Relevant bibliographies by topics / Column unit

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Column unit'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 July 2025

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Journal articles on the topic "Column unit"

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Kh Kurbangaleeva, M. "Improving the Safety of the Rectification Unit for the Production of Alkylphenols." IOP Conference Series: Earth and Environmental Science 988, no. 2 (2022): 022007. http://dx.doi.org/10.1088/1755-1315/988/2/022007.

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Abstract As a result of the study, the analysis of occurrence of fire hazardous situation during the operation of rectification column of production facility of one of the city’s enterprises was carried out. This installation refers to facilities for which additional safety requirements are imposed. The main danger of the operation of rectification columns and their piping used at the installation is thefear of depressurization and theinitiation of gas contamination and fire situation on the site. As theresult of the fire, the rectification column and supporting metal structures can be in flam
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Gaber, Maryam, Anuar Kasa, Norinah Abdul Rahman, and Jamal Alsharef. "Comparison between unit cell and plane strain models of stone column ground improvement." International Journal of Engineering & Technology 7, no. 2 (2018): 263. http://dx.doi.org/10.14419/ijet.v7i2.8797.

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This article presents a comparative study of the behaviour of clayey soil reinforcements using stone column ground improvement by means of numerical analyses. Two-dimensional finite element analyses with commercially available software, PLAXIS, were performed on end-bearing stone columns using 15-noded triangular elements to investigate the impact of the modelling type on the stress concentration ratio and failure mechanism of an improved foundation system. Consolidation analyses were conducted throughout the study using Mohr-Coulomb’s criterion. The computed values of the stress concentration
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Azmi, Yusuf Iskandar, Nik Aslam Hafiz Nik Omar, Kok Shien Ng, Ahmad Safuan A. Rashid, Mazidah Mukri, and Yee Ming Chew. "Influence of Column Length on Settlement Performance of Floating Stone Column in Soft Clay." Journal of Advanced Research in Applied Mechanics 132, no. 1 (2025): 60–69. https://doi.org/10.37934/aram.132.1.6069.

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This paper presents the experimental solutions for the influence of length to the behavior and settlement performance of stone column. Laboratory experiments were conducted to compare the results between the settlement performance of end bearing stone columns and floating stone columns. Unit cell concept is used to idealize the settlement performance of large column group under the uniform load. The parameters that investigated are the column length to diameter ratio. This experimental investigation used a small-scale unit cell model tank and investigated the column length of a single column.
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Shien, Ng Kok, Yusuf Iskandar Bin Azmi, and Nik Aslam Hafiz Bin Nik Omar. "Experimental and Numerical Study of Floating Stone Columns Using Unit Cell Model Test." E3S Web of Conferences 586 (2024): 03001. http://dx.doi.org/10.1051/e3sconf/202458603001.

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Stone columns serve as a remedial measure to alleviate settlements and expedite the consolidation process, particularly in soft soils where excessive settlement and slow consolidation are the common problems. This paper presents the experimental and numerical investigation into the effects of area replacement ratio and stone column length on the consolidation settlement of floating stone columns using finite element software i.e. PLAXIS 3D. The model setup adopted unit cell concept resembling an infinite column grid pattern with uniform load. The study examined two distinct area replacement ra
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Zhang, Yusen, Yan Xu, Guangyao Li, Guanbao Ye, and Zhen Zhang. "Basic Mechanical Properties of Unit Cell-based Stiffened Deep Mixed Column." IOP Conference Series: Earth and Environmental Science 1336, no. 1 (2024): 012014. http://dx.doi.org/10.1088/1755-1315/1336/1/012014.

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Abstract As a composite column, stiffened deep mixed (SDM) column is formed by inserting a precast concrete core pile into the center of a deep mixed (DM) column. When SDM columns are used to support embankments over soft soil, they would be failed by shearing, compression, tension, and bending. This study conducted a series of laboratory tests to investigate the basic mechanical properties of a unit cell of SDM column, including uniaxial compression, direct shear and tension tests. The results reveal that the impact on improvement was minimal at a core ratio of 9.8%, subsequently followed by
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Masia, Mark J., and Nigel G. Shrive. "Carbon fibre reinforced polymer wrapping for the rehabilitation of masonry columns." Canadian Journal of Civil Engineering 30, no. 4 (2003): 734–44. http://dx.doi.org/10.1139/l03-015.

