Articles de revues : « Piping analysi »

1

Choi, Ho-Sung, Jung-Hwan Moon et Jae-Ou Lee. « Fluid Behavior Modeling Optimal Design Using Network Piping Analysis Method ». Fire Science and Engineering 35, n^o 1 (28 février 2021) : 93–99. http://dx.doi.org/10.7731/kifse.6af732a2.

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The piping design should be considered by way of the network system in order to supply water for reliable fire extinguishing. However, the pipe scheduling method in line by the National Fire Safety Code is typically applied. When the modeling analysis method of fluid behavior is utilized based on the piping network theory, the fire-extinguishing water can be supplied more stably in a large-scale plant. Because a piping network consists of a large number of node points as well as consumes a lot of time and effort, it is recommended to use the commercial analysis program according to international standards. In this study, we used a piping network analysis program, sisHYD, which can model the actual piping according to the coordinates and analyze the fluid behavior inside the piping. As a result of the piping network analysis, it was possible to reduce the diameter of piping while ensuring the supply stability of firefighting water compared to the pipe scheduling method. Consequently, the value engineering effect of a construction project can be enhanced by reducing the wasted budget and inefficient factors.

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Chiba, T., R. Koyanagi, N. Ogawa et C. Minowa. « A Test and Analysis of the Multiple Support Piping Systems ». Journal of Pressure Vessel Technology 111, n^o 3 (1 août 1989) : 291–99. http://dx.doi.org/10.1115/1.3265677.

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One of the current topics in the seismic design of piping systems is the overall reliability of them in earthquake events. Actual piping systems are generally supported by independent structures such as vessels and steel structures. So, it is very important to clarify the behavior of actual piping systems during the seismic events. For this purpose, the analytical method of multiple excitation problems is a preferable approach to not only evaluate the actual behavior of the piping systems, but also improve the reliability of piping systems. To clarify the dynamic characteristics of the piping systems and to assess the computational methods in the linear system subjected to multiple support excitations, an experimental study using a realistic large-scale piping model has been conducted. The equations for the multiple excitation problem have been validated and the adequacy of the multiple response spectra method has been confirmed by the comparison of the test results with the analytical one. This paper reports the results focusing on the analytical methods of the multiple support piping system. It is noted that the multiple response spectrum method is efficient for the multiple excitation problems.

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Zahid, Umer, Sohaib Z. Khan, Muhammad A. Khan, Hassan J. Bukhari, Imran Ahmed et Kamran A. Khan. « A methodology for flexibility analysis of process piping ». Proceedings of the Institution of Mechanical Engineers, Part E : Journal of Process Mechanical Engineering 232, n^o 6 (2 novembre 2017) : 751–61. http://dx.doi.org/10.1177/0954408917738963.

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Design of piping system requires a systematic consideration of various factors as addressed by the codes and standards. This research paper aims to provide a method for flexibility analysis of a selected area of process piping at an industrial plant. Analysis is done for the purpose of accommodating a spare heat exchanger in the process layout. The analysis follows a systematic procedure, with preparation of a tentative model of the system on CAESAR II software followed by insertion of different pipe supports. The selection and location of these supports is based on the results obtained from displacement, stress, reaction and equipment nozzle analysis of the piping system. The design is in accordance with ASME B31.3, which is the standard code for process piping. The proposed method can be adapted for piping configuration of any industrial plant. With the provision of a systematic procedure, the method ensures time saving and efficient flexibility analysis of any piping system.

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Li, Yong Dong, Sheng Liang Han, Jie Liu, Ji Yong Liu et He Du. « Vibration Analysis and Control for Reciprocating Compressor Piping System ». Applied Mechanics and Materials 157-158 (février 2012) : 930–34. http://dx.doi.org/10.4028/www.scientific.net/amm.157-158.930.

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Following the adequate model of the reciprocating compressor piping system and the compressor design parameters, operating conditions and gas parameters, the mechanical system of compressor piping, gas-column system, pressure pulsations and of vibration response are numerically simulated. And the main factor bringing to the compressor piping system vibration is identified. A reasonable way to controlling piping vibration is developed to achieve a better efficiency. Keywords: Compressor; Pipe vibration; Vibration Analysis; numerical simulation.

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Wang, Bin, Cai Liu, Xue Li Wu et Xue Fei Qiao. « The Stress Analysis of New Pressure Piping Model ». Key Engineering Materials 474-476 (avril 2011) : 1215–20. http://dx.doi.org/10.4028/www.scientific.net/kem.474-476.1215.

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High-pressure becomes the high pressure unit design main consideration factor to compressive load capacity, security, efficiency, economic and manufacturing process of high-pressure equipment. This article proposes a new pressure piping according to the current high-voltage device development tendency and the future requirement. This new type of pressure pipe can be simplified for pipe casing model. Firstly we establish single, double and multilayer pressure piping model. We push out the multilayer pressure pipe stress formula according to stress situation of the analysis of the knowledge of mechanics of each model. We get this pressure piping withstand by the most intrinsic pressure enhance obviously under each layer within the radius of the cylinder reach the initial limitation of materials and other parameters of model are same through the comparison of the theoretical formula calculation with other general. Pressure pipeline calculated value. The multi-layer pressure piping system's circum radius are smaller than other piping with other pressure piping withstand the same most intrinsic pressure and the most interior radius are the same situation.

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Nam, Ki Woo, Jin Wook Kim et Seok Hwan Ahn. « Nondestructive Evaluation of the Corroded Pipe by Time-Frequency Analysis ». Key Engineering Materials 353-358 (septembre 2007) : 2277–80. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.2277.

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During plant operation, high temperature and high pressure water and steam are flowing at high velocity inside these piping systems. In pipes of power plants, local wall thinning may result from erosion/corrosion(E/C). Therefore, it is important to evaluate the nondestructive characteristics for corroded pipes to maintain the integrity of the secondary piping systems. In this study, the pressure vessel piping with corrosion used during long terms were investigated from the timefrequency analysis method. The damage of piping could be evaluated by ultrasonic parameters such as center frequency and echo waveform. Based on NDE analysis by time-frequency analysis method, it should also be possible to evaluate from various damages and defects in piping members.

