Volume 5: Pipelines, Risers, and Subsea Systems最新文献

{"title":"Assessing the Impact of Riser-Soil Interaction Model on the Fatigue Life of Large Diameter SCRs","authors":"R. Hejazi, A. Grime, M. Randolph, M. Efthymiou","doi":"10.1115/OMAE2018-78713","DOIUrl":"https://doi.org/10.1115/OMAE2018-78713","url":null,"abstract":"This paper investigates the effect of riser-soil interaction model selection on the assessment of steel catenary riser (SCR) fatigue life for realistic environmental conditions at a deep-water Australian North west shelf (NWS) site. Using a fatigue wave scatter diagram consisting of 100 metocean conditions at the site (combining irregular seas, swell and current), a dynamic time-domain finite element analysis is coupled with the rain-flow cycle counting algorithm in order to determine the fatigue life of SCRs due to first-order motions of the host floater. Rigid, linear elastic and nonlinear riser-soil interaction models are used in order to assess the impact of model selection on the fatigue life of example deep-water SCRs of varying diameter. It is shown that the use of a nonlinear riser-soil interaction model for a representative deep-water NWS site can give an almost two-fold increase in SCR fatigue life over a stiff linear seabed assumption, albeit at a significant computational expense. It is further shown that a recently developed method for calculating equivalent linear soil stiffness may be used in place of the computationally expensive nonlinear approach in order to estimate SCR fatigue life to a reasonable level of accuracy. A methodology for applying the equivalent linear stiffness method to irregular sea-states is proposed and general insight into the selection of the most appropriate soil-riser interaction model for the fatigue analysis of large diameter deep-water SCRs is provided.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124023362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Equivalent Layer Approaches to Predict the Bisymmetric Hydrostatic Collapse Strength of Flexible Pipes","authors":"J. Sousa, Marcelo K. Protasio, L. Sagrilo","doi":"10.1115/OMAE2018-78146","DOIUrl":"https://doi.org/10.1115/OMAE2018-78146","url":null,"abstract":"The hydrostatic collapse strength of a flexible pipe is largely dependent on the ability of its carcass and pressure armor to resist radial loading and, therefore, its prediction involves an adequate modeling of these layers. Hence, initially, this work proposes a set of equations to estimate equivalent thicknesses and physical properties for these layers, which allows their modeling as equivalent orthotropic cylinders. These equations are obtained by simulating several two-point static ring tests with a three-dimensional finite element (FE) model based on beam elements and using these results to form datasets that are analyzed with a symbolic regression (SR) tool. The results of these analyses are the closed-form equations that best fit the provided datasets. After that, these equations are used in conjunction with a three-dimensional shell FE model and a previously presented analytical model to study the dry and wet hydrostatic collapse mechanisms of a flexible pipe. The predictions of these models agreed quite well with the collapse pressures obtained in experimental tests thus indicating that the use of the equivalent approach is promising.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133471115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parametric Model of Dead Leg Steady-State Thermal Performance","authors":"A. Sanchis, S. Andersson, A. Jensen","doi":"10.1115/OMAE2018-78407","DOIUrl":"https://doi.org/10.1115/OMAE2018-78407","url":null,"abstract":"During thermal design of Subsea Production Systems (SPS), Computational Fluid Dynamics (CFD) is used to calculate production fluid temperatures in dead legs of the system. One purpose of such simulations could be to calculate the amount of insulation needed to avoid low temperatures in the piping system. A novel approach to this type of analysis is presented here to build a parametric model able to map the dead leg performance against any set of input parameters. The workflow relies on a response surface analysis performed from the results of a limited set of CFD simulations run on a sparse simulation matrix that covers the design space. Once generated, the parametric model provides real-time results and may be used for screening, optimization or condition monitoring purposes.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131611122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel Erosion Control Technology for Production Debottlenecking","authors":"P. Kane, D. Pliszka","doi":"10.1115/OMAE2018-78033","DOIUrl":"https://doi.org/10.1115/OMAE2018-78033","url":null,"abstract":"Erosion of piping systems is a significant issue for many operators of Hydrocarbon infrastructure. Until now mitigation measures have been limited to detection / measurement and reducing production. For many operators this can be a significant loss in revenue and an increase in IMR costs. A novel Erosion Control Technology (ECT) is being developed that can significantly reduce the impact of erosion on piping infrastructure. This technology has the potential of adding immense value when it is used to debottleneck and optimize flow rates. The patented ECT has been designed to control sand erosion in real-time by deflecting and redistributing sand in the product flow stream.