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The use of carbon fibre reinforced polymer (CFRP) wrapping to strengthen existing cracked masonry columns was investigated experimentally. The study was aimed at quantifying the increase in strength that can be achieved and assessing the effect of column size on the strength increase. Eighteen columns were tested, with three different square cross-sectional sizes (290 mm × 290 mm, 390 mm × 390 mm, 490 mm × 490 mm) and two different types of clay masonry unit. Six columns were constructed in each size, two columns using unit type 1 and four columns using unit type 2. Strengthening was achieved
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Kozhakhmetova, Dinara, Samal Kaliyeva, Laura Sugurova, Zharkynay Sugur, Ryszard Wójtowicz, and Tursynkhan Zhylkybayev. "Analysis of the Distillation Column of a Catalytic Cracking Unit Using Fuzzy Input Information." Energies 17, no. 17 (2024): 4446. http://dx.doi.org/10.3390/en17174446.

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The aim of this work is to analyze and model the performance of the distillation column of a catalytic cracking plant using fuzzy initial information. A system of mathematical models of the studied columns was developed, and we discussed the issues of modeling the distillation column of a catalytic cracking plant operating in conditions of fuzzy initial information. The system of mathematical models of the studied columns was developed on the basis of statistical and fuzzy information. The mathematical models of columns K-1, K-2 and K-3 were identified with regression and fuzzy regression equa
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Yang, Yingxin, Dongdong Song, Kuilin Huang, Haitao Ren, and Jian Zhou. "Unit Experimental Study on Impact Crushing Rock of the Microcoring PDC Bit." Shock and Vibration 2019 (November 3, 2019): 1–10. http://dx.doi.org/10.1155/2019/3173298.

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In light of the situation of sliced or powdery cuttings produced by conventional PDC bit, it is found that they are not convenient for geological logging and stratification. The unit crushing experiment which contains two breaking forms (static-pressure breaking and impact) is conducted on core columns of sandstone, limestone, and granite. This experimental study showed the following: The breaking work ratio of the three core column types is much less than that of the flat rock. The height of the core column has little effect on the bit penetration rate, while core column diameter has greater
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Li, Zhi Miao, Ju Bao Liu, Min Luo, and Qiang Zhang. "Dynamic Finite Element Analysis and Experimental Study of Rotating Column in Cylinder." Applied Mechanics and Materials 229-231 (November 2012): 453–56. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.453.

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Rotary slender column in cylinder is a special structure in oil engineering. It contacts with outer cylinder and interacts with its inner pipe fluid and outer annular fluid. A partitioned coupling model was founded by dispersing slender column into beam element, dividing fluid domain into some sections, dispersing fluid section into hexahedron unit and transfer method of the information of coupling interface was described. Dynamics experimental device of column-liquid interaction was built to do column rotating test with considering the displacement and force boundary conditions of rotating co
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Silva, Pedro F., and Sri Sritharan. "Seismic Performance of a Concrete Bridge Bent Consisting of Three Steel Shell Columns." Earthquake Spectra 27, no. 1 (2011): 107–32. http://dx.doi.org/10.1193/1.3525919.

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This paper describes the performance of a full-scale, three-column concrete bridge bent test unit that was designed, constructed, and tested under simulated in- plane seismic loads. Representing a typical bent configuration used by the Alaska Department of Transportation and Public Facilities, the test unit employed 12.7-mm-thick steel shell concrete columns and evaluated adequacy of an improved beam-to-column joint design procedure. The steel shell served as the external reinforcement and formwork for the columns. As intended, plastic hinges were fully developed in the columns adjacent to the
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Dissertations / Theses on the topic "Column unit"

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Cruz, Eva Brunilda. "A Comprehensive Dynamic Model of the Column Flotation Unit Operation." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/30748.

