Relevant bibliographies by topics / Flexible Pipes

Contents

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

Academic literature on the topic 'Flexible Pipes'

Author: Grafiati
Published: 4 June 2021
Last updated: 21 February 2023

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Journal articles on the topic "Flexible Pipes"

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Doroshenko, Ya V., V. A. Kucheriaviy, N. M. Andriishyn, S. M. Stetsiuk, and Yu M. Levkovych. "Modern Technologies of the Construction of Field Oil-and-Gas Pipelines." Prospecting and Development of Oil and Gas Fields, no. 3(72) (September 30, 2019): 19–31. http://dx.doi.org/10.31471/1993-9973-2019-3(72)-19-31.

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Foreign experience in the construction of industrial pipelines of flexible composite pipes for the transportation of hydrocarbons is considered. The expediency of using such pipes in the gas-oil complex of Ukraine is substantiated. The designs of flexible composite pipes are described, a brief description of their construction materials is given, the advantages of these pipes over steel ones are considered. The largest manufacturers of flexible composite pipes are listed and the technical specifications of their products are indicated. Schemes and methods for laying flexible composite pipelines are considered. The technology of preparing flexible composite pipes for transportation is described and the means used for handling are given. The requirements as to trenching for laying single and multi-stranded flexible composite pipelines are described. The article presents the technologies and tools used to unwind flexible composite pipes from reels and coils before laying them. The methods of connecting flexible composite pipes to each other and to technological equipment, steel pipes, and Xmas-trees are analyzed. The designs of union fittings are considered and the technology of their installation is described. The authors consider methods, technologies and requirements for laying flexible composite pipelines in a trench, their ground laying and laying at the point where the flexible composite pipe exits to the ground for attachment to a steel pipe or technological equipment. The article presents the features of laying flexible composite pipelines through highways, water barriers and swamps by both trench and trenchless technologies, features of trenchless reconstruction of defective, worn steel pipelines with flexible composite pipes, and features of pigging flexible composite pipes and their trying out.
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Goto, Y., T. Okamoto, M. Araki, and T. Fuku. "Analytical Study of the Mechanical Strength of Flexible Pipes." Journal of Offshore Mechanics and Arctic Engineering 109, no. 3 (August 1, 1987): 249–53. http://dx.doi.org/10.1115/1.3257017.

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Although flexible pipes have already been in wide use in the offshore industry, studies on their mechanical strength are few and far between, and their industrial standards are yet to be established. This paper describes the analytical methods employed in determining the mechanical strength of flexible pipes and also discusses test data that delineate the characteristics of flexible pipes. The axial, torsional and crushing strength of flexible pipes is studied along with their damaging bending on the basis of our results of analysis and testing. The coincidence of the results of theoretical analysis with test results indicates that our analytical methods provide a useful tool for determining the design mechanical strength of flexible pipes.
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Oshman, Christopher, Qian Li, Li-Anne Liew, Ronggui Yang, Victor M. Bright, and Y. C. Lee. "Flat flexible polymer heat pipes." Journal of Micromechanics and Microengineering 23, no. 1 (November 30, 2012): 015001. http://dx.doi.org/10.1088/0960-1317/23/1/015001.

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de Sousa, José Renato M., Fernando J. M. de Sousa, Marcos Q. de Siqueira, Luís V. S. Sagrilo, and Carlos Alberto D. de Lemos. "A Theoretical Approach to Predict the Fatigue Life of Flexible Pipes." Journal of Applied Mathematics 2012 (2012): 1–29. http://dx.doi.org/10.1155/2012/983819.

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This paper focuses on a theoretical approach to access the fatigue life of flexible pipes. This methodology employs functions that convert forces and moments obtained in time-domain global analyses into stresses in their tensile armors. The stresses are then processed by well-known cycle counting methods, andS-Ncurves are used to evaluate the fatigue damage at several points in the pipe’s cross-section. Finally, Palmgren-Miner linear damage hypothesis is assumed in order to calculate the accumulated fatigue damage. A study on the fatigue life of a flexible pipe employing this methodology is presented. The main points addressed in the study are the influence of friction between layers, the effect of the annulus conditions, the importance of evaluating the fatigue life in various points of the pipe’s cross-section, and the effect of mean stresses. The results obtained suggest that the friction between layers and the annulus conditions strongly influences the fatigue life of flexible pipes. Moreover, mean stress effects are also significant, and at least half of the wires in each analyzed section of the pipe must be considered in a typical fatigue analysis.
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Suleiman, M. T., R. A. Lohnes, T. J. Wipf, and F. W. Klaiber. "Analysis of Deeply Buried Flexible Pipes." Transportation Research Record: Journal of the Transportation Research Board 1849, no. 1 (January 2003): 124–34. http://dx.doi.org/10.3141/1849-14.

