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| Transportation, storage, pipelines |
17.05.08, Yu.Yu. Fyodorov, A.V. Savvina
STRESS-STRAIN PROPERTIES OF UNDERGRAUND GAS PIPELINES UNDER THE CONDITIONS OF THE PERMAFROST
http://www.ogbus.ru/authors/Fyodorov/Fyodorov_1.pdf (in Russian)
Forecasting of stress-strain state of underground polyethylene gas pipeline under the conditions of the permafrost is carried out. The results of the analysis of the pipe bending stresses caused by ununiforn swelling of grounds. Account for existence of satisfactory strength of the material. It was shown that long-term influence of bending stress together with viscoelastic properties of the material at real operation temperature in the course of time decreases stresses occurring in it.
The investigation is supports by RFBR, project ¹03-01-96018.
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28.12.07, Kh.M. Hamzayev
SOME PROBLEMS OF PIPELINE TRANSPORT OIL AND OIL PRODUCTS
http://www.ogbus.ru/authors/Hamzayev/Hamzayev_1.pdf (in Russian)
Work is devoted to research of some questions of pipeline transport of oil and oil products. In the first part of work the problem of a choice of an operating mode of the pump station located on the set site of the pipeline is considered, and in the second part the problem of detection of outflow of oil and oil products in pipelines is investigated.
For the mathematical description of problems the one-dimensional mathematical model of stationary movement of a viscous liquid on the pipeline is used. Thus pressure and the mass charge of a liquid in initial and final sections of the pipeline are considered set. The analytical method of the decision of tasks in view is offered and obvious formulas for definition of an operating mode of pump station, the mass charge on outflow and places of outflow in the pipeline are received.
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20.11.07, N.P. Starostin, A.I. Gerasimov, N.A. Belchusova, O.A. Ammosova
THE INFLUENCE OF LOW AIR TEMPERATURES ON THE CRYSTALLINITY OF THE WELDED JOINT MATERIAL OF THE PIPELINE FROM POLYETHYLENE PIPES
http://www.ogbus.ru/authors/Starostin/Starostin_1.pdf (in Russian)
The method of calculating the time of the action of the heating instrument at welding the gas pipeline from the polyethylene pipes at air temperatures being lower than the regulated ones is suggested on the basis of mathematical simulation of the heat process. The degree of the crystallinity of the welded joint materials obtained during cooling in the natural conditions of low temperatures is investigated.
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10.10.07, D.A. Babichev, M.Y. Zemenkova
INCREASING OF EFFICIENCY AND SAFENESS OF HYDROCARBON FLUIDS TANK STORAGE BY MEANS OF FLEXIBLE CIRCULAR SHELLS
http://www.ogbus.ru/authors/Babichev/Babichev_1.pdf (in Russian)
The current article deals with research of capability of crude oil storing in flexible shell tanks of great volume. Fundamental construction of variable volume tank with soft polymer shell was brought forward. Finite-element mathematical and computational models of flexible circular shell, permitting to define its shape and tension were developed.
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12.09.07, S.M. Dudin, Yu.D. Zemenkov
MATHEMATICAL AND THE SUPPLY WITH INFORMATION OF MONITORING OF HYDRODYNAMICAL CHARACTERISTICS OF HYDROCARBONIC ENVIRONMENTS IN PIPELINES
http://www.ogbus.ru/authors/Dudin/Dudin_1.pdf (in Russian)
In work problems of pipeline transport of multiphase environments are considered, prominent features of hydrodynamical processes are described, the general preconditions for modelling movement of multiphase systems in pipes are resulted, the model of current of multiphase environments in pipelines is considered generalized physical and mathematical, the method of gathering and processing of the information on a condition of process of swapping is described, etc.
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11.09.07, Astvatsatur'yan R.E., Kocharyan E.V.
MODELLING OF MOVEMENT OF GAS IN GAS MAINS IN VIEW OF FORCES OF INERTIA OF A STREAM
http://www.ogbus.ru/authors/Astvatsatur'yan/Astvatsatur'yan_1.pdf (in Russian)
The new approached model of movement of gas in the pipelines is developed, allowing to expect processes of non-stationary current of gas in gas mains in view of inertia of a stream. Comparison of results of calculations on the given model with the exact analytical decision initial linearized systems of the equations of transport of gas is lead.