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The core of this project was the development of a column flotation dynamic model that can reasonably predict the changes in the concentrations of all solid and bubble species, along the full column height. A dynamic model of a process is normally composed of a set of partial or ordinary differential equations that describe the state of the process at any given time or position inside the system volume. Such equations can be obtained from fundamental material and/or energy balances, or from phenomenological derivations based on knowledge about the behavior of the system. A phenomenological appr
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Callahan, Justin. "Prediction of the Performance of a Flexible Footing on a Stone-Column Modified Subgrade." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4450.

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When foundations are designed on weak clay layers, it is a common practice to modify the subgrade by installing stone columns. Currently used methods for determining the level of ground modification, represented by the percentage of soil replaced (replacement ratio), assume a rigid foundation. These analytical methods provide the designer with the potential settlement reduction based on the compressibility parameters of the subgrade and the replacement ratio. The deficiencies of these methods are the assumption of rigidity of the foundation and the consideration of the settlement reduction as
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Bergeot, Ghislain. "Extension du concept "One-column" au lit mobile simulé réactif : application à la séparation réactive des C8 aromatiques." Thesis, Vandoeuvre-les-Nancy, INPL, 2010. http://www.theses.fr/2010INPL057N/document.

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La séparation des C8 aromatiques par Lit Mobile Simulé (LMS) permet d'obtenir du paraxylène (PX) pur. Les autres composés du mélange sont recyclés dans un réacteur afin d'être isomérisés puis séparés à nouveau. La charge du LMS est composée à environ 75% par ce flux de recyclage. L'intégration de la réaction dans le LMS, réalisée en intercalant des réacteurs d'isomérisation entre les lits d'adsorbant de la zone 3 (procédé LMS Réactif, LMSR), doit permettre une réduction de ce flux de recyclage.L'objectif de cette thèse est de développer une méthodologie d'étude des procédés de type Lit Mobile
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Šmarda, Michael. "Zjednodušený úvodní projekt uzlu destilace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228156.

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The target of diploma thesis was to improve author’s theoretical and practical design knowledge of process engineering. In the diploma thesis a Simplified Basic Engineering Project of distillation unit has been developed. It was necessary to become familiar with the process technology and formal requirements of Basic Engineering Project. The most important parts of Basic Engineering Project are material and heat balances. Material and heat balances are the corner stones of distillation unit equipment design. Parameters of process equipment are presented in the form of equipment datasheets. The
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TAVERNA, ANDREA. "ALGORITHMS FOR THE LARGE-SCALE UNIT COMMITMENT PROBLEM IN THE SIMULATION OF POWER SYSTEMS." Doctoral thesis, Università degli Studi di Milano, 2017. http://hdl.handle.net/2434/487071.

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Lo Unit Commitment Problem (UCP) è un problema di programmazione matematica dove un insieme di impianti termoelettrici deve essere programmato per soddisfare la domanda di energia e altri vincoli di sistema. Il modello è impiegato da decenni per supportare la pianificazione operazionale di breve termine dei sistemi elettrici. In questo lavoro affrontiamo il problema di risolvere UCP lineari di larga-scala per realizzare simulazioni accurate di sistemi elettrici, con i requisiti aggiuntivi di impiegare capacità di calcolo convenzionali, ad esempio i personal computers, ed un tempo di soluzione
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Bilko, Tomáš. "Návrh okruhu hydrostatického řízení traktoru Forterra." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231014.

