Abstract
Analysis of failures of gas pumping units (GPU) installed on the Urengoy-Pomary-Uzhhorod transcontinental gas pipeline showed that failures of automatic control systems of automatic gas pumping units occupy the second place (up to 40 %) of the total number of failures. It is shown that the well-known methods for monitoring the technical condition of the mechanical part of a gas pumping unit can’t be used to control the operability of automatic control systems and automatic gas control unit components. Among the well-known methods for monitoring the operability of automatic control systems of a gas pumping unit as a dynamic system, the most promising methods are those based on the analysis of its transient process (accelerating characteristic) with some typical input exposure.The theoretical justification of the developed method for monitoring the performance of the automatic control system of the gas pumping unit is presented, the diagnostic feature of which is the value of the areas of accelerating characteristics. The structure of the transfer function and its parameters were determined by the area method (Simoiu method). To implement the method in MatLab, software was developed that allows one to determine the parameters of the transfer function from the experimental start-up curve of the gas pumping unit and the size of the area limited by its transient function.The technique of experimental studies of the proposed method for monitoring the efficiency of the automatic control system of a gas pumping unit type GTK-25i example is given. Further implementation of the proposed method requires determining the conditions of its operability and parallel monitoring of the technical condition of the mechanical units of the gas pumping unit in order to exclude their influence on the result of monitoring the state of the automatic control unit of the gas pumping unit
Highlights
The gas transmission system of Ukraine (GTS) is one of the largest in the world both in terms of length and volume of gas transit
The analysis of defects in the main units of the gas pumping unit during operation showed that the main part of emergency stops and forced downtime associated with defects in mechanical equipment
The purpose of the analysis is to identify diagnostic signs of its technical condition
Summary
The gas transmission system of Ukraine (GTS) is one of the largest in the world both in terms of length and volume of gas transit. The long period of their operation revealed a number of shortcomings and miscalculations, the number of which increased due to the physical and moral aging of the hardware and software of automatic control systems All this led to malfunctions in their work and, as a result, to false emergency stops of the gas pumping unit and compressor station. Surveys of automatic control systems at the compressor stations operating on the main export gas pipelines showed [2] that they are physically and morally obsolete, have worked out their passport resources twice and require immediate replacement Such a replacement of automatic control systems for gas pumping units requires significant financial costs (for example, in 2004 the cost of one automatic control system was 4 million UAH), and temporary – it lasts at least a year on shut-down technological equipment. The solution to this problem will allow for repair work on their actual technical condition and will ensure the reliability and efficiency of the GPU and their automatic control systems
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