The aim of the paper is to inform on verification, advantages and limitations of the real time systems installed at the dispatcher center of one of the leading gas transporters. (The annual transport volume is more than 90 billion cubic meters.) Among our main objectives is by means of real-time systems to compensate frequent steep changes in gas delivery from Ukraine (former Soviet Union) to be a reliable and stabilizing member of the global gas transport system. Well-known west and east European producers developed the cores of the applied software systems. Firstly, there was a standard quickly computing non-stationary system. It was useful when we needed to compute some missing SCADA measurements and filter faulty ones. After addition of missing sensors and doubling of pressure sensors the requirements were changed. Comparison of calculation results with SCADA database and experimental real-time measurements showed that it would be beneficial to further expand accuracy in transient environment as well as to include algorithms for transient optimization. The recently installed software for transient optimization so far has not been implemented for the whole system. Although it is really accurate with deviation around 3 % from real data, calculations are rather time consuming in viewpoint of dispatcher. Therefore, currently the software is used just for the highly accurate non-stationary nonisothermal forecast of SPP-DSTG pipeline system behavior. Another really important application of this software is numerical analysis of processes in branched pipeline section. It deserves a special focus because corroded pipelines frequently cross inhabited areas. By highly accurate real-time gas leak detection and localization the software will decrease potential harmful influence on inhabitants and environment.

Section 1. Description of simulation object

Typical gas transportation facility combines some gas compressor stations (CS), connected with each other by multiline linear segments of main gas pipelines (LSMP) consisting of some parallel-laid pipes (lines) with big diameter [3]. Length of LSMP between adjoining CS can change from some tens to hundreds kilometers. Working pressure equals to 4,5÷8,0MPa as a rule. LSMP is laid underground, on the ground, aboveground or in water (at passages through the water barriers). CS consists of one or some compressor shops (CSh). A group of gas compressor units (GCU) is installed in compressor shop. These GCU are equipped with centrifugal supercharger. Connection of GCU in compressor shops and connection of compressor shops between each other is realized with the help of single-line high pressure pipeline system. These pipelines are called as the technological gas pipelines (TP). As a rule the length of TP doesn't exceed one - two thousands meters. Dust catchers are used at CS for treating of natural gas (incoming in centrifugal supercharger) from solid and liquid impurity elements; air-cooling apparatus (ACA) are used at CS for natural gas cooling.

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