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Hara, F. « Seismic Vibration Analysis of Fluid-Structure Interaction in LMFBR Piping Systems ». Journal of Pressure Vessel Technology 110, n^o 2 (1 mai 1988) : 177–81. http://dx.doi.org/10.1115/1.3265583.

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This paper is a basic study on the vibrational characteristics of an LMFBR piping system containing liquid sodium under one-dimensional seismic excitation. Using Z-shaped piping, we formulate coupled equations for the pipe’s bending vibration and pressure wave, and transform them into two-degree-of-freedom vibration equations for the first modes of the piping vibration and pressure wave. A numerical study using the vibration model shows that: 1) the coupling effect appears between piping acceleration and liquid pressure for a piping configuration having a natural frequency ratio ν = about 0.5 to 2.0; 2) the magnitude of seismically induced pressure reaches 0.7 kPa to 1 kPa per gal; and 3) the dead-mass model of liquid gives a nonconservative response depending on the pipe’s geometrical configuration, compared to that from the pressure-wave-piping-interaction model.

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Najib, Agus Setyawan, Indriyani Ardyarini et Dwiyanto Joko Suprapto. « Analysis of Piping at Kedung Uling Earthfill Dam, Wonogiri Regency, Central Java Province, Indonesia ». MATEC Web of Conferences 159 (2018) : 01039. http://dx.doi.org/10.1051/matecconf/201815901039.

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Kedung Uling earthfill dam is located between Eromoko and Wuryantoro district, Wonogiri Regency, Central Java, Indonesia. Water leaked from the dam was found and could decrease volume of dam. The objectives of this study are to identify piping and to recommend for solving piping problem. In order to determine the piping direction and litological pattern, investigation of 10 boreholes with various depth has been carried out. This investigation aim to determine characteristics of soil and rock by analyzing 45 cm of thickness of undisturbed samples and to perform permeability test. Permeability test have been conducted by falling head method with 3 different depths. Leaking at the dam was analyzed by Slide 6.0 software. The results indicated that litology of dam have been identified as claystone, sand and tuff. The piping passed under the eastern abutment of the dam is the accumulation of groundwater in the aquifers formed by 8-10 meters thick layer of sand. The total debit of piping is 17,774 cm3/sec. The Factor of safety of piping is under the minimum of standard namely 3,6. Grouting is one of alternative method to minimize the piping. Grouting was simulated to reduce permeability value and increase soil strength. By grouting, the total debit of piping was reduced to 3.314 cm3/sec.

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Liang, Ting, Gang Chen, Qi Zhang et Xu Chen. « Ratcheting Boundary Analysis of Straight and Elbow Piping ». Advanced Materials Research 118-120 (juin 2010) : 131–35. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.131.

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The ratcheting strains of the straight and elbow piping under two kinds of loads—pressurized piping under symmetric cyclic bending and pulsating cyclic pressure were analyzed based on Chaboche constitutive model. The locations of the maximum ratcheting strain were determined. The ratcheting boundaries of the two piping structures under two kinds of loads were compared and calculated by the C-TDF method. For the pressurized piping under symmetric cyclic bending, the allowable bending load increases from E90S to E90L under the same pressure. In the higher cyclic pressure range, the allowable pressure have little difference under the same bending load which indicates that the bend moment have a bit effects on the ratcheting boundary in the higher cyclic pressure range.

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Li, Ming, et Manohar Lal Aggarwal. « Stress analysis of non-uniform thickness piping system with general piping analysis software ». Nuclear Engineering and Design 241, n^o 3 (mars 2011) : 555–61. http://dx.doi.org/10.1016/j.nucengdes.2010.04.014.

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Zhao, Ying, Jianmei Feng, Bin Zhao, Shuangmei Zhou, Zhou Tang et Xueyuan Peng. « Vibration analysis and control of a screw compressor outlet piping system ». Proceedings of the Institution of Mechanical Engineers, Part E : Journal of Process Mechanical Engineering 233, n^o 2 (22 mars 2018) : 403–11. http://dx.doi.org/10.1177/0954408918763561.

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The severe vibration of a screw compressor outlet piping system caused the premature failures of some thermowells and the unplanned shut down of the compressor system. The root causes of the vibration problem were investigated by numerical simulations. An acoustic model was established to predict the pressure pulsation of the gas inside the pipelines, and two finite element models were built to study the vibration characteristics of the overall piping system and of the thermowells. The numerical results indicated that the vibration problem may be attributed to the excessive pressure nonuniformity of the gas inside the pipelines, low overall stiffness of the piping system and the first-order structural resonance occurred on the thermowells. A pulsation attenuator was added and the pipelines were rearranged to reduce the pressure pulsation, some pipe supports were added to improve the overall stiffness of the piping system, and the thermowells were reinforced to avoid the first-order structural resonance. After the modifications, the field measurement data showed that the vibration of the piping system decreased significantly, and the modified piping system has been operating normally for nearly two years.

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Reddy, G. R., K. Suzuki, T. Watanabe et S. C. Mahajan. « Linearization Techniques for Seismic Analysis of Piping System on Friction Support ». Journal of Pressure Vessel Technology 121, n^o 1 (1 février 1999) : 103–8. http://dx.doi.org/10.1115/1.2883656.

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Generally, industrial piping systems are supported on hangers, snubbers, friction supports, etc. Friction supports are used for free thermal expansion of the piping systems. They also have the property to absorb energy from earthquake excitation. In this paper, equivalent linearization techniques such as the Caughey method for bilinear system and the energy method are used to calculate equivalent damping of typical industrial piping system on friction support. These methods are compared in terms of the equivalent damping. An iterative response spectrum method is tried for evaluating response of the piping system using equivalent damping obtained by linearization techniques. Maximum response displacement obtained at friction support is compared with the experimental values. At the end it is concluded that the Caughey method and the energy method evaluate similar damping for the piping on friction support and also concluded that the iterative response spectrum method is easy and reasonable for use in design.

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Lewis, G. D., et Y. J. Chao. « Flexibility of Trunnion Piping Elbows ». Journal of Pressure Vessel Technology 112, n^o 2 (1 mai 1990) : 184–87. http://dx.doi.org/10.1115/1.2928607.

