Thematische Bibliographien / Piping route

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Auswahl der wissenschaftlichen Literatur zum Thema „Piping route“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 1. Februar 2022

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Zeitschriftenartikel zum Thema "Piping route"

Li, Xiaodan, Zhongfu Li und Guangdong Wu. „Modular and Offsite Construction of Piping: Current Barriers and Route“. Applied Sciences 7, Nr. 6 (26.05.2017): 547. http://dx.doi.org/10.3390/app7060547.

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Yamada, Yasuyoshi, und Yoshinobu Teraoka. „One Method of Optimum Design for Piping Route in CAD System.“ Transactions of the Japan Society of Mechanical Engineers Series C 61, Nr. 591 (1995): 4542–48. http://dx.doi.org/10.1299/kikaic.61.4542.

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OBARA, Shin'ya, und Kazuhiko KUDO. „Route Planning of Heat Supply Piping of Fuel Cell Energy Network“. Transactions of the Japan Society of Mechanical Engineers Series B 71, Nr. 704 (2005): 1169–76. http://dx.doi.org/10.1299/kikaib.71.1169.

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Wardhani, Veronica Indriati Sri, Henky Poedjo Rahardjo und Rasito Tursinah. „ROUTING DESIGN ON THE PRIMARY COOLING PIPING SYSTEM IN PLATE-TYPE CONVERTED TRIGA 2000 REACTOR BANDUNG“. JURNAL TEKNOLOGI REAKTOR NUKLIR TRI DASA MEGA 21, Nr. 3 (05.11.2019): 107. http://dx.doi.org/10.17146/tdm.2019.21.3.5603.

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In 2015, research activities to modify TRIGA 2000 Reactor Bandung fuel element from cylindrical to plate-type have been initiated. By using plate-type fuel elements, core cooling process will be altered due to different generated heat distribution. The direction of cooling flow is changed from bottom-to-top natural convection to top-to-bottom forced convection. This change of flow direction requires adjustment on the cooling piping system, in order to produce simple, economical, and safe piping route. This paper will discuss the design of suitable piping routing based on pipe stress and N-16 radioactivity. The design process was carried out in several stages which include thermal-hydraulic data of reactor core to determine the process variables, followed by modeling various pipeline routes. Based on available space and ease of manufacture, four possible alternative routings were determined. Four routings were produced and analyzed to minimize the amount of N-16 radioactivity on the surface of the reactor tank, prolonging the cooling fluid travel time to reach at least five times of N-16 half-life. Subsequent pipe stress analysis using CAESAR II software was conducted to ensure that the piping system will be able to withstand various loads such as working fluid load, pipe weight, along with working temperature and pressure. The results showed that the occurred stresses were still below the safety limit as required in ASME B31.1 Code, indicated that the designed and selected pipeline routing of primary cooling system in the Plate-type Converted TRIGA 2000 Reactor Bandung has met the safety standards.Keywords: TRIGA reactor, Cooling system modification, Pipeline routing design, Pipe stress analysis, N-16 radioactivity

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OBARA, Shin'ya, und Kazuhiko KUDO. „Route Planning of Heat Supply Piping in a Fuel Cell Energy Network“. Journal of Environment and Engineering 1, Nr. 1 (2006): 17–28. http://dx.doi.org/10.1299/jee.1.17.

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Ogawa, N., T. Mikoshiba und C. Minowa. „Hydraulic Effects on a Large Piping System During Strong Earthquakes“. Journal of Pressure Vessel Technology 116, Nr. 2 (01.05.1994): 161–68. http://dx.doi.org/10.1115/1.2929570.

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Liquid in a large piping system could become a resonance column under axial excitations. A 1000-m long closed-boundaries pipeline with pressure wave propagation velocity of 1000 m/s would have the fundamental liquid resonance frequency of 0.5 Hz. Then, some hydraulic transients might occur during strong earthquakes. If dynamic pressure amplitude exceeds the value of system stationary pressure, then vaporizing at negative pressure, and after that, cavity or liquid column separation and reconnection can be produced. One of the effects of these behaviors would be equivalent damping of dynamic response, and the other an impact force on pipe structural system. The latter effect is considered as one of potential damage factors of a large liquid piping system. In this paper, an analytical method of earthquake-induced hydraulic transients of piping system is applied to a real underground large piping system subjected to a strong earthquake motion which has occurred in Japan. The results of the analysis have shown that the occurrence of earthquake-induced negative pressure in liquid column is possible. Further, the analysis has explained the difference between two long straight pipelines buried in the same route, one failed by axial cracking and the other had no damages.

