The Experts below are selected from a list of 189 Experts worldwide ranked by ideXlab platform
Cristiano Lotti - One of the best experts on this subject based on the ideXlab platform.
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design and development of a specially modified positive displacement rotary screw pump and relevant hydraulic circuit to enhance entrained air handling capability in a closed loop Lube Oil System
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2014Co-Authors: Simone Berti, Pietro Fracassi, Alessandra Mattioli, Varuna Reddy Potula, Cristiano LottiAbstract:Rotary screw type positive displacement (RSPD) pumps are commonly used in Oil and gas industry for pumping of mineral Lube Oil in services where they can be mechanically driven by gears coupled to a train driver. Installation of these pumps is critical and should be designed jointly by vendors and users according to project specific restrictions (i.e., the arrangement of the entire Oil circulation System). This paper describes a real case in which restrictions due to Lube Oil System arrangement have produced low pump suction head and have amplified the influence of air bubbles that remained entrained in Oil despite Lube Oil tank degassing. The investigations have been directed toward the mathematical modeling of the aeration phenomenon coupled with experimental measurements of critical parameters taken on the shop plant. Among corrective actions identified and considered there are reduction of quantity of air entering the Lube Oil System and revamping of the entire Lube Oil System with changes in piping, tank and also in pump model together with special modifications of internal path to enhance air handling capabilities. In order to validate pump behavior with reference to resistance to aeration (monitoring noise and vibration) a special simulation setup was jointly developed by end user and manufacturer on a pilot test bench to carry out the various performance tests. The numerical data collected during shop aeration test have confirmed that the pump was able to handle the expected amount of entrained air with noise and vibrations within industrial limits. The pumps tested in the pilot bench were installed at user's site and the effectiveness of the synergic corrective actions listed above was successfully verified. The study concludes that an early estimation of entrained air in the Lube Oil System is critical for design and development of either the RSPD pump or the entire Lube Oil circuit of a motor compressor train. When a critical quantity of entrained air is likely to be reached at pump suction (near 10% in volume), pump manufacturers and end users should apply some basic rules related to “design for aeration” of the pump and agree on a nonroutine test to be performed at manufacturer's shop before pump installation at site. This will serve as a reliable prediction of pump air handling capabilities, without which effective operation, reliability and durability of the pump could be jeopardized.
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design and development of a specially modified positive displacement rotary screw pump and relevant hydraulic circuit to enhance entrained air handling capability in a closed loop Lube Oil System
ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, 2013Co-Authors: Simone Berti, Pietro Fracassi, Alessandra Mattioli, Varuna Reddy Potula, Cristiano LottiAbstract:Rotary screw type positive displacement (RSPD) pumps are commonly used in Oil and Gas Industry for pumping of mineral Lube Oil in services where they can be mechanically driven by gears coupled to a train driver. Installation of these pumps is critical and should be designed jointly by vendors and users according to project specific restrictions (i.e. the arrangement of the entire Oil circulation System). This paper describes a real case in which restrictions due to Lube Oil System arrangement have produced low pump suction head and have amplified the influence of air bubbles that remained entrained in Oil despite Lube Oil tank degassing.The investigations have been directed toward the mathematical modeling of the aeration phenomenon coupled with experimental measurements of critical parameters taken on the shop plant. Among corrective actions identified and considered there are reduction of quantity of air entering the Lube Oil System and revamping of the entire Lube Oil System with changes in piping, tank and also in pump model together with special modifications of internal path to enhance air handling capabilities. In order to validate pump behavior with reference to resistance to aeration (monitoring noise and vibration) a special simulation set-up was jointly developed by end user and manufacturer on a pilot test bench to carry out the various performance tests.The numerical data collected during shop aeration test have confirmed that the pump was able to handle the expected amount of entrained air with noise and vibrations within industrial limits. The pumps tested in the pilot bench were installed at user’s site and the effectiveness of the synergic corrective actions listed above was successfully verified.The study concludes that an early estimation of entrained air in the Lube Oil System is critical for design and development of either the RSPD pump or the entire Lube Oil circuit of a motor compressor train. When a critical quantity of entrained air is likely to be reached at pump suction (near 10% in volume), pump manufacturers and end users should apply some basic rules related to “design for aeration” of the pump and agree on a non-routine test to be performed at manufacturer’s shop before pump installation at site. This will serve as a reliable prediction of pump air handling capabilities, without which effective operation, reliability and durability of the pump could be jeopardized.© 2013 ASME
