The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
Jing Gong - One of the best experts on this subject based on the ideXlab platform.
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a reliability assessment of the hydrostatic test of Pipeline with 0 8 design factor in the west east china natural gas Pipeline iii
Energies, 2018Co-Authors: Lei He, Weichao Yu, Jing GongAbstract:The use of 0.8 design factor in Chinese Pipeline Industry is a breakthrough with the success of the test pipe section in the west–east China gas Pipeline III. For such a design factor, the traditional P-V (Pressure-Volume) curve based pressure test control cannot describe the details of the process, and the 0/1 type failure is not an efficient index to show the safety level of the Pipeline. In this paper, a reliability based assessment method is proposed to monitor the real-time failure probability of the Pipeline during the hydrostatic test process. The reliability index can be used as the degree of risk. Following the actual hydrostatic testing of a test pipe section with 0.8 design factor in the west–east China gas Pipeline III, reliability analysis was performed using Monte Carlo technique. The basic values of input parameters of the limit state equations are based on the data collected from either the tested section or the recommended value in the codes. The analysis of limit states, i.e., the yielding deformation and the excessive plastic deformation of Pipeline, proceeded based on these distributions. Finally, it is found that the gradually increased water pressure makes the failure probability increase accordingly. A reliability assessment method was proposed and illustrated with the practical pressure test process.
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A Reliability Assessment of the Hydrostatic Test of Pipeline with 0.8 Design Factor in the West–East China Natural Gas Pipeline III
Energies, 2018Co-Authors: Lei He, Weichao Yu, Jing GongAbstract:The use of 0.8 design factor in Chinese Pipeline Industry is a breakthrough with the success of the test pipe section in the west–east China gas Pipeline III. For such a design factor, the traditional P-V (Pressure-Volume) curve based pressure test control cannot describe the details of the process, and the 0/1 type failure is not an efficient index to show the safety level of the Pipeline. In this paper, a reliability based assessment method is proposed to monitor the real-time failure probability of the Pipeline during the hydrostatic test process. The reliability index can be used as the degree of risk. Following the actual hydrostatic testing of a test pipe section with 0.8 design factor in the west–east China gas Pipeline III, reliability analysis was performed using Monte Carlo technique. The basic values of input parameters of the limit state equations are based on the data collected from either the tested section or the recommended value in the codes. The analysis of limit states, i.e., the yielding deformation and the excessive plastic deformation of Pipeline, proceeded based on these distributions. Finally, it is found that the gradually increased water pressure makes the failure probability increase accordingly. A reliability assessment method was proposed and illustrated with the practical pressure test process.
Lei He - One of the best experts on this subject based on the ideXlab platform.
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a reliability assessment of the hydrostatic test of Pipeline with 0 8 design factor in the west east china natural gas Pipeline iii
Energies, 2018Co-Authors: Lei He, Weichao Yu, Jing GongAbstract:The use of 0.8 design factor in Chinese Pipeline Industry is a breakthrough with the success of the test pipe section in the west–east China gas Pipeline III. For such a design factor, the traditional P-V (Pressure-Volume) curve based pressure test control cannot describe the details of the process, and the 0/1 type failure is not an efficient index to show the safety level of the Pipeline. In this paper, a reliability based assessment method is proposed to monitor the real-time failure probability of the Pipeline during the hydrostatic test process. The reliability index can be used as the degree of risk. Following the actual hydrostatic testing of a test pipe section with 0.8 design factor in the west–east China gas Pipeline III, reliability analysis was performed using Monte Carlo technique. The basic values of input parameters of the limit state equations are based on the data collected from either the tested section or the recommended value in the codes. The analysis of limit states, i.e., the yielding deformation and the excessive plastic deformation of Pipeline, proceeded based on these distributions. Finally, it is found that the gradually increased water pressure makes the failure probability increase accordingly. A reliability assessment method was proposed and illustrated with the practical pressure test process.
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A Reliability Assessment of the Hydrostatic Test of Pipeline with 0.8 Design Factor in the West–East China Natural Gas Pipeline III
Energies, 2018Co-Authors: Lei He, Weichao Yu, Jing GongAbstract:The use of 0.8 design factor in Chinese Pipeline Industry is a breakthrough with the success of the test pipe section in the west–east China gas Pipeline III. For such a design factor, the traditional P-V (Pressure-Volume) curve based pressure test control cannot describe the details of the process, and the 0/1 type failure is not an efficient index to show the safety level of the Pipeline. In this paper, a reliability based assessment method is proposed to monitor the real-time failure probability of the Pipeline during the hydrostatic test process. The reliability index can be used as the degree of risk. Following the actual hydrostatic testing of a test pipe section with 0.8 design factor in the west–east China gas Pipeline III, reliability analysis was performed using Monte Carlo technique. The basic values of input parameters of the limit state equations are based on the data collected from either the tested section or the recommended value in the codes. The analysis of limit states, i.e., the yielding deformation and the excessive plastic deformation of Pipeline, proceeded based on these distributions. Finally, it is found that the gradually increased water pressure makes the failure probability increase accordingly. A reliability assessment method was proposed and illustrated with the practical pressure test process.