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The topic of this thesis is strength check of hydrostatic steering circuit for Zetor Forterra HSX tractor. Next part of the thesis deals with steering column support structure and pedal group console design including FEM analysis, allowing installation of steering columns of different types.
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Бабенко, Володимир Миколайович. "Закономірності гідродинаміки і масообміну в процесах ректифікації суміші розчинників на новому контактному пристрої". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22718.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.08 – процеси та обладнання хімічної технології. – Національний технічний університет "Харківський політехнічний інститут" Міністерства освіти і науки України, м. Харків, 2016. Дисертацію присвячено дослідженню процесу поділу рідинних гетерогенних сумішей на регулярних контактних пристроях з різними геометричними параметрами насадочних елементів. Досліджено механізм процесу утворення рідинної плівки для колонних апаратів, що застосовуються в ректифікації у відповідності з гідродинамічними характеристиками
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Бабенко, Володимир Миколайович. "Закономірності гідродинаміки і масообміну в процесах ректифікації суміші розчинників на новому контактному пристрої". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/22717.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.17.08 – процеси та обладнання хімічної технології. – Національний технічний університет "Харківський політехнічний інститут" Міністерства освіти і науки України, м. Харків, 2016. Дисертацію присвячено дослідженню процесу поділу рідинних гетерогенних сумішей на регулярних контактних пристроях з різними геометричними параметрами насадочних елементів. Досліджено механізм процесу утворення рідинної плівки для колонних апаратів, що застосовуються в ректифікації у відповідності з гідродинамічними характеристиками
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Dong, Chunxiao, and 董春宵. "Uni-axial behaviour of concrete-filled-steel-tubular columns with external confinement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/195975.

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This thesis studies the uni-axial behaviour of circular double-skinned concrete-filled-steel-tubular (CFST) columns with external confinement in form of external steel rings. Particular attention is paid to the experimental behaviour of double-skinned CFST columns and theoretical model for evaluating the loadcarrying capacity of un- and ring-confined double-skinned CFST columns. Experimental studies on circular double-skinned CFST columns with various spacing of confinement, concrete strength and hollow ratio were conducted and discussed comprehensively. The mechanical properties of double-sk
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Luo, Lie, and 罗冽. "Uni-axial behavior of normal-strength concrete filled steel tubular columns with external confinement." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49618210.

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This thesis proposes two forms of external confinement for concrete filled steel tubular (CFST) columns. The confinement efficiency is studied by examining the axial strength enhancement and ductility improvement of the CFST columns with external confinement. Due to the heavy demand of confining steel to restore the column ductility in seismic regions, it is more efficient to confine these columns by hollow steel tube to form CFST column. Compared with transverse reinforcing steel, steel tube provides a stronger and more uniform confining pressure to the concrete core, and reduces the stee
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Books on the topic "Column unit"

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Powell, Colin L. My American journey. Ballantine Books, 2003.

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Powell, Colin L. My American journey: An autobiography. Random House, 1995.

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MOSBY. Radiographic Anatomy, Positioning and Procedures: Unit 8: Vertebral Column CD-ROM. Mosby, 1996.

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3 Column Accounting Ledger: General 3 Six Unit Columns, 31 Lines per Page, Non-Perforated, Green Cover. Independently Published, 2020.

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2 Column Accounting Ledger: General 2 Six Unit Columns, 31 Lines per Page, Non-Perforated, Black Cover. Independently Published, 2020.

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3 Column Accounting Ledger: General 3 Six Unit Columns, 31 Lines per Page, Non-Perforated, Burgundy Cover. Independently Published, 2020.

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2 Column Accounting Ledger: General 2 Six Unit Columns, 31 Lines per Page, Non-Perforated, Burgundy Cover. Independently Published, 2020.

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3 Column Accounting Ledger: General 3 Six Unit Columns, 31 Lines per Page, Non-Perforated, Wood Cover. Independently Published, 2020.

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3 Column Accounting Ledger: General 3 Six Unit Columns, 31 Lines per Page, Non-Perforated, Black Cover. Independently Published, 2020.

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3 Column Accounting Ledger: General 3 Six Unit Columns, 31 Lines per Page, Non-Perforated, Blue Cover. Independently Published, 2020.

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Book chapters on the topic "Column unit"

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Shiina, Takayuki, Takahiro Yurugi, Susumu Morito, and Jun Imaizumi. "Unit Commitment by Column Generation." In Operations Research Proceedings. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28697-6_78.

