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Journal articles on the topic 'Flexible pipe'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Ratnaraju, Rajkumar. "Experimental investigation of buried flexible HDPE pipe." Gradjevinski materijali i konstrukcije, no. 00 (2024): 14. http://dx.doi.org/10.5937/grmk2300016r.

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Buried pipes are used mainly for water supply and drainage, among many other applications such as oil, liquefied natural gas, coal slurries, and mine tailings. The pipes used may be rigid (reinforced concrete, vitrified clay, and ductile iron) or flexible (steel, UPVC, aluminum, fiberglass, and high-density polyethylene), although the distinction between them is blurring. Deflection or buckling determines the design of flexible pipes. HDPE pipes are preferred due to their light weight, long term chemical stability and cost efficiency. This project aims to design and fabricate an experimental s

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2

Ghobarah, A., and W. K. Tso. "Behaviour of buried small flexible pipes." Canadian Journal of Civil Engineering 15, no. 3 (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 r

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3

Wu, Yan, Yu Li, Xinjun Gu, Ziyan Wen, Zhian Deng, and Kai Yi. "Experimental Study on Wettability of Xinjiang Oilfield Crude Oil on Two Kinds of Non-Metallic Pipes." ITM Web of Conferences 26 (2019): 03009. http://dx.doi.org/10.1051/itmconf/20192603009.

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In recent years, non-metallic pipes have been widely used in oilfield development due to their excellent corrosion resistance. In this paper, the wettability of flexible composite pipe and plastic alloy pipe surface was studied for some crude oil in Xinjiang oilfield. The wettability of the surface of the flexible composite pipe and the surface of the plastic alloy pipe and its influence on the flow resistance were discussed, and the wettability of the crude oil on the metal surface was compared. This experimental study has certain guiding significance for the judgment of pressure drop of crud

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4

Peng, Chu Chu, Ze Liang Xu, and Zhi Wen Zhu. "A Kind of Joint Structure of Rigid Pipe and Flexible Pipe in Seabed." Applied Mechanics and Materials 80-81 (July 2011): 792–96. http://dx.doi.org/10.4028/www.scientific.net/amm.80-81.792.

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In this paper, a kind of joint structure which can connect rigid pipe with flexible pipe in seabed longtime was designed and its characteristics were analyzed. The structure can be immune to seawater’s fluctuation or erosion, where the stress concentration at the joint of rigid pipe and flexible pipe was reduced to ensure pipes safe. The joint structure has low cost and highly reliability, which was helpful to exploitation in deep sea.

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5

Botto, Adriana, Céline Banti, and Enda O'Sullivan. "Unbonded flexible pipe integrity management, reuse and life extension." APPEA Journal 48, no. 1 (2008): 319. http://dx.doi.org/10.1071/aj07021.

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Australia has a long tradition of innovation in the use of floating production systems in the past 20 years. The classical solution adopts unbonded flexible pipe, a key technology, to enable floating facilities to produce in relatively shallow waters. While unbonded flexible pipe is a reliable technology that has been in use for approximately 30 years, damage, and ultimately failure can occur during its early (i.e. during manufacturing/testing, installation and early operation) and later life. Accurate assessments of the historical records of flexible pipe usage have led to an increased unders

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6

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 (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

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7

Cao, Runqing, Zilong Guo, Wei Chen, Huliang Dai, and Lin Wang. "Nonlinear dynamics of a circular curved cantilevered pipe conveying pulsating fluid based on the geometrically exact model." Applied Mathematics and Mechanics 45, no. 2 (2024): 261–76. http://dx.doi.org/10.1007/s10483-024-3084-7.

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AbstractDue to the novel applications of flexible pipes conveying fluid in the field of soft robotics and biomedicine, the investigations on the mechanical responses of the pipes have attracted considerable attention. The fluid-structure interaction (FSI) between the pipe with a curved shape and the time-varying internal fluid flow brings a great challenge to the revelation of the dynamical behaviors of flexible pipes, especially when the pipe is highly flexible and usually undergoes large deformations. In this work, the geometrically exact model (GEM) for a curved cantilevered pipe conveying

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8

Xu, Guo-min, and Chang-geng Shuai. "Burst pressure prediction of fiber-reinforced flexible pipes with arbitrary generatrix." Journal of Engineered Fibers and Fabrics 16 (January 2021): 155892502199081. http://dx.doi.org/10.1177/1558925021990812.

