The Experts below are selected from a list of 21 Experts worldwide ranked by ideXlab platform
Runar Unnthorsson - One of the best experts on this subject based on the ideXlab platform.
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Necessity is the Mother of Invention: The Dawn of Domestic Geothermal Turbine Repairs in Iceland
Volume 1: Fuels and Combustion Material Handling Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines Generators and Auxiliaries, 2014Co-Authors: Reynir Smari Atlason, Almar Gunnarsson, Runar UnnthorssonAbstract:Even though the Icelandic public relies greatly on geothermal power, to date, intensive maintenance procedures on the geothermal turbines have been conducted by foreign contractors. Such repairs are very time consuming, risky, expensive and leak capital out of the country. This has been discussed greatly within the industry and plans have been made on how the power companies, along with domestic machine shops can address this problem. However, in spring 2013 a turbine failure was observed in a routine quadrennial check at the Nesjavellir geothermal power plant. Corrosion products where found on the last set of the Labyrinth Packing and the rotor had been worn down approximately 8 mm radius. The backup rotor was also in a non-operational state. The unexpected downtime in power production had to be minimized in order to fulfill contracts. Because of time constraints, foreign service companies were not considered to be feasible due to their waiting queues and the time required for shipping overseas. This scenario initiated collaboration between the power company and domestic machine shops to manufacture spare parts and conduct the overall repair on site. This was due to several reasons such as; currency exchange rate, machines and know-how at the machine shops had improved over the last decade and the fact that the power company was ready to pay for the development cost. This paper presents the problem, how it was solved collaboratively domestically in only a fraction of time that conventional procedures would have taken. The paper investigates the causes of the turbine failure and provides a description the current state of turbine repair facilities in Iceland.Copyright © 2014 by ASME
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Turbine repair at Nesjavellir geothermal power plant: An Icelandic case study
Geothermics, 2014Co-Authors: Reynir Smari Atlason, Almar Gunnarsson, Runar UnnthorssonAbstract:Abstract During a quadrennial inspection of a 30 MW Mitsubishi steam turbine at Nesjavellir geothermal power plant, corrosion products were found on the last set of Labyrinth Packing in the gland seal system which resulted in erosion corrosion of the turbine rotor. The rotor had worn by approximately 8 mm. Because of the tight timeframe of the overhaul, it was decided to repair this failure on site using the experience of the staff and domestic industry. Labyrinth seals were built by a domestic machine shop, decreasing cost and shutdown time dramatically. This article describes the occurring failure and how it was repaired within days with cooperation between the energy company and domestic industry. It further discusses probable causes for such failure and how it may be prevented. The article describes in essence how valuable it can prove to build maintenance knowledge domestically in the geothermal sector.
Reynir Smari Atlason - One of the best experts on this subject based on the ideXlab platform.
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Necessity is the Mother of Invention: The Dawn of Domestic Geothermal Turbine Repairs in Iceland
Volume 1: Fuels and Combustion Material Handling Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines Generators and Auxiliaries, 2014Co-Authors: Reynir Smari Atlason, Almar Gunnarsson, Runar UnnthorssonAbstract:Even though the Icelandic public relies greatly on geothermal power, to date, intensive maintenance procedures on the geothermal turbines have been conducted by foreign contractors. Such repairs are very time consuming, risky, expensive and leak capital out of the country. This has been discussed greatly within the industry and plans have been made on how the power companies, along with domestic machine shops can address this problem. However, in spring 2013 a turbine failure was observed in a routine quadrennial check at the Nesjavellir geothermal power plant. Corrosion products where found on the last set of the Labyrinth Packing and the rotor had been worn down approximately 8 mm radius. The backup rotor was also in a non-operational state. The unexpected downtime in power production had to be minimized in order to fulfill contracts. Because of time constraints, foreign service companies were not considered to be feasible due to their waiting queues and the time required for shipping overseas. This scenario initiated collaboration between the power company and domestic machine shops to manufacture spare parts and conduct the overall repair on site. This was due to several reasons such as; currency exchange rate, machines and know-how at the machine shops had improved over the last decade and the fact that the power company was ready to pay for the development cost. This paper presents the problem, how it was solved collaboratively domestically in only a fraction of time that conventional procedures would have taken. The paper investigates the causes of the turbine failure and provides a description the current state of turbine repair facilities in Iceland.Copyright © 2014 by ASME
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Turbine repair at Nesjavellir geothermal power plant: An Icelandic case study
Geothermics, 2014Co-Authors: Reynir Smari Atlason, Almar Gunnarsson, Runar UnnthorssonAbstract:Abstract During a quadrennial inspection of a 30 MW Mitsubishi steam turbine at Nesjavellir geothermal power plant, corrosion products were found on the last set of Labyrinth Packing in the gland seal system which resulted in erosion corrosion of the turbine rotor. The rotor had worn by approximately 8 mm. Because of the tight timeframe of the overhaul, it was decided to repair this failure on site using the experience of the staff and domestic industry. Labyrinth seals were built by a domestic machine shop, decreasing cost and shutdown time dramatically. This article describes the occurring failure and how it was repaired within days with cooperation between the energy company and domestic industry. It further discusses probable causes for such failure and how it may be prevented. The article describes in essence how valuable it can prove to build maintenance knowledge domestically in the geothermal sector.
