TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Milovanović, Nebojša
AU  - Minić, M.
AU  - Savić, Zoran
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5246
AB  - Hydro power plant ’Pirot’, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3 000 to 3 500 mm. Pipeline, made of 22 mm thick pipes, has been designed and built without anchor blocks at curvatures, which is a rarity elsewhere. Maximum pressure of 2.5 MPa occurs in front of the turbine cover.
This paper contains the analysis of the state of the generator shaft on which the mechanical damages were detected, as well as the analysis of the state of vanes of the upper and lower ventilation ring designed for air cooling of the generator rotor where corrosion, erosion and, most ofall, cavitation damages were detected, based on results of non-destructive testing (visual  testing, penetrant testing, ultrasonic testing). Procedures for the rehabilitation of damaged components without disassembling them were defined. The execution of these procedures helped in saving approximately 100 000 €.
Taking into account the period of time necessary to perform complete disassembling of components, as well as the period of time needed to perform reassembling, which is directly linked with the amount of energy the hydroelectric generating set A2 would produce during that period, the overall save would mount up to approximately 500.000 €.
PB  - Mechanical Engineering Faculty in Slavonski Brod
C3  - Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
T1  - Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’
EP  - 17
SP  - 13
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5246
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Milovanović, Nebojša and Minić, M. and Savić, Zoran",
year = "2015",
abstract = "Hydro power plant ’Pirot’, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above-ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3 000 to 3 500 mm. Pipeline, made of 22 mm thick pipes, has been designed and built without anchor blocks at curvatures, which is a rarity elsewhere. Maximum pressure of 2.5 MPa occurs in front of the turbine cover.
This paper contains the analysis of the state of the generator shaft on which the mechanical damages were detected, as well as the analysis of the state of vanes of the upper and lower ventilation ring designed for air cooling of the generator rotor where corrosion, erosion and, most ofall, cavitation damages were detected, based on results of non-destructive testing (visual  testing, penetrant testing, ultrasonic testing). Procedures for the rehabilitation of damaged components without disassembling them were defined. The execution of these procedures helped in saving approximately 100 000 €.
Taking into account the period of time necessary to perform complete disassembling of components, as well as the period of time needed to perform reassembling, which is directly linked with the amount of energy the hydroelectric generating set A2 would produce during that period, the overall save would mount up to approximately 500.000 €.",
publisher = "Mechanical Engineering Faculty in Slavonski Brod",
journal = "Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015",
title = "Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’",
pages = "17-13",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5246"
}

Arsić, M., Bošnjak, S., Grabulov, V., Milovanović, N., Minić, M.,& Savić, Z.. (2015). Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’. in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
Mechanical Engineering Faculty in Slavonski Brod., 13-17.
https://hdl.handle.net/21.15107/rcub_machinery_5246

Arsić M, Bošnjak S, Grabulov V, Milovanović N, Minić M, Savić Z. Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’. in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015. 2015;:13-17.
https://hdl.handle.net/21.15107/rcub_machinery_5246 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Milovanović, Nebojša, Minić, M., Savić, Zoran, "Repair of damages detected at the shaft and ventilation ring vanes of the hydroelectric generating set A2 generator at the hydro power plant ’Pirot’" in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015 (2015):13-17,
https://hdl.handle.net/21.15107/rcub_machinery_5246 .

