TY  - JOUR
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Sedmak, Simon
AU  - Vistać, Brane
AU  - Savić, Zoran
PY  - 2019
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3211
AB  - During the revitalization of the hydroelectric generating station A4 at the hydro power plant 'Djerdap 1', all of its parts are subjected to non-destructive testing. Cracks are detected in cast part of generator rotor hub, in the flange area toward the turbine shaft. Cracks were 10-500 mm long (determined by magnetic particle tests) and 60-100 mm deep (ultrasonic tests). The generator rotor hub is made of cast steel 25L, in accordance with the standard 977-75. The welding/surface welding repair technology in the detected crack zones of the cast part of generator rotor hub includes a large number of details, due to the structural solution and generator rotor function in service. It was also necessary to provide the carefully undertaken activities in order to enable safe operation and continuous use of the rotor hub. Failing to notice, underestimation or incorrect perception of important details could cause significant problems in hydroelectric generating station operation. The paper, due to specifics of reparation technology, contains arranged preparatory activities for the procedure apart from the welding/surface welding technology. It is of importance to mention a huge amount of money savings, The manufacture of a new generator rotor would cost over 4 million EUR (generator mass is over 300 tonnes), not taking into account the time needed for its making (6-12 months), which is directly related to the amount of energy a hydroelectric generating station can produce during that period. This technology of repair welding is also applicable for other components and structures of the turbine and the hydromechanical equipment subjected to various causes of damage during exploitation.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Structural Integrity and Life
T1  - Repair of cracks detected in cast components of vertical kaplan turbine rotor hub
EP  - 250
IS  - 3
SP  - 243
VL  - 19
UR  - https://hdl.handle.net/21.15107/rcub_machinery_3211
ER  - 

@article{
author = "Arsić, Miodrag and Bošnjak, Srđan and Sedmak, Simon and Vistać, Brane and Savić, Zoran",
year = "2019",
abstract = "During the revitalization of the hydroelectric generating station A4 at the hydro power plant 'Djerdap 1', all of its parts are subjected to non-destructive testing. Cracks are detected in cast part of generator rotor hub, in the flange area toward the turbine shaft. Cracks were 10-500 mm long (determined by magnetic particle tests) and 60-100 mm deep (ultrasonic tests). The generator rotor hub is made of cast steel 25L, in accordance with the standard 977-75. The welding/surface welding repair technology in the detected crack zones of the cast part of generator rotor hub includes a large number of details, due to the structural solution and generator rotor function in service. It was also necessary to provide the carefully undertaken activities in order to enable safe operation and continuous use of the rotor hub. Failing to notice, underestimation or incorrect perception of important details could cause significant problems in hydroelectric generating station operation. The paper, due to specifics of reparation technology, contains arranged preparatory activities for the procedure apart from the welding/surface welding technology. It is of importance to mention a huge amount of money savings, The manufacture of a new generator rotor would cost over 4 million EUR (generator mass is over 300 tonnes), not taking into account the time needed for its making (6-12 months), which is directly related to the amount of energy a hydroelectric generating station can produce during that period. This technology of repair welding is also applicable for other components and structures of the turbine and the hydromechanical equipment subjected to various causes of damage during exploitation.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Structural Integrity and Life",
title = "Repair of cracks detected in cast components of vertical kaplan turbine rotor hub",
pages = "250-243",
number = "3",
volume = "19",
url = "https://hdl.handle.net/21.15107/rcub_machinery_3211"
}

Arsić, M., Bošnjak, S., Sedmak, S., Vistać, B.,& Savić, Z.. (2019). Repair of cracks detected in cast components of vertical kaplan turbine rotor hub. in Structural Integrity and Life
Institut za ispitivanje materijala, Beograd., 19(3), 243-250.
https://hdl.handle.net/21.15107/rcub_machinery_3211

Arsić M, Bošnjak S, Sedmak S, Vistać B, Savić Z. Repair of cracks detected in cast components of vertical kaplan turbine rotor hub. in Structural Integrity and Life. 2019;19(3):243-250.
https://hdl.handle.net/21.15107/rcub_machinery_3211 .