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Yamada, Y., und Y. Teraoka. „An optimal design of piping route in a CAD system for power plant“. Computers & Mathematics with Applications 35, Nr. 6 (März 1998): 137–49. http://dx.doi.org/10.1016/s0898-1221(98)00025-x.

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Reckinger, Shanon, Joseph Bocchino, Andrew Jackowitz und John Perry. „Rainwater Harvesting for Campus Student Center: A Sustainable, Community-Orientated Senior Design Project“. International Journal for Service Learning in Engineering, Humanitarian Engineering and Social Entrepreneurship 9, Nr. 1 (30.04.2014): 117–37. http://dx.doi.org/10.24908/ijsle.v9i1.5288.

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A team of three mechanical engineering senior undergraduate students and one faculty member designed and installed a rainwater harvesting system in the University’s student center. After an extensive analysis of the piping system, the team was able to use existing rain leaders and piping to move all the rainwater from the third floor patio to a mechanical room located on the first level of the building. In the mechanical room, the piping system was redesigned to route the collected water into a large storage tank. From the tank, the rainwater was pumped into the irrigation line and used to water a large portion of the campus lawns and greenery. In addition, the system incorporated an overflow feature, a drainage line, a new pump, a flow meter to track water usage (which was previously never tracked at the University), a design where regular flushing of the system is automatic, and a maintenance plan. The harvested rainwater could also potentially be used to fill up the University watering trucks to water the flowers, shrubs, and greenery that covers the 200-acre campus. Students found that this community-based project opened their eyes to sustainability, the environment, and was rewarding work.

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HASHIMOTO, Shin-ichiro, Yukio EMOTO, Takeshi WATANABE und Chikanori HASHIMOTO. „INFLUENCE OF PIPING ROUTE AND MEASUREMENT CONDITIONS ON THE SIMPLE EVALUATION OF CONCRETE PUMPABILITY“. Cement Science and Concrete Technology 68, Nr. 1 (2014): 268–74. http://dx.doi.org/10.14250/cement.68.268.

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Ito, Teruaki, und Shuichi Fukuda. „Hybrid Approach to Piping Route Path Design Using GA-Based Inspiration and Rule-Based Inference“. Concurrent Engineering 6, Nr. 4 (Dezember 1998): 323–32. http://dx.doi.org/10.1177/1063293x9800600405.

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Dissertationen zum Thema "Piping route"

Ošťádal, Michal. „Návrh čerpadla a potrubní trasy pro zajištění vyšší bezpečnosti jaderné elektrárny“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443200.

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The main goal of the diploma thesis is to design the hydraulic part of the new piping system, which is added to the existing project of the Dukovany Nuclear Power Plant. At the beginning of the work is theoretical basis for the design of the hydraulic part. The next part is the selection of piping material for aggressive refrigerant with subsequent verification of the pipe wall thickness. The piping system is designed with specific components from the companies SIGMA GROUP a.s., ARAKO spol. s.r.o. and ARMATURY Group a.s. In the last part, hydraulic solution is developed and commented using the excel program. The piping system is processed into the drawing documentation including bill of materials.

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KUO, CHI CHOU, und 郭啟洲. „Study on the Automatic Piping Route System for 3-D Piping Arrangement“. Thesis, 1999. http://ndltd.ncl.edu.tw/handle/98891590212474970053.

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碩士
國立成功大學
造船及船舶機械工程學系
87
The role of piping in a thermal or nuclear power plant is important, and the design and manufacture of the piping have a large influenceon the quality and cost of the production. Recently, systematiuation has been established in almost all parts of piping design,due to the rapid progress of CAD, which has become indispensable for design and manufacture working. However, automatic design of piping routes has not yet been established because of that arrangement of the piping appears to be the most difficult of the remaining design tasks to computerize. CAD systems presently used generally contains data concerning shape and position of the pipelines, equipment, and structures. This total model is represented by the graphs for the applications from the methematical model. By the matrices using, the routing map was established with the collision detect, and will to be count in shorstest path finding. It is desired to route a pipe from a specified inlet to a specified outletin a three-dimensional space, avoiding interferences with anything equiped in the space. And the problem was solved by the use of dynamic programing.