TY  - CONF
AU  - Arsić, Miodrag
AU  - Bošnjak, Srđan
AU  - Grabulov, Vencislav
AU  - Mladenović, M.
AU  - Minić, M.
PY  - 2015
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/5244
AB  - Hydro power plant Pirot, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above - ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 m. Pipes have been made of S275J2G3 steel. [1] Pipe wall is 22 mm thick. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. [2]
Pipeline has been designed and built without anchor blocks at curvatures, which is rarity elsewhere. Geodetic measurements have been conducted permanently from the day the assembly was finished and pipeline was put into service, both when pipeline is empty and unloaded by hydrostatic pressure and when it is full. Analysis of obtained data regards the movements along the pipeline route showed that from year 2003 there are significantly higher differences in movements comparing the situations when the pipeline is full and when it is empty in comparison with the previous period.
Those differences primarily refers to tangential movements of vertices marked with numbers 6, 7 and 8, which, compared to the period until year 2002, are in the range from 3 mm for vertex 8 to 5 mm for vertex 6. Apart from geodetic measurements, the measurement of pipe diameter in 2 directions is also being carried out permanently. Those data show that from year 2003. the diameter in horizontal direction started to increase significantly, while at the same time the diameter in vertical direction started to decrease less significantly.
This paper contains the analysis of current state and integrity evaluation of the pipeline as a whole on the basis of results of non - destructive tests performed on the vital butt - welded joint in the curvature area at chainage 1+263 m (visual testing, magnetic particle testing, penetrant testing, ultrasonic testing, radiographic testing, metallographic replication testing).
PB  - Mechanical Engineering Faculty in Slavonski Brod
C3  - Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
T1  - Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot"
EP  - 12
SP  - 5
UR  - https://hdl.handle.net/21.15107/rcub_machinery_5244
ER  - 

@conference{
author = "Arsić, Miodrag and Bošnjak, Srđan and Grabulov, Vencislav and Mladenović, M. and Minić, M.",
year = "2015",
abstract = "Hydro power plant Pirot, which was built in 1990, is an accumulation-derivative power plant, which consists of 2 above - ground vertical hydroelectric generating sets that contain Francis turbines with nominal power of 41,5 MW, manufactured in Czech Republic, a tunnel and a sunken pipeline with overall length of 2.030 m and diameter that ranges from 3.000 to 3.500 m. Pipes have been made of S275J2G3 steel. [1] Pipe wall is 22 mm thick. Maximum pressure of 2.5 MPa occurs in front of the turbine cover. [2]
Pipeline has been designed and built without anchor blocks at curvatures, which is rarity elsewhere. Geodetic measurements have been conducted permanently from the day the assembly was finished and pipeline was put into service, both when pipeline is empty and unloaded by hydrostatic pressure and when it is full. Analysis of obtained data regards the movements along the pipeline route showed that from year 2003 there are significantly higher differences in movements comparing the situations when the pipeline is full and when it is empty in comparison with the previous period.
Those differences primarily refers to tangential movements of vertices marked with numbers 6, 7 and 8, which, compared to the period until year 2002, are in the range from 3 mm for vertex 8 to 5 mm for vertex 6. Apart from geodetic measurements, the measurement of pipe diameter in 2 directions is also being carried out permanently. Those data show that from year 2003. the diameter in horizontal direction started to increase significantly, while at the same time the diameter in vertical direction started to decrease less significantly.
This paper contains the analysis of current state and integrity evaluation of the pipeline as a whole on the basis of results of non - destructive tests performed on the vital butt - welded joint in the curvature area at chainage 1+263 m (visual testing, magnetic particle testing, penetrant testing, ultrasonic testing, radiographic testing, metallographic replication testing).",
publisher = "Mechanical Engineering Faculty in Slavonski Brod",
journal = "Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015",
title = "Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot"",
pages = "12-5",
url = "https://hdl.handle.net/21.15107/rcub_machinery_5244"
}

Arsić, M., Bošnjak, S., Grabulov, V., Mladenović, M.,& Minić, M.. (2015). Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot". in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015
Mechanical Engineering Faculty in Slavonski Brod., 5-12.
https://hdl.handle.net/21.15107/rcub_machinery_5244

Arsić M, Bošnjak S, Grabulov V, Mladenović M, Minić M. Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot". in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015. 2015;:5-12.
https://hdl.handle.net/21.15107/rcub_machinery_5244 .

Arsić, Miodrag, Bošnjak, Srđan, Grabulov, Vencislav, Mladenović, M., Minić, M., "Analysis of current state and integrity evaluation of the pipeline at hydro power plant "Pirot"" in Proceedings of the 8th International Scientific-Professional Conference Design, Production and Service of Welded Constructions and Products – SBZ 2015 (2015):5-12,
https://hdl.handle.net/21.15107/rcub_machinery_5244 .