Arsić, Miodrag, Bošnjak, Srđan, Sedmak, Simon, Vistać, Brane, Savić, Zoran, "Repair of cracks detected in cast components of vertical kaplan turbine rotor hub" in Structural Integrity and Life, 19, no. 3 (2019):243-250,
https://hdl.handle.net/21.15107/rcub_machinery_3211 .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Vistać, Brane
AU  - Savić, Zoran
PY  - 2018
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5297
AB  - Vertical Kaplan turbines were installed in 6 hydroelectric generating sets at "Djerdap 1", nominal power 178 MW, that were made in Russia. During the refurbishment of the hydroelectric generating set Al at the hydro power plant Djerdap 1, experimental non-destructive tests on all of its components were performed in order to determine the state of the turbine as a whole. During the testing the damages and cracks were detected on internal surfaces of cranks and sleeves of guide vane apparatus vanes, which were caused by turbine shaft vibrations. Cranks and sleeves were made of cast steel 25L, in accordance with the standard GOST 977. The repair methodology for damaged internal surfaces of cranks of guide vane apparatus vanes is presented in this paper. It was necessary, due to the structural solution used for the design of cranks and sleeves and their function during exploitation, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of cranks. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.
PB  - Macedonian Union of Metallurgists
C3  - VIIIth International Metallurgical Congress
T1  - Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus
EP  - 6
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5297
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Vistać, Brane and Savić, Zoran",
year = "2018",
abstract = "Vertical Kaplan turbines were installed in 6 hydroelectric generating sets at "Djerdap 1", nominal power 178 MW, that were made in Russia. During the refurbishment of the hydroelectric generating set Al at the hydro power plant Djerdap 1, experimental non-destructive tests on all of its components were performed in order to determine the state of the turbine as a whole. During the testing the damages and cracks were detected on internal surfaces of cranks and sleeves of guide vane apparatus vanes, which were caused by turbine shaft vibrations. Cranks and sleeves were made of cast steel 25L, in accordance with the standard GOST 977. The repair methodology for damaged internal surfaces of cranks of guide vane apparatus vanes is presented in this paper. It was necessary, due to the structural solution used for the design of cranks and sleeves and their function during exploitation, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of cranks. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.",
publisher = "Macedonian Union of Metallurgists",
journal = "VIIIth International Metallurgical Congress",
title = "Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus",
pages = "6-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5297"
}

Arsić, M., Bošnjak, S., Grabulov, V., Vistać, B.,& Savić, Z.. (2018). Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus. in VIIIth International Metallurgical Congress
Macedonian Union of Metallurgists., 1-6.
https://hdl.handle.net/21.15107/rcub_machinery_5297

Arsić M, Bošnjak S, Grabulov V, Vistać B, Savić Z. Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus. in VIIIth International Metallurgical Congress. 2018;:1-6.
https://hdl.handle.net/21.15107/rcub_machinery_5297 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Vistać, Brane, Savić, Zoran, "Repair of damaged surfaces at the vital section of the regulatory mechanism of the hydro turbine guide vane apparatus" in VIIIth International Metallurgical Congress (2018):1-6,
https://hdl.handle.net/21.15107/rcub_machinery_5297 .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Vistać, Brane
AU  - Bošnjak, Srđan
AU  - Mladenović, M.
AU  - Savić, Zoran
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5264
AB  - Vertical Kaplan turbines with nominal power of 200 MW, made in Russia, have been installed at 6 hydroelectric generating sets of "Djerdap 1". Most of the components were made of steel in accor-dance with GOST and ASTM- standards. During the rehabilitation of the hydroelectric generating set A6 non-destructive testing methods were performed on parent material and welded joints of the main oil/air tank and air tank with the auxiliary oil/air tank, which acts as pressure accumulator in the regulation system, in order to carry out the analysis of the current state and integrity evaluation for the regulation system- of the turbine. Shells of all 3 tanks were made of steel Č 1205, while bottoms were made of russian steel St 20K Tests were also performed on pipeline elements (pipes and elbows). The results of non-destructive tests performed on air tank are presented in this paper Mechanical damages were detected by visual inspection at parent material of the shell and at the upper bottom, as well as discontinuous and incompletely welded joints on the inside and outside of the tank. Sur-face linear crack type indications were detected through magnetic particle testing at intersections of welded joints on the inside of the tank. Internal crack type defects were detected through ultrasonic testing of welded joints On the basis of test results the technology of reparatory welding / surface welding of parent mate-rial and welded joints was created, while on the basis of the analytical calculation of tank strength the evaluation of its integrity for the following 40 years of operation was obtained.
PB  - Savez energetičara
T2  - Energija (Energija, ekonomija, ekologija)
T1  - Analysis of current state and integrity evaluation for the air tank of the regulation system of turbine A6 at hydropower plant Djerdap 1
EP  - 391
IS  - 1-2
SP  - 385
VL  - 16
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5264
ER  - 