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Trunnion piping elbows are commonly used in piping systems in power and chemical plants. The flexibility of the trunnion piping elbows is normally less than that of the plain piping elbows. In this paper, the finite element method is used to derive the in-plane and out-of-plane flexibility factors of trunnion piping elbows. The results can be easily adopted into the piping flexibility analysis.

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Hatanaka, Hiroaki, Nobukazu Ido, Takuya Ito, Ryota Uemichi, Minoru Tagami et Hirokatsu Nakagawa. « Ultrasonic Creep Damage Detection by Frequency Analysis for Boiler Piping ». Journal of Pressure Vessel Technology 129, n^o 4 (14 juillet 2006) : 713–18. http://dx.doi.org/10.1115/1.2767364.

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Boiler piping of fossil-fuel combustion power generation plants are exposed to high-temperature and high-pressure environments, and failure of high-energy piping due to creep damage has been a concern. Therefore, a precise creep damage assessment method is needed. This paper proposes a nondestructive method for creep damage detection of piping in fossil-fuel combustion power generation plants by ultrasonic testing. Ultrasonic signals are transformed to signals in a frequency domain by Fourier transform, and a specific frequency band is chosen. To determine the creep damage, the spectrum intensities are calculated. Calculated intensities have a good correlation to life consumption of the weld joints, and this method is able to predict the remaining life of high-temperature piping, which has been already installed.

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Chiba, T., et H. Kobayashi. « Response Characteristics of Piping System Supported by Visco-Elastic and Elasto-Plastic Dampers ». Journal of Pressure Vessel Technology 112, n^o 1 (1 février 1990) : 34–38. http://dx.doi.org/10.1115/1.2928583.

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Improving the reliability of the piping systems can be achieved by eliminating the mechanical snubber and by reducing the response of the piping. In the seismic design of piping system, damping is one of the important parameters to reduce the seismic response. It is reported that the energy dissipation at piping supports contributes to increasing the damping ratio of piping system. Visco-elastic damper (VED) and elasto-plastic damper (EPD) were developed as more reliable, high-damping piping supports. The dynamic characteristics of these dampers were studied by the component test and the full-scale piping model test. Damping effect of VED is independent of the piping response and VED can be modeled as a complex spring in the dynamic analysis. On the other hand, damping ratio of piping system supported by EPD increases with the piping response level. So, these dampers are helpful to increase the damping ratio and to reduce the dynamic response of piping system.

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Amy, Daniel G. « Re-constraining massive pied-piping : An argument for non-interrogative CPs ». Proceedings of the Linguistic Society of America 5, n^o 1 (23 mars 2020) : 573. http://dx.doi.org/10.3765/plsa.v5i1.4734.

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Unlike traditional wh-movement and obligatory pied-piping, massive pied-piping is restricted in the types of clauses in which it may occur. Heck (2004, 2008) argues that massive pied-piping constructions are restricted to non-subordinate clauses in English. This paper (i) investigates the availability of massive pied-piping of DPs in complements of know and surprise-type predicates; (ii) proposes a revised generalization on massive pied-piping that restricts the construction to non-interrogative clauses; and (iii) proposes a hybrid analysis that combines Cable's (2010) Q-movement analysis with Den Dikken's (2003) two-stage wh-movement operation, thus accounting for the wider set of environments covered by the revised generalization on massive pied-piping in English.

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Quin˜ones, D. F., R. E. Nickell et D. M. Norris. « Static and Dynamic Analysis of Flaw Stability in Piping Systems ». Journal of Pressure Vessel Technology 112, n^o 3 (1 août 1990) : 204–12. http://dx.doi.org/10.1115/1.2928615.

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Static and dynamic pretest simulations of a degraded nuclear piping test are performed to investigate crack stability and piping integrity. The purpose of this study is to provide system design guidance for a large-diameter piping test and to gain insight on modeling dynamic crack behavior in austenitic and carbon steel base metal and weldments. Combined operating temperature and pressure plus an idealized seismic loading are applied until substantial crack growth, leakage, or pipe guillotining is predicted. The importance of modeling elbow deformation and plasticity is demonstrated.

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(Raj) Sundararajan, C. « Uncertainties in piping frequency analysis ». Fuzzy Sets and Systems 66, n^o 3 (septembre 1994) : 283–92. http://dx.doi.org/10.1016/0165-0114(94)90095-7.

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Jaćimović, Nikola, Fabio D'Agaro, Zdravko Ivančić et Mirjana Stamenić. « On thermoplastic piping stress analysis ». International Journal of Pressure Vessels and Piping 179 (janvier 2020) : 104010. http://dx.doi.org/10.1016/j.ijpvp.2019.104010.

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Lesmez, M. W., D. C. Wiggert et F. J. Hatfield. « Modal Analysis of Vibrations in Liquid-Filled Piping Systems ». Journal of Fluids Engineering 112, n^o 3 (1 septembre 1990) : 311–18. http://dx.doi.org/10.1115/1.2909406.

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The motions of liquid-filled pipe reaches in which long wavelength assumptions are valid can be described by Poisson-coupled axial stress waves in the pipe and in the liquid column, and in the piping structure, by torsional and flexural waves. Based on linearized assumptions, a simultaneous solution of the wave equations is presented. Eigenvalues and mode shapes are derived for the variables fluid pressure and displacements, and pipe forces and displacements. The results are assembled into a transfer matrix, which represents the motion of a single pipe section. Combined with point matrices that describe specified boundary conditions, an overall transfer matrix for a piping system can be assembled. Corresponding state vectors can then be evaluated to predict the piping and liquid motion, and the accompanying forces. The results from two experimental piping systems are compared with the ones obtained by the modal analysis method.

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Phanitwong, Wiriyakorn, et Sutasn Thipprakmas. « Finite element analysis of piping defect formation in the sheet-extrusion process ». International Journal of Modeling, Simulation, and Scientific Computing 06, n^o 01 (mars 2015) : 1550010. http://dx.doi.org/10.1142/s1793962315500105.