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20.08.07, A.V. Grunvald
USAGE METHANOL IN THE GAS INDUSTRY AS AN INHIBITOR OF HYDRATE FORMATION AND FORECAST OF ITS CONSUMPTION IN THE PERIOD UNTIL 2030
http://www.ogbus.ru/authors/Grunvald/Grunvald_1.pdf (in Russian)
In operating procedures such as upstream, gas treatment and transfer, hard gas hydrates lead to serious problems based on the processes abnormality.
Traditional and main method of hydrate formation prevention in gas industry is usage of hydrate inhibitor - methanol.
Specific dispensable rates of methanol consumption as an inhibitor of hydrate formation depend directly on the composition of the extracted natural gas and also technology of preparing the natural gas to the transportation. The article contains the detailed examination of this dependence and also the forecast of methanol consumption in the gas industry in the period until 2030.
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13.07.07, M.V. Semukhin
INTERACTION OF MULTILEVEL MODELS DURING OPTIMIZATION OF OPERATING CONDITIONS OF A NETWORKED INTERFIELD GATHERING LINE
http://www.ogbus.ru/authors/Semukhin/Semukhin_2.pdf (in Russian)
The throughput optimization or output pressure maximization algorithm includes three-level characterization models: i.e. original characterization in a form of a system of nonlinear algebraic equations; linearized characterization vs. unknown costs and pressure squares; and solution of a linear programming task at each step of iteration. Given that a gathering line structure is complex and large, the 4th level of characterization in a form of "black box" model with a sensitivity function may be introduced before running linear programming.
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11.07.07, M.V. Semukhin
MULTILEVEL SYSTEM OF MODELS TO COMPUTE OPERATING CONDITIONS OF NETWORKED INTERFIELD GATHERING LINE AND GAS COLLECTING SYSTEMS
http://www.ogbus.ru/authors/Semukhin/Semukhin_1.pdf (in Russian)
A three-level gas production system that helps to collect, treat and perform interfield transport of the gas produced is assumed. The basic algorithm to compute operational conditions of a networked interfield gathering line and gas collecting systems includes two-level characterization models: i.e. original characterization in a form of nonlinear algebraic equations; and linearized characterization vs. unknown costs and pressure squares or as a simplified tree-type structure.
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02.07.07, V. Agapchev, M. Fattakhov
CALCULATION OF HYDRAUDYNAMIC PARAMETERS OF PIPELINES REPAIRED WITHOUT TRENCHING USING POLYETHYLEN PIPES
http://www.ogbus.ru/eng/authors/Agapchev/Agapchev_3.pdf
The paper describes features of hydraulic frictions calculation for pipelines repaired using polyethylene pipes. Effective formulas are given to determine the hydraulic friction coefficient for various zones of fluid flow in a pipeline.
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29.05.07, Sajjad Mubin, U.A. Goryainov
CONSTRUCTION AND OPERATION OF PIPELINE PROJECTS IN PAKISTAN - ASSOCIATED RISKS AND THEIR SOLUTION
http://www.ogbus.ru/eng/authors/Mubin/Mubin_1.pdf
Looking its high energy demand, Pakistan is planning to import natural gas through pipelines from neighboring countries. For fully utilizing the imported gas, providing it to end customers, the infrastructure of gas pipeline is being developed. Therefore a huge investment is being carried out in this sector. During the last 10 years the network of main and distribution gas pipeline has been expanded by 85%. But the geological and geographical conditions of Pakistan are tough for the construction. On one side there are glaciers and high mountains, on the other side there is desert and plan of river Indus with extensive network of wide rivers and canals. There is always risk of earthquake, landslides and floods. Instable Government policies, high rate of inflation, rapid change in material prices are also important risk factors. Looking the current geopolitics situation there is a persistent threat of war and terrorism in the country. All these factors make the situation very complex in quantifying the risk factors especially when the project is gas pipeline in which the impact factor of risk exponentially rise in case of risk occurrence. Moreover, due to the absence of modern project or risk management techniques and methodologies the projects are usually not completed in their planned time or budget. Effort has been made to quantify the associated risks of gas pipeline project on the basis of historical data. The research will be helpful to separate the most important risks from the trivial many for the construction of any sort of pipeline project in the northern areas of Pakistan.