\u0000 Preliminary laboratory testing of the ECT has been very successful. The ECT inserts designed for the ambient test conditions have shown substantial reduction in erosion (both global and local). Computational Fluid Dynamics (CFD) has been the key enabling factor allowing the critical breakthrough in this technology. Experimental results have shown very good correlation with the CFD sand erosion model results. A roadmap in line with industry practices and standards has been developed for project implementation of the ECT solution in the near future.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132289679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Comparison Study on Processing ILI Data With Different Filtering Methods","authors":"Zhenhui Liu, Stig Olav Kvarme, Odd Einar Lindøe","doi":"10.1115/OMAE2018-77006","DOIUrl":"https://doi.org/10.1115/OMAE2018-77006","url":null,"abstract":"In-line inspection (ILI) data processing is a crucial process on assessing the remaining capacity of corroded pipelines. It is used to generate the RBP (river bottom profile) or M AV (moving average) file which could be further used in the capacity calculations. There are large uncertainties regarding the qualities of ILI data itself, which are dependent on the accuracies of the ILI tool, the reporting method and the condition of the inspected pipelines et. al. It is thus required that the post-process of the ILI data should not add more uncertainties to the capacity check. Challenges exist on generating reliable RBP/MAV from the ILI data on general base. This paper originates from work during the in-house software development for corroded pipeline tool. Three different algorithms on filtering the ILI data are examined. They are the method recommended by DNV-RP-F101 (with modification), the median filter algorithm and the gaussian filter algorithm. The latter two algorithms are from standard methods for image denoising. A comparison study has been performed with several actual ILI data sets. Finally, conclusions and suggestions have been made, which may provide useful hints for industry application.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123284982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical Behaviors of Steel Strip Reinforced Flexible Pipes Under Bending","authors":"Shan Jin, Shuai Yuan, Ting Liu, Peihua Han, Yong Bai","doi":"10.1115/OMAE2018-77450","DOIUrl":"https://doi.org/10.1115/OMAE2018-77450","url":null,"abstract":"Steel strip reinforced flexible pipe (SSRFP) is a kind of unbonded composite pipe, which has more application foreground in offshore engineering due to its excellent mechanics and the considerable flexibility. In practical application, SSRFP will inevitably experience bending during reeling process and installation. In this paper, the mechanical behavior of SSRFP subjected to pure bending are studied both experimentally and numerically. A four-point bending equipment is utilized to conduct the full-scale laboratorial tests of SSRFP. Furthermore, the commercial software ABAQUS is employed to simulate its ovalization instability. The results acquired from the ABAQUS simulation are compared with the ones from verification bending experiment, which are in good coincidence with each other. The proposed model and the relative results may be of interest to the manufacture factory engineers.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123787423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of Lateral Pipe-Soil Interaction on Controlled Lateral Buckling Using Pre-Deformed Pipeline","authors":"J. Chee, A. Walker, D. White","doi":"10.1115/OMAE2018-77154","DOIUrl":"https://doi.org/10.1115/OMAE2018-77154","url":null,"abstract":"A novel approach to eliminate the onset of global buckling in pipelines is investigated in the paper. The method is based on pre-deforming a pipeline continuously with a specific wavelength and amplitude prior to installation on the seabed. The response of the pipeline to applied high temperature and pressure was studied in conjunction with variations in the lateral pipe-soil interaction (PSI) — both as uniform friction along the pipe and also with locally varying friction.\u0000 Pipe and seabed parameters representing a typical wet-insulated infield flow line on soft clay are used. The pre-deformed pipeline has a higher buckle initiation temperature compared to a straight pipeline due to the reduced effective axial force build-up resulting from the low axial stiffness generated by the pre-deformed lobes along the pipeline.\u0000 The results from this paper show that the strains in the pre-deformed pipeline are not significantly affected by the local variability of lateral PSI but rather by the global mean PSI. At a typical lateral soil resistance, i.e. a friction coefficient of 0.5, lateral buckling occurs at a very high temperature level that is not common in the subsea operation. At a very low friction, i.e. 0.1, lateral buckling occurs at a lower operating temperature but the strain is insignificant. The longitudinal strain of the pipeline is not highly sensitive to the lateral PSI, which is a quite different response to an initially straight pipeline. Therefore, this method could prove to be a valuable tool for the subsea industry as it enables the pipeline to be installed and operated safely at very high temperatures without the need for lateral buckling design and installation of expensive structures as buckle initiators.