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Guyot, F., F. Alexandre, J. P. Haton, and Y. Burnod. "A Potentially Powerful Connectionist Unit: The Cortical Column." In Neurocomputing. Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76153-9_43.

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Loureiro, J. M., S. A. Figueiredo, M. M. Alves, Z. P. Lu, and A. A. Rodrigues. "Algebraic Prediction of the Behavior of a Three-step One Column PSA Unit." In The Kluwer International Series in Engineering and Computer Science. Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-1375-5_68.

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Sutikno, Juwari Purwo, Mahar Diana Hamid, Fa’izul Qholbi Tamimi, Kelben Roostewen, Rendra Panca Anugraha, and Renanto Handogo. "Sensitivity Analysis on Absorber Column as Hydrogen Gas Purification Unit Using Aspen Plus." In Lecture Notes in Electrical Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-2977-7_3.

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Bakri, Zulhazmee, Zakiah Ahmad, and Atikah Fatma Md Daud. "Behavior of Reinforced Masonry Column Under Axial Loading Using Sand Quarry Dust Modular Unit." In InCIEC 2013. Springer Singapore, 2014. http://dx.doi.org/10.1007/978-981-4585-02-6_52.

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Yuan, Chao, Feng Li, Min Wang, and Fei Tian. "Research on Key Technology of Rapid Integrated Construction of Fully Prefabricated Rigid Frame Bridge." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2532-2_19.

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AbstractBased on the reconstruction and expansion project of an expressway, a set of rapid construction technology for integrated erection of fully prefabricated rigid frame bridges is proposed, which solves the problems of unmatched work efficiency of each working face in the conventional integrated bridge erectors and long construction period of traditional suspension assembly technology. This method realizes the rapid construction of this type of bridges in highly urbanized areas. In this method, a new bridge girder integrated erection machine is used to synchronously install precast segmen
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Jin, Huan, Shengqiang Li, and Yaokai Tan. "Analysis of Collapse Mechanism and Seismic Measures of RC Frame Structure with Side Corridor." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5814-2_33.

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AbstractRC frame structure with side corridor is widely used in the construction of school buildings in southern China, but its seismic performance under strong earthquakes is much lower than the design expectations, and the seismic damage is very serious and even collapsed. Based on the seismic damage of the school building of in Wenchuan Xuankou Middle School, from experimental research to theoretical analysis, and from the RC frame unit model to the spatial frame model, the seismic collapse mechanism and reasons of RC frame structure with side corridor is deeply explored. The study shows th
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Harithkhan, Mohamed, Indrajith D. Nissanka, and Inoka Manthilake. "CFD Analysis on Efficient Arrangement of Condenser Unit to Minimize the Heat Column Generation Effect in High-Rise Residential Buildings." In Proceedings of the 5th International Conference on Building Energy and Environment. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9822-5_29.

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Mott, Robert L., and Joseph A. Untener. "Columns." In Applied Strength of Materials, Sixth Edition SI Units Version. CRC Press, 2017. http://dx.doi.org/10.1201/9781315153056-11.

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Vargas, Karen Silva, Marc Lavarde, Mohamed Fadhel Ben Aissa, Sandra Kirollos, and Rabah Azouani. "Unit Operations Engineering Design: Extraction and Distillation Columns." In Towards a Hybrid, Flexible and Socially Engaged Higher Education. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-52667-1_29.

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Conference papers on the topic "Column unit"

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Raut, Nitin, R. M. Chaudhari, and V. S. Naik. "Failure of Amine Regenerating Column of Amine Treatment Unit." In CORROSION 2009. NACE International, 2009. https://doi.org/10.5006/c2009-09334.

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Abstract This paper intends to provide a detailed description of a corrosion problem1 observed in the amine regenerating column in Amine Treatment Unit at a refinery. A leak was observed in a section of the column that had previously been repaired. Localized groove marks were observed on the internal surfaces of the column. Grooving was determined to be the result of acid gas out break inside the column which resulted in highly accelerated metal loss. This paper also discusses the probable causes of such corrosion attack, and likely remedies to control corrosion of the column. Insight and a de
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Shank, Roxanne A., Thomas R. McCartney, Samar Gharaibeh, and Marcos Panunzio. "Decontamination of a Vacuum Distillation Unit: Mechanical versus Chemical Cleaning; a Case Study." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09701.