Weichao Yu - One of the best experts on this subject based on the ideXlab platform.
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a reliability assessment of the hydrostatic test of Pipeline with 0 8 design factor in the west east china natural gas Pipeline iii
Energies, 2018Co-Authors: Lei He, Weichao Yu, Jing GongAbstract:The use of 0.8 design factor in Chinese Pipeline Industry is a breakthrough with the success of the test pipe section in the west–east China gas Pipeline III. For such a design factor, the traditional P-V (Pressure-Volume) curve based pressure test control cannot describe the details of the process, and the 0/1 type failure is not an efficient index to show the safety level of the Pipeline. In this paper, a reliability based assessment method is proposed to monitor the real-time failure probability of the Pipeline during the hydrostatic test process. The reliability index can be used as the degree of risk. Following the actual hydrostatic testing of a test pipe section with 0.8 design factor in the west–east China gas Pipeline III, reliability analysis was performed using Monte Carlo technique. The basic values of input parameters of the limit state equations are based on the data collected from either the tested section or the recommended value in the codes. The analysis of limit states, i.e., the yielding deformation and the excessive plastic deformation of Pipeline, proceeded based on these distributions. Finally, it is found that the gradually increased water pressure makes the failure probability increase accordingly. A reliability assessment method was proposed and illustrated with the practical pressure test process.
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A Reliability Assessment of the Hydrostatic Test of Pipeline with 0.8 Design Factor in the West–East China Natural Gas Pipeline III
Energies, 2018Co-Authors: Lei He, Weichao Yu, Jing GongAbstract:The use of 0.8 design factor in Chinese Pipeline Industry is a breakthrough with the success of the test pipe section in the west–east China gas Pipeline III. For such a design factor, the traditional P-V (Pressure-Volume) curve based pressure test control cannot describe the details of the process, and the 0/1 type failure is not an efficient index to show the safety level of the Pipeline. In this paper, a reliability based assessment method is proposed to monitor the real-time failure probability of the Pipeline during the hydrostatic test process. The reliability index can be used as the degree of risk. Following the actual hydrostatic testing of a test pipe section with 0.8 design factor in the west–east China gas Pipeline III, reliability analysis was performed using Monte Carlo technique. The basic values of input parameters of the limit state equations are based on the data collected from either the tested section or the recommended value in the codes. The analysis of limit states, i.e., the yielding deformation and the excessive plastic deformation of Pipeline, proceeded based on these distributions. Finally, it is found that the gradually increased water pressure makes the failure probability increase accordingly. A reliability assessment method was proposed and illustrated with the practical pressure test process.
Chris Alexander - One of the best experts on this subject based on the ideXlab platform.
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a systematic approach for evaluating dent severity in a liquid transmission Pipeline system
2010 8th International Pipeline Conference Volume 1, 2010Co-Authors: Chris Alexander, Eelco JorritsmaAbstract:An API 579 Level 3 assessment was performed to determine the stresses in a 2% dent in a 20-inch × 0.406-inch Pipeline. The intent was to determine the stress concentration factor (SCF) in the dent with a finite element model using geometry data provided from an in-line inspection caliper run. In addition to the analytically-derived SCF, data were also evaluated from a recent experimental study involving a plain dent subjected to cyclic pressure conditions with a profile comparable to the dent in question. This sample was cycled at a stress range of 70% SMYS and failed after 10,163 cycles had been applied. Using the DOE-B mean fatigue curve, combined with the experimental fatigue life, the resulting SCF factor was derived to be 4.20. This value is within 1% of the calculated FEA-based SCF and served to confirm the technical validity of the SCF. The operator provided historical pressure data covering a 12-month period and a rainflow count analysis was performed on the data. Using this data, along with the API X′ design fatigue curve, the estimated remaining life was determined for the dent in question and conservatively estimated to be 65 years. This paper provides details on the analysis methodology and associated results, discussions on the empirically-derived SCF with its use in validating the analytical SCF, and application of the results to estimate the remaining life of the Pipeline system. It is the intent of the authors to provide the Pipeline Industry with a systemic approach for evaluating dent severity using caliper and operating pressure history data.Copyright © 2010 by ASME
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repair of dents subjected to cyclic pressure service using composite materials
