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Littérature scientifique sur le sujet « Excavation (process) »

Auteur : Grafiati

Publié le 25 juillet 2024

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Excavation (process)"

Lee, Joosung, Byeol Kim, Dongik Sun, Changsoo Han, and Yonghan Ahn. "Development of Unmanned Excavator Vehicle System for Performing Dangerous Construction Work." Sensors 19, no. 22 (2019): 4853. http://dx.doi.org/10.3390/s19224853.

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Of all the machinery and equipment used on construction sites, excavators are responsible for the greatest number of fatal accidents. Excavation is an inherently risky process due to imprecise work processes and the unstable external environment on most work sites. The resulting accidents cause serious injuries that threaten the lives of not only the excavator pilots but also those working around them. In this study, we propose a mechanical device that is capable of operating the excavator remotely from a nearby safe location such as a site office. To ensure worker safety and at the same time

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Lukashuk, Olga A., and Konstantin Iu Letnev. "Determining operation parameters of the leverage mechanism in a mining excavator." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal 1 (March 30, 2021): 94–102. http://dx.doi.org/10.21440/0536-1028-2021-2-94-102.

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Introduction. The paper analyzes the process of rock excavation using a front-shovel operational equipment of an open-pit excavator in the context of determining rational modes of operation for its main mechanisms (lifting and thrusting mechanisms) during the excavation. The main purpose of the study is to establish the kinematic and dynamic characteristics of the excavation process by identifying patterns of changes in the operating parameters of the main mechanisms. Research methodology includes mathematical modelling and computational experiment with the use of machines and mechanisms theor

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Zhou, Zhangtao, Zheming Zhu, XinXing Jin, and Hao Tang. "Numerical Prediction of Rock Fracturing During the Process of Excavation." International Journal of Geotechnical Earthquake Engineering 1, no. 2 (2010): 12–23. http://dx.doi.org/10.4018/jgee.2010070102.

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During the process of excavation, blasting can induce cracking inside the surrounding rock. Considering the effects of material properties and loading conditions, a rock blasting excavation model with two successive excavation steps was developed through the use of AUTODYN code. Four kinds of equation of state (EOS), linear, shock, JWL, and compaction were applied to the materials employed in this numerical model. A modified principal stress failure criterion was applied to determining material statuses, and TNT explosive and a relatively homogeneous igneous rock, diorite, were used in this nu

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Qin, Zuhe. "Modeling and Simulation of Theoretical Digging Force of an Excavator Based on Arbitrary Posture." Mathematical Problems in Engineering 2022 (September 10, 2022): 1–7. http://dx.doi.org/10.1155/2022/8030349.

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Theoretical digging force is an important performance parameter of the hydraulic excavator. Due to the multi-linkage mechanism, the digging posture of an excavator is ever-changing; thus, it is not easy to calculate the theoretical digging force. Traditionally, the theoretical digging force is calculated by selecting a limited number of postures of the excavator based on experience, which cannot reflect the force condition of each posture in the excavation process. In order to calculate the theoretical digging force of any posture in the excavation process, this paper uses the principle of the

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Yang, Zi Sheng, Jun Xia Liu, and Yi Ren Wang. "Weight Analysis of Accident Factors in Deep Foundation Excavation Based on Analytic Hierarchy Process." Applied Mechanics and Materials 711 (December 2014): 529–34. http://dx.doi.org/10.4028/www.scientific.net/amm.711.529.

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For the past few years, great development has been achieved in deep foundation excavation. However, due to foundation excavation’s locality, individual diversity, complexity and uncertainty, the probability of accidents in foundation pit engineering tends to be greater than that in main works, and the accident rate may even reach about 20%, which makes the study on factors leading to foundation excavation accidents quite necessary and meaningful. By use of Analytic Hierarchy Process (AHP), this paper has figured out the ratio (weight) of the investigation, design, construction and other factor

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Li, Shen Gang, Wen Zhao, Xiao Li Cai, Yin Fu Ma, and Lu Zhang. "Research on Stability in Metro Tunnel Constructing with Shallow Buried Covered Excavation in Loose Sand Layers." Advanced Materials Research 594-597 (November 2012): 1240–44. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.1240.

