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Relevant bibliographies by topics / Ultrasonic sealing

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Academic literature on the topic 'Ultrasonic sealing'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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Journal articles on the topic "Ultrasonic sealing"

1

Shinohara, Mitsuhiko, and Michio Ueda. "Ultrasonic wave sealing method for container." Journal of the Acoustical Society of America 117, no. 5 (2005): 2684. http://dx.doi.org/10.1121/1.1932324.

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Tirelli, G., G. C. Del Piero, G. Valentinuz, et al. "New generation cut-and-seal devices in oral and oropharyngeal cancer resection: clinical and cost-effectiveness study." Journal of Laryngology & Otology 132, no. 4 (2017): 341–48. http://dx.doi.org/10.1017/s0022215117002377.

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AbstractObjectives:To evaluate the clinical efficacy and cost-effectiveness of ultrasonic shears and the electrothermal bipolar vessel sealing system, in comparison to the traditional cold knife and bipolar forceps, in oral and oropharyngeal cancer surgery.Methods:Patients who underwent oral or oropharyngeal cancer resection and neck dissection with either ultrasonic shears (n= 36) or electrothermal bipolar vessel sealing (n= 32) were enrolled. Surgical time, intra-operative bleeding, blood drainage, post-operative pain, neck oedema, complications and hospitalisation duration were compared to those of an historical cohort of 36 patients treated using a cold knife and bipolar forceps. Additionally, a cost-effectiveness evaluation was performed.Results:Ultrasonic shears and, in particular, electrothermal bipolar vessel sealing, were advantageous compared to the traditional techniques. The cost of ultrasonic shears and electrothermal bipolar vessel sealing was completely offset by declining time-driven costs for the surgical team and operating theatre.Conclusion:Ultrasonic shears and, in particular, electrothermal bipolar vessel sealing, are more advantageous compared to the traditional techniques, from both a clinical and economic point of view.

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Nase, Michael, Sascha Bach, Armin Zankel, Jens-Peter Majschak, and Wolfgang Grellmann. "Ultrasonic sealing versus heat conductive sealing of polyethylene/polybutene-1 peel films." Journal of Applied Polymer Science 130, no. 1 (2013): 383–93. http://dx.doi.org/10.1002/app.39171.

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Zhang, Hong, Lin, and Zheng. "Influence of Ultrasonic Excitation Sealing on the Corrosion Resistance of HVOF-Sprayed Nanostructured WC-CoCr Coatings under Different Corrosive Environments." Coatings 9, no. 11 (2019): 724. http://dx.doi.org/10.3390/coatings9110724.

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The corrosion behavior of unsealed and sealed high-velocity oxygen-fuel (HVOF)-sprayed nanostructured WC-CoCr cermet coatings under different corrosive environments was investigated using scanning electron microscopy (SEM), open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Ultrasonic excitation sealing with aluminum phosphate was performed in an external ultrasonic bath with the frequency of 40 kHz at atmospheric pressure and room temperature. SEM micrographs revealed that the exposed area of the coating was effectively reduced by the coverage of aluminum phosphate sealant on the majority of pores. Electrochemical measurements demonstrated that the sealant with the help of ultrasonic energy could shift the corrosion potential to a more noble direction, reduce the corrosion current density, increase the resistance of charge transfer, and effectively improve the corrosion resistance of the coating in both 3.5 wt % NaCl and 1 mol·L−1 HCl solutions.

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Jongbaeg Kim, Bongwon Jeong, Mu Chiao, and Liwei Lin. "Ultrasonic Bonding for MEMS Sealing and Packaging." IEEE Transactions on Advanced Packaging 32, no. 2 (2009): 461–67. http://dx.doi.org/10.1109/tadvp.2008.2009927.

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Tomczak, Kamil, Jacek Jakubowski, and Łukasz Kotwica. "Self-Sealing Process Evaluation Method Using Ultrasound Technique in Cement Composites with Mineral Additives." Materials 13, no. 15 (2020): 3336. http://dx.doi.org/10.3390/ma13153336.