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Fiber-reinforced flexible pipes are widely used to transport the fluid at locations requiring flexible connection in pipeline systems. It is important to predict the burst pressure to guarantee the reliability of the flexible pipes. Based on the composite shell theory and the transfer-matrix method, the burst pressure of flexible pipes with arbitrary generatrix under internal pressure is investigated. Firstly, a novel method is proposed to simplify the theoretical derivation of the transfer matrix by solving symbolic linear equations. The method is accurate and much faster than the manual deri

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9

Park, Joon-Seok, Sun-Hee Kim, and Eung-Ho Kim. "Pipe Stiffness Prediction of Buried Flexible Pipes." Journal of Korean Society of Water and Wastewater 26, no. 1 (2012): 13–20. http://dx.doi.org/10.11001/jksww.2012.26.1.013.

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10

Mustaffa, Zahiraniza Bt, and Thar M. Badri Albarody. "Flexible Thermosetting Pipe." Advanced Materials Research 983 (June 2014): 444–49. http://dx.doi.org/10.4028/www.scientific.net/amr.983.444.

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The typified as flexible thermosetting pipe, is a new product, developed initially in response to the need for a non-metallic replacement for steel pipe used for oil and gas productions. This product may use for high pressure down-hole applications in which the pipe could repeatedly transported onto a drum. The proposed pipe comprise an internal thermoplastic layer play as liner and a fluid-tight cover, and one or more dual-helical wounding tape stacks applied to the internal liner for absorbing axial and bending loads. The tape stacks are wrapped helically onto the pipe structure with adjacen

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11

A., Bahr M., Tarek M. F., Hassan A, A., and Hassaan D. M. "Experimental Simulation for Load Reduction Techniques on Underground Utilities using Geofoam." Academic Research Community publication 2, no. 4 (2019): 372. http://dx.doi.org/10.21625/archive.v2i4.375.

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This paper investigates an experimental study on reducing stress acting on buried flexible pipes by using expanded polystyrene (EPS) geofoam techniques. An experimental model was carried out with dimensions depending on pipe diameter (D) and location, the used fill cover material was from sand and EPS blocks either embankment form, or within sand backfill as embedded layer. The pipe flexible is un-plasticized polyvinyl chloride (UPVC). A series of experiments have been carried out by using static surface loading on rectangular steel plate,where the load is distributed over the backfill. The be

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12

Sun, Zhenwen, Weiping Huang, Hailong Lu, et al. "Mechanical Characteristics of Fiber-Reinforced Flexible Pipe Subjected to Axial Tensile Load." Journal of Marine Science and Engineering 11, no. 3 (2023): 586. http://dx.doi.org/10.3390/jmse11030586.

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Fiber-reinforced flexible pipes are subjected to large axial tension loads in deep-water applications, which may result in the excessive deformation of the pipes. Owing to the anisotropy of the composite materials, accurately describing the tensile behavior of these pipes is difficult. Theoretical, numerical, and experimental methods are employed in this study to investigate the mechanical characteristics of a glass fiber-reinforced unbonded flexible pipe under axial tensile loads. Based on the load–strain relationship of each pipe layer, analytical equations considering the effect of anisotro

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13

Wang, Hualin, Zhixun Yang, Jun Yan, et al. "Prediction Method and Validation Study of Tensile Performance of Reinforced Armor Layer in Marine Flexible Pipe/Cables." Journal of Marine Science and Engineering 10, no. 5 (2022): 642. http://dx.doi.org/10.3390/jmse10050642.

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Marine flexible pipe/cables, such as umbilicals, flexible pipes and cryogenic hoses, are widely adopted in ocean engineering. The reinforcing armor layer in these pipe/cables is the main component for bearing loads, which is a typical multi-layer helically wound slender structure with different winding angles for different devices. There has been no general theoretical methodology to describe the tensile performance of these flexible pipe/cables. This paper first introduces a theory to solve the tensile mechanical behavior of a helically wound structure. Based on the curved beam theory, a solu

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14

An, C., C. W. Gu, H. Qin, T. T. Li, and M. L. Duan. "An Analysis of Carcass Layer Erosion in Un-Bonded Flexible Offshore Pipework." International Journal of Maritime Engineering 163, A1 (2021): 63–77. http://dx.doi.org/10.5750/ijme.v163ia1.6.