@article{
author = "Arsić, Miodrag and Vistać, Brane and Bošnjak, Srđan and Mladenović, M. and Savić, Zoran",
year = "2014",
abstract = "Vertical Kaplan turbines with nominal power of 200 MW, made in Russia, have been installed at 6 hydroelectric generating sets of "Djerdap 1". Most of the components were made of steel in accor-dance with GOST and ASTM- standards. During the rehabilitation of the hydroelectric generating set A6 non-destructive testing methods were performed on parent material and welded joints of the main oil/air tank and air tank with the auxiliary oil/air tank, which acts as pressure accumulator in the regulation system, in order to carry out the analysis of the current state and integrity evaluation for the regulation system- of the turbine. Shells of all 3 tanks were made of steel Č 1205, while bottoms were made of russian steel St 20K Tests were also performed on pipeline elements (pipes and elbows). The results of non-destructive tests performed on air tank are presented in this paper Mechanical damages were detected by visual inspection at parent material of the shell and at the upper bottom, as well as discontinuous and incompletely welded joints on the inside and outside of the tank. Sur-face linear crack type indications were detected through magnetic particle testing at intersections of welded joints on the inside of the tank. Internal crack type defects were detected through ultrasonic testing of welded joints On the basis of test results the technology of reparatory welding / surface welding of parent mate-rial and welded joints was created, while on the basis of the analytical calculation of tank strength the evaluation of its integrity for the following 40 years of operation was obtained.",
publisher = "Savez energetičara",
journal = "Energija (Energija, ekonomija, ekologija)",
title = "Analysis of current state and integrity evaluation for the air tank of the regulation system of turbine A6 at hydropower plant Djerdap 1",
pages = "391-385",
number = "1-2",
volume = "16",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5264"
}

Arsić, M., Vistać, B., Bošnjak, S., Mladenović, M.,& Savić, Z.. (2014). Analysis of current state and integrity evaluation for the air tank of the regulation system of turbine A6 at hydropower plant Djerdap 1. in Energija (Energija, ekonomija, ekologija)
Savez energetičara., 16(1-2), 385-391.
https://hdl.handle.net/21.15107/rcub_machinery_5264

Arsić M, Vistać B, Bošnjak S, Mladenović M, Savić Z. Analysis of current state and integrity evaluation for the air tank of the regulation system of turbine A6 at hydropower plant Djerdap 1. in Energija (Energija, ekonomija, ekologija). 2014;16(1-2):385-391.
https://hdl.handle.net/21.15107/rcub_machinery_5264 .

Arsić, Miodrag, Vistać, Brane, Bošnjak, Srđan, Mladenović, M., Savić, Zoran, "Analysis of current state and integrity evaluation for the air tank of the regulation system of turbine A6 at hydropower plant Djerdap 1" in Energija (Energija, ekonomija, ekologija), 16, no. 1-2 (2014):385-391,
https://hdl.handle.net/21.15107/rcub_machinery_5264 .