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The self-sealing process, associated with chemical and microstructural changes inside damaged cement-based composites, leads to the recovery of the original material integrity. Assessing the magnitude of internal changes in samples using non-destructive techniques to capture only the self-sealing effects is difficult. The challenge is evaluating the differences between subsequent observations in time and between samples with different properties. This paper proposes a new approach to the use of an ultrasonic technique for self-sealing investigation. The method allows the quantification of material changes strictly related to self-sealing processes, excluding changes caused by the naturally progressing hydration of binders. The applied ultrasonic pulse velocity (UPV) data processing procedure allows the investigation of material changes inside and near the cracks, the effects of stimulating the self-sealing of cement composites with mineral additives, and the assessment of changes over time. An important aspect of the method is the sample preparation procedure and testing conditions that reduce the impact of moisture content on the UPV measurements. New parameters allowing the quantitative characterization of the self-sealing process are proposed. The method was evaluated using cement mortars modified with siliceous fly ash with induced cracks 0 to 750 µm wide, which were then cured in water for 152 days. The maximum degree of effective crack filling as a result of autogenous self-sealing in the tested mortars was determined to range from 33% to 57%. Observations of the microstructure of the crack surface confirmed that apart from the volume of the newly formed products, the density of these products may have a key impact on the ultrasonic measurements of the self-sealing performance. The studies were supplemented by the examination of the compression strength of mortars, mortar sample scanning and computer image processing, and observations using an optical microscope and scanning electron microscope with energy dispersive spectroscopy.

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Mediana, Michael. "Flexible Packaging Challenges Met with Ultrasonic Sealing Solutions." Plastics Engineering 74, no. 2 (2018): 12–15. http://dx.doi.org/10.1002/j.1941-9635.2018.tb01839.x.

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Wang, Jian Jun, Jian Hua Sun, Shang Yu Yang, Yao Rong Feng, and Kai Lin. "Tubing String Thread Sealing Surfaces Damage Evaluation Based on Acoustic Elasticity Theory." Materials Science Forum 944 (January 2019): 828–34. http://dx.doi.org/10.4028/www.scientific.net/msf.944.828.

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During the processing of tubing premium threaded made up, the degree of the thread sealing surface intactness will directly affect the sealing performance of the string. Nevertheless, there are some difficulties to detect the damage of the engaged sealing surface effectively. In the present study the sealing surface damage was judged by the sealing surface contact stress’s relative changes according to the acoustic elasticity theory,. At the same time, the wear defects generated at the tubing sealing surface, during the tubing made up, contrasted with the wear and unworn surface roughness of coupling ultrasonic detected about the sealing surface. The results showed that with the acoustic amplitude evaluated the sealing contact stress was susceptible to the influence of surface roughness of coupling. But the reflection wave with the center frequency on the sealing surface characterization of the contact stress could avoid this problem effectively.

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Bach, Sascha, Karsten Thürling, and Jens-Peter Majschak. "Ultrasonic Sealing of Flexible Packaging Films - Principle and Characteristics of an Alternative Sealing Method." Packaging Technology and Science 25, no. 4 (2011): 233–48. http://dx.doi.org/10.1002/pts.972.

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Lin, Harvard Z., Y. W. Ng, A. Agarwal, and Y. F. Fong. "Application of a New Integrated Bipolar and Ultrasonic Energy Device in Laparoscopic Hysterectomies." ISRN Minimally Invasive Surgery 2013 (February 13, 2013): 1–4. http://dx.doi.org/10.1155/2013/453581.

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Objective. A retrospective study to evaluate the Thunderbeat, a new vessel sealing device in a small group of patients undergoing laparoscopic hysterectomy to test the safety and effectiveness in achieving hemostasis. Method. The Thunderbeat was used in 12 cases of total laparoscopic hysterectomy. Operative performance involving hemostasis, sealing/coagulation, cutting, dissection, and tissue manipulation was evaluated. Results. No complications were encountered intraoperatively and postoperatively. Intraoperative experience involving hemostasis, sealing/coagulation, and cutting was optimal. Tissue handling was acceptable except for fine dissection. Conclusion. The Thunderbeat is an efficient and safe alternative to standard bipolar in laparoscopic hysterectomy. Larger studies are required to evaluate the cost-effectiveness and significant reduction in operating times as compared to conventional bipolar energy.