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13.03.07, R.O. Samsonov
GEOECOLOGICAL RISK MANAGEMENT BY OPTIMIZING THE COMPRESSOR PLANT OPERATION AT THE NATURAL GAS MAIN PIPELINES
http://www.ogbus.ru/eng/authors/SamsonovRO/SamsonovRO_2e.pdf
http://www.ogbus.ru/authors/SamsonovRO/SamsonovRO_2.pdf (in Russian)
The approaches for optimizing the ecological risk management in the impact areas of compressor stations of natural gas main pipelines are considered based on the minimization of energy consumption. The relevant mathematical models for the given optimization task are suggested. As a pilot project the main pipeline "Central Asia - Center" is selected aimed the increasing gas transport and reconstruction. The emission optimization calculation and critical loads for emitted pollutants on the impacted ecosystems are carried out. The economical speculations are suggested to include the preventive ecological damage.
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12.03.07, A.S. Kazak, R.O. Samsonov
THE SYSTEM ANALYSIS IN TASKS AIMED AT MINIMIZATION OF GEOECOLOGICAL RISKS AT COMPLEX GAS MAIN PIPELINES
http://www.ogbus.ru/eng/authors/Kazak/Kazak_1e.pdf
http://www.ogbus.ru/authors/Kazak/Kazak_1.pdf (in Russian)
The methodology of application of the system analysis and the relevant mathematical models for optimization of gas flows in complex gas transportation systems (GTS) are considered taking into account the gas pipelines emissions' environmental impact. The proposed approach allows the researcher to estimate the level of geoecological risks at separate sections of pipelines and rank the GTS subsystems by this index. In turn, it permits to single out the pipeline sections sets, where the management solutions and measure have to be undertaken in order to decrease the level of geoecological risks. The stage of the system synthesis envisages the possibility of the geoecological risk assessment during operation of the whole system.
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01.03.07, R.O. Samsonov
MODERN PRINCIPLES OF FORMING AND DEVELOPING THE NATURAL GAS PIPELINE SET OF THE RUSSIAN FEDERATION
http://www.ogbus.ru/eng/authors/SamsonovRO/SamsonovRO_1e.pdf
http://www.ogbus.ru/authors/SamsonovRO/SamsonovRO_1.pdf (in Russian)
The principles and basic concept are considered to carry out the expert system for facilitating the creation and assessment of various adequate scenarios for strategic development of gas industry in Russia.
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18.11.06, T.I. Lapteva
SIMULATION OF LEAK FORMATION PROCESSES AND LEAK DETECTION IN PIPELINE
http://www.ogbus.ru/authors/Lapteva/Lapteva_2.pdf (in Russian)
The paper describes leak formation molds and criteria of their detections. Simple cases of formation only pressure jump and velocity jump are described and are researched.
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23.08.06, S. Pavlov, V. Pavlov, S. Plekhanov, O. Saubanov
USE OF THE GIS OF THE PIPELINE COMPANY FOR PRESENTATION OF INPIPE DIAGNOSTIC RESULTS
http://www.ogbus.ru/authors/Pavlov/Pavlov_1.pdf (in Russian)
The article describes application of geoinformation system for presentation of the inpipe diagnostic results for pipeline maintenance works support. Cooperation of the GIS with the diagnostic system and data processing algorithm are depicted.
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23.06.06, L. Latyshev, Z. Nasyrova
DETECTION SYSTEM OF ILLEGAL PENETRATION INTO A PIPELINE
http://www.ogbus.ru/authors/Latyshev/Latyshev_1.pdf (in Russian)
The aim of this work is the development of a detection system of illegal penetration into a pipeline, which is included in existing pipeline telecontrol system. Comparative analysis of existing methods of leak detection was done. And it showed that these methods are not efficient for detection of illegal penetration, because they are short time and have a small volume of leak. In this case, application of method, described in this work, is a rather efficient. This method is based on measuring and analysis of acoustic waves in pipeline metal, which arise during the attempt of penetration. The structure of measuring devices for realization of this method was selected with the help of the invariation theory in measuring technics. Application of this theory allows to eliminate the dependence of measuring result on extraneous factors. Using the multichannel principle - the main principle of the invariation theory - proportions for determination of approximate place of penetration by a chosen structure of measuring device were found. Besides, the algorithms and the programs were created for realization of this method.