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In this paper, a simplified model for erosion in un-bonded flexible pipes caused by the sand entrained in the produced fluid is established. Flow field analysis is performed based on the governing equations of the continuous fluid and the discrete particles. A two-way coupled Eulerian-Lagrangian approach is employed to solve the gas-solid flow in the pipe bend. To eliminate the influence of the length of the straight pipe section on the stability of the flow field in the pipe, the flow field distribution under different lengths is analyzed to determine the optimal straight pipe length. Six com

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15

Wang, Wei, Lei Sun, and Yang Liu. "Properties of Unbonded Flexible Pipe under Axial Force." Applied Mechanics and Materials 651-653 (September 2014): 1004–8. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.1004.

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Flexible pipes, which can be divided into bonded and unbonded types, have been used for years in the oil industry. An unbonded structure presents a large interest in offshore production as they allow to realize simple liaison between the seafloor and the surface. In the present paper, an unbonded flexible pipe under axial force has been analyzed by finite element (FE) method in which eight layers of the unbonded flexible pipe have established. Solid and shell elements are used to simulate the layers. In the FE model, all layers are modeled separately with contact and friction interfaces betwee

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16

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 p

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17

Fattah, Mohammed Yousif, Waqed Hammed Hassan, and Sajjad Emad Rasheed. "Behavior of Flexible Buried Pipes Under Geocell Reinforced Subbase Subjected to Repeated Loading." International Journal of Geotechnical Earthquake Engineering 9, no. 1 (2018): 22–41. http://dx.doi.org/10.4018/ijgee.2018010102.

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The present article constitutes an experimental investigation of the behavior of buried PVC pipes. A number of laboratory experiments were conducted using PVC pipes which were buried in a medium sand layer, below a subbase layer, reinforced with geocells. They were subject to repeated dynamic load amplitudes of 0.5 and 1 ton and loading frequencies of 0.5, 1 and 2 Hz, to study the effects of the geocell reinforcement layer, in terms of the amount of stress reaching the pipe crown and the vibration of the pipe. A 3D numerical model was also developed to investigate the performance of the geocel

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18

YAKUBOVSKAYA, S. V., N. I. KRASOVSKAYA, and N. Y. SILNITSKAIA. "SIMULATION OF THE STRESS-STRAIN STATE FOR LONG-LENGTH FLEXIBLE PIPES." Periódico Tchê Química 15, no. 30 (2018): 670–77. http://dx.doi.org/10.52571/ptq.v15.n30.2018.674_periodico30_pgs_670_677.pdf.

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An algorithm for calculating the stress-strain state for a system of long-length flexible pipes on a drum is proposed. The material which the pipe is made of operates in the area of plastic deformation due to the relative small drum diameter. To take into account the nonlinear properties of the construction material, the concept of a variable (secant) module is used. The algorithm for calculating the stress-strain state of a flexible reinforced long-length pipe was compiled on the basis of the iteration method in terms of the magnitude of the change in the secant modulus. A block diagram is gi

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19

Lee, Young-Geun, Sun-Hee Kim, Joon-Seok Park, and Soon-Jong Yoon. "Pipe Stiffness Prediction of GRP Flexible Pipe." Journal of the Korean Society for Advanced Composite Structures 2, no. 3 (2011): 18–24. http://dx.doi.org/10.11004/kosacs.2011.2.3.018.

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20

Liu, Wei, Yu Li, Yan Wu, et al. "Experimental Study on the Peeling Characteristics of Wax on the Surface of Flexible Composite Pipe and Plastic Alloy Tube." ITM Web of Conferences 26 (2019): 03007. http://dx.doi.org/10.1051/itmconf/20192603007.

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In this paper, the wax deposition stripping experiment on the surface of flexible composite tube and the surface of plastic alloy tube was carried out by using medical paraffin. Under different temperature and different thickness of wax, the peeling force of wax on the surface of flexible composite pipe and the surface of plastic alloy pipe lining was discussed. The experimental conclusions of this study are specific guidance for wax cleaning technology in nonmetallic pipes and device design.

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21

Sade, Juswan. "Literature Study Of The Effectiveness Of Flexible Pads As Submarine Pipeline Protection Due To Anchor Falls." Collaborate Engineering Daily Book Series 1, no. 2 (2023): 1–9. http://dx.doi.org/10.62012/collaborate.v1i2.32.