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CANDE is one of the most commonly used programs for analysis of buried pipe; however, CANDE is limited to applications with small deflections. This limitation is typically not problematic, but there are some instances in which analysts may be interested in large-deflection behavior. This limitation led to the consideration of other analysis tools. In this study ANSYS, a general finite element program, was used to model the soil-pipe system. Small- and large-deflection theories of ANSYS were used in the analysis of several case studies, and the results were compared with those of CANDE. Also, a code was written to run within ANSYS to include the following soil constitutive models: the hyperbolic tangent modulus with both power and hyperbolic bulk modulus. Results obtained using ANSYS with the modified soil models were in good agreement, with less than 10% difference, except in one case: CANDE results for 6.1 m of soil cover above the springline for 610-mm pipe diameter with SM and ML soils. Use of large-deflection theory resulted in an insignificant effect, less than 5%, when compared with ANSYS small-deflection theory results for soil heights up to 6.1 m above the springline, which proves that small-deflection theory is adequate for these cases. Comparing CANDE and ANSYS for 1,200-mm-diameter polythylene (PE) pipes with experimental results showed that ANSYS more accurately describes the PE pipe behavior for cases of 9 m of soil cover or more and that large-deflection theory describes the PE pipe behavior better than small-deflection theory for a vertical deflection of 4% or more. The pipe material effect was investigated by comparing the results of ANSYS small- and large-deflection theories for both PE and polyvinyl chloride pipes. The difference between the small- and large-deflection theories for both pipe materials becomes significant, more than 10%, at a vertical deflection of 4%.
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Knodel, PC, CA Moore, and CF Donaldson. "Measuring Strains in Buried Flexible Pipes." Geotechnical Testing Journal 13, no. 3 (1990): 208. http://dx.doi.org/10.1520/gtj10159j.

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Ghobarah, A., and W. K. Tso. "Behaviour of buried small flexible pipes." Canadian Journal of Civil Engineering 15, no. 3 (June 1, 1988): 486–89. http://dx.doi.org/10.1139/l88-065.

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An analytical and experimental investigation was conducted to study the behaviour of buried small diameter flexible plastic drain pipes when subjected to surface wheel loads. Tests were conducted on drain pipes buried under sand and also typical agriculture soil samples from Southern Ontario. In addition to soil types, the effect of soil compaction on the stresses and deformation of the pipe was evaluated.It was found that the modulus of soil reaction is highly dependent on the degree of compaction of the soil adjacent to the pipe. By using compacted sand around the pipe, the modulus of soil reaction can be increased significantly, thereby reducing the deformation of the pipe. Using the appropriate value of the modulus of soil reaction, it is shown that theoretical predictions of pipe deformation correlate well with test measurements. Key words: plastic, flexible, buried, pipe, experimental, deformation.
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Sivakumar Babu, G. L., and Rajaparthy S. Rao. "Reliability measures for buried flexible pipes." Canadian Geotechnical Journal 42, no. 2 (April 1, 2005): 541–49. http://dx.doi.org/10.1139/t04-116.

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The safety of infrastructure facilities such as buried pipelines is the primary objective of engineering design. An improved measure of safety and reliability of these structures can be obtained with concepts of probability. The assessment of safety involves uncertainties at various stages, such as testing, design, and field installation and operations. This paper presents a reliability analysis to estimate the deflection (cross-sectional ovalization) and buckling response of buried flexible pipes, considering uncertainties in the design parameters. The need to consider variations in design parameters, such as soil modulus and bulk density of the fill, and the influence of correlation between soil modulus and bulk density in the estimation of reliability is emphasized. It was observed that reliability index decreases with an increase in the coefficient of variation of soil modulus and bulk density of the fill and increases with increase in correlation coefficient between the variables. It is possible to obtain a central factor of safety (CFS) value on the basis of the target reliability and variations in the design parameters. The use of reliability-based considerations is illustrated with two typical simple cases of buried pipe installations.Key words: reliability measures, buried flexible pipes, deflection (ovalization), buckling, variability, safety.
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MacFarlane, C. J. "Flexible riser pipes: problems and unknowns." Engineering Structures 11, no. 4 (October 1989): 281–89. http://dx.doi.org/10.1016/0141-0296(89)90047-3.