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25.04.06, A.V. Valyushok, A.G. Gareyev, I.G. Blinov, A.A. Nasreyev
CLASSIFICATION OF OIL-AND-GAS PIPELINE SECTORS EXPOSED TO ELECTROCHEMICAL CORROSION WHEN EXPLOITED
http://www.ogbus.ru/authors/Valyushok/Valyushok_1.pdf (in Russian)
The oil-and-gas pipeline classification existing in industrial protection sphere is based on the unit danger class, which is dependent on such factors as the transported product type, the pipeline diameter and its working pressure, its remoteness from the nearest settlement and also the pipeline construction and laying conditions.
Long distance underground pipeline failure statistics show that every third failure is caused by electrochemical corrosion the influence of which is underestimated when the potential danger of the unit is defined. In connection with this the authors put forward a complex approach to the definition of the pipeline sectors danger that takes into consideration the main factors decreasing the underground oil-and-gas pipeline exploitation safety.
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17.04.06, R.N. Karimov, V.V. Mochalov, A.A. Reyter
THE ANALYSIS OF THE TECHNICAL INCIDENCES STREAM IN THE GAS DISTRIBUTION SYSTEM
http://www.ogbus.ru/authors/KarimovRN/KarimovRN_1.pdf (in Russian)
This article is the fist stage of analysis of determines the quantitative indicators of gas distribution system maintenance. The goal of this work is to analyze and model the time series of technical incidence with city gas equipment. Authors carry out analysis with such modern mathematical and statistical methods as wavelets and singular spectrum analysis. The investigated time series was modeled by the sum of seasonal and trend - cyclic components and the stationery stochastic process.
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21.02.06, V. Ayduganov, L. Volkova, T. Lapteva
EXPERIENCE OF CONSTRUCTION AND OPERATION PIPELINES FROM METAL-PLASTIC TUBES
http://www.ogbus.ru/authors/Ajduganov/Ajduganov_1.pdf (in Russian)
This paper describes questions of new technology, equipment application in the field of construction oil-field pipelines from lined polyethylene steel tubes with one-piece quick union. Practical experience of metal-plastic tubes use produces in fields of gas-and-oil producing companies.
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26.01.05, R.A. Harisov, A.R. Habirova, F.M. Mustafin, R.A. Habirov
THE MAIN REASONS OF ORIGIN OF ISOLATING COATINGS DEFECTS
http://www.ogbus.ru/authors/Harisov/Harisov_2.pdf (in Russian)
In the article analysis of the basic reasons of origin of isolating coatings defects is carried out. The main reasons are:
- application of poor-quality or inappropriate isolating materials;
- poor-quality drawing of primer onto a pipeline;
- defects arising at drawing of polymeric isolating tapes;
- defects arising at isolating and stringing works and backfilling of a pipeline;
- mechanical influences of ground during operation resulting in shearing or stretching stresses in isolating coatings, followed by stress cracking and formation of corrugations, scorings, scratches and flutes;
- physicochemical influence of ground, influence of surface active components of ground colloidal environment resulting in evaporation and washing away of plasticizing agents from isolating coatings;
- misuse of a pipeline (sharp temperature difference of product transported, pumping of a product with temperature above the designed one, etc.);
- poor quality of electrochemical protection measures (the potential difference "pipe - ground" is higher or lower than the admitted one, etc.);
- non-adherence to the modes of isolating materials drawing in winter conditions - disturbance of the modes of pipeline preheating, primer drawing, isolating coatings drawing and storage;
- freezing of pipeline isolating coating together with water saturated ground.
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21.01.05, R.A. Harisov, A.R. Habirova, F.M. Mustafin, R.A. Habirov
UP-TO-DAY STATE OF PIPELINES CORROSION PROTECTION WITH POLYMERIC COATINGS
http://www.ogbus.ru/authors/Harisov/Harisov_1.pdf (in Russian)
Modern condition of pipelines protection from corrosion with help of polymeric coatings is analyzed. It is marked that the technology of pipelines protection from corrosion by polymeric coatings is being improved because main oil and gas pipelines are expensive and metal-intensive constructions, therefore polymeric coatings more than years should planned for the work during all the useful life of apipeline – 35 years and more.
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17.09.04, A. Trofimov, V. Kutsev, E. Kocherian
NON-ISOTHERMAL MODEL OF GAS TRANSPORTATION
http://www.ogbus.ru/authors/Trofimov/Trofimov_2.pdf (in Russian)
New approach of the analytical decision linear systems of the unsteady & non-isothermal equations describing processes of transport of gas in the pipeline is offered in work. Calculation of non-isothermal mode for an operating natural gas pipeline is resulted.