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The pressing process, as compared to the machining process, makes good utilization of work piece material and shortens the production time, and as such it is increasingly used for production of complex shaped parts. A particular type of pressing is sheet-extrusion which controls the flow of material into special punch and die sets to produce an extruded shape. However, some particularly complex shaped parts cannot be made by sheet-extrusion due to the formation of piping defects. In this study, the finite element method (FEM) was used to investigate the formation of piping defects. In addition, the relationship between the characteristic dimensions of the extruded shape and the piping defect was also examined. Laboratory pressing experiments were performed to validate the accuracy of the FEM simulation results. Based on the stress distribution and velocity profiles within the extruded work piece, the relationship between the extruded shape and the piping defect was clearly identified. Furthermore, the FEM simulation results showed good agreement with the experimental results with regards to the dimensions of the extruded shape and the piping defect.

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Du, Xian He, et Ying Hua Liu. « Plastic Limit Analysis of Piping with Local Wall-Thinning under Elevated Temperature ». Key Engineering Materials 725 (décembre 2016) : 47–52. http://dx.doi.org/10.4028/www.scientific.net/kem.725.47.

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In order to evaluate the safety and integrity of piping with local wall-thinning at elevated temperature, a numerical method for plastic limit load of modified 9Cr-1Mo steel piping is proposed in the present paper. The limit load of piping at high temperature is defined as the load-carrying capacity after the structure has served for a certain time period. The power law creep behavior with Liu-Murakami damage model is implemented into the commercial software ABAQUS via CREEP for simulation, and the Ramberg-Osgood model is modified to consider the material deterioration effect of modified 9Cr-1Mo steel by introducing the creep damage factor into the elasto-plastic constitutive equation. For covering the wide ranges of defect ratios and service time periods, various 3-D numerical examples for the piping with local wall-thinning defects, and creep time are calculated and analyzed. The limit loads of the defected structures under high temperature are obtained through classic zero curvature criterion with the modified Ramberg-Osgood model, and the typical failure modes of these piping are also discussed. The results show that the plastic limit load of piping containing defect at elevated temperature depends not only on the size of defect, but also on the creep time, which is different from the traditional plastic limit analysis at room temperature without material deterioration.

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Chiba, T., et R. Koyanagi. « Dynamic Response Studies of Piping-Support Systems ». Journal of Pressure Vessel Technology 112, n^o 1 (1 février 1990) : 39–45. http://dx.doi.org/10.1115/1.2928584.

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Considering the effect of the interaction between piping and support systems in the piping design is a more integrated approach to improve the reliability of piping systems. So, it is important to clarify the dynamic characteristics of the piping and the restraint structure during the seismic events. It may be desirable to investigate the effect of the gap on the response and the local stress of the piping systems. The dynamic characteristics of a simplified piping model with gaps was investigated by the tests and the analysis. Three-dimensional piping model test was performed to estimate the effect of the gap on the response of the piping system. It can be found that the local stress and the stiffness of the piping and the restraint structure under the seismic loadings should be considered in the seismic design. The gap size was not so effective on the response of the 3-dimensional piping system in the high-level response.

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Hwang, Se-Yun, Min-Seok Kim et Jang-Hyun Lee. « Thermal Stress Analysis of Process Piping System Installed on LNG Vessel Subject to Hull Design Loads ». Journal of Marine Science and Engineering 8, n^o 11 (16 novembre 2020) : 926. http://dx.doi.org/10.3390/jmse8110926.

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In this paper, the procedure for the strength evaluation of the piping system installed on liquefied natural gas (LNG) carriers is discussed. A procedure that accounts for the ship’s wave load and hull motion acceleration (as well as the deformation due to the thermal expansion and contraction experienced by the hull during seafaring operations) is presented. The load due to the temperature and self-weight of the piping installed on the deck is also considered. Various operating and load conditions of the LNG piping system are analyzed. Stress analysis is performed by combining various conditions of sustained, occasional, and expansion loads. Stress is assessed using finite element analysis based on beam elements that represent the behavior of the piping. The attributes of the piping system components (such as valves, expansion joints, and supports) are represented in the finite element model while CAESAR-II, a commercial software is used for finite element analysis. Component modeling, load assignment, and load combinations are presented to evaluate pipe stresses under various load conditions. An evaluation model is selected for the piping arrangement of LNG and the evaluated stress is compared with the allowable stress defined by the American Society of Mechanical Engineers (ASME).

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Aswin, Aswin, et Ahmad Hasnan. « STRESS ANALYSIS EVALUATION AND PIPE SUPPORT TYPE ON HIGH-PRESSURE AND TEMPERATURE STEAM PIPE ». International Journal of Mechanical Engineering Technologies and Applications 4, n^o 1 (31 janvier 2023) : 31–38. http://dx.doi.org/10.21776/mechta.2023.004.01.4.

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The design and analysis of piping systems are critical in the power and process industries. The steam pipe is one of the main requirements for the plant to be installed. High-pressure and high-temperature steam pipes in the piping system are critical lines that need to be subjected to stress analysis. This study aims to evaluate the stress and the effect of using pipe supports on the stress in the piping system. Stress analysis is needed to ensure that the piping system that is designed is safe and does not exceed the allowable stress under operating conditions. Data analysis used ASTM A335-P11 as a pipe material with a design pressure of 65 bars and a design temperature of 480 °C. Stress analysis was carried out using CAESAR II software, which refers to ASME B31.3 process piping standards and codes. The findings revealed that the type of support chosen, such as the gap and distance of pipe support, has a significant impact on the stress value in the piping system. The results of the analysis are carried out several times to get the stress value so that it does not exceed the allowable stress. The greatest stress value occurs at the expansion load condition in the steam pipe system design. The chosen piping system design has a ratio of 93.6%, which is located at node 220 with a stress value of 35889.1 psi and an allowable stress of 38327.2 psi. Because the stress value that occurs is below the allowable stress, the steam pipe system is safe to be installed and operated.

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Schott, G. A., G. M. Hulbert et C. F. Heberling. « Results From Dynamic Tests and Analyses of a Medium Diameter LMFBR Piping System ». Journal of Pressure Vessel Technology 108, n^o 3 (1 août 1986) : 330–33. http://dx.doi.org/10.1115/1.3264793.