TY  - CONF
AU  - Arsić, M.
AU  - Vistać, Brane
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Savić, Zoran
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1962
AB  - Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’. During the refurbishment of hydropower plant experimental non-destructive tests were performed in order to determine the state of turbine components. During the course of testing damage was detected at sleeves and welded shields of guide vanes, which occurred as a consequence of turbine shaft vibrations. 1782 mm long guide vane sleeves were made of cast steel 25L (GOST standard), 260 mm long sleeve was made of forged steel St 25 (GOST standard), while welded shields of guide vanes were made of austenitic steel 08X18H10T (GOST standard). Results of experimental tests and methodology for reparation of damaged surfaces of sleeves and welded shields of guide vanes are presented in this paper. It was necessary, due to the structural solution used for the design of guide vanes and their function during service, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of vanes through the use of reparation methodology for welding/surface welding of sleeves and welded shields. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.
PB  - Trans Tech Publications Ltd
C3  - Advanced Materials Research
T1  - Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1
EP  - 13
SP  - 8
VL  - 1029
DO  - 10.4028/www.scientific.net/AMR.1029.8
ER  - 

@conference{
author = "Arsić, M. and Vistać, Brane and Bošnjak, Srđan and Grabulov, Vencislav and Savić, Zoran",
year = "2014",
abstract = "Vertical Kaplan turbines, manufactured in Russia and with nominal power of 200 MW, have been installed in 6 hydroelectric generating units at ’Djerdap 1’. During the refurbishment of hydropower plant experimental non-destructive tests were performed in order to determine the state of turbine components. During the course of testing damage was detected at sleeves and welded shields of guide vanes, which occurred as a consequence of turbine shaft vibrations. 1782 mm long guide vane sleeves were made of cast steel 25L (GOST standard), 260 mm long sleeve was made of forged steel St 25 (GOST standard), while welded shields of guide vanes were made of austenitic steel 08X18H10T (GOST standard). Results of experimental tests and methodology for reparation of damaged surfaces of sleeves and welded shields of guide vanes are presented in this paper. It was necessary, due to the structural solution used for the design of guide vanes and their function during service, to define a large number of details, carefully reconsider them and carry out all activities with extreme care in order to enable the safe operation and continuous use of vanes through the use of reparation methodology for welding/surface welding of sleeves and welded shields. Overlooking, underestimation or incorrect perception of important details could cause significant problems during turbine operation.",
publisher = "Trans Tech Publications Ltd",
journal = "Advanced Materials Research",
title = "Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1",
pages = "13-8",
volume = "1029",
doi = "10.4028/www.scientific.net/AMR.1029.8"
}

Arsić, M., Vistać, B., Bošnjak, S., Grabulov, V.,& Savić, Z.. (2014). Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1. in Advanced Materials Research
Trans Tech Publications Ltd., 1029, 8-13.
https://doi.org/10.4028/www.scientific.net/AMR.1029.8

Arsić M, Vistać B, Bošnjak S, Grabulov V, Savić Z. Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1. in Advanced Materials Research. 2014;1029:8-13.
doi:10.4028/www.scientific.net/AMR.1029.8 .

Arsić, M., Vistać, Brane, Bošnjak, Srđan, Grabulov, Vencislav, Savić, Zoran, "Methodology for reparation of damaged sleeves and welded shield sections of guide vanes at hydropower plant DJERDAP 1" in Advanced Materials Research, 1029 (2014):8-13,
https://doi.org/10.4028/www.scientific.net/AMR.1029.8 . .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Vistać, Brane
AU  - Bošnjak, Srđan
AU  - Bošković, Goran
AU  - Savić, Zoran
PY  - 2014
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1847
AB  - Turbine and hydromechanical equipment at hydro power plant 'Đerdap 1' is subjected to service conditions which lead to degradation of materials and structures. Taking into account the frequency of failure occurrence and experience accumulated through long term testing and determination of state, it can be concluded that basic causes of equipment degradation are: oscillations, fatigue, corrosion, erosion and cavitation. It is the responsibility of manufacturers of turbine and hydromechanical equipment to make sure that all vital parts and supporting structures are made in compliance with technical requirements, suitable standards and european directives that refer to structural integrity. Applicability of Pressure Equipment Directive 97/23/EC and Machinery Directive 98/37/EEC is especially relevant, due to the fact that certain parts and structures of turbine regulation system, lubrication system, turbine runner and measurement system are subject to one of the above mentioned directives. This paper contains the overview and basic parameters of new and general approach to standardization and technical harmonization of hydro power plant equipment that refers to structural integrity.
PB  - Institut IMK "14. oktobar", Kruševac
T2  - IMK-14 - Istraživanje i razvoj
T1  - Guidelines for technical regulations and standardization of turbine and hydromechanical equipment during production and exploitation
EP  - 7
IS  - 1
SP  - 1
VL  - 20
DO  - 10.5937/IMK1401001A
ER  - 

