The Experts below are selected from a list of 240 Experts worldwide ranked by ideXlab platform
R. Seshadri - One of the best experts on this subject based on the ideXlab platform.
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Fitness-for-Service Assessment of Hydrocarbon Storage Tanks
Journal of Pressure Vessel Technology-transactions of The Asme, 2010Co-Authors: Forhad Ahmad, M. M. Hossain, R. SeshadriAbstract:Storage tanks are widely used in the industry to store hydrocarbon products. Corrosion damage is considered to be a serious threat to the structural integrity of the industrial storage tanks if it occurs on the primary Pressure Containment boundary. Therefore, fitness-for-service (FFS) assessment of these structures is performed periodically in order to ensure the operational safety and structural integrity. In this paper, evaluation methods are proposed for FFS assessment of storage tanks undergoing corrosion damage. The proposed methods are shown to give reasonably accurate and conservative assessment of the remaining strength factor. The methods are demonstrated through an example and the results are verified by inelastic finite element analysis.
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Fitness-for-Service Assessment of Hydrocarbon Storage Tanks
ASME 2010 Pressure Vessels and Piping Conference: Volume 2, 2010Co-Authors: Forhad Ahmad, M. M. Hossain, R. SeshadriAbstract:Storage tanks are widely used in the industry to store hydrocarbon products. Corrosion damage is considered to be a serious threat to the structural integrity of the industrial storage tanks if it occurs on the primary Pressure Containment boundary. Therefore, fitness-for-service (FFS) assessment of these structures is performed periodically in order to ensure the operational safety and structural integrity. In this paper, evaluation methods are proposed for FFS assessment of storage tanks undergoing corrosion damage. The proposed methods are shown to give reasonably accurate and conservative assessment of the remaining strength factor. The methods are demonstrated through an example and the results verified by inelastic finite element analysis.Copyright © 2010 by ASME
Yassin A. Hassan - One of the best experts on this subject based on the ideXlab platform.
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Numerical analysis of 1/28 scaled NGNP HTGR reactor building test facility response to depressurization event using GOTHIC
Annals of Nuclear Energy, 2018Co-Authors: Mustafa Alper Yildiz, Ro Yang, Rodolfo Vaghetto, Yassin A. HassanAbstract:Abstract A depressurized loss of forced cooling (DLOFC) accident is an important type of accident scenario in high temperature gas reactor (HTGR) design, which is initiated by a break in the helium Pressure boundary (HPB). This class of accident scenarios results in a depressurization of the primary helium coolant system with the subsequent release of helium into the reactor building (RB) and the atmosphere through vented low Pressure Containment (VLPC). After the total depressurization of helium, depending on the specific accident scenarios, it is also possible that air enters into the reactor Pressure vessel (RPV) through the RB, which can potentially react with fuel and other nuclear-grade graphite components. In this study, generation of thermal hydraulic information in Containments (GOTHIC) model of a 1/28-scaled simplified test facility was developed to analyze the depressurization scenarios and validate them against experimental data. Natural leakage from the test facility was modeled using two different methods. The post-depressurization refill of air into the test facility compartments along with two hypothetical depressurization scenarios were analyzed and compared with experimental data. In general, simulation results were observed to be consistent with the experimental data.
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Experimental study on 1/28 scaled NGNP HTGR reactor building test facility response to depressurization event
Annals of Nuclear Energy, 2018Co-Authors: Ro Yang, Ethan Kappes, Thien Nguyen, Rodolfo Vaghetto, Yassin A. HassanAbstract:Abstract The analysis and understanding of air ingress events are an important aspect of the design of high-temperature gas-cooled reactor (HTGR) accident scenarios. These include depressurized loss of forced cooling (D-LOFC) events that allow for the possibility of air ingress into the reactor Pressure vessel as a result of a break in the helium Pressure boundary, which can ultimately result in oxidation of the fuel elements and other nuclear-grade graphite components. To characterize air ingress into the vented low-Pressure Containment of the next generation nuclear plant HTGR during hypothetical moderate-sized D-LOFC break accidents experimentally, a 1/28 scaled simplified reactor building model was established. A non-dimensional similarity approach was employed for scaling of the experimental facility. Three experiments were designed and conducted to study the dynamic response to the accident scenario. The experimental results suggest an increment in the flow area of the check valve between the reactor cavity (CV1) and steam generator cavity (CV3). Furthermore, qualitative analysis was conducted on the experimental data.