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This paper presents results and observations from dynamic tests and analyses performed on an 8-in. (0.20-m) diameter, thin-walled piping system. The piping system is a scaled representation of a Liquid Metal Fast Breeder Reactor (LMFBR) large diameter piping loop. Prototypic piping restraints were employed, including mechanical snubbers, rigid struts, pipe hangers and nonintegral pipe clamps. Snap-back, sine-sweep and seismic tests were performed for various restraint configurations and piping conditions. The test results are compared to analytical predictions for verification of the methods and models used in the seismic design of LMFBR piping systems. Test program conclusions and general recommendations for piping seismic analyses are presented along with a discussion of test and analysis results.

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Chang, Seongkyu, Weipeng Sun, Sung Gook Cho et Dookie Kim. « Vibration Control of Nuclear Power Plant Piping System Using Stockbridge Damper under Earthquakes ». Science and Technology of Nuclear Installations 2016 (2016) : 1–12. http://dx.doi.org/10.1155/2016/5014093.

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Generally the piping system of a nuclear power plant (NPP) has to be designed for normal loads such as dead weight, internal pressure, temperature, and accidental loads such as earthquake. In the proposed paper, effect of Stockbridge damper to mitigate the response of piping system of NPP subjected to earthquake is studied. Finite element analysis of piping system with and without Stockbridge damper using commercial software SAP2000 is performed. Vertical and horizontal components of earthquakes such as El Centro, California, and Northridge are used in the piping analysis. A sine sweep wave is also used to investigate the control effects on the piping system under wide frequency range. It is found that the proposed Stockbridge damper can reduce the seismic response of piping system subjected to earthquake loading.

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Parulekar, Y. M., G. R. Reddy, K. K. Vaze et K. Muthumani. « Passive Control of Seismic Response of Piping Systems ». Journal of Pressure Vessel Technology 128, n^o 3 (30 août 2005) : 364–69. http://dx.doi.org/10.1115/1.2217969.

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Passive energy dissipating devices, such as elastoplastic dampers (EPDs) can be used for eliminating snubbers and reducing the response of piping systems subjected to seismic loads. Cantilever and three-dimensional piping systems were tested with and without EPD on shaker table. Using a finite element model of the piping systems, linear and nonlinear time-history analysis is carried out using Newmark’s time integration technique. Equivalent linearization technique, such as Caughey method, is used to evaluate the equivalent damping of the piping systems supported on elastoplastic damper. An iterative response spectrum method is used for evaluating response of the piping system using this equivalent damping. The analytical maximum response displacement obtained at the elastoplastic damper support for the two piping systems is compared with experimental values and time history analysis values. It has been concluded that the iterative response spectrum technique using Caughey equivalent damping is simple and results in reasonably acceptable response of the piping systems supported on EPD.

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Kwag, Shinyoung, YongHee Ryu et Bu-Seog Ju. « Efficient Seismic Fragility Analysis for Large-Scale Piping System Utilizing Bayesian Approach ». Applied Sciences 10, n^o 4 (23 février 2020) : 1515. http://dx.doi.org/10.3390/app10041515.

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In the event of an earthquake, it is essential to accurately assess the seismic fragility of piping systems to ensure the continued safety of society. When evaluating the seismic fragility of a piping system, which is generally a secondary structural system, this should mainly be an integrated model that includes both the primary structural frames and the secondary ones, unlike the primary structural system of a building. Hence, the piping seismic fragility evaluation has an issue in that it takes considerable computational time because numerical analyses must be performed on a relatively complex model. Given this background, the purpose of this study is to propose an efficient piping seismic fragility analysis method by utilizing the existing seismic fragility analysis method and the Bayesian updating concept. In order to verify the validity of the proposed method, it was applied to a building–piping coupled structural system example, and its results were analyzed and compared with the results of the existing method in terms of accuracy and efficiency. As a result, the proposed method showed a similar accuracy compared with the existing method while significantly reducing the numerical cost of nonlinear seismic response analyses necessary for these results.

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Kim, Jinman, Heuisoo Han et Yoonhwa Jin. « Analysis of Pore Water Pressure and Piping of Hydraulic Well ». Water 13, n^o 4 (15 février 2021) : 502. http://dx.doi.org/10.3390/w13040502.

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This paper shows the results of a field appliance study of the hydraulic well method to prevent embankment piping, which is proposed by the Japanese Matsuyama River National Highway Office. The large-scale embankment experiment and seepage analysis were conducted to examine the hydraulic well. The experimental procedure is focused on the pore water pressure. The water levels of the hydraulic well were compared with pore water pressure data, which were used to look over the seepage variations. Two different types of large-scale experiments were conducted according to the installation points of hydraulic wells. The seepage velocity results by the experiment were almost similar to those of the analyses. Further, the pore water pressure oriented from the water level variations in the hydraulic well showed similar patterns between the experiment and numerical analysis; however, deeper from the surface, the larger pore water pressure of the numerical analysis was calculated compared to the experimental values. In addition, the piping effect according to the water level and location of the hydraulic well was quantitatively examined for an embankment having a piping guide part. As a result of applying the hydraulic well to the point where piping occurred, the hydraulic well with a 1.0 m water level reduced the seepage velocity by up to 86%. This is because the difference in the water level between the riverside and the protected side is reduced, and it resulted in reducing the seepage pressure. As a result of the theoretical and numerical hydraulic gradient analysis according to the change in the water level of the hydraulic well, the hydraulic gradient decreased linearly according to the water level of the hydraulic well. From the results according to the location of the hydraulic well, installation of it at the point where piping occurred was found to be the most effective. A hydraulic well is a good device for preventing the piping of an embankment if it is installed at the piping point and the proper water level of the hydraulic well is applied.

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Govindaraj, P., et Mouleeswaran Senthilkumar. « Performance Analysis of Thin Shell Bends under High Pressure and Temperature ». Applied Mechanics and Materials 787 (août 2015) : 296–300. http://dx.doi.org/10.4028/www.scientific.net/amm.787.296.