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Dissertations / Theses on the topic "Ultrasonic sealing"

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Xu, Yifan. "Ultrasonic Sealing of Aluminum Foil Based Laminate Food Packaging Materials." The Ohio State University, 1999. http://rave.ohiolink.edu/etdc/view?acc_num=osu1363860721.

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Thürling, Karsten. "Prozessdatenanalyse zur Inline-Verminderung von Störeinflüssen beim Ultraschallsiegeln." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-214017.

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Beim Siegeln von Verpackungen können nicht-qualitätsgerechte Siegelnähte dadurch entstehen, dass sich Teile des Packguts zwischen den zu fügenden Packmittelbahnen befinden. Im Gegensatz zum konventionellen Wärmekontaktsiegeln besteht beim Ultraschallsiegeln die Möglichkeit, für jeden einzelnen Siegelvorgang Prozessdaten zu erfassen. Aus dem Bereich des Ultraschallschweißens ist bekannt, dass sich anhand dieser Daten der Prozess überwachen und dessen Güte bewerten lässt. Die vorliegende Arbeit untersucht den Informationsgehalt dieser Prozessdaten hinsichtlich störungsbehafteter Siegelnähte und leistet damit einen Beitrag zur Verbesserung der Verpackungsqualität und damit im besten Fall auch zu weniger Lebensmittelverlusten. Es wird dazu zunächst eine Systematisierung von möglichen Störprinzipen beim Siegeln hinsichtlich ihrer physikalischen Wirkprinzipe vorgenommen. Darauf aufbauend konnte ein Versuchsstand und eine Methodik zur Untersuchung der Thematik entwickelt werden. Abschließend wurden ausgewählte Störprinzipe untersucht, wobei sich ein sehr starker Packstoff- und Einfluss der Prozessführung herausstellte. Es konnte ein prinzipieller Zusammenhang zwischen Auswirkung einer Störung auf die Nahtqualität und die Prozessdaten gezeigt werden, welcher sich jedoch auf Basis der erarbeiteten Ergebnisse nicht verallgemeinern lässt.

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Franciscatto, Gisele Jung. "INFLUÊNCIA DA IRRIGAÇÃO ULTRASSÔNICA E SOLUÇÕES QUELANTES NO SELAMENTO DA OBTURAÇÃO DE CANAIS RADICULARES." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/6089.

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The present study assessed and compared the influence of the root canal treatment with and without passive ultrasonic irrigation with 17% ethylenediaminetetraacetic acid (EDTA) and 10% citric acid on the sealing of pre-molars root canal fillings. A hundred and fifteen single-rooted, human mandibular pre-molars, with oval canal, were selected. The teeth were prepared with rotatory instrumentation and irrigated according to the following protocols (n=23): G1, 17% EDTA + US; G2, 17% EDTA; G3, 10% citric acid + US; G4, 10% citric acid and a control group, 2,5%.sodium hypochlorite (NaOCl). The specimens were filled according to the no compaction technique and then inserted to a device for measuring the glucose leakage. Leakage was assessed through a Glucose Kit in a spectrophotometer at 7 and 30 days. Kruskal-Wallis test results showed less leakage on passive ultrasonic irrigation groups, with both test solutions (p<0,05). Mann-Whitney analysis showed that teeth treated with 17% EDTA showed less leakage levels then the ones treated with 10% citric acid (p<0,05). Passive ultrasonic irrigation with chelating solutions, specially EDTA, results in a better sealing of root canal filling Key-words: passive ultrasonic irrigation; sealing; root canal filling; citric acid.<br>O objetivo desse estudo foi avaliar comparativamente a influência do tratamento do canal radicular com e sem irrigação ultrassônica passiva com ácido etilenodiaminotetracético 17% (EDTA) e ácido cítrico 10% sobre o selamento da obturação de canais radiculares de pré-molares. Foram utilizados cento e quinze pré-molares inferiores humanos de canal único e oval. Os elementos foram preparados com instrumentação rotatória e irrigados segundo os seguintes protocolos (n=23): G1, EDTA 17% + US; G2, EDTA 17%; G3, ácido cítrico 10% + US; G4, ácido cítrico 10% e um grupo controle, hipoclorito de sódio (NaOCl) 2,5%. Todos os elementos foram obturados segundo a técnica da não compactação e em seguida inseridos em um dispositivo de infiltração de glicose. As medidas de infiltração foram analisadas através de um Kit Glicose em espectrofotômetro nos intervalos de tempo de 7 e 30 dias. Os resultados do teste de Kruskall-Wallis mostraram haver menor infiltração nos grupos nos quais foi utilizada a irrigação ultrassônica, com ambas as soluções teste (p<0,05). Segundo a análise de Mann-Whitney, o tratamento com EDTA 17% proporcionou menores níveis de infiltração comparado ao ácido cítrico 10% (p<0,05). A ativação ultrassônica de soluções quelantes durante o preparo, especialmente com o EDTA, melhora o selamento da obturação do canal radicular.