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For subway tunneling in urban underground, high safty of construction is needed.However, the safty and rationality of excavating plan are forecasted difficultly because of consealment. Based on the Zhang-Shen tunnel construction of Shenyang subway, bench method, single side-wall heading excavation method and CD excavation method are numerical simulated; according to the numerical calculation results and the constructing process, bench method is adopted; the ground settlement caused by excavation monitored during excavating is in the allowed range and the tunnel is safe during excavating.

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Shemiakin, Stanislav. "Determining the maximum turning force of the hydraulic backhoe excavator bucket." Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal, no. 3 (June 20, 2023): 17–24. http://dx.doi.org/10.21440/0536-1028-2023-3-17-24.

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Introduction. Single-bucket excavators with both flexible and rigid suspension of work equipment are actively engaged in construction, stripping work and production mining. Excavators with rigid suspension are commonly used in construction, while excavators with flexible suspension are used in mining practice. This work considers the process of excavating rock with a single-bucket hydraulic backhoe excavator. The reliability and durability of excavators depend on the correct choice of the parameters of work equipment elements. Research objective is to determine the maximum turning force of the

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Mu, Linlong, Jianhong Lin, Zhenhao Shi, and Xingyu Kang. "Predicting Excavation-Induced Tunnel Response by Process-Based Modelling." Complexity 2020 (April 28, 2020): 1–11. http://dx.doi.org/10.1155/2020/9048191.

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Potential damages to existing tunnels represent a major concern for constructing deep excavations in urban areas. The uncertainty of subsurface conditions and the nonlinear interactions between multiple agents (e.g., soils, excavation support structures, and tunnel structures) make the prediction of the response of tunnel induced by adjacent excavations a rather difficult and complex task. This paper proposes an initiative to solve this problem by using process-based modelling, where information generated from the interaction processes between soils, structures, and excavation activities is ut

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Wu, Shan, Jian Wu, and Dunwen Liu. "Research on Construction Sequences and Construction Methods of the Small Clear-Distance, Double-Arch Tunnel under an Asymmetrical Load." Applied Sciences 13, no. 14 (2023): 8242. http://dx.doi.org/10.3390/app13148242.

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A small clear-distance, double-arch tunnel under an asymmetrical load combines the characteristics of small clear-distance, tunnels and double-arch tunnels, and the influence of an asymmetrical terrain must be considered. Its construction stability is a problem worth studying. This paper used the Wengcun tunnel as the engineering background. Midas/GTS finite element analysis software was used to study the effects of eight excavation sequences and two excavation methods on tunnel stability. The results showed that the deformation and force of the tunnel were asymmetric under the asymmetrical te

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Wang, Yong, Linlin Wang, Chenchen Li, et al. "Optimization of Excavator Bucket Structure by a Coupled Simulation Method." Applied Sciences 13, no. 20 (2023): 11336. http://dx.doi.org/10.3390/app132011336.

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As a component directly in contact with materials in the excavation process of the excavator, the structure and performance of the bucket directly affect the efficiency of the excavator. With the increasingly prominent environmental and energy problems, it has become a research difficulty to optimize the bucket structure of excavators so as to reduce the digging resistance and energy consumption of excavators. Therefore, an orthogonal optimization method of bucket structure that couples Adams with EDEM was proposed to explore the excavation performance of buckets with different structures unde

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Thèses sur le sujet "Excavation (process)"

Erlandsson, Sophie. "The Foliage." Thesis, Konstfack, Institutionen för Konst (K), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-5820.

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The happening of life can reduce you in to a machine where its only focus is on the relentless rationing of energy. When down on the deep sea plane, not much work gets done. But; I write everything down. Because of my fear of forgetting. I forget anyway, so it might seem pointless. I leave the notes, tucked away behind my back while trying to get out of bed, get dressed, answer an email, speak and understand language, remembering the now. Why take notes that does not get read for weeks, months, years or never. Halfway through my masters I realized its importance; my practice contains of the ex

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Simsek, Gokce. "Interventions On Immovable Archaeological Heritage As A Tool For New Formation Process." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610570/index.pdf.

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In the preservation discourse, interventions are generally viewed as technical issues. Considering that interventions cause variety of changes in the characteristics of archaeological edifices starting from the excavation, these changes constructs and shapes the archaeological edifices in terms of its appearance and meaning. In that respect, interventions act as tools for making changes in archaeological edifices by causing transformation of existing characteristics, loss of some others and adding new ones. Based on this, the study aims to evaluate interventions by putting change at the cent

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Hamid, Elamin Hamed, and Taher Handrin Mohammad. "Utveckling av en skopkonstruktion med lägre produktionskostnader." Thesis, Högskolan Väst, Avdelningen för maskinteknik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8314.