Forhad Ahmad - One of the best experts on this subject based on the ideXlab platform.
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Fitness-for-Service Assessment of Hydrocarbon Storage Tanks
Journal of Pressure Vessel Technology-transactions of The Asme, 2010Co-Authors: Forhad Ahmad, M. M. Hossain, R. SeshadriAbstract:Storage tanks are widely used in the industry to store hydrocarbon products. Corrosion damage is considered to be a serious threat to the structural integrity of the industrial storage tanks if it occurs on the primary Pressure Containment boundary. Therefore, fitness-for-service (FFS) assessment of these structures is performed periodically in order to ensure the operational safety and structural integrity. In this paper, evaluation methods are proposed for FFS assessment of storage tanks undergoing corrosion damage. The proposed methods are shown to give reasonably accurate and conservative assessment of the remaining strength factor. The methods are demonstrated through an example and the results are verified by inelastic finite element analysis.
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Fitness-for-Service Assessment of Hydrocarbon Storage Tanks
ASME 2010 Pressure Vessels and Piping Conference: Volume 2, 2010Co-Authors: Forhad Ahmad, M. M. Hossain, R. SeshadriAbstract:Storage tanks are widely used in the industry to store hydrocarbon products. Corrosion damage is considered to be a serious threat to the structural integrity of the industrial storage tanks if it occurs on the primary Pressure Containment boundary. Therefore, fitness-for-service (FFS) assessment of these structures is performed periodically in order to ensure the operational safety and structural integrity. In this paper, evaluation methods are proposed for FFS assessment of storage tanks undergoing corrosion damage. The proposed methods are shown to give reasonably accurate and conservative assessment of the remaining strength factor. The methods are demonstrated through an example and the results verified by inelastic finite element analysis.Copyright © 2010 by ASME
S Furtado - One of the best experts on this subject based on the ideXlab platform.
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Safety level on different offshore pipeline design criteria: A comparison between dnv-os-f101 and api rp-1111 codes
2016 11th International Pipeline Conference IPC 2016, 2016Co-Authors: Luca Dangelo, H M Thorsen, Olav Fyrileiv, Leif Collberg, S FurtadoAbstract:Submarine pipelines are more often than before required to operate in harsh environments, especially for systems deployed in ultra-deep water. In order to minimize the installation tension due to the hanged section, they are installed empty and therefore the external Pressure is often the prime load parameter for the design. New discoveries and associated technical challenges have generated important research and development endeavors in a wide range of disciplines in order to improve efficiency and reliability, but also keeping the risks associated with the new scenarios within an acceptable range. Some aspects that can be mentioned include, for instance, steel line grade improvements and manufacturing innovations of pipe products; more powerful lay vessels and development of new pipeline installation methods; determination of the mechanical behavior and the expected failure modes of concern for deep and long pipelines under combined loads; and the improved different design criteria like the DNV-OS-F101 (1) and API RP-1111 (2) codes. The intention of this paper is to review and compare three different pipeline design criteria well established in the oil and gas industry. The pipeline wall thickness design for pipe Pressure Containment (bursting), local buckling (system collapse) and propagating buckling for DNV-OS-F101 (1) and API RP-1111 (2) are discussed as well as the parameters used, definitions, safety philosophy and code limitations. A pipeline example is used to illustrate and compare the results. © Copyright 2016 by ASME.
F.a. Silady - One of the best experts on this subject based on the ideXlab platform.
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A vented low Pressure Containment strategy for the Modular High Temperature Gas-Cooled Reactor (MHTGR)
1994Co-Authors: D.a. Dilling, T.d. Dunn, F.a. SiladyAbstract:This paper presents the response of the 450 MW(t) MHTGR with a steam turbine power conversion system to expected and hypothetical accident source term assumptions. A range of vented low Pressure Containment (VLPC) strategies was considered that would enhance the retention of radionuclides. This study was prepared to review the technical merits of VLPC options in response to an NRC request during preapplication review of the steam cycle MMGR. The study found that, even under arbitrary hypothetical assumptions regarding significantly lower than expected fuel performance, vented low Pressure Containment options can effectively reduce accident doses. The reference design with a VLPC meets the 10CFR100 and prompt fatality doses even with lower than expected fuel performance. Alternative VLPC designs were studied which could be used to augment the current design to provide additional margin.