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Thürling, Karsten. "Prozessdatenanalyse zur Inline-Verminderung von Störeinflüssen beim Ultraschallsiegeln." Doctoral thesis, 2015. https://tud.qucosa.de/id/qucosa%3A29959.

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Beim Siegeln von Verpackungen können nicht-qualitätsgerechte Siegelnähte dadurch entstehen, dass sich Teile des Packguts zwischen den zu fügenden Packmittelbahnen befinden. Im Gegensatz zum konventionellen Wärmekontaktsiegeln besteht beim Ultraschallsiegeln die Möglichkeit, für jeden einzelnen Siegelvorgang Prozessdaten zu erfassen. Aus dem Bereich des Ultraschallschweißens ist bekannt, dass sich anhand dieser Daten der Prozess überwachen und dessen Güte bewerten lässt. Die vorliegende Arbeit untersucht den Informationsgehalt dieser Prozessdaten hinsichtlich störungsbehafteter Siegelnähte und leistet damit einen Beitrag zur Verbesserung der Verpackungsqualität und damit im besten Fall auch zu weniger Lebensmittelverlusten. Es wird dazu zunächst eine Systematisierung von möglichen Störprinzipen beim Siegeln hinsichtlich ihrer physikalischen Wirkprinzipe vorgenommen. Darauf aufbauend konnte ein Versuchsstand und eine Methodik zur Untersuchung der Thematik entwickelt werden. Abschließend wurden ausgewählte Störprinzipe untersucht, wobei sich ein sehr starker Packstoff- und Einfluss der Prozessführung herausstellte. Es konnte ein prinzipieller Zusammenhang zwischen Auswirkung einer Störung auf die Nahtqualität und die Prozessdaten gezeigt werden, welcher sich jedoch auf Basis der erarbeiteten Ergebnisse nicht verallgemeinern lässt.

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Books on the topic "Ultrasonic sealing"

1

J, Roberts Mark, and Langley Research Center, eds. Proceedings of the Second Annual Symposium for Nondestructive Evaluation of Bond Strength. National Aeronautics and Space Administration, Langley Research Center, 1999.

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J, Roberts Mark, and Langley Research Center, eds. Proceedings of the Second Annual Symposium for Nondestructive Evaluation of Bond Strength. National Aeronautics and Space Administration, Langley Research Center, 1999.

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Book chapters on the topic "Ultrasonic sealing"

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Gooch, Jan W. "Ultrasonic Sealing." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_12305.

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"Ultrasonic sealing." In Encyclopedic Dictionary of Polymers. Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_12069.

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"Ultrasonic welding (ultrasonic sealing)." In Encyclopedic Dictionary of Polymers. Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_12071.

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"Ultrasonic Sealing and Cutting in Thermoforming." In Advanced Thermoforming. John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118207086.ch37.

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Mukherjee, Shaswata, and Saroj Mondal. "Self-Healing Properties of Conventional and Fly Ash Cementitious Mortar, Exposed to High Temperature." In Emerging Design Solutions in Structural Health Monitoring Systems. IGI Global, 2015. http://dx.doi.org/10.4018/978-1-4666-8490-4.ch001.