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Detta examensarbete handlar om en skopkonstruktions utveckling, avsedd för en serieskopor men konstruktionen har enbart implementerats på en kabelskopa. Arbetet har utförtspå uppdrag av ett verkstadsföretag som utvecklar, tillverkar och säljer entreprenadutrustningtill grävmaskiner och hjullastare. Företagets vision är att komma ut på den svenskalågprismarknaden, men i dagsläget är produktionskostnaderna på skoporna för höga. Måletmed arbetet har varit att ta fram en konstruktionslösning som sänker företagets produktionskostnader.Efter ett möte med företaget tydliggjordes vilka behov som efter

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Jalkebo, Charlotte. "Placement of Controls in Construction Equipment Using Operators´Sitting Postures : Process and Recommendations." Thesis, Linköpings universitet, Maskinkonstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-108980.

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An ergonomically designed work environment may decrease work related musculoskeletal disorders, lead to less sick leaves and increase production time for operators and companies all around the world. Volvo Construction Equipment wants to deepen the knowledge and investigate more carefully how operators are actually sitting whilst operating the machines, how this affects placement of controls and furthermore optimize controls placements accordingly. The purpose is to enhance their product development process by suggesting guidelines for control placement with improved ergonomics based on operat

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Hsu, Bo-Hisung, and 許博雄. "An Analysis of Mechanical Behavior during Excavation Process Subjected to Earthquake Motion." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/8yyn9b.

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碩士 國立中興大學 土木工程學系所 107 Taiwan is an active area of earthquakes, with an average of 16,000 earthquakes per year. The frequency of earthquakes is high. At present, underground excavation projects are constructed very often with the economic development and the increase of housing request. There is very little research in the effect of construction process of excavation projects subjected to earthquake motion. In this study, the mechanical behavior of construction process of excavation projects for different excavated depth subjected to earthquake motion is studied using PLAXIS 2D fini

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Huang, Wen-Sung, and 黃玟菘. "A Study of Toe-excavation Induced Failure Process for a Dip Slope with Rock Anchorage." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/64260148149349192005.

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碩士 國立臺灣大學 土木工程學研究所 100 On April 25, 2010, without rainfall and earthquake triggering a massive landslide (200000 m3) covered a 200m stretch of Taiwan’s National Freeway No. 3, killing 4 people, burying three cars and destroying a bridge. The failure mode appears to be a dip-slope type failure occurred on a rock anchorage cut slope. Based on the investigations and the numerical analysis in this study, the toe-excavation at this dip-slope in 1998 was the most crucial factor. Although the excavated area had stabilized soon with rock anchors and backfills. The strength of rock mass had

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HUANG, MING-CHIEH, and 黃名杰. "A study on the analysis method of removed brace process in deep excavation by RIDO program." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/39036382515823383685.

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碩士 中原大學 土木工程研究所 96 In this research, a U-shape retaining wall model is constructed using both FLAC, a two dimensional numerical analysis software, and RIDO, a one dimensional numerical analysis software. In the first stage of analysis, RIDO model is used with a spring to simulate the behavior of a structural side wall. In simple and small projects, if reduction of backward bracing is found in the analysis, we can reduce the bracing as suggested by the analysis. In complicated projects, FLAC model is used for the final design in order to reduce the construction costs. It is found in

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Ju, Shaw-Yih, and 朱紹義. "The Study on the Construction Technique and Excavation Process Using D&B Method for Rock Tunnel in Northern Secondary Freeway." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/76894689989187702499.

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Gaffney, Vincent L., R. H. White, H. Goodchild, and L. Bevan. "Wroxeter, the Cornovii, and the urban process: vol.1 researching the hinterland final report on the Wroxeter Hinterland project 1994-1997." 2007. http://hdl.handle.net/10454/5828.

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Liao, Kuang-i., and 廖光毅. "A Study on excavating possible factors of company failure from the view of information system deployment process - with a bicycle incorporate as a case study." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/89690339149773276192.

