Author
Roberto Gabbrielli
Bio: Roberto Gabbrielli is an academic researcher from University of Pisa. The author has contributed to research in topics: Syngas & Biomass. The author has an hindex of 14, co-authored 49 publications receiving 865 citations.
Topics: Syngas, Biomass, Combined cycle, Power station, Natural gas
Papers
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TL;DR: This paper presents an advanced version of the failure mode effects and criticality analysis (FMECA), whose capabilities are enhanced; in that the criticality assessment takes into account possible interactions among the principal causes of failure.
Abstract: This paper presents an advanced version of the failure mode effects and criticality analysis (FMECA), whose capabilities are enhanced; in that the criticality assessment takes into account possible interactions among the principal causes of failure. This is obtained by integrating FMECA and Analytic Network Process, a multi-criteria decision making technique. Severity, Occurrence and Detectability are split into sub-criteria and arranged in a hybrid (hierarchy/network) decision-structure that, at the lowest level, contains the causes of failure. Starting from this decision-structure, the Risk Priority Number is computed making pairwise comparisons, so that qualitative judgements and reliable quantitative data can be easily included in the analysis, without using vague and unreliable linguistic conversion tables. Pairwise comparison also facilitates the effort of the design/maintenance team, since it is easier to place comparative rather than absolute judgments, to quantify the importance of the causes of failure. In order to clarify and to make evident the rational of the final results, a graphical tool, similar to the House of Quality, is also presented. At the end of the paper, a case study, which confirms the quality of the approach and shows its capability to perform robust and comprehensive criticality analyses, is reported. Copyright © 2011 John Wiley and Sons Ltd.
117 citations
TL;DR: In this paper, a new tool for failure mode and effect analysis developed for a new Integrated Gasification and Combined Cycle plant in an important Italian oil refinery is presented, based on the integration between a modified Failure Mode Effect and Criticality Analysis (FMECA) and a Monte Carlo simulation as a method for testing the weights assigned to the measure of the risk priority numbers (RPNs).
Abstract: This paper presents a new tool for failure mode and effect analysis developed for a new Integrated Gasification and Combined Cycle plant in an important Italian oil refinery. The methodology is based on the integration between a modified Failure Mode Effect and Criticality Analysis (FMECA) and a Monte Carlo simulation as a method for testing the weights assigned to the measure of the risk priority numbers (RPNs). The RPN proposed consists of a weighted sum of six parameters (safety, machine importance for the process, maintenance costs, failure frequency, downtime length, and operating conditions) multiplied by a seventh factor (the machine access difficulty). Adopting this tool and considering the budget constraints, the best maintenance policy has been selected for each plant facility (about 140 in total). Copyright © 2000 John Wiley & Sons, Ltd.
104 citations
TL;DR: In this article, a novel design approach for small scale low enthalpy binary geothermal power plants is proposed, where the design temperature of the geothermal resource is selected between its highest and lowest values, that correspond to the beginning and the end of the operative life of the generator, respectively.
94 citations
TL;DR: In this paper, the exact size of the vessel and insulation layers and the shape of the roof are optimized by minimizing the total investment cost of the storage system under three technical constraints: remaining within the maximum allowable values of both temperature and stress in the steel structure, and avoiding excessive cooling and consequent solidification of the molten salt during long periods of no solar input.
Abstract: This paper presents an optimal design procedure for internally insulated, carbon steel, molten salt thermal storage tanks for parabolic trough solar power plants. The exact size of the vessel and insulation layers and the shape of the roof are optimized by minimizing the total investment cost of the storage system under three technical constraints: remaining within the maximum allowable values of both temperature and stress in the steel structure, and avoiding excessive cooling and consequent solidification of the molten salt during long periods of no solar input. The thermal, mechanical and economic aspects have been integrated into an iterative step-by-step optimization procedure, which is shown to be effective through application to the case study of a 600 MW h thermal storage system. The optimal design turns out to be an internally insulated, carbon steel storage tank characterized by a maximum allowable height of 11 m and a diameter of 22.4 m. The total investment cost is about 20% lower than that of a corresponding AISI 321H stainless steel storage tank without internal protection or insulation.
81 citations
TL;DR: In this paper, a zero-dimensional simulation model for a full-scale woody biomass gasification plant with fixed-bed downdraft gasifier has been developed using Aspen Plus.
56 citations
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TL;DR: In this article, a review of thermal energy storage system design methodologies and the factors to be considered at different hierarchical levels for concentrating solar power (CSP) plants is presented.
1,031 citations
TL;DR: This research provides evidence that the integrated AHPs are better than the stand-alone AHP, but also aids the researchers and decision makers in applying the integratedAHPs effectively.
993 citations
TL;DR: This study reviewed 75 FMEA papers published between 1992 and 2012 in the international journals and categorized them according to the approaches used to overcome the limitations of the conventional RPN method.
Abstract: Failure mode and effects analysis (FMEA) is a risk assessment tool that mitigates potential failures in systems, processes, designs or services and has been used in a wide range of industries. The conventional risk priority number (RPN) method has been criticized to have many deficiencies and various risk priority models have been proposed in the literature to enhance the performance of FMEA. However, there has been no literature review on this topic. In this study, we reviewed 75 FMEA papers published between 1992 and 2012 in the international journals and categorized them according to the approaches used to overcome the limitations of the conventional RPN method. The intention of this review is to address the following three questions: (i) Which shortcomings attract the most attention? (ii) Which approaches are the most popular? (iii) Is there any inadequacy of the approaches? The answers to these questions will give an indication of current trends in research and the best direction for future research in order to further address the known deficiencies associated with the traditional FMEA.
666 citations
Book•
01 Jan 1985
TL;DR: The Shingo One-Touch Die Exchange System (SMED) as discussed by the authors is a Boltless Method (Boltless Method) for die exchange that uses the Boltless method to exchange dies.
Abstract: Publisher's Preface Foreword Introduction PART ONE: THEORY AND PRACTICE OF THE SMED SYSTEM 1. The Structure of Production 2. Setup Operations in the Past 3. Fundamentals of SMED 4. Techniques for Applying SMED 5. Applying SMED to Internal Operations 6. Basic Examples of SMED 7. Effects of SMED PART TWO: THE SMED SYSTEM -- CASE STUDIES 8. Implementing SMED Matsushita Electric Industrial Co., Ltd., Washing Machine Division (Mikuni Plant) 9. Setup Improvements Based on the Toyota Production System Toyoda Gosei Co., Ltd. 10. A Quick-Setting ("Q-S") Campaign Nippon Kogaku K.K. (Oi Plant) 11. Using SMED on a Farm Machinery Processing Line Kubota, Ltd. (Sakai Plant) 12. Setup Improvements Based on Shop Circle Activities Toyota Auto Body Co., Ltd. 13. Comprehensive Development of the SMED Concept to Include Affiliated Plants Arakawa Auto Body Industries K.K. 14. SMED Developments in Producing Slide Bearings T.H. Kogyo K.K. 15. Examples and Effects of the SMED System Glory Industries K.K. 16. Achievement of SMED Through Company-Wide Activities Kyoei Kogyo K.K. 17. SMED in Tire Manufacturing Processes Bridgestone Tire Co., Ltd. 18. Using SMED for Aluminum Die-Casting Dies Tsuta Machine and Metals Co., Ltd. 19. The Shingo One-Touch Die Exchange System: The Boltless Method Postscript About the Author Index
348 citations
TL;DR: In this article, the potential for low-grade heat recovery with regard to new incentives and technological advances is discussed, and different aspects which influence the decision making for low grade heat recovery in the process industry are discussed.
309 citations