2010 8th International Pipeline Conference Volume 1, 2010Co-Authors: Chris Alexander, Julian BedoyaAbstract:For the better part of the past 15 years composite materials have been used to repair corrosion in high pressure gas and liquid transmission Pipelines. This method of repair is widely accepted throughout the Pipeline Industry because of the extensive evaluation efforts performed by composite repair manufacturers, operators, and research organizations. Pipeline damage comes in different forms, one of which involves dents that include plain dents, dents in girth welds and dents in seam welds. An extensive study has been performed over the past several years involving multiple composite manufacturers who installed their repair systems on the above mentioned dent types. The primary focus of the current study was to evaluate the level of reinforcement provided by composite materials in repairing dented Pipelines. The test samples were pressure cycled to failure to determine the level of life extension provided by the composite materials relative to a set of unrepaired test samples. Several of the repaired dents in the study did not fail even after 250,000 pressure cycles were applied at a range of 72% SMYS. The results of this study clearly demonstrate the significant potential that composite repair systems have, when properly designed and installed, to restore the integrity of damaged Pipelines to ensure long-term service.Copyright © 2010 by ASME
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EVALUATING THE USE OF COMPOSITE MATERIALS IN REINFORCING OFFSHORE RISERS USING FULL-SCALE TESTING METHODS
2007Co-Authors: Chris AlexanderAbstract:Composite systems are a generally-accepted method for repairing corroded and mechanically-damaged onshore Pipelines. The Pipeline Industry has arrived at this point after more than 15 years of research and investigation. Because the primary method of loading for onshore Pipelines is in the circumferential direction due to internal pressure, most composite systems have been designed and developed to provide hoop strength reinforcement. On the other hand, offshore pipes (especially risers), unlike onshore Pipelines, can experience significant tension and bending loads. As a result, there is a need to evaluate the current state of the art in terms of assessing the use of composite materials in repairing offshore Pipelines and risers. The paper presents findings conducted as part of a joint Industry effort involving the Minerals Management Service, the Offshore Technology Research Center at Texas A&M University, Stress Engineering Services, Inc., and several composite repair manufacturers was undertaken to assess the state of the art using full-scale testing methods. Loads typical for offshore risers were used in the test program that integrated internal pressure, tension, and bending loads. This program is the first of its kind and likely to contribute significantly to the future of offshore riser repairs. It is anticipated that the findings of this program will foster future investigations involving operators by integrating their insights regarding the need for composite repair based on emerging technology. PROGRAM OVERVIEW The program incorporated 8.625-inch x 0.406-inch, Grade X46 pipe test samples that were prepared with simulated corrosion by machining. The program destructively tested a total of 12 separate samples with three being repaired by each of the four manufacturers. The tests included a burst test (increasing pressure to failure), a tension-to-failure test (pressure held constant with increasing axial tension loads to failure), and a four-point bend test (pressure and tension held constant with increasing bending loads to achieve significant yielding in steel pipe) for each of the repair systems. The four-team Joint Industry Project (JIP) was formed to assess the current state of the art. Each repair system was evaluated considering a combination of pressure, tension, and bending loads. To maintain anonymity, each company’s product was assigned a letter reference designation as noted below. Product A – this system uses an E-glass fiber system in a wateractivated urethane matrix. The fiber cloth is a balanced plain-weave with orthogonal fibers aligned at 0 and 90 degrees relative to the axis of the pipe . During installation, the cloth was oriented either axially or circumferentially to achieve the desired level of reinforcement. Product B – this system uses an E-glass fiber system in a wateractivated urethane matrix. The cloth for this system also uses a balanced weave. This particular repair incorporated an epoxy filler material in the corroded region, as opposed to placing composite material in this region of the repair. All of the other manufacturers chose to install fibers in the corroded region. During installation, the cloth was oriented either axially of circumferentially to achieve the desired level of reinforcement. Due to issues encountered during testing with uncured resins, no results are presented for this system. Product C – this system uses a carbon fiber system in an epoxy matrix. The cloth is a stitched fabric with uniaxial fibers. During installation, the fibers were aligned at 0 and 90 degrees relative to the axis of the pipe to achieve the desired level of reinforcement.
Herdiyanti Jihan - One of the best experts on this subject based on the ideXlab platform.