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Subsea pipelines are critical transportation infrastructure for the offshore oil and gas industry. With the increasing construction of undersea pipeline networks and the construction of ports on coastlines, cases often occur where the landing sections of undersea pipelines intersect shipping lanes. Some of the problems faced in underwater pipes include damage to underwater pipes due to shifting and kinking, pipes hitting ship anchors, and pipes being dragged by ship anchors so that they are damaged and broken. Subsea pipelines located in shipping areas or near docks are vulnerable to the effec

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22

Gu, Fan, Gan Song, Qiao Jin, and Hui Xin Wang. "Study on Optimal Winding Angle of Submarine Oil Flexible Pipe." Advanced Materials Research 602-604 (December 2012): 2223–26. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.2223.

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According to the actual structure, using the finite element software ANSYS, numerical model of submarine oil flexible pipe was established. For the mechanical response of flexible pipe under the combined effect of internal pressure load and transverse load, the comparison on the result by numerical calculation and static loading test shows that the numerical model of flexible pipe is rational. Moreover, based on the numerical model of flexible pipe, this paper indicates that the maximum Mises stress occurs at the end of flexible pipe, which would lead to the bulge performance failure. Furtherm

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23

Han, Yan. "Study on the Submarine Pipeline with Flexible Spoilers." Key Engineering Materials 501 (January 2012): 431–35. http://dx.doi.org/10.4028/www.scientific.net/kem.501.431.

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Two new methods which use flexible spoilers to protect submarine pipelines are proposed. One is put flexible spoiler on the top of the pipe to make pipe self-buried. The other is put flexible spoiler under the pipe to stop the erosion under the pipe. Through physical experiments, the pressure distribution and scour hole around the submarine pipeline with flexible deflectors were studied. Experiment results point out that top flexible spoiler can increase the resistance of the pipe, increase the scour hole depth, accordingly make the pipeline be self-buried. The flexible spoiler under the pipe

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24

Ti, Zhongsen, Fuzhi Wang, Yahong Zhao, Baosong Ma, Cong Zeng, and Baoyong Liao. "Theoretical Study on Design of Composite Lining Structure with Rigid–Flexible Combination for Trenchless Pipeline Rehabilitation." Applied Sciences 12, no. 11 (2022): 5374. http://dx.doi.org/10.3390/app12115374.

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Trenchless rehabilitation lining can be divided into flexible solid wall lining structures, rigid lining structures and rigid–flexible composite lining structures. This paper reviews the research status of the design theory of trenchless rehabilitation lining pipes, analyzes the theory of rigid–flexible composite lining structures, and points out that the value of the factor determined from non-grouting angle K1 is not clear in the design formula of the rigid–flexible composite lining structure mentioned in the ASTM ‘Standard Practice for Installation of Machine Spiral Wound Poly (Vinyl Chlori

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25

Szarf, Krzysztof, Gael Combe, and Pascal Villard. "Particle Shape Effect on Macroscopic Behaviour of Underground Structures: Numerical and Experimental Study." Studia Geotechnica et Mechanica 36, no. 3 (2015): 67–74. http://dx.doi.org/10.2478/sgem-2014-0028.

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Abstract The mechanical performance of underground flexible structures such as buried pipes or culverts made of plastics depend not only on the properties of the structure, but also on the material surrounding it. Flexible drains can deflect by 30% with the joints staying tight, or even invert. Large deformations of the structure are difficult to model in the framework of Finite Element Method, but straightforward in Discrete Element Methods. Moreover, Discrete Element approach is able to provide information about the grain-grain and grain-structure interactions at the microscale. This paper p

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26

You, Jingyue, Yinglong Zhao, and Ben Zhang. "The Effect of In-Pipe Fluid States and Types on Axial Stiffness Characteristics of Fiber-Reinforced Flexible Pipes." Journal of Marine Science and Engineering 13, no. 6 (2025): 1069. https://doi.org/10.3390/jmse13061069.

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As critical components in marine engineering fluid transmission systems, fiber-reinforced flexible (FRF) pipes have static mechanical properties that depend on internal fluid pressure. Current analytical approaches predominantly employ uniformly distributed load (UDL) assumptions to simulate unidirectional fluid pressure effects on pipe surfaces. However, existing methodologies neglect fluid–pipe structure coupling effects. This study investigates the rubber-based FRF pipe by establishing a numerical model incorporating fluid–structure interaction effects and material nonlinearity, aiming to e

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27

Zhu, Xiuxing, Yingpeng Xu, Chenyang Mao, et al. "Research on Multi-Body Collision Dynamics of Ball Cage Flexible Drill Pipe Considering Borehole Curvature." Machines 11, no. 3 (2023): 357. http://dx.doi.org/10.3390/machines11030357.