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Around 70% of the cost in piping industry is spent in the pipe manufacturing with optimum design of pipes without defects. Research on design of pipes has gained importance from the last decade. There are numerous methods being developed to improve the efficiency of piping units considering various parameters. The pipe tends to flatten when they are forced to bend, this geometrical changes has a significant role in the acceptability criteria of pipes. It is necessary to bend pipes in order to transmit liquid or gas from one place to other place. In this work special attention is given to pipe bends because of high stress concentration due to various loading conditions. From several kinds of piping systems, process piping systems are chosen for analysis since pipes used here transport important and hazardous materials. Damage to such piping system can cause serious loss to economy and human lives. The geometrical imperfection associated with bending of pipes is ovality. This degree of ovality determines the acceptance of pipes. Thickening and thinning effects cause additional problems like large plastic deformation and loss of flexibility respectively. Hence estimation of the best degree of ovality is required. In this work effect of ovality is estimated by taking the internal fluid pressure and In plane bending moment into account.

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Miura, Naoki, Katsumasa Miyazaki, Masakazu Hisatsune, Kunio Hasegawa et Koichi Kashima. « Ductile Fracture Behaviour of Class 2 and 3 LWR Piping and Its Implications for Flaw Evaluation Criteria ». Solid State Phenomena 120 (février 2007) : 85–94. http://dx.doi.org/10.4028/www.scientific.net/ssp.120.85.

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To achieve a rational maintenance program for aged Light Water Reactor components, it is important to establish and to improve the flaw evaluation criteria. The current flaw evaluation criteria such as ASME Boiler and Pressure Vessel Code Section XI are focused on Class 1 piping which usually shows relatively higher toughness. On the other hand, flaw evaluation criteria suitable for Class 2, 3 piping with moderate-toughness are also required because some Class 2, 3 piping systems are as important to plant safety analysis as Class 1 piping. In this study, both analytical and experimental studies were conducted to provide the evaluation method of fracture loads for acceptance criteria for Class 2, 3 piping. Pipe fracture tests by four-point bending were conducted on circumferentially cracked carbon steel pipes with moderate-toughness. The Net-Section Collapse criterion overpredicted experimental maximum loads for through-wall-cracked pipes, which suggested the necessity of Z-factor. Three-dimensional finite element analysis and simplified analysis based on the reference stress method were conducted to complement the limited pipe fracture tests. It was ascertained that the reference stress method always gave moderately conservative fracture loads compared with the finite element analysis and pipe fracture tests as well. Z-factor for Class 2, 3 piping was then derived and formulated using the reference stress method. Z for Class 2, 3 piping was affected by radius-to-thickness ratio, and was higher than Z for Class 1 piping in the present codes.

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Zhang, Xiao Yue, et Jun Yan. « Dynamic Simulation of Sluice Foundation Piping Using Variable Grid Method ». Advanced Materials Research 446-449 (janvier 2012) : 900–905. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.900.

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The occurrence of underground piping is a pluralistic and complex problem. Due to the great difficulty of the 3D dynamic simulation of piping both by theoretical and numerical analysis, currently there is no satisfactory mathematical model and numerical analysis software for it. In order to simulate the piping development process of sluice or dike foundation, in this paper, the 3D steady-unsteady saturated-unsaturated FEM seepage simulation method is used, and the concepts of destroyed element and variable grid method are introduced. The destroyed elements are removed from the original grid during the iterative calculation process, and the corresponding procedure for the 3D steady-unsteady piping process of sluice foundation is designed. Using appropriate post-processing program, the whole piping development of a sluice foundation can be displayed. A piping test of a sluice foundation model is simulated by the method provided in this paper. For the comparison of the experimental result and the simulation result, they showed very good agreement, which can verify the correctness of the piping simulation and programming methods given in this paper.

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Yee, Raymond K., et Marvin J. Cohn. « Creep Relaxation Behavior of High-Energy Piping ». Journal of Pressure Vessel Technology 122, n^o 4 (24 juillet 2000) : 488–93. http://dx.doi.org/10.1115/1.1311958.

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The analysis of the elastic stresses in high-energy piping systems is a routine calculation in the power and petrochemical industries. The American Society of Mechanical Engineers (ASME) B31.1 Power Piping Code was developed for safe design and construction of pressure piping. Postconstruction issues, such as stress relaxation effects and selection of maximum expected creep damage locations, are not addressed in the Code. It has been expensive and time consuming to evaluate creep relaxation stresses in high energy piping systems, such as main steam and hot reheat piping. After prolonged operation of high-energy piping systems at elevated temperatures, it is very difficult to evaluate the redistribution of stresses due to dead weight, pressure, external loading, and thermal loading. The evaluation of stress relaxation and redistribution is especially important when nonideal conditions, such as bottomed-out or topped-out hangers, exist in piping systems. This paper uses three-dimensional four-node quadrilateral shell elements in the ABAQUS finite element code to evaluate the time for relaxation and the nominal relaxation stress values for a portion of a typical high-energy piping system subject to an ideally loaded hanger or to an overloaded hanger. The stress relaxation results are evaluated to suggest an approximation using elastic stress analysis results. [S0094-9930(00)01304-4]

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MJ, Safruddin, et Sawarni Hasibuan. « Strategi mitigasi risiko proyek konstruksi utilitas piping dan sipil : Studi kasus PDAM Jakarta ». Operations Excellence : Journal of Applied Industrial Engineering 12, n^o 1 (26 mars 2020) : 74. http://dx.doi.org/10.22441/oe.2020.v12.i1.007.

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Construction activities such as piping and civil works utilities always potentially pose a risk. Therefore, risk management is indispensable for the success of a construction project. The pipeline and Civil works construction project to meet the distribution of clean water needs in Jakarta through the Cooperation Agreement PDAM Pam Jaya and PT Pam Lyonnaise Jaya (Palyja) potentially generate various risks. The purpose of this research is to analyse risk management on piping and civil works utility construction using the house of risk model. Research is conducted through two phases. The first phase is the identification of risks and risk agents in the piping and civil works utility construction through the measurement of severity and occurrence levels to produce an aggregate risk priority (ARP), then conducts a risk mitigation analysis in the second phase. 60 respondents involved in the study consisting of project managers, supervisors, and engineers on pipeline and civil works construction projects. The results of the analysis successfully identified 60 risk events and 38 risk agents in the construction of utility piping and work civil PDAM Pam Jaya. FGD and Pareto analysis used in the study produced five recommendations for mitigation actions that are expected to be able to mitigate risk on piping and civil utility construction by establishing QA/QC independently/cooperation, take corrective action (corrective action), conduct testing or testing with the applicable provisions, implement ISO certification of 9001:2015 quality management, and perform training on procedures and standards that apply periodically.