@article{
author = "Arsić, Miodrag and Vistać, Brane and Bošnjak, Srđan and Bošković, Goran and Savić, Zoran",
year = "2014",
abstract = "Turbine and hydromechanical equipment at hydro power plant 'Đerdap 1' is subjected to service conditions which lead to degradation of materials and structures. Taking into account the frequency of failure occurrence and experience accumulated through long term testing and determination of state, it can be concluded that basic causes of equipment degradation are: oscillations, fatigue, corrosion, erosion and cavitation. It is the responsibility of manufacturers of turbine and hydromechanical equipment to make sure that all vital parts and supporting structures are made in compliance with technical requirements, suitable standards and european directives that refer to structural integrity. Applicability of Pressure Equipment Directive 97/23/EC and Machinery Directive 98/37/EEC is especially relevant, due to the fact that certain parts and structures of turbine regulation system, lubrication system, turbine runner and measurement system are subject to one of the above mentioned directives. This paper contains the overview and basic parameters of new and general approach to standardization and technical harmonization of hydro power plant equipment that refers to structural integrity.",
publisher = "Institut IMK "14. oktobar", Kruševac",
journal = "IMK-14 - Istraživanje i razvoj",
title = "Guidelines for technical regulations and standardization of turbine and hydromechanical equipment during production and exploitation",
pages = "7-1",
number = "1",
volume = "20",
doi = "10.5937/IMK1401001A"
}

Arsić, M., Vistać, B., Bošnjak, S., Bošković, G.,& Savić, Z.. (2014). Guidelines for technical regulations and standardization of turbine and hydromechanical equipment during production and exploitation. in IMK-14 - Istraživanje i razvoj
Institut IMK "14. oktobar", Kruševac., 20(1), 1-7.
https://doi.org/10.5937/IMK1401001A

Arsić M, Vistać B, Bošnjak S, Bošković G, Savić Z. Guidelines for technical regulations and standardization of turbine and hydromechanical equipment during production and exploitation. in IMK-14 - Istraživanje i razvoj. 2014;20(1):1-7.
doi:10.5937/IMK1401001A .

Arsić, Miodrag, Vistać, Brane, Bošnjak, Srđan, Bošković, Goran, Savić, Zoran, "Guidelines for technical regulations and standardization of turbine and hydromechanical equipment during production and exploitation" in IMK-14 - Istraživanje i razvoj, 20, no. 1 (2014):1-7,
https://doi.org/10.5937/IMK1401001A . .