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A ball cage flexible drill pipe is a new type of ultra-short-radius drilling tool, which consists of multiple flexible joints hinged together. During the drilling process, the flexible members will come into contact and wear, which reduces the efficiency of load transfer. The multi-body collision contact dynamics model was proposed to study the performance of the ball cage flexible drill pipe. The method considered the influence of the borehole curvature. The kinematic equations of the ball cage flexible drill pipe were established. The Lankarani–Nikravesh collisional contact model was used to

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28

Gao, Mantong, Miaomiao Zhao, Linyun Xian, et al. "Effect of damage to the outer protective layer on the pressure resistance of flexible composite pipes." Journal of Physics: Conference Series 2956, no. 1 (2025): 012009. https://doi.org/10.1088/1742-6596/2956/1/012009.

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Abstract The outer protective layer of flexible composite pipe is susceptible to external drag, ground friction, collision, shoveling and so on, which leads to breakage and cracking during field construction and use, thus affecting the pressure resistance performance of the pipe. In this work, DN50mm PN6.4MPa flexible composite pipe for oil transmission and DN70mm PN25MPa flexible composite pipe for water transmission provided by an oilfield oil extraction plant are taken as the research object, and the design of damage to the outer protective layer and the 200h hydrostatic pressure test are c

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29

Gu, Fan, Jing Hai Zhou, Hong Hai, and Yan Sheng Song. "Pullout Test Study on Flexible Joint of Ductile Iron Buried Pipelines." Advanced Materials Research 368-373 (October 2011): 1130–33. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.1130.

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Axial pullout test on ductile iron buried pipelines with MTS testing machine was carried out, the relation curve between axial tension and flexiable joint displacement was gotten, the functional failure mechanism of flexible joint of buried pipeline was discussed. The results indicate that there is relative displacement between pipe and soil under seismic action, meanwhile, the acting force between pipe and soil is the viscous damping force which is related to pipe-soil relative speed.

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30

Awal, Md Rabiul, Nurul Atiqah Tajulmar, Muhammad Syarifuddin Yahya, et al. "Crack Tracking in Small-Diameter Metal Pipe Using Controlled Motor Vibrations and Flexible Sensor." IIUM Engineering Journal 26, no. 2 (2025): 51–62. https://doi.org/10.31436/iiumej.v26i2.2988.

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Metal pipes are the most integral part of transporting water, gas, and other petrochemical substances over long distances. Higher strength, durability (along with wear and corrosion resistance), and lower cost make these pipes suitable for extreme weather conditions and hostile environments. Over time, these pipes experience significant impacts that may lead to defects such as holes, cracks, bends, corrosion, and finally component failure and property losses. Therefore, early detection of the defects in pipes is crucial to prevent such failures. There are several methods to detect defects in m

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31

Helgaker, J. F., S. IJzermans, T. J. Landheim, T. B. Eeg, S. M. Hverven, and P. Piotrowski. "Large-Scale Erosion Testing of an Unbonded Flexible Pipe." SPE Journal 22, no. 03 (2016): 736–45. http://dx.doi.org/10.2118/181761-pa.

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Summary Unbonded flexible pipelines are commonly used in offshore field developments to transport oil and gas to production facilities. Sand is an inevitable byproduct from oil-and-gas production. Sand erosion has become an important concern for both design of new field developments and prolongation of existing oil-and-gas fields, especially for fields with low mixture density and high velocities. Erosion in smooth pipes can be determined with industry-standard erosion-prediction methodologies. However, these models are usually valid for smooth pipes only, with limited information available on

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32

Shan, Yongti, Guijun Shi, Qunfang Hu, Yunhui Zhang, and Fu Wang. "Numerical Investigation of the Short-Term Mechanical Response of Buried Profiled Thermoplastic Pipes with Different Diameters to External Loads." Mathematical Problems in Engineering 2021 (May 24, 2021): 1–18. http://dx.doi.org/10.1155/2021/8853959.

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High-density polyethylene (HDPE) double-wall corrugated pipe is a flexible buried pipe widely used in municipal drainage, and its deformation is affected by the compactness of the surrounding soil. This paper uses the ABAQUS to establish a three-dimensional pipe-soil model of double-wall corrugated pipes, and the mechanical response behavior of corrugated pipes with different nominal diameters subject to external loads is studied. The results show that the strain distribution characteristics for pipes with different diameters are very similar, and the circumferential strain value at critical p

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33

Primin, Oleg, and Vladimir Orlov. "Static calculations in the context of sewer pipe sliplining by polymer hose." MATEC Web of Conferences 178 (2018): 09019. http://dx.doi.org/10.1051/matecconf/201817809019.