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Abstract Vacuum Distillation is a key aspect of the petroleum refining process, with over 80% of US refineries and nearly all Canadian refineries and upgraders capitalizing on the operational benefits of this unit. A secondary processing unit, the vacuum distillation unit (VDU) receives the heavy bottoms from the atmospheric distillation unit (ADU) and further separates them with the benefit of vacuum pressure to prevent the cracking, or break down, of the oil. The VDU is composed of an outer shell, distillation columns and a fired heat exchanger. When fouled with heavy residuum, the efficienc
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Shargay, C. A., G. E. Jacobs, and M. D. Price. "Ammonium Salt Corrosion in Hydrotreating Unit Stripper Column Overhead Systems." In CORROSION 1999. NACE International, 1999. https://doi.org/10.5006/c1999-99392.

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Abstract In the past, the presence of ammonium bisulfide (NH4HS) or ammonium chloride (NH4Cl) in hydrotreater stripper overheads was relatively rare. However, designs of newer units and revamps to older units, are resulting in corrosive levels of NH4HS or NH4Cl in overhead systems. This is primarily due to the addition of a hot high pressure separator (HHPS) with the bottoms going directly (or through another separator) to the stripper. This paper presents data on one corrosion case history in detail, a summary of another case history reported in Refin-Cor 3.0 and the results of a brief survey
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Rao, Puppala V. "Sour Water Corrosion of Quench Column and Integrity Management in a Gas Plant." In CORROSION 2015. NACE International, 2015. https://doi.org/10.5006/c2015-06034.

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Abstract The scope of this paper is to discuss the challenges encountered in integrity management of a Quench Column against internal corrosion caused by sour water in a gas plant. The scope also covers repair techniques and methodologies adopted to maintain the integrity of the equipment without plant / unit shutdown thereby achieving improved reliability of the plant. The information provided in this paper is related to a sulphur unit equipment in a gas plant dealing with sour environments and is useful in taking a preventive approach for the safe and reliable operation of Liquefied Natural
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Su, Zhao-Gang, Sheng-Jie Chen, Yu-Fei Li, Liang Chen, and Jia-Yi Deng. "An Effective Two-Stage Column Generation Strategy for Solving Unit Commitment." In 2024 IEEE 8th Conference on Energy Internet and Energy System Integration (EI2). IEEE, 2024. https://doi.org/10.1109/ei264398.2024.10991931.

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Ramaseshan, Vinod, Ali H. Abdulal, Gusai Al-Aithan, Olavo C. Dias, and Faisal M. Al Faqeer. "Corrosion in a Hydrocracking Unit." In CORROSION 2014. NACE International, 2014. https://doi.org/10.5006/c2014-3936.

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Abstract One of our refineries operates a Two-Stage Hydrocracking Unit with a “Debutanizer First” Fractionation Scheme. The plant configuration is such that the performance of the debutanizer column has an impact both in terms of light ends recovery and more critically, the hydrogen sulfide (H2S) related corrosion issues both in the low pressure and high pressure loop within the hydrocracking unit. This paper analyzes the process performance degradation of the Debutanizer Column by trying to understand and identify the primary causes of the problem, analyzing the same and coming up with a poss
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Espinoza, Cesar, Chloe Lins, Sudhakar Mahajanam, Ryan DuBois, Ajay Aripirala, and Kate Williamson. "Coating System to Mitigate Against Hydrogen Cracking in Gas Dehydration Unit." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-11009.