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Horng, Wen-kong, und 洪文恭. „Pipe-Trunk Based Piping Route Design Automation in Engine Room Preliminary Design Process“. Thesis, 2008. http://ndltd.ncl.edu.tw/handle/48441687457173604364.

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碩士
國立高雄海洋科技大學
輪機工程研究所
96
A pipe route design automation method, called Pipe Trunk Based Pipe Routing Design Method (PTR Method), has been developed to allow new pipes to pass through pipe trunks and connect a pair of source and destination points specified by engineers in the engine room piping system design processes of a ship. In the PTR Method, a pipe trunk is defined by a line segment with high-bound and low-bound width limits. A spatial, breadth-first search method has been developed to search the pipe trunk paths connecting a pair of source and destination pipe trunks. Pipe sliders are used to book-keeping the existing and new pipes in pipe trunks. Edge-Operators have been developed to determine the geometry of the pipes connecting pipe trunks following shipyard’s pipe design standards. The PDMS input files of the new pipe routes can be generated automatically, and the CAD solid models of the new pipe routes can be added to the engine room model for engineers to select preferred routes. The application of the PTR Method is for most engine room spaces except the main floor where most pipes are not in pipe trunks. The advantages of using PTR Method include (1) forcing the engine room pipes to be arranged in predefined pipe trunks, (2) generating the CAD solid models of the pipes automatically, (3) reducing the chance to have pipes interfere with other entities, and (4) pipe routes searched are independent of the arrangement of manufacturing blocks of the ship.

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Candy und 林育君. „Route Free-Fall Scheme of Surface Routing Method for Piping System Layout in Rectangular Spaces“. Thesis, 2004. http://ndltd.ncl.edu.tw/handle/66193196832162028764.

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碩士
國立高雄海洋科技大學
輪機工程研究所
92
This research developed a piping system design method, called Surface Routing Method (SRM), to automatically determine pipe routes along the bounding surfaces of rectangular spaces such as a plant or engine room. These pipe routes serve as the centerlines of the straight pipes in pipe assemblies in the design. Initially, the routing design method (SRM) uses the Orthogonal Routing Method to layout reference routes for a new pipe assembly. If the route segments are away from the bounding surfaces of the space, the route segments cannot be used to layout the pipe assembly. A route free-fall scheme has been developed to move the route segments of the reference routes to the bounding surfaces, such that it is feasible to layout pipe assemblies according to the routes. There are three levels of free-fall for general cases. Falling Priority Rules have been developed to select free-fall directions and determine the falling distances. A C++ computer program has been developed for the free-fall scheme and the Surface Routing Method. The computer program can automatically find 12 pipe routes for piping system design engineers to layout a pipe assembly that connects a pair of source and destination points. From the total pipe length and the total number of elbows calculated by the computer program for each feasible pipe assembly route, engineers can select the most economic route to design the pipe assembly. The free-fall scheme developed has been explained and tested by examples. This research work (1) makes the automation of surface routing of piping system design feasible and (2) can reduce the piping system design duration.

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Li, Chih-Yen, und 李志彥. „A Study of on Determining Short-Cut Pipe Routes for Elbow-Cluster Regions in Piping Systems“. Thesis, 2010. http://ndltd.ncl.edu.tw/handle/12251499690649395674.

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碩士
國立高雄海洋科技大學
輪機工程研究所
98
Abstract This research has developed a method to determine a short-cut pipe route for elbow-cluster problems which are often observed in the pipe routes constructed by piping design automation methods. The main research work completed in the research includes defining the elbow-clustering condition, developing the criteria to identify elbow-cluster regions in pipe assemblies based on the minimum pipe length and cone concepts, developing a method to construct a short-cut pipe route for an identified elbow-cluster region, and two demonstration examples. The single criterion to identify an elbow-cluster region in a pipe assembly is the minimum length of the pipe segment. The replacement pipe route or the short-cut pipe route of a known elbow cluster region is mostly an assembly of elbow-elbow or elbow-bed, which are suitable for pipe nominal diameters no greater than 200. For pipes with nominal diameter over 250, elbow-elbow connection must be used. Two relative orientation configurations, parallel and perpendicular, between the pipe segments connecting with the cluster region have been considered, when determining the short-cut pipe route. The short-cut pipe route makes the piping system more smooth, which can be observed from the reduction in pressure loss. Computerizing the short-cut route determination method developed in this research can improve the quality of the pipe route determined by using pipe design automation methods.