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Jiao, Guoyang. "Limit state design for flexible pipes." Marine Structures 5, no. 5 (January 1992): 431–54. http://dx.doi.org/10.1016/0951-8339(92)90012-e.

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Dissertations / Theses on the topic "Flexible Pipes"

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Nygård, David. "Tensile armour buckling in flexible pipes." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18652.

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The exible pipelines has been widely used by the oil and gas industry the lastdecades and this trend is expected to continue as the operating depths are increasedfurther. For deep water applications the radial and lateral buckling modes can becritical. Many studies has been carried out using nite element models to studythese failure modes.In this thesis a nite element model is created with the aim to recreate resultsobtained in a recently published article by Vaz and Rizzo. The model is built upusing pipe, beam, contact and spring elements to represent the complex behaviourof the cross section. The loading is carried out by rst applying the dry mass, thenthe external pressure and nally end compression.When comparing buckling loads generated in this thesis by the ones in thearticle by Vaz and Rizzo the observation made is that the buckling loads from thisthesis are signicantly higher. When comparing only the inclination of the endshortening versus buckling load curves it was seen that the curves from article hada only slightly larger inclination than the results from the analyses in this thesis.This indicates that there is a small dierence in the stiness used. By modifyingthe stiness it should be possible to get the same inclination of the curve.Analyses were also carried out on how the slip distance aects the bucklingloads. By increasing the slip distance by 50% and 100% it was observed thatthe buckling loads were reduced drastically. In the article by Vaz and Rizzo noinformation is given on the slip distance. By tuning the slip distance and stinessof the springs it should therefore by possible to obtain the exact same results as inthe article. This clearly illustrates the importance of stating all assumptions andinput parameters when describing models used for analysis.
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Reginold, Jesuthasan Terence. "Rocker pipe solution to alleviate settlement induced distress in flexible pipes." Thesis, University of East London, 2006. http://roar.uel.ac.uk/1257/.

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A number of earlier researchers investigated the soil structure interaction parameters which affect the structural behaviour of buried flexible pipes. However, it was not until the mid-1990s that the importance of rocker pipe design to accommodate differential settlement raised awareness of the consequent absence in current design procedure [BS EN 1295-3; 1998]. This study widens the understanding of the effect of differential ground movements on the behaviour of flexible pipes to address concerns raised to the Committee European de Normalisation. Many pipeline failures result from the excessive strains developed in the vicinity of the junction between a pipe and a settling structure. Case studies of such failures are presented in this thesis, which demonstrates that it can occur not only in large diameter pipeline but also in small diameter domestic pipeline systems. A method of analysis and the use of developed appropriate rocker pipe length is an industrially useful outcome of this research. Analytical solutions for flexible pipes have been developed based on the concept of beams on elastic foundation approach. Non-dimensional relationships have been developed and are presented in the form of charts. These charts permit hand calculations and rapid verification of structural design of the pipeline and, thus, assess the integrity of the existing pipelines located in areas with ground instability. Knowledge of the soil strength and sub-grade modulus is required, along with pipeline geometry and pipe stiffness, to apply the non-dimensional relationships. The soil parameters can be measured in situ or estimated using empirical correlations. The cause for failure has been investigated with the proposed analytical soil structure interaction approach which identifies the zone of distress in the pipeline. The analysis has been extended to demonstrate how a rocker pipe system can be incorporated to alleviate such distress. The concept of rocker pipes has also been investigated in the study through laboratory scale testing. Soil box tests, with ground conditions defined through plate/pipe load testing, have been developed. Full-scale testing on flexible pipes instrumented with FlexiForce pressure sensors at the pipe invert, strain gauges measuring strain due to induced differential settlement on the pipe crown and deflection transducers measuring deflection profiles along the pipe length due to differential settlement of the end structure, have been used to validate the mathematical modelling. Ile combination of rocker pipes with flexible joints and elastic effects removes the distress imposed by the differential settlement, and provides the possibility for a better comparison with the data obtained from both theoretical analysis and experimental tests. Results from each of these approaches are compared with those from experiments. It is concluded that there is need for a rational design procedure analysis for rocker pipes to be incorporated into codes of practice, such as EN 1295.
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Sævik, Svein. "On stresses and fatigue in flexible pipes." Norway : Dept. of Marine Structures, the University of Trondheim, 1992. http://catalog.hathitrust.org/api/volumes/oclc/27348152.html.