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Abstract Volumetric UT (phased array) thickness measurements performed on the absorber column of a gas dehydration unit (GDU) found several laminations and clusters of inclusions around the chimney tray. This unit had been in operation for 40 years. A Fitness For Service (FFS Levels 1 and 2) analysis was conducted to evaluate the magnitude and implication of these defects on the safe operation of the column. The outcome of the FFS assessment indicated that the defects were of considerable size and hence the component could not continue in operation unless mitigating actions were taken. Several
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O’Kane, J. M., T. F. Rudd, D. Cooke, F. W. H. Dean, and S. W. Powell. "Detection and Monitoring of Naphthenic Acid Corrosion in a Visbreaker Unit Using Hydrogen Flux Measurements." In CORROSION 2010. NACE International, 2010. https://doi.org/10.5006/c2010-10351.

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Abstract Corrosion rates of up to 0.8 mm/per month were detected on a Visbreaker fractionation column. Internal examination of the column showed that the shell corrosion was confined to the vicinity of four trays situated approximately two thirds of the way up the column, with the highest rates being seen within the downcomers. Examination of the corroded areas within the downcomers indicated the presence of smooth, uniform zones of metal loss characteristic of organic acid corrosion. Further analyses of both the internal deposits and sections of shell plate taken from the areas of high corros
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Hamza, Ameer, and Rakan M. Samman. "Multiple Tube Failure of Crude Distillation Unit Offgas Inter Stage Coolers." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00549.

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Abstract Crude Distillation Unit (CDU) consist of off-gas compressor which is a two-stage centrifugal machine type with inter and after cooling exchanger. Off-gas from the Pre-flash Column, Atmospheric Column and Vacuum System Liquid ring compressor is combined in the CDU off-gas compressor suction drum. Any condensate or liquid carried over is separated from the gas and pumped with the off-gas compressor suction drum pumps to the discharge line from the second stage. During the analysis of cooling water refinery wide the CDU off-gas compressor inter stage coolers were identified as prime sour
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Li, Ningzhi, Chaoyu Zhang, Haochen Zhang, et al. "Study on a novel liquid air energy storage system integrated with single-column air separation unit." In 2024 4th International Conference on New Energy and Power Engineering (ICNEPE). IEEE, 2024. https://doi.org/10.1109/icnepe64067.2024.10860680.

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Reports on the topic "Column unit"

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Fu, Yucheng, Jie Bao, Chao Wang, et al. Absorber Column CFD model validation against PNNL’s device-scale absorber column on the LCFS unit. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1691502.

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Flach, G. SENSITIVITY ANALYSIS FOR SALTSTONE DISPOSAL UNIT COLUMN DEGRADATION ANALYSES. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1163502.

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Tanthapanichakoon, Wiwut, and Anchaleeporn Waritswat Lothongkum. Optimization of the debutanizer in platforming unit using PRO/II. Chulalongkorn University, 2004. https://doi.org/10.58837/chula.res.2004.71.

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To present the simulation model and the optimization of the operating conditions for the debutanizer of a platforming unit in a refinery plant using PRO/II for the most profit based on product quality constraints by varying the debutanizer column pressure and reboiler heat duty. The simulation models were simulated using PRO/II and the actual characteristic data of the debutanizer under steady state operation. The simulation results of the base case were found to agree well with the actual operating data. According to the preliminary economic evaluation by the optimization at the debutanizer c
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KellerLynn, Katie. Redwood National and State Parks: Geologic resources inventory report. National Park Service, 2021. http://dx.doi.org/10.36967/nrr-2287676.

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Comprehensive park management to fulfill the NPS mission requires an accurate inventory of the geologic features of a park unit, but Comprehensive park management to fulfill the NPS mission requires an accurate inventory of the geologic features of a park unit, but park managers may not have the needed information, geologic expertise, or means to complete such an undertaking; therefore, the Geologic Resources Inventory (GRI) provides information and resources to help park managers make decisions for visitor safety, planning and protection of infrastructure, and preservation of natural and cult
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Mueller, C., S. J. Piercey, M. G. Babechuk, and D. Copeland. Stratigraphy and lithogeochemistry of rocks from the Nugget Pond Deposit area, Baie Verte Peninsula, Newfoundland. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328989.