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碩士 雲林科技大學 資訊管理系碩士班 96 As information technology develops so rapidly, many implicit data can be striving from transaction and calculation of this technology. The statistical records of the Ministry of Economic Affairs has reveal that the annual failure company were more 70% higher than those had established that year, it is very obvious that the failure rate was much higher than those successful companies. Nevertheless, the cause of the failure is so scarcely been discussed. In this study, through the participation of the practical experiences of the researcher when the organization

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Livres sur le sujet "Excavation (process)"

Håkan, Stille, ed. Rock engineering. Thomas Telford, 2010.

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Olivieri, Luca M. Stoneyards and Artists in Gandhara The Buddhist Stupa of Saidu Sharif I, Swat (c. 50 CE). Fondazione Università Ca’ Foscari, 2022. http://dx.doi.org/10.30687/978-88-6969-578-0.

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The book advances a hypothetical reconstruction of the planning and programming of the building site, the executive process, the construction and decoration, and ultimately the deconsecration and abandonment of an ancient Buddhist stupa in Gandhara. The chronological context is the mid-first to the early fourth century CE. The stupa is located near the town of Saidu Sharif in the fertile and rich Swat valley, a northern region of ancient Gandhara (today in Pakistan). The study is based on archaeological excavation data conducted at the site over several seasons. The narrative frieze of the stu

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Díaz, Alonso Rodríguez. Extremadura tartésica: Arqueología de un proceso periférico. Bellaterra, 2001.

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Jamieson, Susan Mary. Neutral Iroquois lithics: Technological process and its implications. University Microfilms International, 1992.

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Amalia J. Gramajo de Martínez Moreno. Proceso fundacional en el antiguo Tucumán: Hechos y testimonios. Sigma, 1991.

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Joshi, Ramchandra Vinayak. Chemical studies of archaeological bones from India: Fluorine and fossilization process. Deccan College Postgraduate and Research Institute, 1986.

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Krauze, Krzysztof. Teoria procesu roboczego frezujących organów ślimakowych w skałach średniozwięzłych. AGH, 1995.

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Kligmann, Débora M. Procesos de formación de sitios arqueológicos: Tres casos de estudio en la Puna medidional catamarqueña argentina. Archaeopress, 2009.

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Niesiołowska-Wędzka, Anna. Procesy urbanizacyjne w kulturze łużyckiej w świetle oddziaływań kultur południowych. Zakład Narodowy im. Ossolińskich, 1989.

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Ruíz, Arturo. Los iberos: Análisis arqueológico de un proceso histórico. Crítica, 1993.

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Chapitres de livres sur le sujet "Excavation (process)"

Lukashuk, O., K. Letnev, and A. Komissarov. "Specifics of Rock Excavation Process Using Open-Pit Excavator." In Lecture Notes in Mechanical Engineering. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54817-9_91.

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Qi, Xili, Kai Wang, Zhijin Tian, et al. "Research on the safety of deep foundation pit excavation by pre-excavation and excavation process monitoring." In Frontiers of Civil Engineering and Disaster Prevention and Control Volume 2. CRC Press, 2022. http://dx.doi.org/10.1201/9781003348436-49.

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Niroshinie, M. A. C., Nobuyuki Ono, Yasuyuki Shimizu, and Kazuya Egami. "Flow Analysis for Navigation Safety by Using iRIC Model Nays2DH." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6138-0_76.

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AbstractFor safer navigation, it is important to reduce the shallow water effects and reduce the possibility of sedimentation. The shallow water effect is a vital factor in confluence areas where the depth of the navigation routes is subject to frequent changes during high flow and low flow times. This study summarizes the flow analysis during the process of improving the navigation channel around a confluence area by excavating shallow areas up to two possible bed elevation levels (3.3 OPm and 2.8 OPm). The analysis results, demonstrated that the depth has increased and the velocity has decre

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Ge, Wensheng. "Analysis of Tunnel Excavation Deformation Based on FLAC3D." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5814-2_32.

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AbstractDeformation analysis of tunnel excavation is one of the core problems. FLAC3D is used to simulate tunnel excavation, including tunnel modeling, excavation and support, and analyzes the force and deformation characteristics in the construction process. On the basis of collecting tunnel data, made reasonable monitoring measurement scheme, and measurement of the real-time monitoring data for the initial analysis, analysis the excavation time and excavation length regarding the deformation of the surrounding rock, predicted the deformation trend, determine the total displacement of the sur

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Gong, Mingde, Zhong Jin, Yue Zhang, Wenbin Liu, and Yue Ning. "Research on Autonomous Operation Motion Control of Excavator." In Lecture Notes in Mechanical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-1876-4_40.