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Warnakulasuriya, Hapuhennedige Surangith. "Soil structure interaction of buried pipes." Thesis, University of East London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286607.

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Baradaran-Seyed, Farman. "On the dynamics of flexible risers and suspended pipes." Thesis, University College London (University of London), 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.722589.

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Liu, Xueying. "Dynamic Response of Flexible Pipes Considering Different Damping Models." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26253.

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Flexible pipe is a layered structure composed of plastic and steel materials. Under a large bending moment, the pipe layers may slide relative to each other due to internal friction. The moment curvature relationship for the flexible pipe is a tri-linear curve. Under cyclic bending moment, a hysteresis loop will be formed in the moment curvature curve. The area of the loop is the energy loss due to the internal friction. This thesis is aimed to study the effects of hysteresis damping on the global analysis of the flexible riser. To begin with, a review on the flexible pipe technology and nonlinear finite element method is performed. Then a local analysis is carried out in BFLEX to obtain the cross sectional characteristics. Then the global analysis is conducted to study the responses of the flexible riser in terms of the curvature, moment and axial force. From the study, slip behavior only occurs at the hang off part of the riser. For the rest part, pipe layers stay in the stick regime, meaning there is no energy loss due to the internal friction. Therefore for the global analysis of the flexible riser, there is no need to further study the equivalent linear damping models. In addition, the influence of linear and nonlinear bending models on the global response of the riser is investigated. It is found that the current standard industrial practice, namely applying the linear bending model with the full slip bending stiffness, gives an over conservative response prediction. It is therefore recommended to use the physically correct nonlinear moment curvature relationship for the global analysis of flexible riser.
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Chen, Zhenxin. "The mechanical behaviour and fatigue analysis of flexible pipes." Thesis, Heriot-Watt University, 1990. http://hdl.handle.net/10399/1292.

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Champneys, Alan R. "The nonlinear dynamics of articulated pipes conveying fluid." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302850.

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Kennedy, I. "Vibration transmissibility characteristics of fibre and steel reinforced flexible pipes." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378334.

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Tan, Zhimin. "On the mechanics of flexible pipes, umbilicals and marine cables." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338079.

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Books on the topic "Flexible Pipes"

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R, Whidden William, and American Society of Civil Engineers. Task Committee on Buried Flexible (Steel) Pipe Load Stability Criteria & Design., eds. Buried flexible steel pipe: Design and structural analysis. Reston, Va: American Society of Civil Engineers, 2009.

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National Conference on Flexible Pipes. (1st 1990 Columbus, Ohio). Structural performance of flexible pipes: Proceedings of the First National Conference on Flexible pipes, Columbus, Ohio, 21-23 October, 1990. Rotterdam: A.A. Balkema, 1990.

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European Conference on Flexible Pipes, Umbilicals, Marine Cables (1st 1992 London, England). Proceedings of the First European Conference on Flexible Pipes, Umbilicals, Marine Cables. London: Bentham Press, 1992.

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Crabb, G. I. Loading tests on buried flexible pipes to validate a new design model. Crowthorne: Transport and Road Research Laboratory, 1985.

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Crabb, G. I. Loading tests on buried flexible pipes to validate a new design model. Crowthorne,Berks: Transport and Road Research Laboratory, Highways and Structures Dept., Ground Engineering Division, 1985.

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European Conference on Flexible Pipes, Umbilicals and Marine Cables (3rd 1999 London, England). Proceedings of the Third European Conference on Flexible Pipes, Umbilicals and Marine Cables-Materials Utilisation for Cyclic and Thermal Loading. London: Bentham, 1999.

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Travis, L. E. Flex-Seal Ltd: Pipe couplings. Durham: Durham University Business School, 1999.

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Structural Performance Flexible Pipes. Routledge, 1990.

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Bai, Yong, Qiang Bai, and Weidong Ruan. Flexible Pipes: Advances in Pipes and Pipelines. Wiley & Sons, Incorporated, John, 2017.

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Bai, Yong, Qiang Bai, and Weidong Ruan. Flexible Pipes: Advances in Pipes and Pipelines. Wiley & Sons, Incorporated, John, 2017.