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The growing deterioration and unsatisfactory technical condition of the pipes of water supply and wastewater disposal networks in Russian cities and other inhabited localities, as well as limited (under the conditions of Russian housing and utilities sector reforming) funding of pipeline renovation and rehabilitation have considerably aggravated the problem of pipe reliability provision. These factors make pipe renovation and rehabilitation quite a topical issue. A very promising trend in the field of pipeline construction and renovation named “trenchless technologies” has been commonly used i

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34

Setiyana, Budi, M. Rafli, and Muchammad. "Analysis of the Damage of Flexible Joint in Fuel Oil Pipelines Directed to Storage Tanks at PT X." International Research Journal of Innovations in Engineering and Technology 08, no. 09 (2024): 165–69. http://dx.doi.org/10.47001/irjiet/2024.809020.

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In piping systems, flexible joints can mean connections or elements designed to absorb movement or pressure that can occur in pipes, such as temperature changes or ground movements. This function can help prevent cracks or damage to the pipe system. The use of flexible joints in oil piping aims to maintain the integrity of the pipe system, prevent leaks, and reduce pressure that can damage pipes or other devices. This is critical especially in the oil and gas industry environment which has dynamic operational conditions. The purpose of this study was to find out how to maintain flexible joints

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35

Koretskiy, A. S., A. I. Lantuh-Lyaschenko, and K. V. Medvedev. "ANALYSIS OF FUNNELS EVALUATION MODEL BY THE “CONSTRUCTION-SOIL” SYSTEM." Science and Transport Progress, no. 33 (August 25, 2010): 131–37. http://dx.doi.org/10.15802/stp2010/13189.

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Recently in the European countries the designs of flexible pipes and pipe bridges, the bearing capacity of which is provided by passive resistance of soil, have found more applications. The paper presents an analysis of existing models for calculating flexible pipes working as a system «construction-soil». The numerical example for calculating such construction design using software package SCAD is given.

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Park, Joon-Seok, Won-Hee Hong, Wan Lee, Jung-Hwan Park, and Soon-Jong Yoon. "Pipe Stiffness Prediction of Buried Gfrp Flexible Pipe." Polymers and Polymer Composites 22, no. 1 (2014): 17–24. http://dx.doi.org/10.1177/096739111402200103.

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37

Gu, Fan, Hui Xin Wang, and Li Sun. "Numerical Study on Mechanical Response of Steel Wire Wound Reinforced Rubber Flexible Pipe under Internal Pressure." Advanced Materials Research 594-597 (November 2012): 2668–71. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2668.

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According to the actual structure of steel wire wound reinforced rubber flexible pipe, using the finite element software ANSYS, 3-D finite element model of flexible pipe is established. For the mechanical response of flexible pipe under internal pressure, the comparison on the result by numerical calculation, the static loading test and the result by analytic method shows that the 3-D finite element model of flexible pipe is rational. Moreover, based on the finite element model of flexible pipe, the influence of internal pressure, spanning length and reinforced steel wire diameter on the axial

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38

Maleki, I., and O. Rahmani. "A closed-form solution for the bending analysis of composite sandwich pipe with compliance core based on high-order sandwich theory." Journal of Sandwich Structures & Materials 22, no. 6 (2018): 1786–811. http://dx.doi.org/10.1177/1099636218789622.

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In this paper, bending of cylindrical sandwich pipes based on the high-order theory of sandwich structures with flexible core is investigated. The cylindrical sandwich pipe is composed of a flexible core and two composite face sheets. Behavior of the cylindrical sandwich pipe is described by a high-order sandwich shell theory, which explains nonlinear distortions of cross-sectional plane of the flexible core as well as changes in its height. The theory based on variational principles and using an extremely thorough systematic closed-form approach is formulated. In this model, no assumption has

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Kustyshev, A. V., D. A. Kustyshev, I. A. Kustyshev, and Yu V. Vaganov. "RETRIEVING A STUCK FLEXIBLE PIPE FROM A WELL USING CUTTING AND FISHING TOOLS RUN INTO THE HOLE ON THE FLEXIBLE PIPE." Oil and Gas Studies, no. 4 (August 30, 2015): 64–68. http://dx.doi.org/10.31660/0445-0108-2015-4-64-68.