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Direct stress and sub-stress caused by fire, temperature variation and external loading in a structure are most important for the development of cracks. The chemical reactions of natural healing in the matrix was not been established conclusively. The most significant factor that influences the self-healing is the precipitation of calcium carbonate crystals on the crack surface. The mechanism which contribute autogenic healing are: (a) Continued hydration of cement at cracked surface as well as continued hydration of already formed gel and also inter-crystallization of fractured crystals; (b) blocking of flow path by water impurities and concrete particles broken from the crack surface due to cracking; (c) expansion of concrete in the crack flank (swelling) and closing of cracks by spalling of loose concrete particle are also reported as the sealing mechanism by researchers. The recovery of mechanical as well as physical property was discussed by different researchers. An experimental investigation was carried out to study the autogenic healing of fire damaged fly ash and conventional cementitious mortar samples subjected to steam followed by water curing at normal atmospheric pressure. The micro cracks are generated artificially by heating the 28 days aged mortar samples at 800 Deg. C. The effect of fly-ash replacing ordinary Portland cement by 0 and 20% was studied. Recovery of compressive strength and physical properties i.e. apparent porosity, water absorption, ultrasonic pulse velocity and rapid chloride ion penetration test confirm the self-healing of micro cracks. Such healing is more prominent for fly ash mortar mix. Optical as well as scanning electron microscopy With EDAX analysis and X-ray diffraction study of the white crystalline material formed in the crack, confirms formation of calcium carbonate.

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Conference papers on the topic "Ultrasonic sealing"

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Guglielmo, Dave C., Todd T. B. Snelson, and Daniel F. Walczyk. "Modeling Ultrasonic Sealing of Membrane Electrode Assemblies for High-Temperature PEM Fuel Cells." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54427.

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Ultrasonic bonding, with its extremely fast cycle times and energy efficiency, is being investigated as an important manufacturing technology for future mass production of fuel cells. The objectives of the authors’ research are to (1) create a multi-physics simulation model that predicts through-thickness energy distribution and temperature gradients during ultrasonic sealing of polybenzimidazole (PBI) based Membrane Electrode Assemblies (MEAs) for High Temperature PEM fuel cells, and (2) correlate the model with experimentally measured internal interface (e.g., membrane/catalyst layer) temperatures. The multi-physics model incorporates the electrode and membrane material properties (stiffness and damping) in conjunction with the ultrasonic process parameters including pressure, energy flux and vibration amplitude. Overall, the processing of MEAs with ultrasonic bonding rather than a hydraulic thermal press results in MEAs that meet or exceed required performance specifications, and potentially reduces the manufacturing time from minutes to seconds.

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Pyzza, Jake M., William M. Sisson, and Raymond Puffer. "Manufacturing Implementation of Ultrasonic Sealing of Membrane Electrode Assemblies for High Temperature PEM Fuel Cells." In ASME 2011 9th International Conference on Fuel Cell Science, Engineering and Technology collocated with ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/fuelcell2011-54441.

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Early research has demonstrated the benefits of ultrasonically bonding PEM fuel cell Membrane Electrode Assemblies (MEAs), in terms of durability [2] and unit cost and cycle time [3]. With these improvements in performance, the next phase in the development of the process is to move from a laboratory setup to an automated production cell capable of producing larger volumes of fuel cells while maintaining a quality ultrasonic bond. The MEAs also need to be produced more affordably and with quality standards meeting or exceeding the level set by current best manufacturing practices.

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Van, Tuan Nguyen, Tuan Anh Nguyen, Phuong Nguyen Thi, et al. "Influence of Ultrasonic Sealing Treatment with Aluminum Phosphate on Properties of Al2O3-TiO2 Plasma Sprayed Ceramic Coating." In ITSC2021, edited by F. Azarmi, X. Chen, J. Cizek, et al. ASM International, 2021. http://dx.doi.org/10.31399/asm.cp.itsc2021p0322.

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Abstract Thermally sprayed Al2O3-TiO2 ceramic coatings provide exceptional hardness and corrosion and wear resistance, but the high velocities at which they are applied result in an inherently porous structure that requires some type of remediation. This study evaluates the effectiveness of ultrasonic aluminum phosphate sealing treatments on plasma sprayed Al2O3-40TiO2 ceramic coatings. The sealants were applied with and without ultrasonication (20-40 kHz) and were assessed using SEM/EDX analysis, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). Test data indicate that optimum sealing, corresponding to the highest values of corrosion protection and erosion resistance, are achieved under ultrasonication at 30 kHz for 5 hours.

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Uribe Juárez, Jorge Enrique, Alejandro C. Ramírez-Reivich, Crisanto Mendoza Covarrubias, and Ma del Pilar Corona-Lira. "A Review of the State of Art in Heat Sealing of Multilayer Polymer Films." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71644.