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Book chapters on the topic "Flexible Pipes"

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Damak, Othman, and Ezzedine Hadj-Taïeb. "Waterhammer in Flexible Pipes." In Lecture Notes in Mechanical Engineering, 373–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37143-1_45.

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Zhang, Yu, and Jianhang Xin. "Flexible Pipes and Umbilicals." In Encyclopedia of Ocean Engineering, 1–15. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-10-6963-5_274-1.

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Zhang, Yu, and Jianhang Xin. "Flexible Pipes and Umbilicals." In Encyclopedia of Ocean Engineering, 561–75. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-10-6946-8_274.

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Terpstra, Marten, and Johan G. Van Veen. "Heat Pipes Having Deviating Configurations; Flexible Heat Pipes." In Heat Pipes: Construction and Application, 53–69. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3447-4_3.

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Watkins, Reynold K. "The Story of Buried Steel Pipes and Tanks." In Buried Flexible Steel Pipe, 161–76. Reston, VA: American Society of Civil Engineers, 2009. http://dx.doi.org/10.1061/9780784410585.ape.

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Dave, Margi, and Chandresh Solanki. "Numerical Analysis of Flexible Pipes Buried in Cohesionless Soil." In Lecture Notes in Civil Engineering, 479–89. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6466-0_44.

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Khrustalev, Dmitry. "Cryogenic Loop Heat Pipes as Flexible Thermal Links for Cryocoolers." In Cryocoolers 12, 709–16. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/0-306-47919-2_93.

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Ashcombe, G. T., and R. C. Kenison. "The Problems Associated with NDT of High Pressure Flexible Pipes." In Advances in Subsea Pipeline Engineering and Technology, 179–204. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0617-4_8.

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Løtveit, S. A., P. Bryn, and B. K. Hjermann. "Upheaval Buckling of Flexible Pipes Method Selected at the Troll Olje Field." In Advances in Underwater Technology, Ocean Science and Offshore Engineering, 77–110. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1178-2_5.

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Zhang, Zhiying. "Evaluation of Environmentally Assisted Cracking of Armour Wires in Flexible Pipes, Power Cables and Umbilicals." In Energy Materials 2014, 775–80. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48765-6_95.

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Conference papers on the topic "Flexible Pipes"

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Hansen, Rasmus, Anders Lyckegaard, Christian Cappeln, Dag Mcgeorge, Nils Sødahl, and Erik Bendiksen. "Carcass Tearing in Flexible Pipes." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41554.

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This paper presents a novel model of carcass tearing in flexible pipes. The model is based on a simple parameterization of the pipe design in terms of isotropic layers, together forming the composite pipe structure. The model allows evaluations of interfacial shear stresses between the inner pipe layers, as well as axial normal stress and strain levels in response to gravitational and thermal loading. Interfacial slip of a given interface, i.e. axial sliding of adjacent layers relative to each other, is accounted for by introducing a maximal possible value of the interfacial shear stress for a given interface, amounting to a static friction capacity. The model shows how a cut-off of the shear stress at the shear stress capacity implies an interfacial slip, which is followed by a significant increase in axial strain of the carcass layer. Detailed quantitative results of the model are presented for a particular 11.5 inch K-carcass riser design. In order to improve engineering practice, an analytical expression of the governing shear stress is derived in terms of the gravitational and thermal loads. This analytical expression is easily applied for particular design evaluations. The model directs attention to critical design parameters related to the carcass tearing failure mode and thereby supports continued safety in the design and operation of flexible pipes from a carcass tearing perspective.
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Felix-Henry, Antoine, and Philippe Lembeye. "Flexible Pipes In-Service Monitoring." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51348.

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Offshore flexible pipelines are designed to operate without intervention throughout the life of field, which can be 20 to 30 years long. The monitoring of these lines is more and more often considered and implemented with two main objectives: to confirm that the risers and flowlines operate within safe working limits and enable the assessment of the integrity and lifetime of these lines. The first objective can be achieved by continuous collection of the operational data, such as for example internal pressure, fluid temperature, riser top tension and vessel motions, to confirm that the pipelines continue to be operated within the design parameters. The second objective can be achieved through direct condition monitoring of the flexible pipe (for example coupons samples, temperature within the pipe structure, curvature and bending stresses). All of these techniques can contribute towards regular assessment of pipe integrity and lifetime. Flexi France is developing several monitoring and inspection technologies, some of which are already operational or ready to use. This paper will focus primarily on corrosion monitoring of flexible risers steel reinforcement layers through measurement of the annular space fluid composition and physical parameters such as temperature distribution, end-termination sealing integrity and dynamic risers curvature distribution. The state of the art monitoring technologies will be presented in this paper, and it will be explained how they can allow the field operator to optimize the inspection program, reduce the risk of potential damage in operation or enable reuse of the flexible lines at the end of field life.
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SHAUBACH, R., and N. GERNERT. "High performance flexible heat pipes." In 20th Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-1085.