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This paper discusses the method for retrieving the stuck flexible pipe during an idle well recovery in the conditions of abnormally low reservoir pressures. The most common are methods with using a flexible pipe, which are mainly related to the downhole flushing off the clay-sand bridges, the hole hydrate-paraffin deposits thawing, treatment of the bottom-hole zone with chemical compositions. It is emphasized that no experience exists in retrieving the stuck flexible pipe from the breakdown well with a detached flexible pipe in it.

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Gu, Fan, Dan Wang, Hui Xin Wang, and Jia Quan Sun. "Study on the Influence of Transverse Load on the Mechanical Response of Submarine Flexible Pipe." Applied Mechanics and Materials 256-259 (December 2012): 1042–45. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.1042.

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Taking 1 year return period wave data statistics of Cheng Dao sea area as an example, the wave-current flow hydrodynamic load acting on submarine flexible pipe was analyzed. According to the actual structure of submarine flexible pipe, ANSYS numerical model was established. Under the combined effect of internal operating pressure and transverse wave-current flow hydrodynamic load, the results calculated by numerical model shows that with the increase of transverse load, the bending deformation of flexible pipe increases linearly, and the stress of flexible pipe is almost constant.

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Wang, Man, Rui Xiang Bai, and Mao Jun Zhou. "Finite Element Model and Bending for Marine Composite Flexible Pipes." Advanced Materials Research 690-693 (May 2013): 314–17. http://dx.doi.org/10.4028/www.scientific.net/amr.690-693.314.

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The parameterizationmodeling of typical composite flexible pipe is studied by ANSYS two-developmentlanguage APDL, which established the model building of the spiral self-lockinglayer and scanning division meshes. The stress response of the typicalfive-layer composite flexible pipe was calculated under bending load byadopting the no slip assumptions. It is easy to modify the parameters offlexible pipe structure by using the parameterization modeling. Theparameterization modeling can be used for the optimal design of flexible pipe.

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Thépot, Olivier, and Roger Frank. "Mesure du module en petites déformations d'un sol autour d'une conduite enterrée : présentation d'un nouvel essai in situ." Canadian Geotechnical Journal 37, no. 4 (2000): 909–17. http://dx.doi.org/10.1139/t00-009.

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A new method of measurement of backfill stiffness around buried flexible pipe is presented. It consists of using flexible pipe as an expanding pressiometric probe. The pipe dilatation is obtained by an internal jacking test that causes a relatively small three-dimensional "ovalization" around 0.05%. We obtain a force-displacement curve along the force axis as well as the damping of the displacement in the longitudinal direction up to one diameter in range. Knowing the pipe mechanical characteristics, we can calculate Young's modulus of the backfill in the domain of small deformations. The pape

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Monprapussorn, T., C. Athisakul, and S. Chucheepsakul. "Nonlinear Vibrations of an Extensible Flexible Marine Riser Carrying a Pulsatile Flow." Journal of Applied Mechanics 74, no. 4 (2006): 754–69. http://dx.doi.org/10.1115/1.2711226.

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The influence of transported fluid on static and dynamic behaviors of marine risers is investigated. The internal flow of the transported fluid could have a constant, a linear, or a wave velocity. The riser pipe may possibly experience the conditions of high extensibility, flexibility, and large displacements. Accordingly, the mathematical riser models should be governed by the large strain formulations of extensible flexible pipes transporting fluid. Nonlinear hydrodynamic dampings due to ocean wave–pipe interactions implicate the high degree of nonlinearity in the riser vibrations, for which

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Fattah, Mohammed Y., Bushra S. Zbar, and Hala H. M. Al-Kalali. "Experimental Investigation of the Performance of Buried Flexible Pipe in Reinforced Sand." Slovak Journal of Civil Engineering 31, no. 2 (2023): 48–60. http://dx.doi.org/10.2478/sjce-2023-0012.

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Abstract The experimental work of this study deals with the performance of pipe in sand with various responses subjected to incremental static loading where the backfill is reinforced with two types of reinforcement (geogrid and geocell) to investigate the effects of backfill cover. The pipes considered are installed in sand with different densities; i.e., loose, medium and dense sand, and a constant burial depth (2D, where D is the pipe diameter). It was concluded that the maximum deformation occurs at the crown of the pipe. The deformation increases when the sand density decreases. For a bur

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Zhao, Lin, and Ming Lei Liu. "On the Design and Materials Selection of Composite Material Ocean Flexible Pipe." Advanced Materials Research 1090 (February 2015): 22–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1090.22.