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28.05.03, Garris N., Garris Yu.
DYNAMIC CHARACTERISTIC APPLICATION IN OPERATING CONDITIONS CALCULATION OF MAIN NON-ISOTHERMAL OIL-PRODUCT PIPELINES
http://www.ogbus.com/eng/authors/Garris/Garris_3e.pdf
The calculation algorithm is represented in an integral form. The pipeline dynamic characteristic is defined as a set of combined characteristic of the pumps, plot of the required pump head, a grid of instant characteristics drawn with temperature or viscosity pitches, and additional temperature curves as well. The method of dynamic characteristics enables the change of pipeline hydraulic resistance, it can be used for any flow model fluids, it has been approved in operating main and industrial pipelines, having the software.
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07.04.03, Kutukov S.E., Bakhtizin R.N., Shammazov A.M.
GAS CONGESTION INFLUENCE ON PIPELINE SYSTEM CURVE
http://www.ogbus.ru/eng/authors/Kutukov/Kutukov_7e.pdf
Gas-air congestion is one of the typical operational mode deviations in pumping of oil and petroleum, which reduces the pipeline system capacity on an average 30:60%. The development of measures for pipeline capacity support on designed level is faced up a crucial problem of parametric diagnostic system for hilly terrain pipelines.
The qualitative and quantitative estimation methodology of possible capacity reduction for a pipeline section with gas congestion is suggested. Monitoring of pressure distribution along pipeline length allows revealing and observing their accumulation and migration in time.
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24.03.03, Kutukov S.E., Bakhtizin R.N.
HYDRODYNAMIC PRECONDITIONS OF GAS CONGESTION IN LIQUID PIPELINE
http://www.ogbus.ru/eng/authors/Kutukov/Kutukov_5e.pdf
Hydrodynamic preconditions of existence and migration of gases congestion are discussed. Hydrodynamic model of stratified flow in a hilly terrain pipeline is suggested, that allows to predict the possible location of gas congestions in the pipeline from engineering point of view. There is shown an influence of terrain features on pipeline capacity as a physical pattern in the paper.
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28.03.2002, Ismagilov I., Garris N., Asadullin M., Askarov R.
IMPULSE TEMPERATURE INFLUENCE ON STRESS-CORROSION CRACKING OF BIG-DIAMETER GAS MAINS
http://www.ogbus.com/eng/authors/Garris/gar_e.pdf
After solving the inverse task of heat conductivity on the basis of processed temperature fields of the initial part of 1420 mm gas pipeline Polyana-Moskovo the results were obtained that establish the fact of heat conductivity and ground humidity change not only along the pipe contour but in the course of time as well. During continuous observations impulse humidity change (1,5…2 times and more) in the zone of pipeline outer surface contact with the ground was fixed synchronous to the temperature change of the gas flow.
Based on the researches made it is possible to conclude that impulse change of pipe wall temperature causes synchronous change of the adjoining ground temperature and humidity. This fact may be regarded as the impellent that activates electrochemical corrosion and bio-corrosion. This phenomenon reveals itself in discrete stress cracking of metal and in the direction of maximum development of stress.
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11.12.2001, R. Nabiev, I. Budilov, R. Nasyrov
EVALUATION OF STRENGTH OF OIL PIPELINES WITH DEFECTS TAKEN INTO CONSIDERATION
http://www.ogbus.com/eng/authors/Budilov/evaluation.pdf
Damages of oil pipeline’s sections during the maintenance put it often out of operation or cause temporary stops, which as the result involves considerable financial costs. Therefore, the elaboration of efficient methods is an actual task for the estimation of possible consequences of damages and destructions of some sections and oil pipeline as a whole taking into account real defects. Such estimation requires a fulfillment of complex research works, both of destruction mechanisms and kinetics of growth of weary defects and cracks
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11.12.2001, S.Å.Êutukov
Heat exchange of pipelines in the severe geo- cryological and hydrological ambient under macroclimatic and seasonal conditions
http://www.ogbus.com/eng/authors/Kutukov/heat.pdf
The heat&mass transfer of a transported product with embracing environment is a complex composite process, on which the determinate and statistical models for a omnifarious technological problem solutions of pipeline operating are created.