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Stratigraphic and lithogeochemical data were collected from selected drill core from the Nugget Pond gold deposit in the Betts Cove area, Newfoundland. The stratigraphy consists of a lower unit of basaltic rocks that are massive to pillowed (Mount Misery Formation). This is overlain by sedimentary rocks of the Scrape Point Formation that consist of lower unit of turbiditic siltstone and hematitic cherts/iron formations (the Nugget Pond member); the unit locally has a volcaniclastic rich-unit at its base and grades upwards into finer grained volcaniclastic/turbiditic rocks. This is capped by ba
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Lahav, Ori, Albert Heber, and David Broday. Elimination of emissions of ammonia and hydrogen sulfide from confined animal and feeding operations (CAFO) using an adsorption/liquid-redox process with biological regeneration. United States Department of Agriculture, 2008. http://dx.doi.org/10.32747/2008.7695589.bard.

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The project was originally aimed at investigating and developing new efficient methods for cost effective removal of ammonia (NH₃) and hydrogen sulfide (H₂S) from Concentrated Animal Feeding Operations (CAFO), in particular broiler and laying houses (NH₃) and hog houses (H₂S). In both cases, the principal idea was to design and operate a dedicated air collection system that would be used for the treatment of the gases, and that would work independently from the general ventilation system. The advantages envisaged: (1) if collected at a point close to the source of generation, pollutants would
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Shaffer, Austin, Justin Tweet, and Vincent Santucci. Colorado National Monument: Paleontological resource inventory (sensitive version). National Park Service, 2024. http://dx.doi.org/10.36967/2303444.

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Colorado National Monument (COLM) in western Colorado was established on May 24, 1911 with the purpose of preserving, understanding, and enjoying the natural and cultural resources of the landscape, focusing on the history, erosional processes, and geology present. Although not explicitly mentioned in the monument?s purpose statement, the paleontological resources of COLM are nevertheless important. Significant fossils have been known from the area since the late 19th and early 20th centuries, and from COLM specifically within a few decades of the monument?s founding. The direct urban interfac
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Shaffer, Austin, Justin Tweet, and Vincent Santucci. Colorado National Monument: Paleontological resource inventory (public version). National Park Service, 2024. http://dx.doi.org/10.36967/2303613.

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Colorado National Monument (COLM) in western Colorado was established on May 24, 1911 with the purpose of preserving, understanding, and enjoying the natural and cultural resources of the landscape, focusing on the history, erosional processes, and geology present. Although not explicitly mentioned in the monument?s purpose statement, the paleontological resources of COLM are nevertheless important. Significant fossils have been known from the area since the late 19th and early 20th centuries, and from COLM specifically within a few decades of the monument?s founding. The direct urban interfac
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Graber, Ellen R., Linda S. Lee, and M. Borisover. An Inquiry into the Phenomenon of Enhanced Transport of Pesticides Caused by Effluents. United States Department of Agriculture, 1995. http://dx.doi.org/10.32747/1995.7570559.bard.

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The objective of this collaborative research project was to determine the factors that may cause enhanced pesticide transport under effluent irrigation. For s-triazines, the potential for enhanced transport through association with effluent dissolved organic matter (OM) was shown to be small in batch and column studies and in numerical simulations. High alkalinity and pH of treated effluents increased soil-solution pH for selected soil-effluent combinations, promoting the dissolution of soil OM and mobilizing otherwise OM-retained pesticides. Evapotranspiration in column studies resulted in in
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George. PR-015-08610-R01 Laboratory Conformation of the Effect of Methanol on Gas Chromatograph Performance. Pipeline Research Council International, Inc. (PRCI), 2010. http://dx.doi.org/10.55274/r0010717.

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In natural gas production and processing applications, methanol is commonly injected into natural gas streams containing water to prevent the formation of hydrates in gas lines and subsequent equipment damage. However, gas chromatographs (GCs) at field sites are typically not equipped to identify or measure methanol, and unless excess methanol is expected to carry over into a gas stream, samples sent to a laboratory are not likely to be analyzed for methanol. As a result, the potential exists for errors in gas property determination, particularly in heating value and sound speed. A previous PR
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