TY  - JOUR
AU  - Arsić, Miodrag
AU  - Karić, Radovan
AU  - Sedmak, Aleksandar
AU  - Burzić, Meri
AU  - Vistać, Brane
PY  - 2013
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/1630
AB  - Horizontalne Kaplanove turbine su instalirane u hidroelektrani 'ĐERDAP 2', 10 jedinica ukupne snage 28 MW. Uzimajući u obzir činjenicu da se zamor pojavio u mnogim komponentama, sprovedeno je istraživanje uticaja režima opterećenja, radnih uslova i vrste oštećenja na njihov radni vek. Korišćenjem analitičkih izraza, izračunato je da savojni naponi koji deluju na turbinsko vratilo, a pod dejstvom zamora, korozije i koncentracije napona, prelaze vrednost 25 MPa na prirubnici koja je izložena dejstvu vode, odnosno, 40 MPa na prirubnici koja je izložena 'korozivnoj vodi', a zaštićena je epoksi premazom, što može da izazove pojavu površinskih prslina u prelaznom radijusu između cilindričnog dela vratila i prirubnice.
AB  - Horizontal Kaplan turbines, were installed in 10 hydro-electric generating units at 'ĐERDAP 2', total power of 28 MW. Taking into account the fact that fatigue started to occur in many components, the research is conducted regarding the influence of loading regime, work condition and type of damage, on the service life of equipment components. Analytical calculation established values of bending stresses acting on the turbine shaft due to fatigue, corrosion, and stress concentration, that are above 25 MPa in flanges exposed to water, and over 40 MPa for flanges exposed to 'corrosive water', which is also protected by epoxy fibres, possibly causing the occurrence of surface cracks on the transition radius between the cylindrical part of the shaft and the flange.
PB  - Institut za ispitivanje materijala, Beograd
T2  - Integritet i vek konstrukcija
T1  - Metodološki pristup proceni integriteta i veka rotacione opreme u hidroelektrani - turbinsko vratilo
T1  - Methodological approach to integrity assessment and service life of rotating equipment at hydropower plant: Turbine shaft
EP  - 124
IS  - 2
SP  - 117
VL  - 13
UR  - https://hdl.handle.net/21.15107/rcub_machinery_1630
ER  - 

@article{
author = "Arsić, Miodrag and Karić, Radovan and Sedmak, Aleksandar and Burzić, Meri and Vistać, Brane",
year = "2013",
abstract = "Horizontalne Kaplanove turbine su instalirane u hidroelektrani 'ĐERDAP 2', 10 jedinica ukupne snage 28 MW. Uzimajući u obzir činjenicu da se zamor pojavio u mnogim komponentama, sprovedeno je istraživanje uticaja režima opterećenja, radnih uslova i vrste oštećenja na njihov radni vek. Korišćenjem analitičkih izraza, izračunato je da savojni naponi koji deluju na turbinsko vratilo, a pod dejstvom zamora, korozije i koncentracije napona, prelaze vrednost 25 MPa na prirubnici koja je izložena dejstvu vode, odnosno, 40 MPa na prirubnici koja je izložena 'korozivnoj vodi', a zaštićena je epoksi premazom, što može da izazove pojavu površinskih prslina u prelaznom radijusu između cilindričnog dela vratila i prirubnice., Horizontal Kaplan turbines, were installed in 10 hydro-electric generating units at 'ĐERDAP 2', total power of 28 MW. Taking into account the fact that fatigue started to occur in many components, the research is conducted regarding the influence of loading regime, work condition and type of damage, on the service life of equipment components. Analytical calculation established values of bending stresses acting on the turbine shaft due to fatigue, corrosion, and stress concentration, that are above 25 MPa in flanges exposed to water, and over 40 MPa for flanges exposed to 'corrosive water', which is also protected by epoxy fibres, possibly causing the occurrence of surface cracks on the transition radius between the cylindrical part of the shaft and the flange.",
publisher = "Institut za ispitivanje materijala, Beograd",
journal = "Integritet i vek konstrukcija",
title = "Metodološki pristup proceni integriteta i veka rotacione opreme u hidroelektrani - turbinsko vratilo, Methodological approach to integrity assessment and service life of rotating equipment at hydropower plant: Turbine shaft",
pages = "124-117",
number = "2",
volume = "13",
url = "https://hdl.handle.net/21.15107/rcub_machinery_1630"
}

Arsić, M., Karić, R., Sedmak, A., Burzić, M.,& Vistać, B.. (2013). Metodološki pristup proceni integriteta i veka rotacione opreme u hidroelektrani - turbinsko vratilo. in Integritet i vek konstrukcija
Institut za ispitivanje materijala, Beograd., 13(2), 117-124.
https://hdl.handle.net/21.15107/rcub_machinery_1630

Arsić M, Karić R, Sedmak A, Burzić M, Vistać B. Metodološki pristup proceni integriteta i veka rotacione opreme u hidroelektrani - turbinsko vratilo. in Integritet i vek konstrukcija. 2013;13(2):117-124.
https://hdl.handle.net/21.15107/rcub_machinery_1630 .