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This paper aims to discuss the composite materials application in ocean oil and gas flexible pipes, from the functional principles to the technical methodology in materials selection and pipe structure design.

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Yan, Han, Guanghan Yan, Mingrui Sun, Jun Zhang, Kangjie Liu, and Yu Liu. "Research on the influence of bamboo pipe structure parameters on fluid heat transfer characteristics." Journal of Physics: Conference Series 2835, no. 1 (2024): 012072. http://dx.doi.org/10.1088/1742-6596/2835/1/012072.

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Abstract In recent years, heat exchangers have been widely applied in the chemical, petroleum, and power industries, and pipe-type heat exchangers have the advantages of good heat transfer, strong structure, and flexible operation. The side reinforcement of pipe-type heat exchangers is usually achieved using asymmetric pipes, but the existing asymmetric pipes often need help with easy corrosion and difficult processing. To address this issue, this paper proposes a new reed pipe structure based on the reed pipe structure. Focusing on the structural variables of reed pipes and the influence of R

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Costa, Yuri D., Lucas S. Moraes, and Carina L. Costa. "Soil Stresses on Carbon Steel Pipe Undergoing Uplift." Applied Mechanics and Materials 835 (May 2016): 439–43. http://dx.doi.org/10.4028/www.scientific.net/amm.835.439.

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This paper presents a three-dimensional numerical study to evaluate the variations in stresses in the soil mass surrounding a carbon steel pipe class API 5L X60 submitted to uplift due to ground elevation. Analyses were carried out for soil relative density, pipe stiffness and surficial surcharge loading. Results have shown that stress variations due to uplift are lower for looser backfill soils and flexible pipes. Stress variations in pipe invert are meaningful in the vicinity of the region between stable and unstable soil masses.

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Shevchenko, Nataliya, Vladyslav Kaliuzhnyi, and Viktoriia Andriievska. "NUMERICAL SIMULATION OF PROCESS FLUID FLOW IN THE PIPES OF A COILED TUBING INSTALLATION." Bulletin of the National Technical University "KhPI". Series: Hydraulic machines and hydraulic units, no. 1 (October 10, 2023): 60–65. http://dx.doi.org/10.20998/2411-3441.2023.1.10.

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Today, one of the modern trends is the use of coiled tubing technologies and improvement of the composition of washing agents (liquids). The features of coiled tubing technological sections are considered – spiral pipe laying, the ratio of the main dimensions of flexible pipes, drum and guide sector. The presence of a pipe conveyor gives special responsibility for ensuring the movement of a string of flexible pipes within a given load range. The length of the pipes reaches 5000 m. The radial dimensions of the well are 150 mm. The stages of determining the main parameters of a pumping unit for

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Gu, Fan, Hui Xin Wang, Dan Wang, and Jia Quan Sun. "Influence of Suspension Length on the Mechanical Response of Submarine Flexible Pipe under Internal Pressure and Transverse Load." Advanced Materials Research 671-674 (March 2013): 884–87. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.884.

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According to the actual structure of submarine flexible pipe, considering the combined effect of internal pressure and transverse load by wave-current flow that is based on 50 year return period wave statistics data of Cheng Dao sea area, ANSYS finite element model of flexible pipe is established. The influence of internal pressure and suspension length on the axial stress of steel wire reinforcement layer and the Mises stress of rubber layer was analyzed. Comparatively, suspension is the main cause for the failure of steel submarine pipeline, but could hardly lead to the failure of submarine

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Vaganov, Yu V., M. V. Listak, and M. Ya Kalimulina. "SOME EXPERIENCE OF REMOVING THE STUCK FLEXIBLE PIPE FROM THE WELL IN THE PROCESS OF SIDE HOLE DRILLING AND POSSIBLE WAYS OF SUCH TECHNOLOGY PERFECTION." Oil and Gas Studies, no. 2 (April 30, 2015): 42–45. http://dx.doi.org/10.31660/0445-0108-2015-2-42-45.

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This article subject of study is a method of retrieving the stuck flexible pipe during the inactive well rehabilitation in the process of string side-hole drilling under the abnormally low reservoir pressure conditions. It is mentioned that the most common are methods using a flexible pipe which are related predominantly with the bottomhole flushing to remove clay-sand bridges, thawing the hole to eliminate hydrate-paraffin deposits, the bottomhole zone treatment with chemical compositions. It is emphasized that there is not enough experience of side-hole drilling using a flexible pipe and pra

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