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All sealing technologies present inconveniences to be solved. One of the most significant adverse effects in the sealing production lines is the amount of material waste that is genetated due to the difficulties of achieving the correct thermal phase change in the polymer film during the sealing process. Sealing methods such as Induction, ultrasonic or heated jaw have similar operating characteristics, minimum gradients in pressure and temperature that are nedeed to create an efficient polymer transition, to produce the correct molecular arrangements and to avoid zones with little or null interaction between melted surfaces. This review shows the factors that affect the performance of jaw-multilayer polymer films that produce bad seal integrity; through understanding the design parameters to generate a small pressure and temperature gradients also characterizing and testing this phenomenon, the result of the review will help to identify theoretical basis and opportunities to design an innovate heated jaw sealing system with a uniform pressure and temperature along the sealing area.

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Khmelev, V. N., S. N. Tsyganok, R. V. Barsukov, and S. V. Levin. "Definition of quality criterion for the sealing seam obtained by ultrasonic welding of containers with blood specimens." In 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551). IEEE, 2004. http://dx.doi.org/10.1109/pesc.2004.241276.

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Zoumpoulidis, T., J. van Delft, M. de Wild, et al. "Ultrasonic and thermo-compression gold-to-gold bonding of narrow frames for hermetic cavity sealing and electrical interconnect." In 2008 33rd IEEE/CPMT International Electronics Manufacturing Technology Conference (IEMT). IEEE, 2008. http://dx.doi.org/10.1109/iemt.2008.5507813.

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Gardner, Dave, Hans Joakim Skadsem, Katherine Beltrán-Jiménez, Amit Govil, Guillermo Obando Palacio, and Laurent Delabroy. "A Comparison of the Measured Properties of Annular Cement with Ultrasonic Cement Evaluation Logs." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204015-ms.

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Abstract Different measurement methods have been utilized to investigate the quality of the cement sheath inside two cemented sandwich sections including high-resolution ultrasonic cement evaluation logs, analysis of samples, mechanical loading, and fluid seepage measurements. The sections were recovered from a North Sea well during a permanent plug and abandonment operation. The measurements have been analyzed with an aim to describe in detail the spatial variations in the cement properties and relate them to the logs. Ultrasonic cement evaluation logs were recorded to map the acoustic properties of the annular cement in the casing sections. Logging passes were recorded using different annular fluids and with different internal casing pressures to investigate the potential effect on the casing to cement bond response. The casing annulus was pressure tested using water and gas, and seepage rates were recorded whilst varying the annulus and the inner casing pressures. The sections tested were instrumented with an array of annulus pressure sensors. On one section, strain gauges were installed on the casing outer surface to record the transfer of strain through the cement sheath to the outer casing. The eccentricity of the inner casing was up to 70% compared with the outer casing which results in a substantial variation of the cement sheath thickness. Accordingly, the pressure sensors and strain gauge arrays were positioned to capture both axial and azimuthal variations of the cement sealing properties. Cement mechanical, chemical, and acoustic bulk properties were also measured on core plugs taken from the cement sheath. The log recordings and sensor measurements showed that the cement sheath properties vary considerably, both along the section length and from the narrow to the wide side of the annulus in the casing sandwich sections. The sealing quality of the cement sheath measured by pressure testing could be correlated with the log response. We observed a nearly linear reduction in seepage rates when increasing the inner casing pressure due to the reduction in size of the annular leakage path. Analysis of bulk properties confirm the presence of cement defects such as mud contamination and microannuli. The logs identified features related to the test cell construction that demonstrated the log spatial resolution and enabled an accurate spatial comparison to be made between the logs and cement sheath sealing properties. A comprehensive data set has been recorded on casing in casing-cemented sandwich sections with axial and azimuthal variations in the cement sheath quality. The data analysis has improved the understanding of the cement sheath mechanical properties, the seal quality, and the response of the ultrasonic cement evaluation logs.

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Chida, Itaru, Naruhiko Mukai, Wataru Kono, Takahiro Miura, and Masaki Yoda. "Development of Multifunction Laser Welding Head as Maintenance Technologies Against Stress Corrosion Cracking for Nuclear Power Reactors." In 17th International Conference on Nuclear Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/icone17-75138.