Arsić, Miodrag, Karić, Radovan, Sedmak, Aleksandar, Burzić, Meri, Vistać, Brane, "Metodološki pristup proceni integriteta i veka rotacione opreme u hidroelektrani - turbinsko vratilo" in Integritet i vek konstrukcija, 13, no. 2 (2013):117-124,
https://hdl.handle.net/21.15107/rcub_machinery_1630 .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Međo, Bojan
AU  - Burzić, Meri
AU  - Vistać, Brane
AU  - Savić, Zoran
PY  - 2012
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5253
AB  - Horizontal Kaplan turbines, were installed in 10 generating sets units at „DJERDAP 2“. After 163.411 hours of operation, the fracture of the hydro-electric generating set A6 turbine shaft in the area of high stress concentration occurred, at the transition radius between the flange and the runner hub. In this paper the results of the analytical calculation regarding the strength of the turbine shaft are presented and influence of the corrosive environment, as well as tests regarding the fatigue. Tensile tests under constant amplitude loading were carried out on smooth specimens in order to determine fatigue properties of the base material, as well as bending tests on notched specimens in order to determine fracture mechanics parameters, or correlation between the crack growth rate da/dN and the stress intensity factor ΔK. It has been established that stress values were higher than allowable values, which led to the occurence of many cracks due to fatigue corrosion. One of those cracks caused the fracture.
PB  - Društvo termičara Srbije
C3  - International Conference Power Plants 2012
T1  - Influence of loading regimes and operational environment on fatigue state of components of turbine and hydromechanical equipment at hydropower
EP  - 10
SP  - 1
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5253
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Međo, Bojan and Burzić, Meri and Vistać, Brane and Savić, Zoran",
year = "2012",
abstract = "Horizontal Kaplan turbines, were installed in 10 generating sets units at „DJERDAP 2“. After 163.411 hours of operation, the fracture of the hydro-electric generating set A6 turbine shaft in the area of high stress concentration occurred, at the transition radius between the flange and the runner hub. In this paper the results of the analytical calculation regarding the strength of the turbine shaft are presented and influence of the corrosive environment, as well as tests regarding the fatigue. Tensile tests under constant amplitude loading were carried out on smooth specimens in order to determine fatigue properties of the base material, as well as bending tests on notched specimens in order to determine fracture mechanics parameters, or correlation between the crack growth rate da/dN and the stress intensity factor ΔK. It has been established that stress values were higher than allowable values, which led to the occurence of many cracks due to fatigue corrosion. One of those cracks caused the fracture.",
publisher = "Društvo termičara Srbije",
journal = "International Conference Power Plants 2012",
title = "Influence of loading regimes and operational environment on fatigue state of components of turbine and hydromechanical equipment at hydropower",
pages = "10-1",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5253"
}

Arsić, M., Bošnjak, S., Međo, B., Burzić, M., Vistać, B.,& Savić, Z.. (2012). Influence of loading regimes and operational environment on fatigue state of components of turbine and hydromechanical equipment at hydropower. in International Conference Power Plants 2012
Društvo termičara Srbije., 1-10.
https://hdl.handle.net/21.15107/rcub_machinery_5253

Arsić M, Bošnjak S, Međo B, Burzić M, Vistać B, Savić Z. Influence of loading regimes and operational environment on fatigue state of components of turbine and hydromechanical equipment at hydropower. in International Conference Power Plants 2012. 2012;:1-10.
https://hdl.handle.net/21.15107/rcub_machinery_5253 .

Arsić, Miodrag, Bošnjak, Srđan, Međo, Bojan, Burzić, Meri, Vistać, Brane, Savić, Zoran, "Influence of loading regimes and operational environment on fatigue state of components of turbine and hydromechanical equipment at hydropower" in International Conference Power Plants 2012 (2012):1-10,
https://hdl.handle.net/21.15107/rcub_machinery_5253 .