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AbstractAccurate motion control is the premise for the unmanned excavator to complete the operation. In this paper, the motion control of a 22 t hydraulic excavator is studied. By establishing the dynamic model of the 4-degree-of-freedom excavator working device, the external interference caused by gravity, centripetal force, Coriolis force and inertia to the hydraulic cylinder is compensated. The bucket load and related parameters in the excavation process are identified online, and the motion control accuracy of the excavator is improved. Based on the dynamic model, the motion control method

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Wu, L. S., C. F. Li, T. B. Li, et al. "Potential Instability Modes and Support Stability Analysis of Soil Accumulation Slopes Along the Lexi Expressway." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4355-1_10.

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AbstractGeological conditions along the Mabian-Zhaojue section of Leshan -Xichang Expressway are complicated, and during the construction process, landslides and geologic hazards are frequent under the influence of engineering excavation disturbance. In view of the deformation, damage and development and evolution of soil slope under excavation disturbance widely existed along Leshan-Xichang Expressway, taking the soil accumulation body slope on the left side of the section from ZK125 + 654 to ZK125 + 775 along the route as the research object, the potential deformation and damage mechanism an

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Meng, Dan, Changfeng Yuan, and Guangming Yu. "Analysis of Ground Settlement Caused by Subway Tunnel Excavation." In Prediction and Control of Interaction Between Ground Building and Tunnel Construction Process. Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-3474-2_3.

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Zhang, J. Z., Q. H. Jiang, D. M. Zhang, and H. W. Huang. "Dynamically updating geological uncertainty simulation with the process of tunnel excavation." In Geotechnical Aspects of Underground Construction in Soft Ground. CRC Press, 2024. http://dx.doi.org/10.1201/9781003413790-39.

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Liu, An, Hua Li, Fei Lu, and Meifeng Niu. "Numerical Simulation with FLAC3D on Excavation Process of Underground Powerhouse of Kaluma Hydropower Station." In Advances in Frontier Research on Engineering Structures. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_19.

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AbstractThe dam site of Kaluma Hydropower Station is located on the Nile River in northern Uganda. It is a diversion power station with a total installed capacity of 600 MW. The gneissic fissures and medium dip fissures in the plant area not only reduce the strength of the rock mass, but also easy to form adverse combinations and cuts, which adversely affecting the stability of the cavern. Therefore, surrounding rock deformation and block instability are the key factors affecting the stability of underground caverns. Based on the field investigation data, according to the research of geologica

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Li, Langhua, Duwen Shen, and Qili Gan. "Application of Ultrasonic Nondestructive Testing Technology to the Horizontal Joint Slurry at the Bottom of Shear Wall." In Novel Technology and Whole-Process Management in Prefabricated Building. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5108-2_39.

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AbstractUltrasonic nondestructive testing (NDT) technology has a wide range of applications in the connection nodes of prefabricated building components. It is mainly used to test the quality of the connection nodes of prefabricated building components, such as filling degree, anchorage of steel bars, etc. This paper mainly introduces the detection of the filling degree of the shear wall bottom joint slurry. By discriminating acoustic parameters such as “sound velocity, amplitude, waveform” in ultrasonic detection method, the fullness of grouting is detected. According to the examples, the ope

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Actes de conférences sur le sujet "Excavation (process)"

Chen, Jianlan, Xin Zhao, and Fayun Liang. "Environmental sensitivity analysis of excavation process for deep foundation pit near railway in soft soil area." In IABSE Symposium, Tokyo 2025: Environmentally Friendly Technologies and Structures: Focusing on Sustainable Approaches. International Association for Bridge and Structural Engineering (IABSE), 2025. https://doi.org/10.2749/tokyo.2025.2072.

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To study the sensitivity of the excavation sequence of the excavation in the adjacent railway engineering of the urban complex project of co building metro stations with the same period, control the impact of excavation construction on the railway subgrade, and Ensure railway operation safety. This paper takes the underground engineering of a large complex in the soft soil area of Shanghai as an example. Three dimensional finite element software is used to simulate and analyze different excavation schemes for the foundation pit, and analyze the influence of different excavation sequen

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Munden President, Bruce A. "Insitu Method for Simultaneously Reinforcing and Protecting Corroded/Leaking Pipelines." In CORROSION 1989. NACE International, 1989. https://doi.org/10.5006/c1989-89233.