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Multifunction laser welding head has been developed. The head is able to perform not only underwater laser welding as repair, but also laser peening as preventive maintenance and laser ultrasonic testing as inspection. By using the effect of color aberration with optics, laser beam was focused to the ideal spot size on each process. Underwater laser welding was carried out onto EDM slit with the developed head and sealing ability with deposited weld metal was confirmed. As preventive maintenance, laser peening was also performed on the material surface with the developed head, and stress improvement ability was confirmed. For inspection with the developed head, a new method of visualizing weld defects in water by laser-ultrasonics has developed. Furthermore, developing synthetic aperture focus technique for visualized inspection surfaces 2-dementionally, the inspection result like penetrant testing despite underwater environment was achieved. Therefore, practicality of the developed head on each process was confirmed.

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Shi, Jiqing, Jielu Wang, Wenming Song, and Chaopeng Huang. "Failure Analysis of Flange Sealing Surface of Outlet Pipeline of Wax Oil Hydrogenation Reactor." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21251.

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Abstract Hydrogenation reactor is the core equipment of various hydrogenation units or hydrogenation processes. Because of the harsh service environment, the difficult manufacturing technology, the high requirements and the expensive cost, the safety of hydrogenation reactor is a very important problem. The outlet flange of hydrogenation reactor in a petrochemical company suddenly cracked after several years of use. The maximum depth of the crack from the sealing surface to the depth of the flange is 165 mm, the circumferential cracking range is about 130 degrees. The crack is in a circumferential and curved line along the sealing groove, and has small bifurcations at the tip. In order to ensure the safety of equipment operation and prevent the recurrence of this kind of accident, the causes of flange failure were systematically analyzed and the preventive measures are formulated. This paper reviewed the manufacturing quality data of the failed flange, and carried out a series of tests and analyses, such as macroscopic inspection, penetration testing, ultrasonic testing, mechanical properties test, chemical composition analysis, metallographic structure analysis, finite element stress check and so on. Combined with the use environment and the operation parameters of the flange, we preliminarily analyze that the cause of flange cracking may be manufacturing defects. In order to avoid the failure of flanges again, it is recommended that the flanges of the same batch should be tested one by one to ensure the safe and stable operation of the device.

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Katz, David C., Udo Ru¨hle, and Thomas Wolf. "16 Inch Williams Gas Pipeline Inspected for SCC Using PII’s New Ultrasonic Tool." In 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27055.

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Abstract:

The in-line-Inspection of Williams’ Gas West Pipeline in September 2001 was successfully completed using the newly developed 16” UltraScan® CD tool of GE PII Pipeline Solutions. The particular pipeline section inspected was known to be affected by Stress Corrosion Cracking (SCC). The inspection was carried out using the liquid batching technique developed by PII Pipeline Solutions. A special launcher and receiver barrel was designed to enable the handling of a series of three batching pigs in front of and two behind the inspection tool. A manifold of “kicker lines” was mounted to the barrel to launch the batching pigs and the inspection tool. The main benefits of this new design were minimizing operational downtime, ensuring complete air/natural gas displacement from the launcher, and providing for a smoother launch procedure. Due to the large elevation changes within the pipeline section, a key concern was maintaining pig velocity within 1m/s for adequate data resolution. Rather than rely on a general “rule of thumb”, a transient analysis was performed to define a range of possible batch sizes and better understand the expected pressure gradients while pumping the water slug. Based on actual data collected during this successful run, the transient model will be refined to better handle friction effects between the sealing cups and disks in future batch inspection runs. The data analysis stage for large crack features is completed and full analysis for small defects is ongoing. Analysis and excavation results are discussed in the paper. Results from this inspection are expected to considerably extend the understanding of crack formation in this pipeline and will be used to help establish an overall integrity management plan for the pipeline.

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Reports on the topic "Ultrasonic sealing"

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Zhang, Howard, Peter Sherman, Richard Boyd, Alex Savitski, and Magdy Hefnawy. Implementation: Ultrasonic Sealing of Preformed Pouches in Production. Defense Technical Information Center, 2005. http://dx.doi.org/10.21236/ada468048.

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