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Comparisons study of S-Lay and J-Lay methods for Pipeline installation in ultra deep water
University of Stavanger Norway, 2013Co-Authors: Herdiyanti JihanAbstract:The Pipeline Industry has developed its technical capabilities to enable operations in deeper water. In ultra deepwater developments, the offshore Industry has been challenged to solve demanding tasks, to develop new and reliable installation technologies for deepwater and uneven seafloor conditions, and to discover technology to deal with harsh environmental conditions. Pipeline installation in deeper water area needs special considerations regarding the lay vessel capabilities. These capabilities are that the vessel should have enough tension capacity for the deeper water and good dynamic positioning system restricted to small movements only. Two common methods used to install Pipeline are the S-Lay and J-Lay methods. Some parameters need to be considered when choosing the appropriate installation method, therefore limitations for each methods are investigated. For the S-Lay method, these important parameters Include vessel tension capacity, stinger length, stinger curvature, strain in the overbend region and bending moment in the sagbend region. The maximum depth at which a given Pipeline can be laid could be increased with a longer stinger of the lay barge and bigger vessel tension capacity. However, choosing these options may require clamping to pull the Pipeline that can cause a heavy mooring system and high risk associated with a very long stinger subject to hydrodynamic forces. In addition, these options also could destroy the pipe coating. On the contrary with the S-Lay method, the J-Lay method reduces any horizontal reaction on the vessel’s equipment, and because of this, the J-Lay technology might be used to meet project requirements in deeper water. However, the capability of the J-Lay method in deep and very deep waters requires barges with dynamic positioning capabilities. This is because positioning by spread mooring with anchors would always be worthless and often unfeasible due to the safety of operations. Under extreme conditions, the loading process induced by the lay barge response to wave actions in deep waters is less severe for J-lay method compared to other methods. However, special attention has to be paid to the complex nature of vortex shedding induced oscillations along the suspended Pipeline span. Considering the aspects mentioned above, studies will be carried out in this master thesis. The thesis will expose two Pipeline installation methods, i.e. S-Lay and J-Lay methods for various water depths and pipe sizes. Starting from 800 m to 4000 m water depth, pipe sizes more than 24 inch will be investigated. The effect of increasing strain in the overbend region and effect of reducing the stinger length will be studied to meet these challenges and to improve the laying efficiency especially using the S-lay method. Plot for various water depths and Pipeline properties will be presented as the results of this master thesis. The installation analysis will be performed by using computer program SIMLA
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Comparisons study of S-Lay and J-Lay methods for Pipeline installation in ultra deep water
University of Stavanger Norway, 2013Co-Authors: Herdiyanti JihanAbstract:Master's thesis in Offshore technologyThe Pipeline Industry has developed its technical capabilities to enable operations in deeper water. In ultra deepwater developments, the offshore Industry has been challenged to solve demanding tasks, to develop new and reliable installation technologies for deepwater and uneven seafloor conditions, and to discover technology to deal with harsh environmental conditions. Pipeline installation in deeper water area needs special considerations regarding the lay vessel capabilities. These capabilities are that the vessel should have enough tension capacity for the deeper water and good dynamic positioning system restricted to small movements only. Two common methods used to install Pipeline are the S-Lay and J-Lay methods. Some parameters need to be considered when choosing the appropriate installation method, therefore limitations for each methods are investigated. For the S-Lay method, these important parameters Include vessel tension capacity, stinger length, stinger curvature, strain in the overbend region and bending moment in the sagbend region. The maximum depth at which a given Pipeline can be laid could be increased with a longer stinger of the lay barge and bigger vessel tension capacity. However, choosing these options may require clamping to pull the Pipeline that can cause a heavy mooring system and high risk associated with a very long stinger subject to hydrodynamic forces. In addition, these options also could destroy the pipe coating. On the contrary with the S-Lay method, the J-Lay method reduces any horizontal reaction on the vessel’s equipment, and because of this, the J-Lay technology might be used to meet project requirements in deeper water. However, the capability of the J-Lay method in deep and very deep waters requires barges with dynamic positioning capabilities. This is because positioning by spread mooring with anchors would always be worthless and often unfeasible due to the safety of operations. Under extreme conditions, the loading process induced by the lay barge response to wave actions in deep waters is less severe for J-lay method compared to other methods. However, special attention has to be paid to the complex nature of vortex shedding induced oscillations along the suspended Pipeline span. Considering the aspects mentioned above, studies will be carried out in this master thesis. The thesis will expose two Pipeline installation methods, i.e. S-Lay and J-Lay methods for various water depths and pipe sizes. Starting from 800 m to 4000 m water depth, pipe sizes more than 24 inch will be investigated. The effect of increasing strain in the overbend region and effect of reducing the stinger length will be studied to meet these challenges and to improve the laying efficiency especially using the S-lay method. Plot for various water depths and Pipeline properties will be presented as the results of this master thesis. The installation analysis will be performed by using computer program SIMLA.2015-06-1
