Unsteady processes of isothermal natural gas flow, emerging in a long pipeline when there is switching-over from one stationary process to another process, have been considered this paper.The one-dimensional system dynamics equations used for that purpose.It includes conservation mass and momentum written relative dimensionless flow densities.Three boundary-value problems formulated define three models control the transient processes.The differ by boundary (control) functions imposed at ends...

A mathematical model for propagation of a small disturbance in the moving gas long pipeline has been built paper.The contains two coupled equations, coefficients which are expressed via parameters initial process mass density and flow rate.In frame model, influence stationary on pulses initiated by local fluctuation, originated stream, was studied numerically.The developed can be used quantitative analysis oscillations operational regimes long-distance pipeline, caused random stream...

It has been shown that in the conditions of aggravation ecological problems, shortage high-quality raw materials for production Portland cement clinker a promising direction industry development is more extensive waste utilization as well low energy consuming and modified composite cements, characterized by high content active mineral additives.The use cements both mortars concretes provides their quality durability great social benefit terms resources preservation, saving, environmental...

The object of research is the management system gas transmission (GTS) Ukraine. analysis shows that GTS effectiveness hampered by information heterogeneity available automation means and lack automated data exchange on vertical «process control – strategic management». study applied methodology proposed ANSI/ISA-95 standard, reference model functional hierarchy manufacturing enterprises.As a result research, functions processes acting at operational level, are determined. An approach to...

A telegraph-type equation, which describes in some approximation propagation of small pressure disturbances moving gas long pipeline, has been considered. The Cauchy problem for it solved quadratures with the use Riemann method.

Direct and inverse problems for leak identification in long distance gas pipelines stationary operational modes on the base of data obtained by pressure monitoring pipeline’s inlet, outlet several intermediate check points have been formulated. Algorithms solving formulated developed their numerical study has done. On this basis methods detecting, its intensity location determination with use suggested. Quantitative evaluation precisions proposed conducted.

A mathematical model for mass and momentum transfer in a long gas pipeline under its depressurization has been constructed. Nonlinear problems transient processes the local have formulated. With use of finite difference method, nonstationary distributions pressure flow rate studied various regimes compressors operation. The obtained results can be used modeling gas-dynamic main pipelines during their accidental depressurization, forecasting possible losses, decision making on how to cure...

A problem of gas balance analysis in the transportation system objects and factors influence on accuracy its installation are considered.It is shown that calculation individual indicators can be effectively solved.For this purpose, invariants mathematical model flow used.The carried out computational experiments have confirmed sufficient suggested approach.

The object of this study is underground gas storage facilities (UGSF). main problem being solved to ensure effective management the operation process (UGSF) at operational and forecast time intervals. One factors that affect operating modes UGSF significantly non-stationary filtration processes take place in bottomhole zones wells. complexity assessing multifactorial impact on depression/repression around wells affects both speed accuracy calculating mode parameters operation. Analysis...

The paper analyzes the existing methods for leak detection and monitoring main gas pipeline sections. An extended classification of is presented based on additional parameters: operating mode (steady-state, non-steady-state) type (presence detection, location identification, volume determination). Based comparative analysis according to criteria sensitivity, reliability, localization accuracy, response time, implementation cost, negative pressure wave method with an real-time modeling system...

The object of this study is underground gas storage facilities (UGSF) as part the transmission system (GTS), in process joint operation which a significant synergistic effect achieved. problem under consideration to ensure effective integrated UGSF and GTS complex single thermal-hydraulic one. A method daily calculation maximum productivity has been devised. optimization potential operating modes studied. It shown range within 11‒20 %. problems planning have stated solved both pumping...

У статті розглядається варіант поетапної автоматизації управління газотранспортною системою України з використанням методології, визначеної стандартом ANSI/ISA-95, та сучасних методів цілісністю трубопроводів