G. Thangamani - One of the best experts on this subject based on the ideXlab platform.
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Generalized Stochastic Petri Nets for Reliability Analysis of Lube Oil System with Common-Cause Failures
American Journal of Computational and Applied Mathematics, 2012Co-Authors: G. ThangamaniAbstract:A very high level of availability is crucial to the economic operation of modern power plants, in view of the huge expenditure associated with their failures. This paper deals with the availability analysis of a Lube Oil System used in a combined cycle power plant. The System is modeled as a Generalized Stochastic Petri Net (GSPN) taking into consideration of partial failures of their subSystems and common-cause failures; analyzed using Monte Carlo Simulation approach. The major benefit of GSPN approach is hardware, software and human behavior can be modeled using the same language and hence more suitable to model complex System like power plants. The superiority of this approach over others such as network, fault tree and Markov analysis are outlined. The numerical estimates of availability, failure criticality index of various subSystems, components causing unavailability of Lube Oil System are brought out. The proposed GSPN is a promising tool that can be conveniently used to model and analyze any complex Systems.
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Availability analysis of a Lube Oil System using Generalized Stochastic Petri Net
2011 IEEE International Conference on Quality and Reliability, 2011Co-Authors: G. ThangamaniAbstract:This paper deals with the availability analysis of a Lube Oil System used in a combined cycle power plant. The System is modeled as a Generalized Stochastic Petri Net (GSPN) and analyzed using Monte Carlo Simulation method. The superiority of this approach over others is demonstrated. The proposed GSPN is a promising tool that can be conveniently used to model and analyze any complex Systems.
Benjamin White - One of the best experts on this subject based on the ideXlab platform.
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Mechanical Design Features of a Small Gas Turbine for Power Generation in Unmanned Aerial Vehicles
Volume 8: Microturbines Turbochargers and Small Turbomachines; Steam Turbines, 2015Co-Authors: Caleb S. Cunningham, Jason C. Wilkes, John Bishop, David Ransom, Benjamin WhiteAbstract:As part of the Intelligence Advanced Research Projects Activity (iARPA) Great Horned Owl (GHO) program, Southwest Research Institute® (SwRI®) developed and tested a small gas turbine for power generation in Unmanned Aerial Vehicles (UAV). This development program focused on advancing the state of the art in UAV power Systems by meeting key metrics in weight, fuel efficiency, and noise generation.Design, assembly, and testing of the gas turbine were completed in-house at SwRI. Fundamental mechanical design features of the gas turbine include an integrated 7 kW motor-generator, minimal Oil lubrication System, cantilevered compressor/turbine assembly, and can combustor with air-atomizing fuel nozzles. The compressor/turbine assembly is cantilevered directly off of the motor-generator shaft, which spins on hybrid ceramic bearings. Due to potential rotor natural frequencies in the design operating range, the rotor-dynamic design of this configuration was a special design challenge. The outboard rotor bearing is softly supported on O-rings to provide compliance and drive shaft natural frequencies below the operating range.The Lube Oil System is another interesting design feature of the GHO gas turbine. It is based on a minimal Oil lubrication System previously used at SwRI. The minimal Oil lubrication System relies on low Oil flow rates and cooling air to pull droplets of Oil through the bearing. The Oil passes through the machine and is consumed during combustion. This System eliminates traditional Oil recirculation hardware for simplicity and weight savings.The can combustor features a modular design and uses additive manufacturing techniques to facilitate easy and cost effective prototyping. All combustor components are manufactured from Inconel 718 using direct metal laser sintering (DMLS) with additional post-machining. These parts are particularly challenging for DMLS because of their thin walls and high aspect ratio. The custom air-atomizing fuel nozzles also highlight one of the exciting advantages of the DMLS process. Each nozzle would be difficult to machine using traditional techniques because of the tight internal flow passages; however, they are simple to construct using additive manufacturing.The GHO turbine developed by SwRI demonstrates interesting design features including a minimal Oil lubrication System, a cantilever shaft with softly supported bearing, and combustor components built using additive manufacturing techniques. This design provides a platform for further development, testing, and demonstration of small gas turbine technology for UAV power generation.Copyright © 2015 by ASME
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Mechanical Design Features of a Small Gas Turbine for Power Generation in Unmanned Aerial Vehicles