Almar Gunnarsson - One of the best experts on this subject based on the ideXlab platform.
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Necessity is the Mother of Invention: The Dawn of Domestic Geothermal Turbine Repairs in Iceland
Volume 1: Fuels and Combustion Material Handling Emissions; Steam Generators; Heat Exchangers and Cooling Systems; Turbines Generators and Auxiliaries, 2014Co-Authors: Reynir Smari Atlason, Almar Gunnarsson, Runar UnnthorssonAbstract:Even though the Icelandic public relies greatly on geothermal power, to date, intensive maintenance procedures on the geothermal turbines have been conducted by foreign contractors. Such repairs are very time consuming, risky, expensive and leak capital out of the country. This has been discussed greatly within the industry and plans have been made on how the power companies, along with domestic machine shops can address this problem. However, in spring 2013 a turbine failure was observed in a routine quadrennial check at the Nesjavellir geothermal power plant. Corrosion products where found on the last set of the Labyrinth Packing and the rotor had been worn down approximately 8 mm radius. The backup rotor was also in a non-operational state. The unexpected downtime in power production had to be minimized in order to fulfill contracts. Because of time constraints, foreign service companies were not considered to be feasible due to their waiting queues and the time required for shipping overseas. This scenario initiated collaboration between the power company and domestic machine shops to manufacture spare parts and conduct the overall repair on site. This was due to several reasons such as; currency exchange rate, machines and know-how at the machine shops had improved over the last decade and the fact that the power company was ready to pay for the development cost. This paper presents the problem, how it was solved collaboratively domestically in only a fraction of time that conventional procedures would have taken. The paper investigates the causes of the turbine failure and provides a description the current state of turbine repair facilities in Iceland.Copyright © 2014 by ASME
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Turbine repair at Nesjavellir geothermal power plant: An Icelandic case study
Geothermics, 2014Co-Authors: Reynir Smari Atlason, Almar Gunnarsson, Runar UnnthorssonAbstract:Abstract During a quadrennial inspection of a 30 MW Mitsubishi steam turbine at Nesjavellir geothermal power plant, corrosion products were found on the last set of Labyrinth Packing in the gland seal system which resulted in erosion corrosion of the turbine rotor. The rotor had worn by approximately 8 mm. Because of the tight timeframe of the overhaul, it was decided to repair this failure on site using the experience of the staff and domestic industry. Labyrinth seals were built by a domestic machine shop, decreasing cost and shutdown time dramatically. This article describes the occurring failure and how it was repaired within days with cooperation between the energy company and domestic industry. It further discusses probable causes for such failure and how it may be prevented. The article describes in essence how valuable it can prove to build maintenance knowledge domestically in the geothermal sector.
Junghyun Kang - One of the best experts on this subject based on the ideXlab platform.
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leakage analysis of angled Labyrinth Packing ring seal for steam turbine using cfd
Tribology and Lubricants, 2009Co-Authors: Taewoong Ha, Junghyun KangAbstract:An angled Labyrinth seal is used for the diaphragm-Packing-ring seal design of steam turbine due to its leakage reduction characteristic. CFD analysis using FLUENT has been performed to predict leakage and determine an optimum slanted angle which yields the best leakage reduction. Results show that the optimum value of slanted angle is independent of number of Labyrinth teeth, inlet pressure, and tooth height to pitch ratio. 3D CFD analysis has been performed for predicting leakage of the angled Labyrinth seal. Comparing with the result of 2D CFD analysis, 3D CFD analysis shows 1.4% smaller.
Cao Lihua - One of the best experts on this subject based on the ideXlab platform.
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research on Labyrinth Packing with lateral teeth and its leakage
Turbine Technology, 2005Co-Authors: Cao LihuaAbstract:In this paper, a new kind of Labyrinth Packing with lateral teeth is put forward. On the premise that the length of Labyrinth Packing is not increased, the new Labyrinth Packing may make the teeth added and the leakage decreased. At the same time, the method of calculating steam leakage is given in terms of the working principle of this new kind of Labyrinth Packing. By taking a nation-made 300MW steam turbine as example, the calculation of leakage of new and common Labyrinth Packing is done. The results indicate that by using the Labyrinth Packing with lateral teeth the leakage is decreased, so that the economy of steam turbine is improved.