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Abstract This paper will present a field test performance and evaluation of a new insitu rehabilitation technology for reinforcing long lengths (1 to 20 miles) of weakened and deteriorated pipelines without excavation. One of the unique aspects of this process is its ability to simultaneously replace metal loss and protect pipelines against further corrosion attack. In addition, its unique applicability to long lengths of line without excavation makes the process extremely cost effective. Details cover the adaptation of material, surface preparation of the pipeline, application technique and a

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Liang, Jiajun (Jeff), Michael Holm, Gordon Fredine, and Yanping Li. "Effectiveness of Shorter Corrosion ILI Re-inspection Interval with Varied ILI Technologies: Finding the Unexpected High Corrosion Growth Rate of External Corrosion and MIC on Tape Lines." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-11345.

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Abstract Most pipeline operators are using back-to-back In-line Inspection (ILI) tool runs to calculate corrosion growth rate (CGR). The CGR is used to predict the remaining life of pipe based on identified corrosion features. This methodology can be problematic as corrosion is a stochastic (non-linear) process. CGR can be higher due to unexpected factors involved with the operation of the pipeline that include, but are not limited to, heavy rain fall, increased operating temperature and changing soil condition due to excavation. Moreover, predicting remaining life on polyethylene (PE) tape co

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Onuoha, C., S. McDonnell, E. Pozniak, and V. Shankar. "Comparison of Predicted and Outcome of Several ECDA Digs to Demonstrate Improvements in ECDA Methodologies." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-12811.

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Abstract Recent advances in External Corrosion Direct Assessment (ECDA) methodologies have restored confidence in pipeline operators who rely on this approach to assess the integrity of their pipeline assets. This is partially because of improvements in ECDA technologies to integrate multiple inspection techniques into one integrated pipeline inspection technique that ensures improvement in reliability while reducing the time and cost to collect data, and to process, analyze and report inspection results. It is now possible to accurately pinpoint direct examination locations and confidently pr

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Onuoha, C., S. McDonnell, L. de Guzman, E. Pozniak, and V. Shankar. "Interpretation and Selection of Direct Examination Locations with Respect to SCCDA Methodology." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-12812.

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Abstract The interpretation of indirect inspection data and selection of direct examination locations are crucial steps in conducting a successful Stress Corrosion Cracking Direct Assessment (SCCDA) process. This paper presents advances in the interpretation of indirect inspection data and selection of SCCDA direct examination locations and how the accurate selection of locations most susceptible to external corrosion would improve pipeline integrity. Comprehensive case studies from SCCDA digs, practical experience and lessons learnt from these case studies are fully presented. Stress Corrosio

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van Os, M. T., P. van Mastrigt, and G. G. J. Achterbosch. "The Utilization of a Pipeline Integrity Management System for ECDA Management within Gasunie." In CORROSION 2008. NACE International, 2008. https://doi.org/10.5006/c2008-08142.

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Abstract Gasunie has utilized External Corrosion Direct Assessment (ECDA) as proposed by the NACE as a valuable method to assess the corrosion threat to unpiggable pipelines. In addition, a new probabilistic methodology has been adopted to quantify the results of an ECDA and to account for any uncertainties experienced throughout the process. This approach, based on Structural Reliability Analysis (SRA) and Bayesian statistics, uses the data gathered in the pre-assessment to calculate a failure frequency for each ECDA region defined. In the indirect inspections step, the method allows automati

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Powell, Daniel, Mike Baezner, Mike Bongiovi, Delyn Houder, Marvin Miller, and Larry Rankin. "Practical Experiences in Validating the ECDA Process – Comparing Indirect Inspection Results and Direct Examinations." In CORROSION 2005. NACE International, 2005. https://doi.org/10.5006/c2005-05181.

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Abstract This paper provides an overview of the external corrosion direct assessment (ECDA) process by presenting the practical application of the process to a gas transmission pipeline owned by Company A. The paper describes each of the indirect inspection techniques used to assess the condition of the external coating on the buried pipeline, and then compares those results to results from direct examinations of selected sections along the pipeline. In addition, comparisons are also made to results from in-line inspections of that same pipeline. Note that the results from the in-line inspecti

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Onuoha, C., S. McDonnell, M. Wegner, G. Zinter, E. Pozniak, and V. Shankar. "Interpretation and Selection of Direct Examination Locations with Respect to ECDA Methodology." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09304.