Volume 8: Microturbines Turbochargers and Small Turbomachines; Steam Turbines, 2015Co-Authors: Caleb S. Cunningham, Jason C. Wilkes, John Bishop, David Ransom, Benjamin WhiteAbstract:As part of the Intelligence Advanced Research Projects Activity (iARPA) Great Horned Owl (GHO) program, Southwest Research Institute® (SwRI®) developed and tested a small gas turbine for power generation in Unmanned Aerial Vehicles (UAV). This development program focused on advancing the state of the art in UAV power Systems by meeting key metrics in weight, fuel efficiency, and noise generation.Design, assembly, and testing of the gas turbine were completed in-house at SwRI. Fundamental mechanical design features of the gas turbine include an integrated 7 kW motor-generator, minimal Oil lubrication System, cantilevered compressor/turbine assembly, and can combustor with air-atomizing fuel nozzles. The compressor/turbine assembly is cantilevered directly off of the motor-generator shaft, which spins on hybrid ceramic bearings. Due to potential rotor natural frequencies in the design operating range, the rotor-dynamic design of this configuration was a special design challenge. The outboard rotor bearing is softly supported on O-rings to provide compliance and drive shaft natural frequencies below the operating range.The Lube Oil System is another interesting design feature of the GHO gas turbine. It is based on a minimal Oil lubrication System previously used at SwRI. The minimal Oil lubrication System relies on low Oil flow rates and cooling air to pull droplets of Oil through the bearing. The Oil passes through the machine and is consumed during combustion. This System eliminates traditional Oil recirculation hardware for simplicity and weight savings.The can combustor features a modular design and uses additive manufacturing techniques to facilitate easy and cost effective prototyping. All combustor components are manufactured from Inconel 718 using direct metal laser sintering (DMLS) with additional post-machining. These parts are particularly challenging for DMLS because of their thin walls and high aspect ratio. The custom air-atomizing fuel nozzles also highlight one of the exciting advantages of the DMLS process. Each nozzle would be difficult to machine using traditional techniques because of the tight internal flow passages; however, they are simple to construct using additive manufacturing.The GHO turbine developed by SwRI demonstrates interesting design features including a minimal Oil lubrication System, a cantilever shaft with softly supported bearing, and combustor components built using additive manufacturing techniques. This design provides a platform for further development, testing, and demonstration of small gas turbine technology for UAV power generation.Copyright © 2015 by ASME
Sandip Mehta - One of the best experts on this subject based on the ideXlab platform.
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Steam turbine Lube Oil System protections using SCADA & PLC
2017 International Conference on Intelligent Computing and Control Systems (ICICCS), 2017Co-Authors: Astha Nagar, Sandip MehtaAbstract:Steam Turbine Protection System is designed with today technology to operate the thermal power plants in safe and reliable manner. The protection System operates only when any of the control System set point parameter is exceeded, and the steam turbine will damaged if it continues to operate. This paper presents overview of the steam turbine protection logics of Lube of System and implementation for smooth automatic operation by using SIMATIC S7 PLC programming along with monitoring SCADA System by using WinCC software.
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steam turbine Lube Oil System protections using scada plc
International Conference Intelligent Computing and Control Systems, 2017Co-Authors: Astha Nagar, Sandip MehtaAbstract:Steam Turbine Protection System is designed with today technology to operate the thermal power plants in safe and reliable manner. The protection System operates only when any of the control System set point parameter is exceeded, and the steam turbine will damaged if it continues to operate. This paper presents overview of the steam turbine protection logics of Lube of System and implementation for smooth automatic operation by using SIMATIC S7 PLC programming along with monitoring SCADA System by using WinCC software.
Dennis M Russom - One of the best experts on this subject based on the ideXlab platform.
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seawater contamination of a gas turbine Lube Oil System in the u s navy
Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, 1999Co-Authors: Dennis M RussomAbstract:The Ship Service Gas Turbine Generator sets (SSGTGs) on the U.S. Navy’s DDG-51 Class ships have experienced several gas turbine engine failures resulting from seawater contamination of the Lube Oil. The seawater enters the turbine Lube Oil System after a corrosion related failure of the Lube Oil cooler. This paper examines the System design, failure mechanism, and consequence of the failure. It also discusses maintenance actions intended to minimize the possibility of cooler failures, methods that have been used to clean up contaminated Systems and alternate cooler designs that are being considered for backfit.Copyright © 1999 by ASME
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Design, Development, Testing, and Operational Experience of the Allison Model AG9130 Ship Service Gas Turbine Generator Set
Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery, 1991Co-Authors: Jack E. Halsey, Dennis M RussomAbstract:Allison has developed both an engine and a ship service gas turbine generator set (SSGTG) for use in the U.S. Navy DDG-51 destroyer program. The engine is the Model 501-K34, which uses the technology of the new generation of Allison 501 engines. The generator set is the Model AG9130, a totally self-contained package powered by the Model 501-K34. The design concepts and resulting design for the engine and generator set are provided, as well as an overview of the performance characteristics. The ship’s electrical System is discussed, and the role of the generator set in that System is defined. The design features of the generator set are given with further discussion of the main components (the engine, speed reduction gearbox, generator, base and enclosure) and the mechanical support Systems for these components (the gas turbine Lube Oil System, reduction gear/generator Lube Oil System, fuel System, seawater cooling System, starting System, bleed air System, cooling air System, fire protection System, water wash and icing detection System, and the electrical System). A review of the testing for both the engine and the SSGTG at Allison Gas Turbine and the Naval Ship Systems Engineering Station is presented. Installation and integration of the SSGTG into the ship closes the discussion.