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11.12.2001, R. Zaripov, G. Korobkov, R. Khasanov, V. Chichelov
MAINTENANCE OF STRENGTH OF MAIN PIPELINES, OPERATING IN NON-STANDARD CONDITIONS
http://www.ogbus.com/eng/authors/Zaripov/mainofstrength.pdf
A mathematical model of a stressed-deformed condition of the pipeline having big sagging, commensurable with the pipe radius is proposed. A non-linear statement of the task of a bar’s long-cross bend (a pipeline model) allow to take into consideration real conditions of the pipelines’ maintenance, laid in areas with watered, ever-frozen and landslide grounds as well as with sub-surfaced cavity of various origin. Initial equations, an algorithm of their decision are given, as well as an example of the research of a stressed-deformed condition of a gas pipeline, passing over karst formations, under operational and weather-climatic loads.
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11.12.2001, Y. Spector, O. Denisov, A. Shchepetov, V. Alexandrov, A. Gruzdev
STEEL TANK UNDERLAY REHABILITATION IN ACCORDING TO THE TECHNICAL INSPECTION
http://www.ogbus.com/eng/authors/Spector/steeltank.pdf
For oil and oil products storage tank batteries are equipped with the vertical cylindrical steel tanks with the volume capacity up to 50 thousand m3. The tanks are the complicated engineering constructions, extremely sensitive to the differential settlements of soil bases which provoke lack of parallelism, rakes and a tank form change. When a tank hydraulic testing, the differential settlements and rakes often occur that exceed the standard values. Tank bases and pads evaluation includes settlement determination, engineering- geological survey, technical state inspection. According to the evaluation results, the conclusion on the possibility of the subsequent tank service and, if necessary, the recommendations on repair and reconstruction of the base are given. The main methods of a tank base repair and reconstruction are soil stabilisation, pads strengthening, penetration of piles of different construction.
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11.12.2001, S. Kutukov, R. Bakhtizin, R. Nabiev, S. Pavlov, A.Vasiliev
SIMULATION METHOD OF PIPELINE SECTIONS RANKING BY ENVIRONMENMTAL HAZARD DUE TO OIL DAMAGE SPILL
http://www.ogbus.com/eng/authors/Nabiev/simulation.pdf
Geoinformation modelling serves as a methodological basis for development of means for prognosis of environmental and social consequences of accidents at trunk pipelines. One of numerous aspects of this problem is fragmentation of a pipeline into linear objects by environmental characteristics including technical state and probable environmental and social consequences of an accident. Rational planning of the pipeline linear section overhauls, declaration of industrial and environmental safety, development of valid standards for the pump station emergency service and other aspects depend on the correct solution of these problems. When making management decisions under the conditions of uncertainty or limited initial information a comparative assessment (ranks) of probable accident consequences at these pipeline sections should become an effective means for determining the required reliability level of a trunk pipeline section.
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11.12.2001, A. Shammazov, B. Mastobayev, A. Lokshin, R. Bakhtizin, R. Bikmetov
MAINTENANCE OF OPENED RESERVOIRS OF OIL PUMPING STATIONS OF MAIN OIL PIPELINES
http://www.ogbus.com/eng/authors/Lokshin/maintenance.pdf
Based on the fulfilled research works, the fact of the existence of the opened reservoirs in the system of oil transport and storage is examined, their purpose and influence on the surrounding objects. Physical and chemical properties of oil products, existing in the opened reservoirs were considered.
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11.12.2001, S. Kutukov, F. Badikov, G. Samigullin
APPLICATION OF INTELLECTUAL SYSTEMS IN MONITORING OF OIL PIPELINES OPERATION MODES
http://www.ogbus.com/eng/authors/Kutukov/applicationofint.pdf
The application of expert systems in monitoring of trunk oil pipelines operation modes increases considerably a reliability of the maintenance, due-time control, reduces costs for technical service due to the descent to the mode of “repair as per condition”, enlarges possibilities of ecology monitoring and technical genetics.
On the analytical basis of the up-to date technical pipeline diagnostics achievements, the methodology of the system’s “training” based on the configuration (architecture) of multi-layer network is shown in this paper, allowing to describe adequately system’s behaving standards, and perspectives of the informative system application are outlined. The quantitative estimation algorithm of the functional deviation (passage contraction of offshore oil-field “White Tiger” collector identified by the Delphi technique) is explained by graphic analogues.
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11.12.2001, Khafizov A., Chebotarev V., Dudov A., Besprozvannj A., Umergalin T.