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Abstract The interpretation of indirect inspection data and selection of direct examination locations are crucial steps in conducting a successful external corrosion direct assessment (ECDA) process. This paper presents advances in the interpretation of indirect inspection data and selection of ECDA direct examination locations and how the accurate selection of locations most susceptible to external corrosion would improve pipeline integrity. Comprehensive case studies from several ECDA digs, practical experience and lessons learnt from these case studies are fully presented. Failures in oil a

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Fatakdawala, Miqdaad. "Guidelines for the Collection of Reliable and Practicable ECDA Indirect Inspection Data." In CONFERENCE 2022. AMPP, 2022. https://doi.org/10.5006/c2022-17978.

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Abstract In recent years, pipeline leaks in the energy and infrastructure sectors have mandated asset owners to implement more regulated inspection regimes. NACE SP05021 – Pipeline External Corrosion Direct Assessment (ECDA) Methodology was created as a guide to apply the ECDA process and mitigate external corrosion on typical pipeline systems. The collection of reliable and practicable field data is crucial in the success of an ECDA process. Techniques and guidelines to obtain quality data in the field across the indirect inspection processes are presented. Some of the datasets discussed incl

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Kim, YoungGeun, DeokSoo Won, and HongSeok Song. "Validation of External Corrosion Direct Assessment with Inline Inspection in Gas Transmission Pipeline." In CORROSION 2008. NACE International, 2008. https://doi.org/10.5006/c2008-08136.

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Abstract External Corrosion Direct Assessment (ECDA) methods are widely adopted in the gas industry recently to verify the integrity of pipeline. ECDA is defined as a continuous improvement process. The validity of the assessment should be confirmed by comparison of the excavation results with the prioritization of indication. ECDA is usually applied to the un-piggable section of pipeline. As a result, a comparison of ECDA and ILI on the same section of pipeline is not reported frequently. We performed both ECDA and ILI survey over the same section of the pipe to validate ECDA. We can conclude

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Rapports d'organisations sur le sujet "Excavation (process)"

Stewart. L52283 Ground Positioning Satellite in Conjunctions with Current One-Call System - Virginia. Pipeline Research Council International, Inc. (PRCI), 2007. http://dx.doi.org/10.55274/r0010184.

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Excavation damage continues to be a leading cause of damage to underground facilities. It was cited as the cause in over 15% of all pipeline incidents in 2006. Effective damage prevention programs are necessary to prevent damages to underground facilities and to ensure public health and safety, environmental protection and continuity of vital services. All stakeholders, including the public, share responsibility for and the benefits of damage prevention. Although much has been done to address excavation damage it continues to be a problem. The Virginia Pilot Project for Incorporating GPS Techn

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Skow. PR-244-093703-R01 Uncertainties of In-line Inspection Crack Detection Tools Phases 1-2. Pipeline Research Council International, Inc. (PRCI), 2014. http://dx.doi.org/10.55274/r0010828.

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This project was carried� to develop better approaches to deal with in line crack inspection tool uncertainty. The primary objectives of the project were as follows: To develop practical and defendable methodologies to quantify the de facto tool accuracy for a specific pipeline, taking into account the limitations associated with field excavation programs.� To develop methodologies that can be used to incorporate the above mentioned tool characterizations into the crack management process. The objectives were addressed in two parts: first by estimating the number of defects in the pipeline, an

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Manning, Tyson, Thomas Prewitt, Scott Riccardella, and Pete Riccardella. PR335-233813-R01 Prioritization Methodology for Hard Spot Manufacturing Anomalies. Pipeline Research Council International, Inc. (PRCI), 2025. https://doi.org/10.55274/r0000129.

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This report describes a methodology for evaluating pipelines containing hard spot manufacturing anomalies and prioritizing such anomalies identified from In-Line Inspection (ILI). It is reported here to evaluate and enhance ILI tool technology and analysis capability to reliably detect, size, and quantify the pipeline integrity threat posed by hard spot manufacturing defects that have led to notable industry failures. This report covers one task of the project which is development of a specific methodology for evaluating the predicted failure pressure (PFP) of cracking that initiates in pipe b

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Ricci, Glenn, Sarah Gaines, and Amanda Babson. Integrated coastal climate change vulnerability assessment: George Washington Birthplace National Monument. National Park Service, 2024. http://dx.doi.org/10.36967/2304901.

