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2018/4
Technique of engineering evaluation of heat flow through shell surface of cryogenic liquefied natural gas tank
Geosciences

Authors: Svetlana G. IVANTSOVA graduated from Gubkin Russian State University of Oil and Gas in 1982, she is Doctor of Technical Sciences, Professor of the Department of Construction and Repair of Gas and Oil Pipelines and Storage Facilities of Gubkin Russian State University of Oil and Gas (National Research University). She is specialist in the field with construction of gas and oil pipelines and storage facilities. She is author of more than 100 scientific publications. E-mail: sivants11@gmail.com
Artem I. RAKHMANIN graduated with honors from Gubkin Russian State University of Oil and Gas in 2010. He is Candidate of Technical Sciences, chief expert of Project Support Department, OOO “PO “Transgas”. He is specialist in the field of safety and operational reliability of cryogenic storage tanks for liquefied natural gas. He is author of 15 scientific publications.
E-mail: artyom.rahmanin@gmail.com

Abstract: Optimization of investment costs for planned projects of the construction of complexes for liquefaction, storage and shipment of natural gas requires methods for calculating the heat regime of cryogenic tanks for liquefied natural gas. These allow to make optimal design decisions on the choice of heat insulation system that directly determines the vaporization rate of the product, and thus the volume of capital investments at the construction stage and the cost of operation of the evaporating gas extraction system and its re-liquefaction. A method of engineering calculation of the heat flow through the multilayer wall of the full containment cryogenic tanks, which consists of an external reinforced concrete wall, carbon steel liner on the internal surface of the reinforced concrete wall, a layer of flexible compensation mats of fiberglass, a layer of loose-fill heat insulation of expanded perlite sand and an internal tank of cold-resistant steel. It is proved, that in heat processes calculations of full containment cryogenic tanks with acceptable for engineering problems accuracy it is possible to approximate the cylindrical surface of the multilayer wall of the tank with a plain surface without taking into account the thermal resistance of the carbon steel liner and the internal shell. It is also possible not to take into account the turbulent convection of the LNG boundary layer along the walls of the inner shell

Index UDK: 622.691.23

Keywords: cryogenic storage tanks, LNG storage, heat insulation, heat calculation

Bibliography:
1. Borisov B.B., Vladimirov A.E., Zvereva T.V., Cherepennikov A.N. Metodika rasheta statsionarnogo temperaturnogo rejima bolsheob’emnih nizkotemperaturnih rezervuarov dl’a hranenia SPG. [The methods of calculating stationary temperature regime of large-volume low-temperature storage tanks for LNG]. Trudy MINHiGP imeni I.M. Gubkina [Proceedings of Moscow Institute оf the Petrochemical and Gas Industry named after I.A. Gubkin], 1980, no. 153, p. 123-131 (In Rusian).
2. Odisharija G.Je., Safonov B.C., Tarabrin V.A. Thermal processes in low-temperature isothermal storages of the liquefied gases. Gazovaja promyshlennost [Gas Industry], 1982, no. 11, p. 43–46. (In Russian).
3. Shklover A.M. Teploperedasha pri periodisheskih teplovih vozdeistviah [Heat transfer under periodic thermal loads]. Moskva-Leningrad, 1961, 160 p.
4. Povalaev M.I. Pokritia i krovli promishlennih zdaniy [Coverings and roofs of industrial buildings]. Moskva, 1969. 177 p.
5. Safonov V.S. Physical features and ways to prevent LNG stratification in the isothermal tanks. Moscow: VNIIJegazprom, 1989. Iss. 7, 50 p. (In Russian).
6. Miheev M.A., Miheeva I.M. Osnovi teploperedashi. [Fundamentals of heat transfer]. Moskva, 1973, 344 p.

2018/3
Effect of heat removal into pumped product on pipe wall temperature gradient during the welding repair of corroded pinholes
Geosciences

Authors: Sergei I. SENСOV graduated from Gubkin Russian State University of Oil and Gas in 1978, he is Doctor of Technical Sciences, Professor of the Department of Construction and Repair of Gas and Oil Pipelines and Storage Facilities of Gubkin Russian State University of Oil and Gas (National research university). He is specialist in the field of construction of gas and oil pipelines and storage facilities and author of over 70 scientific and educational-methodical works. E-mail: srgnp@mail.ru
Vasiliy A. RYBIN graduated from the Tyumen State Oil and Gas University in 2006. Senior researcher of the laboratory of conducting trade registries, Pipeline Transport Institute. Specialist in the field of welding, including welding works in construction and repair of linear part of main gas and oil pipelines. Author of more than 14 scientific articles and a textbook. E-mail: vtec11@mail.ru
Svetlana G. IVANTSOVA graduated from Gubkin Russian State University of Oil and Gas in 1982, she is Doctor of Technical Sciences, Professor of the Department of Construction and Repair of Gas and Oil Pipelines and Storage Facilities of Gubkin Russian State University of Oil and Gas (National research university). She is specialist in the field with construction of gas and oil pipelines and storage facilities. She is author of over 60 scientific and educational-methodical works. E-mail: sivants11@gmail.com

Abstract: Currently, welding is the most progressive method of repairing local corrosion damage on the outer surface of the linear part of the mains. However, heating of the pipe wall by welding, which occurs due to the action of a concentrated source of heat (welding arc) softens the metal of the repaired surface, which creates the risk of an emergency. The authors present the results of the studies of thermal processes occurring in the pipe wall repaired by welding. The authors have identified the zone of guaranteed strength properties, providing a reserve for temporary resistance to metal pipe rupture during repair, and also established the relationship between the thickness of the specified area and the amount of running energy and heat removal into the pumped product during repair. A mathematical model describing the polynomial dependence of the thickness of the zone of guaranteed strength properties on the effective thermal power of the welding arc, the speed of its movement and the residual thickness of the pipe wall at the repair site are presented

Index UDK: 621.644

Keywords: oil trunk pipelines, repair method, local corrosion, thermal processes, running energy

Bibliography:
1. Hagen Yu.V., Taran V.D. Thermal analysis in welding of piping and structures. Serpukhov, Serpukhov printing house, 1970, 86 p.
2. Rykalin H.H. Calculations of thermal processes in welding. Moscow, Mashgiz, 1951, 296 p.
3. Rykalin H.H. thermal parameters of the welding arc. Thermal processes in welding. Proceedings of the section on scientific development of problems of electric welding and electrothermy, 1953, vol. 2, p. 10-58, 87.