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Příhoda, Miroslav, Mária Čarnogurská, René Pyszko, Emil Hlisnikowski et Jiří Burda. « Heat Loss Analysis of Outdoor Piping ». MATEC Web of Conferences 328 (2020) : 03006. http://dx.doi.org/10.1051/matecconf/202032803006.

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Although the heat losses of the outdoor piping are minimised by thermal insulation, the distribution of heat from the heating plant to individual consumers of the technological heating media is always accompanied by losses. In the case of large transported volumes of the flowing media, the loss values are negligible. The mathematical and physical analysis of the heat loss of the outdoor heat distribution systems, insulated and non-insulated, has been carried out while using the parameters measured on the real piping system.

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Foster, Mark, Robin Fell et Matt Spannagle. « A method for assessing the relative likelihood of failure of embankment dams by piping ». Canadian Geotechnical Journal 37, n^o 5 (1 octobre 2000) : 1025–61. http://dx.doi.org/10.1139/t00-029.

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A method for estimating the relative likelihood of failure of embankment dams by piping, the University of New South Wales (UNSW) method, is based on an analysis of historic failures and accidents in embankment dams. The likelihood of failure of a dam by piping is estimated by adjusting the historical frequency of piping failure by weighting factors which take into account the dam zoning, filters, age of the dam, core soil types, compaction, foundation geology, dam performance, and monitoring and surveillance. The method is intended only for preliminary assessments, as a ranking method for portfolio risk assessments, to identify dams to prioritise for more detailed studies, and as a check on event-tree methods. Information about the time interval in which piping failure developed and the warning signs which were observed suggest that the piping process often develops rapidly, giving little time for remedial action. In the piping accidents, the piping process reached some limiting condition allowing sufficient time to draw down the reservoir or carry out remedial works to prevent breaching.Key words: dams, failures, risk, probability, piping.

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Pickett, M. A., D. J. Cunningham, S. K. Sinha et J. Madia. « Application of the Ritz Averaging Method in the Analysis of the Seismic Performance of Piping Systems ». Journal of Pressure Vessel Technology 109, n^o 3 (1 août 1987) : 315–22. http://dx.doi.org/10.1115/1.3264871.

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The Ritz averaging method is utilized to reduce the nonlinear characteristics of piping system supports (snubbers) to equivalent linear support stiffnesses during seismic excitation. The equivalent snubber support stiffnesses are used in seismic modal analyses of two piping systems. The analyses are performed in order to determine the effect that high snubber lockup velocities have on piping system stresses. The results show that the lockup velocity of snubbers in the systems analyzed can be safely allowed to increase above normal limits without any significant increase in nodal stresses.

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Fujita, Katsuhisa, Tetsuya Kimura et Yoshikazu Ohe. « Seismic Response Analysis of Piping Systems With Nonlinear Supports Using Differential Algebraic Equations ». Journal of Pressure Vessel Technology 126, n^o 1 (1 février 2004) : 91–97. http://dx.doi.org/10.1115/1.1634589.

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Hysteresis elements such as elasto-plastic dampers are important elements for mechanical structures, especially for earthquake-proof structures. When such nonlinear supports are utilized for piping systems, the nonlinearities of the hysteresis elements and the geometrical complexity of the piping systems lead to complicated seismic responses, and thus further studies are required in order to enhance the reliability of the earthquake-proof design. In the seismic response analysis, the method of time history response analysis is widely used. In this paper, a method of nonlinear seismic response analysis for a piping systems using a combination of the FEM and the Differential Algebraic Equations (DAE) is proposed. As it is well known, the DAE is suitable for numerical analysis of time history responses for mechanical structures and machinery elements. According to the advantage of the DAE, the numerical modeling and simulation of a complex piping systems supported by the hysteresis elements can be easily carried out by using the proposed method. In order to verify the usefulness of the method, the time history responses of piping systems supported by a elasto-plastic damper is examined for seismic excitation by using the proposed method. The damper is modeled as a bilinear model. The effects of the second stiffness and the stiffness associated with the plastic deformation of the damper on the seismic responses are investigated using an actually recorded earthquake motion.

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Veiga, Jordana Luiza Barbosa da Costa. « When perform a piping flexibility analysis ? » Rio Oil and Gas Expo and Conference 20, n^o 2020 (1 décembre 2020) : 241–42. http://dx.doi.org/10.48072/2525-7579.rog.2020.241.

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YOSHIMURA, Takuya, Masaki ENDO et Eizirou INAMURA. « Analysis of Piping Vibration using FEM ». Proceedings of the Fluids engineering conference 2018 (2018) : OS7–4. http://dx.doi.org/10.1299/jsmefed.2018.os7-4.

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Hassan, Tasnim, Yimin Zhu et Vernon C. Matzen. « Improved ratcheting analysis of piping components ». International Journal of Pressure Vessels and Piping 75, n^o 8 (juin 1998) : 643–52. http://dx.doi.org/10.1016/s0308-0161(98)00070-2.

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Pérez, Daniel Molina, Lemuel C. Ramos-Arzola et Amadelis Quesada Torres. « Pressure-Dependent Models in Ship Piping Systems ». Journal of Marine Science and Application 19, n^o 2 (juin 2020) : 266–74. http://dx.doi.org/10.1007/s11804-020-00146-2.

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Abstract This paper aims to evaluate the feasibility of pressure-dependent models in the design of ship piping systems. For this purpose, a complex ship piping system is designed to operate in firefighting and bilge services through jet pumps. The system is solved as pressure-dependent model by the piping system analysis software EPANET and by a mathematical approach involving a piping network model. This results in a functional system that guarantees the recommendable ranges of hydraulic state variables (flow and pressure) and compliance with the rules of ship classification societies. Through this research, the suitability and viability of pressure-dependent models in the simulation of a ship piping system are proven.

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Belytschko, T., M. Karabin et J. I. Lin. « Fluid-Structure Interaction in Waterhammer Response of Flexible Piping ». Journal of Pressure Vessel Technology 108, n^o 3 (1 août 1986) : 249–55. http://dx.doi.org/10.1115/1.3264783.