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Buchteile zum Thema "Piping route"

Ito, Teruaki. „Piping layout wizard: Basic concepts and its potential for pipe route planning“. In Lecture Notes in Computer Science, 438–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/3-540-64582-9_774.

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Sperber, Daniel. „Water Supply, Sewage, and Drainage“. In The City in Roman Palestine. Oxford University Press, 1999. http://dx.doi.org/10.1093/oso/9780195098822.003.0013.

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It is well known that Erez Yisrael was not blessed with a plentiful supply of water. Other than the narrow winding Jordan, there are few rivers in the country and hardly any fresh water lakes, other than the Sea (!) of Galilee and Huleh Lake (which virtually no longer exists). Consequently, the cities, which required an abundant and regular flow of water, relied mostly on wells and on rainwater trapped in numerous small private and public cisterns. Fountains (springs) might have been situated at considerable distances from the city, and water would have been transported via an open canal (such as in present-day Wadi Kelt between Jerusalem and Jericho), through a closed piping system, which sometimes spanned hills and valleys for many miles, or by aqueducts (such as those near Caesarea). There were also large underground water systems with vent pipes surfacing at regular intervals to relieve water and air pressure and to enable workers to inspect and clear out the silt deposits and other obstructions (witness the magnificent complex bringing water to Jerusalem through the adjacent Armon ha-Naẓiv). There were also overhead pipes made of lead, earthenware, or at times even wood that were laid out carefully above ground, taking advantage of the lay of the land and using gravitational force to transport water over a great distance from a source high in the hills to a city situated low on the plains. Such piping systems required considerable sophistication in planning and construction, not only in choosing optimal routes but also in calculating water pressures and the strengths and diameters of piping units, in placing air vents to relieve excessive pressure, and in installing sludgecocks for removing silt deposits and for filtering the water. A detailed description of different water-supply systems can be found in the work of the great first century C.E. Roman architect Vitruvius in his De Architectura.

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Konferenzberichte zum Thema "Piping route"

Ito, Teruaki, und Shuichi Fukuda. „Piping Route Path Planning Using Genetic Algorithm“. In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/eim-3725.

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Abstract With the increasing diversity of personal preferences for products, the conventional style of design using a series of consecutive procedures is inadequate to create designs that satisfy those preferences under the frequent changes of requirements in design specifications. Under these circumstances, conceptual design plays a key role to comply with those preferences and requirements, and to shorten the lead time in product development. This is also true in the domain of piping layout design, where a designer makes design in a trial-and-error way to comply with the requirements frequently changed in specification until the final design is formulated. The paper describes an approach of piping route path planning using genetic algorithm (GA). Optimization technique of GA generates a preliminary route path through evolution of genes which represent the piping route path. A designer evaluates the route path, modifies it, and repeats the procedure until the appropriate path is designed. In this way, a designer can interactively proceed the layout of piping in a collaborative manner using a design support system. The paper shows the procedure of the method and some results of simulation.

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Ozmaian, Javad, und Amir H. Farzaneh. „Relation B/W Stress, Nozzle Load and Total Length in a Process Piping Line“. In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25213.

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Nowadays, time saving in piping stress analysis is a major concern among consultant engineering companies in power and process plants. In this paper, we are going to have a quantity review between some important parameters such as sustained, occasional and expanding stresses with total length and nozzle load of a real case according to ASME B31.3. Most of the times, piping stress designers try different and more flexible piping routes completely arbitrary. Longer piping route means greater mass, and it means a big trouble in earthquake time especially for allowable nozzle loading, on the other hand shorter piping route increases thermal nozzle loading and operating stresses. We will try to find a relationship among mentioned parameters to have an optimal piping route in order to save time and material. Finally, different routes will be analyzed using Caesar II to plot related parameters and find optimum criterion.

