrological failure of the measuring pipeline due to the fact that the specific absolute error of the channel is not taken into account and the possibility of measuring the maximum absolute error of a specific channel in the downward direction due to the decrease in the channel capacity over time and due to daily fluctuations gas consumption

The proposed invention is based on the task of improving the method of metrological diagnosis of flowmeters by simplifying it and reducing the time for determining a measuring pipeline that has a metrological failure.

The technical result is achieved by the fact that in the method of metrological diagnosis of measuring pipelines with common input and output manifolds, which are part of gas flow meters, which consists in conducting simultaneous measurement of gas flow along all measuring pipelines, determining the error of the measured flow value for the measuring pipelines, comparing the obtained errors with a set value and the formation of a signal about the metrological failure of the measuring pipeline in the event that the received error exceeds the set value, according to the invention, at pre-set time intervals, a set number of flow measurements are performed on all measuring pipelines to obtain a set of minimum and maximum flow values, which characterizes the scheme of connecting pipelines, take one of the measuring pipelines as the basic one, calculate the current value of the gas flow Ok in all measuring pipelines, except for the basic one, according to the formula: ok - by fate (Octah - Ok tip) 4 Ok tip b tah v tip dec - the number of the measuring pipeline,

And - index of current measurement,

Okhtah - the maximum value of gas flow in the basic measuring pipeline;

Ovtip - the minimum value of gas flow in the basic measuring pipeline;

Octach - the maximum value of gas flow in the k-th measuring pipeline;

Octip - the minimum value of gas flow in the k-th measuring pipeline;

Ogk is the current calculated value of gas flow through the basic measuring pipeline, and the error of the measured value of gas flow for each measuring pipeline is determined by the formula

Ак-|ИОк - ОРкЧ/ОК, where Ок is the current measured value of gas flow in the k-th measuring pipeline.

The proposed method makes it possible to increase the reliability of detecting a metrological failure, since the latter is detected by the relative value of the error, which is determined by the current calculated and measured flow values.

The drawing shows the scheme of the algorithm of the proposed method to explain the work.

The proposed method of metrological diagnosis of measuring pipelines, each of which contains its own pipeline and means of measurement (for example, a measuring diaphragm, pressure and temperature measuring transducers), is implemented in the following way.

At the gas flow measurement point, a preliminary audit of the measuring pipelines and calibration of the measuring instruments is carried out. Flow measuring devices can be of any type. After that, at set time intervals, a specified number of gas flow measurements are performed along all measuring pipelines, the results of which are memorized. The time intervals during which gas flow measurements are performed on all measuring pipelines and their number are selected depending on the measuring tools used at a specific gas flow measurement point. For example, with automatic means of measuring gas consumption (for example, the "Superflow" type), the time interval is chosen equal to 1 hour, and the number of measurements is equal to 20-50. Based on the results of the measurements, a matrix of five values of gas flow is obtained Си, О21, О31,...О0пи, Сн2, 0022, Оз2,...)п2, Оз, Огз,

Ozz8,...Op8,... Ot, St, C)zt,..-.C)pt, DE n - the maximum number of the included measuring pipeline, and t - the specified number of gas flow measurements, which are memorized. From the obtained flow values, select the minimum and maximum gas flow values for each of the included measuring pipelines -

Oimin, Oimax, Ogmin, Ogmax, Ozmin, Ozmax"....O)pmin" Opmax, which are also remembered. The obtained set of minimum and maximum flow values characterizes the established scheme of inclusion of measuring pipelines and is valid until the moment of its change. Further, if it is necessary to carry out diagnostics of the measuring pipelines, one of the measuring pipelines is arbitrarily designated as the basic one and gas flow measurements are carried out in all pipelines. Based on the measured value of gas flow of the basic measuring pipeline for all other measuring pipelines, calculated values of gas flow are calculated according to the formula: ok - vot (Ok tah - Ok tip) 4 Ok tip b tah v tip dec - number of the measuring pipeline,

And - index of current measurement,

Okhtah - the maximum value of gas flow in the basic measuring pipeline;

Ovtip - the minimum value of gas flow in the basic measuring pipeline;

Octach - the maximum value of gas flow in the k-th measuring pipeline;

OKtip - the minimum value of gas flow in the k-th measuring pipeline;

Ogk is the current calculated value of gas flow through the basic measuring pipeline, and the error of the measured value of gas flow for each measuring pipeline is determined by the formula

Ak-|Ok - Ok, where Ok is the current measured gas flow value in the k-th measuring pipeline.

The obtained error value for each measuring pipeline is compared with the specified value and, if the obtained error values do not exceed the specified value, then it is considered that the measuring pipeline is normal according to metrological indicators. If the obtained error exceeds the specified value, then it is considered that a metrological failure has occurred in this pipeline, therefore a signal about a metrological failure of the measuring pipeline is generated and issued. The specified error value, set for each measuring pipeline, is commensurate with the error of the gas flow measuring devices used in this measuring pipeline.

The described method of diagnosis is used with an unchanged scheme of inclusion of measuring pipelines. If a metrological failure is detected, then after its elimination or, if the metrological failure cannot be quickly eliminated, then after disconnection of the faulty measuring pipeline, in order to further diagnose the measuring pipelines by the proposed method, it is necessary to first perform all the actions provided by the method.

Method of metrological diagnostics of flowmeters.

BEGINNING

Revision of measuring pipelines.

Calibration of measuring instruments.

Measurement of gas flow through all measuring pipelines.

Memorization of gas consumption values.

M M

Delay for so long a

Selection of maximum and minimum flow values for each measuring pipeline. 5-1,K-2 "-9,0,.,

On an (O 0, in - -kt - Kota o tah (9; you " ,

Yuri: Oh,

Ak" o

Ki ni t t

Signaling about the metropogic and failure of the K-th measuring no sec" pipeline. Yes

Entrance

M. the current number of cost measurement on measurement channels during data collection. 2. set time interval for data collection.

Mad. - the specified number of measurements during data collection. 9- index of the basic measuring pipeline (set, for example, equal to "13

K- number of the measuring pipeline,

Ktah - the largest number of the included gas measuring pipeline. where-. error of the K-th measuring pipeline. the established error of the K-th measuring pipeline is blowing.

Circulation of 50 copies.

Open joint-stock company "Patent"

Ukraine, 88000, Uzhgorod, str. Gagarina, 101 (03122) 3-72 -89 (03122)2-57- 03