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Gay Neto, Alfredo, Clo´vis de Arruda Martins, Celso Pupo Pesce, Christiano Odir C. Meirelles, Eduardo Ribeiro Malta, Teo´filo F. Barbosa Neto, and Carlos Alberto F. Godinho. "Burst Prediction of Flexible Pipes." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20414.

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Usually, when a large internal fluid pressure acts on the inner walls of flexible pipes, the carcass layer is not loaded as the first internal pressure resistance is given by the internal polymeric layer. The internal polymeric layer transmits almost all that loading to the metallic pressure resistant layer, or pressure armor layer. This layer must then be designed to ensure that the flexible pipe will not fail when loaded by a defined value of internal pressure. The present paper presents three different numerical models and one simple analytical model for determining the maximum internal pressure loading for a flexible pipe. The aim is to avoid pipe burst. The first numerical model is a ring approximation for the helically rolled pressure layer, considering its cross section as built. A second one is a full model for the same structure, considering the pressure layer laying angle and the cross section as built. The third numerical model is a 2D simplified version, considering the pressure layer as an equivalent ring. The first two numerical models consider contact nonlinearities and a nonlinear elastic-plastic material model for the pressure layer. The failure event and the corresponding stress state are discussed. Assumptions for each model are compared and discussed, with comparative results.
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Eide, Jorgen Thomas Wold, and Jan Muren. "Lifetime Assessment of Flexible Pipes." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24153.

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This paper presents a methodology for performing a lifetime assessment of flexible pipes applicable to re-qualification during the original design life and at life extension. A systematic approach is developed, providing flexible riser and flowline engineers a standardized methodology for determining the current integrity- and risk level. The objective is to provide methodology that is easy to implement, thus enabling consistent assessments of all flexible pipes in the operator’s portfolio. The methods described are taken from work performed in a recent JIP run jointly by MARINTEK/NTNU and 4Subsea, and is based on substantial experiences with lifetime assessment combined with a review of relevant guidelines and standards. Key areas are suggested for industry improvement and recommendations to further developments, to increase both efficiency and quality of the lifetime assessment process.
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Cao Bayout, Lucile, François Migeon, and Florian Sarrasin. "Assessment of New Materials in Unbonded Flexible Pipes." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31811-ms.

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Abstract The present paper is related to the assessment of new materials for use in unbonded flexibles pipes designed and manufactured as per API 17J. Unbonded flexible pipes are a key solution in the oil and gas industry and are used as subsea static flowlines and dynamic risers to convey various types of fluids at high pressure, high temperature and in deep-water environment. In view of the increasingly challenging applications it shall withstand, the unbonded flexible pipe is complex in terms of design, fabrication and installation aspects and leads to a generally tailor-made design. Consequently, it drives flexible pipe manufacturers to constantly develop, optimize and qualify new solutions, including new materials for the different layers and components of the flexible pipe. This paper focuses on the process followed for the incorporation of new materials in the flexible pipe TAC (Type Approval Certificate) upon verification of conformity versus API 17J. Firstly, development / assessment of a new material, or an existing material in a new environment, is generally made with the help of methods to qualify a new technology, through functional analysis and Qualification-FMECA (Q-FMECA), allowing to establish the qualification program. In a second part, API 17J requirements to qualify a new material are outlined, including procurement, manufacturing process, quality assurance, small scale, medium and full-scale tests and design rules aspects. Involvement of the IVA and IVA deliverables will be finally described.
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Cao Bayout, Lucile, François Migeon, and Florian Sarrasin. "Assessment of New Materials in Unbonded Flexible Pipes." In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/31811-ms.