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Hong, Bingyuan, Xiaoping Li, Yu Li, Jingjing Gao, Yanhong Zhou, Baocheng Wei, Siqi Zhang und Jing Gong. „Application of Genetic Algorithm on Optimal Pipeline Route Considering Complex Terrains and Obstacles“. In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84272.

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Gathering network, which is usually characterized by various and complex structure, takes a large proportion of the overall construction cost of gas field. Optimization of pipeline routes is an effective way to reduce the investment. In this paper, a novel model for optimal route of pipeline considering complex terrains and obstacles is proposed and solved by Genetic Algorithm. Minimizing the total investment is the object of this model. Since the construction costs under different terrains are different, the distance factor Li, slope factor Di and elastic factor Si are introduced into the objective function to represent the length of the pipeline, the gradient of the pipeline, and the fluctuation of terrain. In addition, the performance of the model is verified by taking three typical situations of different terrains and obstacles as examples. The results illustrate that the proposed model can address the optimal design of pipeline routes in complex terrains. Moreover, the effects of different genetic operators on solutions are investigated, including three selection operators and two crossover operators. The study provides a guideline for designing pipeline routes in complex terrains and is also applicable to the analogous problem.

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Connolly, Kevin J., und Elena Kalinina. „Unit Dose Factors for Transportation of Radioactive Materials“. In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45872.

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It will be necessary in the future to transport spent nuclear fuel on a large-scale basis from nuclear power plant sites to interim storage and/or a repository. Shipments of radioactive material are required to comply with regulations limiting the dose rate to no more than 0.1 mSv (10 mrem) per hour at 2 meters from the sides of the vehicle transporting the package. Determining the resulting dose to the public will be necessary for a number of reasons (e.g., stakeholder concerns, environmental impact statements). In order to understand the dose consequence of such a transportation system, this paper describes a method for determining unit dose factors. These are defined as the dose to the public per unit distance traveled along a road, rail, or waterway from one shipment assuming unit values for the other route specific parameters. The actual dose to the public is calculated using unit dose factors, the dose rate due to the radiation field emanating from the package, and characteristics of the route itself. Route specific parameters include the speed of the conveyance, the population density, and characteristics of the environment surrounding the route; these are provided by a routing tool. Using these unit dose factors, in conjunction with a routing tool, it will be possible to quantify the collective dose to the public and understand the ramifications of choosing specific routes.

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Jonsson, Magnus Thor, und Lilja Magnusdottir. „Minimizing Visual Effects and Optimizing Routes and Locations for Geothermal Steam Gathering System“. In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65997.

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In geothermal power plants, the steam system is a costly component of the infrastructure in terms of construction requirements. The steam system consists of geothermal wells, well head equipment, pipelines and separators connecting wells to the separators and the separators to the power plant. This paper describes an approach for optimum design of a steam system, with focus on topology and route selection for pipelines transporting two-phase fluid from geothermal wells to a separation station and single-phase pipelines from the separator stations to the power plant. This article proposes a new approach for selecting the locations of the separators and power plant and routes for both two phase-flow and single-phase flow pipelines in a geothermal steam gathering system. Multiple weighted distance maps calculated by uniform cost Dijkstra’s algorithm are used to find the optimum location of a site for a steam separator based on the flow capacity of geothermal wells. The two-phase flow routes are monotonic and the incline is slight in order to minimize the pressure drop and the slug flow conditions in the pipeline. Once the location of separators has been optimized, the optimum location of the power plant can be determined based on the route selection for both the pipelines transporting steam to the power plant and the pipelines transporting the used geothermal fluid from the power plant to the injection wells. The objective is to minimize both cost and visual effects. A comparison of this method to traditional methods shows that when the method described in this paper is used, shorter routes and cheaper systems can be designed with less environmental impact.

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May, S., S. Bate, M. Chevalier und D. Dean. „Overview of EASICS Weldment Assessment Route Development Through Inelastic Analysis“. In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21717.