RESOURCE SAVING TECHNOLOGY WITH THE COLLECTION, PREPARATION AND STORAGE HYDROCARBON RAW MATERIAL
http://www.ogbus.com/eng/authors/Khafizov/resourcesaving.pdf
Herein the problems of reduction of technological losses hydrocarbon of raw materials and reagent at oil producing the enterprises are considered. The new technologies applied to the solution of this problem are analyzed. As the basic idea the technologies based on the processes momentary adsorbtion and disorbtion are offered, and it is offered to use pipelines as technological devices for absorption of petrol fractions from petroleum and natural gas, preliminary drainage of natural gas in dilatable chambers and gas pipelines, disorbtion of a sated watermethanol solution by a warm gas.
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11.12.2001, A. Gumerov, G. Zhuravlev, S. Rafikov, E.Gorbanenko
THE ESTIMATION OF TECHNICAL STATE OF MARINE PIPELINES
http://www.ogbus.com/eng/authors/Gumerov/estimation.pdf
Procedures of calculation of stress-deformation state of the most hazardous submarine pipeline sections are considered, an example of the calculation is given.
In the oil fields under development in the shelf of Vietnam marine pipelines for offshore pumping of high- solidification oils, gas-liquid mixtures, gas and water to maintain formation pressure are in operation. The constructive design of pipelines is performed without sea bottom penetration.
As is shown by the world practice, the main causes of failures of such pipelines in operation can be damage from ship anchors, internal and external corrosion of pipes, excessive bends in vertical and horizontal planes, wear of pipelines at the intersection points, damage resulting from metal fatigue caused by waves, currents, changes in pressure and temperature of a product being pumped, bottom deformation and sagging of pipelines, damage caused by construction work in the immediate proximity to pipelines.
To ensure reliable and trouble-free operation of marine pipelines and to make a timely decision regarding time and type of repair one should possess true information about technical condition of these pipelines. In case of impossibility of using traditional methods of checking required parameters, applied for pipelines laid on the ground, it becomes necessary to develop and to update the procedures of obtaining such parameters by theoretical methods.
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11.12.2001, J. Faitli
PRESSURE LOSS CALCULATION MODEL FOR WELL-GRADED SOLID-LIQUID PIPE FLOWS ON THE BASIS OF SYSTEMATIC PILOT PLANT INVESTIGATIONS
http://www.ogbus.com/eng/authors/Faitli/pressureloss.pdf
If a well granulated bulk solid material is separated into narrow particle fractions by size and the pressure loss curve of each fraction is measured in a given pipe a limit particle size can be determined.
The flow of the smaller fractions and the water can be described as a continuum with own suspension density and rheological properties. This is called fine suspension flow. The pressure loss curve of the coarse fractions and water flow has a minimum point, the continuum model is hard to be applied. This is called coarse mixture flow. In a given pipe only the particle size determines whether the flow is fine suspension or coarse mixture. In case of a coarse mixture flow the particles can be suspended or settled as function of the actual flow rate. When the coarse particles are suspended, this is the case of the many empirical equations, of which the first one was proposed by Durand. Mechanical friction loss of the settled and sliding particles can be correlated by the two-layer model.
On the basis of this point of view a pressure loss calculation method has been developed. The material parameters in the model can be measured by a systematic test by a tube viscometer. A hydraulic test loop and a tube viscometer with three different pipes have been built and experiments were carried out by glass sand from Fehérvárcsúrgó and fly-ash from the Power Plant of Mátra, both located in Hungary.
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11.12.2001, L. Tihanyi, E. Bobok, T. Bodi
A NEW MODEL FOR BLOW-OFF OF A GAS PIPELINE
http://www.ogbus.com/eng/authors/Bodi/newmodel.pdf
The authors worked out a calculation process and software for calculating the working conditions of blow-off systems at technological stations of gas pipelines. One part of the examined system is the closed gas pipeline section, the other is the blow-off pipe provided with a control valve. To create the model they analysed the blow-off process, on the basis of which the simplifying assumptions were determined. The calculation model gives non- steady values of pressure, temperature and the gas flow at chosen points of the system. In the second part of the article the authors present the application of the calculation algorithm with the help of examples for all the three control options. On the basis of the results the changes in the blow-off gas flow and after all the venting time can be seen for each control method,. The elaborate calculation process and software can be used either to plan new flare systems or to analyse the working conditions of existing systems.
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