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In the waterhammer analysis of piping systems, incompressible (or added mass) representations are generally used in computing the response of the piping. It is shown that this procedure is not necessarily conservative, particularly for thin-walled, flexible piping systems, and that fully coupled fluid-structure solutions can predict higher loads and stresses. A modal recovery procedure which easily permits the representation on the acoustic effects of the fluid to be included in a structural model is also presented. Results are given for both simple models and a piping system from an LMFBR design.

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Fu, Guo Hong, et Tian Chun Yang. « Theoretical Analysis of Magnetic-Electric Prospecting Method for Piping and Seepage Detection of Dyke ». Applied Mechanics and Materials 103 (septembre 2011) : 587–91. http://dx.doi.org/10.4028/www.scientific.net/amm.103.587.

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On the basis of presenting the piping and seepage detection by magnetic-electric prospecting method, the authors analyzed and testified validity of the method. According to calculated results, the magnitude of magnetic field of artificial current was smaller on section if electrodes and cables were set rationally. Usually, the magnetic field magnitude of piping had several times to more than decuple comparing with magnetic field of artificial current. So, the magnetic abnormity could be detected easily by high-precision magnetometers. At the same time, their curves’ characteristics were different evidently. The analysis result shows that the piping and seepage of dyke can be detected by combining method of direct current supplying and high-precision magnetic survey.

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Ryu, Yonghee, Shinyoung Kwag et Bu‐Seog Ju. « Fragility Assessments of Multi-Story Piping Systems within a Seismically Isolated Low-Rise Building ». Sustainability 10, n^o 10 (19 octobre 2018) : 3775. http://dx.doi.org/10.3390/su10103775.

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A successful, advanced safety design method for building and piping structures is related to its functionality and sustainability in beyond-design-basis events such as extremely strong ground motions. This study develops analytical models of seismically isolated building-piping systems in which multi-story piping systems are installed in non-isolated and base-isolated, low-rise buildings. To achieve the sustainable design of a multi-story piping system subjected to strong ground motions, Triple Friction Pendulum (TFP) elements, specifically TFP bearings, were incorporated into the latter building structure. Then, a seismic fragility analysis was performed in consideration of the uncertainty of the seismic ground motions, and the piping fragilities for the seismically non-isolated and the base-isolated building models were quantified. Here, the failure probability of the piping system in the non-isolated building was greater than that in the seismically isolated building. The seismic isolation design of the building improved the sustainability and functionality of the piping system by significantly reducing the seismic energy of extreme ground motions which was input to the building structure itself.

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Kobayashi, H., R. Yokoi, T. Chiba, K. Suzuki, N. Shimizu et C. Minowa. « Experimental Study on Seismic Responses of Piping Systems With Friction—Part 2 : Simplified Analysis Method on the Effect of Friction ». Journal of Pressure Vessel Technology 117, n^o 3 (1 août 1995) : 250–55. http://dx.doi.org/10.1115/1.2842119.

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Friction between pipe and support structure is generally known to reduce seismic response of the piping systems. Vibration tests using large-scale piping model with friction support were carried out to evaluate the reduction effect. The piping response was mainly governed by the first modal deformation. The simplified analysis method based on linear response spectrum analysis was developed and confirmed to be applicable. In this method, the reduction effect by friction is treated as equivalent viscous damping ratio. This paper deals with the analysis method, and the comparison between the experimental results and analytical ones.

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Watanabe, O., et H. Ohtsubo. « A Simplified Analysis Method for Complex Piping Systems in Elastic-Plastic-Creep Range ». Journal of Pressure Vessel Technology 107, n^o 2 (1 mai 1985) : 148–56. http://dx.doi.org/10.1115/1.3264427.

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The present paper describes a simplified finite element method for analysis of behavior of complex piping systems under elevated temperature. Elastic-plastic-creep deformations of a piping system under a combined moment loading can be analyzed by the present method. The system is idealized by straight and curved beams, and derivation of the finite element equation is based on the force method. The unified constitutive relations are used for creep and plastic behavior, where plastic deformation is treated as a limiting case of creep. The numerical results are compared with previous experimental ones, which verifies the validity of the proposed method. Elastic follow-up problem of a piping system of actually complex configuration is also solved by the present method.

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Zhang, Jin. « Simulation of Piping Process Based on Coupling Seepage and Erosion ». Applied Mechanics and Materials 602-605 (août 2014) : 558–61. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.558.

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Only the preliminary stage of piping process can be simulated by current seepage-erosion coupled piping model. In order to enhance the simulation capability, a modified piping model is presented. Theory analysis shows that the governing equations of the modified piping model have significant advantages in practicality and solution accuracy. The solving process of the model is analyzed, with the result showing that the out-of-bounds appearance of the field variables is the major factor interrupting the solving process. Then a new solution technique called dynamic constraint is proposed, which can ensure the validity of field variables. Numerical example indicates that the new governing equations and dynamic constraint technique can enormously enhance the simulation capability of the model, and the piping process can be effectively simulated.

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Jing, Yuanlin, Feng Guo, Yiping Wang et Qunwu Huang. « Influence of Piping on On-Line Continuous Weighing of Materials inside Process Equipment : Theoretical Analysis and Experimental Verification ». Applied Sciences 11, n^o 11 (4 juin 2021) : 5246. http://dx.doi.org/10.3390/app11115246.

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Due to the continuity and complexity of chemical systems, piping and operating conditions will have a significant effect on the on-line continuous weighing of materials inside process equipment. In this paper, a mathematical model of the weighing system considering piping and operating conditions was established based on the gas–liquid continuous heat transfer weighing process. A theoretical criterion which can be extended to any continuous weighing system of the materials inside equipment with connected piping is obtained through the mechanical derivation between the material mass, the cantilever beam deflection, the strain gage deformation, and the bridge output voltage. This criterion can effectively predict the influence of piping on weighing results with specific accuracy, and provide a basis for engineering optimization design. On this basis, a set of gas–liquid continuous contact weighing devices was built. The static/dynamic experimental results showed that the accuracy of the system meets the set requirements.

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