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Abstract Structural integrity assessment of weldments within metal structures is key to substantiate any nuclear reactor design. The assessment of weldments should consider the localised strain enhancement due to weldment geometry and material mismatch. For high temperature plant designs (operating within the creep regime), R5 Volume 2/3 Appendix A4 provides a procedure for the assessment of creep-fatigue initiation in austenitic and ferritic steel weldments, which accounts for the associated strain enhancement using a Weld Strain Enhancement Factor (WSEF). The current austenitic Type 1 WSEFs in R5 Volume 2/3 have been defined by data attained primarily for plate butt weldments under applied bending loads, and this factor is used for all butt weldments. It has been proposed that the weld strain enhancement may be dependent on loading, geometric and material mismatch conditions, and that adopting a single factor in an assessment may introduce varying levels of conservatism, which are unquantified. This work has included reviewing the current R5 Type 1 WSEF against existing validation data, previous inelastic Finite Element Analysis (FEA) studies and the use of inelastic material models in the FEA of weldments subject to cyclic loading.

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Eren, S¸efika Elvin, Isabel Hadley und Kamran Nikbin. „Differences in the Assessment of Plastic Collapse in BS 7910:2005 and R6/FITNET FFS Procedures“. In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57255.

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At present within the fracture assessment routes of different codes and standards, two different options for the assessment of plastic collapse, Lr, are available, namely reference stress and limit load approaches. Recent comparative studies have shown significant differences in the assessment of plastic collapse depending on whether the reference stress solutions in BS 7910:2005 or the limit load solutions in R6/FITNET are used for the calculation of Lr. In this paper, differences with respect to the choice of solutions and boundary conditions will be illustrated and observations regarding the route that the Codes should take with respect to a unified assessment will be discussed.

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Nguyen, Hai, Dong-Joon Kim und Jianke Gao. „3D Piping Route Design Including Branch and Elbow Using Improvements for Dijkstra's Algorithm“. In 2016 International Conference on Artificial Intelligence: Technologies and Applications. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icaita-16.2016.76.

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Rauscher, Franz. „Design by Analysis: Direct Route for Cases With Pressure and Thermal Action“. In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-94027.

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This paper focuses on the usage of Direct Route for Design by analysis (DBA), which is included in the new European standard for unfired pressure vessels (EN 13445-3 [1]). The Direct Route addresses failure modes directly, having, therefore, advantages in comparison to the traditional method, which is stress categorization. Special attention is given to the Progressive Plastic Deformation design check (PD-DC) with space and time-dependent temperature distribution and the Fatigue design check (F-DC) with stress components which do not vary simultaneously. As a simple demonstration example, a nozzle with cold media injection is used to show how the Direct Route can be applied in such cases. This example is analyzed with abruptly changing injection temperature, which makes a transient thermal analysis necessary. In the case of the Progressive Plastic Deformation design check (PD-DC), Melan’s shakedown theorem and cycling of a Finite Element (FE) model with a linear-elastic ideal-plastic material model are used. In the case of the Fatigue design check (F-DC) some problems are discussed: One of them is cycle counting in the case of non-proportional loading, another one is the use of structural stresses and stress concentration factors.

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Clarkson, David M., Christopher D. Bell und Donald Mackenzie. „Comparative Evaluation of Plastic Design Methods for Fatigue Assessment of a Nuclear Class 1 Piping Nozzle“. In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21271.

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Abstract Design-by-analysis (DBA) procedures for Nuclear Class 1 pressure vessels such as those prescribed within ASME Boiler and Pressure Vessel Code (BPVC) Section III, provide rules to demonstrate assurance against fatigue failure. Two general assessment routes exist, linear finite element analysis (FEA) with stress categorization and elastic-plastic penalty factors, or nonlinear FEA with direct multiaxial strain evaluation. Whilst the elastic design route possesses many practical advantages, it is widely acknowledged to be very conservative, sometimes unacceptably so. At the cost of additional analysis effort, plastic design methods can provide a more appropriate evaluation of fatigue usage, potentially avoiding unnecessary design modifications and reducing the burden of in-service inspection requirements. This paper presents and compares various strain measures proposed for ASME III plastic fatigue analysis within the technical literature. A case study of a typical pressurized water reactor (PWR) main coolant line (MCL) piping nozzle subjected to pressure and thermal loads is presented. The influence of strain measure selection on the FE-derived strain concentration (Ke) factors is examined. Some important considerations for calculation of realistic Ke factors in ASME III are further discussed.

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