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Through a series of workshops, a team of National Park Service, University of Rhode Island and related experts conducted a climate change vulnerability assessment to integrate issues across natural resources, cultural resources, and facilities for George Washington Birthplace National Monument (NM). This assessment used existing methods (Ricci et al. 2019a) and data, and expert knowledge to understand the general trends in current (2022) and future (2050, 2100) vulnerability and adaptive capacity. Climate stressors included sea level rise (SLR), storm surge, flooding, erosion rates, and precip

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Cazenave, Pablo, Katina Jimenez, and Ming Gao. PR-328-173865-R01 Evaluation of ILI Capabilities on Mechanical Damage Features. Pipeline Research Council International, Inc. (PRCI), 2020. http://dx.doi.org/10.55274/r0011946.

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ILI systems' testing was conducted at the PRCI Technology Development Center (TDC) using two (2) separate ILI pull tests strings with more than 120 MD specimens including plain dents, dents with corrosion, dents with gouges and dents with fatigue cracks. These specimens consisted of fabricated samples (dents with gouge and fatigue-induced cracks), as well as real-world features recovered from former in-service pipelines. Testing included four (4) different ILI systems with four (4) different ILI sensing technologies using a consistent and objective process. Testing focused on key variables to

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Watson, Mark, Martyn Wilmott, and Brian Erno. GRI-96-0452_2 Stress Corrosion Cracking Under Field Simulated Conditions II. Pipeline Research Council International, Inc. (PRCI), 1997. http://dx.doi.org/10.55274/r0011974.

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The pH of solutions found under disbonded polyethylene tape coatings in the field is generally in the range of 6.5 to 7.5. Electrochemically determining corrosion rates for pipeline steels exposed to neutral pH solutions in this pH range indicate that corrosion rates are too low to account for the observed crack growth rates from field excavation programs. This suggests that for the SCC process to be based on a simple dissolution mechanism then the pH at the crack tip would have to be lower than the bulk solution pH. A computer model was developed to determine solution chemistry changes within

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Bruce. L52273 Internal Repair of Pipelines. Pipeline Research Council International, Inc. (PRCI), 2005. http://dx.doi.org/10.55274/r0010287.

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External, corrosion-caused loss of wall thickness is the most common cause of repair for gas transmission pipelines. To prevent an area of corrosion damage from causing a pipeline to rupture, the area containing the corrosion damage must be reinforced. Since corrosion is a time dependent process, as pipelines become older, more repairs are required. Repair methods that can be applied from the inside of a gas transmission pipeline (i.e., trenchless methods) are an attractive alternative to conventional repair methods since pipeline excavation is precluded. This is particularly true for pipeline

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Kiefner, John. PR-218-074503-R01 Effectiveness of Current ROW Monitoring Processes. Pipeline Research Council International, Inc. (PRCI), 2009. http://dx.doi.org/10.55274/r0010970.

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The objective of this project was to assess the effectiveness of oil and gas operators transmission operators to prevent unauthorized excavations and encroachments on their rights of way in order to protect their buried pipelines from being damaged.

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Desjardins and MacKenzie. PR-218-123603-R01 Procedure for Determining the Number of Excavations to Validate SCCDA. Pipeline Research Council International, Inc. (PRCI), 2015. http://dx.doi.org/10.55274/r0010857.

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A challenge facing pipeline integrity groups is how to determine the number of digs required to confirm the presence or absence of SCC in a pipeline section as part of the Direct Assessment process. A Bayesian statistical methodology has been developed to solve this problem. The pro-cess requires the definition of a probabilistic susceptibility, which is the likelihood that significant SCC exists somewhere on a pipeline. The SCCDA�s probability of success to find SCC also plays a central role. Based on the initial probabilistic susceptibility (prior probability) and the SCCDA success rate, the

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Goh, Geok Yian, and John Miksic. The Istana Kampung Gelam (IKG) Site: A Preliminary Report. National University of Singapore Press, 2022. http://dx.doi.org/10.56159/sitereport10.

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Archaeological research at the Kampong Gelam site began in March 2000 and was concluded on 21 September 2000. The database accompanying this report, however, contains data entries for artefacts from later excavations that have found their way into the collection which the authors and their team analysed and processed. The finds were mostly 19th and 20th century ceramics and earthenware.

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