Full text
Abstract:
Abstract The present paper is related to the assessment of new materials for use in unbonded flexibles pipes designed and manufactured as per API 17J. Unbonded flexible pipes are a key solution in the oil and gas industry and are used as subsea static flowlines and dynamic risers to convey various types of fluids at high pressure, high temperature and in deep-water environment. In view of the increasingly challenging applications it shall withstand, the unbonded flexible pipe is complex in terms of design, fabrication and installation aspects and leads to a generally tailor-made design. Consequently, it drives flexible pipe manufacturers to constantly develop, optimize and qualify new solutions, including new materials for the different layers and components of the flexible pipe. This paper focuses on the process followed for the incorporation of new materials in the flexible pipe TAC (Type Approval Certificate) upon verification of conformity versus API 17J. Firstly, development / assessment of a new material, or an existing material in a new environment, is generally made with the help of methods to qualify a new technology, through functional analysis and Qualification-FMECA (Q-FMECA), allowing to establish the qualification program. In a second part, API 17J requirements to qualify a new material are outlined, including procurement, manufacturing process, quality assurance, small scale, medium and full-scale tests and design rules aspects. Involvement of the IVA and IVA deliverables will be finally described.
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Ulveseter, Jan V., and Svein Sævik. "In-Line Vibrations of Flexible Pipes." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61325.

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A semi-empirical prediction tool for pure in-line vortex-induced vibrations is under development. The long-term goal is to be able to realistically model the dynamic behavior of free spanning pipelines exposed to arbitrary time dependent external flows at low velocities. Most VIV programs operate in frequency domain, where only steady currents and linear structural models can be simulated. In contrast, the proposed model predicts hydrodynamic forces as function of time, enabling a time integration scheme to solve the equation of motion. Non-linear time domain simulations allow for modelling of excitation from non-steady currents. In addition, non-linear effects such as soil-pipe interaction, varying tension, and response dependent material, stiffness and damping properties may be included in the analysis, when combining the hydrodynamic force model with a structural non-linear finite element model. Hydrodynamically, the proposed prediction tool consists of the general Morison equation plus two vortex shedding forcing terms. The latter two are able to synchronize with the structural motion for a given frequency band, to induce vibrations in lock-in regimes. In this paper, the proposed pure in-line VIV model is compared to the frequency domain model VIVANA and DNV Recommended Practice, simulating experiments with a model-scale flexible pipe exposed to current velocities at which cross-flow vibrations have not yet developed. A few experimental data points are included in verifying the performance of the newly developed time domain model. The effect of changing empirical coefficients in the vortex shedding forcing terms, and allowing only one of the terms to excite structural vibrations during a simulation, is numerically investigated. A goal is to obtain increased understanding of how the proposed time domain model performs when simulating VIV of a flexible pipe, which is more complex than that of an elastically mounted rigid cylinder since several natural frequencies and corresponding modes might be excited.
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Lo̸tveit, Svein Are, Trond Eklund, Gudmund Per Olsen, and Anne Pollestad. "Flow Induced Vibrations in Flexible Pipes." In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37194.

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Flexible pipes for large volume gas export and gas injection have been installed on several platforms offshore Europe. In some of these applications high frequency vibrations have been reported. Onset of the vibrations is related to flow rate. The vibration frequency is typically above 150Hz and structures with stresses above the fatigue limit will rapidly fail in fatigue. This paper covers the following: • Results from a measurement program performed at the Norsk Hydro Troll C platform. • Theoretical studies related to gas flow in flexible pipes. • Actions taken to control the flow induced vibrations at Troll C.
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Haslum, K., and A. Gjelsvik. "Multipass Swivels Based on Flexible Pipes." In Offshore Technology Conference. Offshore Technology Conference, 1989. http://dx.doi.org/10.4043/6167-ms.

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Reports on the topic "Flexible Pipes"

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Driver, W. B. Assist in development of flexible drill pipe. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/5118159.

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Thienel, Lee, Michael R. Lewis, Patrick J. Brennan, Matt Buchko, and Dave Glaister. Design and Performance of the Cryogenic Flexible Diode Heat Pipe (CRYOFD) Flight Experiment. Fort Belvoir, VA: Defense Technical Information Center, October 1998. http://dx.doi.org/10.21236/ada373637.

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Ebeling, Robert M., Ralph W. Strom, Barry C. White, and Kevin Abraham. Simplified Analysis Procedures for Flexible Approach Wall Systems Founded on Groups of Piles and Subjected to Barge Train Impact. Fort Belvoir, VA: Defense Technical Information Center, September 2012. http://dx.doi.org/10.21236/ada570346.

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