\u0000 Even if the pre-deformed pipeline buckles at a very high temperature, during cycles of heat-up and cool-down the buckle shape ‘shakes down’ by geometric rearrangement to minimize the energy, and in doing so creates a series of ‘short pipelines’ in which the longitudinal strain is self-controlled.\u0000 The system is therefore shown to be very robust in the conditions investigated and not affected by one of the biggest unknowns in seabed pipeline engineering, which is the local variability in lateral PSI.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121038735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Qualification of Sealing System for Flexible Pipes Using a Self-Energized Gasket","authors":"Christian Wang, Martin Halsteen, J. Ries","doi":"10.1115/OMAE2018-77183","DOIUrl":"https://doi.org/10.1115/OMAE2018-77183","url":null,"abstract":"In order to meet higher technical demands designing flexible pipes at higher pressures and higher temperatures for deeper water depths NOV has introduced and qualified a new sealing system that is self-energized. The sealing material has been qualified and tested in different fluids. The sealing system has shown good functionality at higher pressures as well as at lower pressures.\u0000 The qualification of the sealing system has been based on multiple full-scale and mid-scale tests according to Recommended Practice API 17B and small-scale tests on the elastomer material including long-term ageing tests and rapid gas decompression tests in high pressure CO2 up to 900 bar.\u0000 The recommendations of RP API 17B used in the industry has its limitation with regards to qualification of a new sealing system. This paper gives an overview how to qualify a new sealing system on an existing product range achieving different technology readiness levels according to Recommended Practice API 17N from TRL1 up to TRL5. TRL5 covers system integration testing by full-scale testing of flexible pipes such as burst test, tension-pressure test, tension-tension test and deep immersion performance test. All qualification tests have been witnessed by a third-party Bureau Veritas and the enhanced sealing system has archived a TRL5 statement within its current design envelope.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121337621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On Bending Performance of Additively Manufactured Steel Catenary Riser (SCR): Effect of Welding Residual Stress on Bending Strain Capacity","authors":"A. Ebrahimi, S. Kenny, M. Mohammadi","doi":"10.1115/OMAE2018-77055","DOIUrl":"https://doi.org/10.1115/OMAE2018-77055","url":null,"abstract":"Additive manufacturing (AM) also known as 3D printing is defined as a bottom-up layer on layer process of joining materials to make objects from 3D CAD models. Of particular interest in this paper is a powder bed fusion technique, namely Direct Metal Laser Sintering (DMLS) method to sinter metal powders. The advantages of metal 3D printing, e.g. high strength-to-density ratio, rapid prototyping, etc. are the motivations to employ this new disruptive technology in the marine sector, besides its current applications in medical, defense, aerospace, and automotive industries.\u0000 The current study is part of a series of collaborative work initiated by Marine Additive Manufacturing Center of Excellence (MAMCE) in which the bending strain capacity of two welded linepipes at the most critical failure point of SCR (i.e. touch-down zone) was examined. This paper comprises two main sections; in the first part a continuum finite element model was developed to simulate welding induced residual stresses and the results were calibrated with existing data in published literature; and the last part is dedicated to examination of bending strain capacity of the welded pipe. The methodology is used for two different model; a conventional stainless steel pipe; and a hybrid (i.e. Maraging steel-stainless steel) riser made using 3D metal printing technique in existence of welding induced residual stresses (i.e. section one). A comparison between the hybrid SCR model and conventional carbon steel one under similar conditions was presented providing valuable perspective over bending performance of each kind. The major outcomes of this paper are the residual stress pattern and bending moment-curvature graphs for both types of the pipe configurations, which comparatively demonstrate the significance of the type of manufacturing (AM and conventional methods), and existence of welding residual stress and internal pressure on bending behavior of SCR.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115396990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving the Installation Criterion for Concrete Coated Pipelines","authors":"Ngoc-Do Nguyen, Olav Fyrileiv, Chor Yew Chia","doi":"10.1115/OMAE2018-78512","DOIUrl":"https://doi.org/10.1115/OMAE2018-78512","url":null,"abstract":"Current design practice limits the concrete strain to approximately 0.2% in a simplified design criterion. In most standard cases, this has proved to be safe and adequate. However, in recent years, the pipeline industry is extending into more remote, harsher environments and larger diameter pipelines. The use of the simplified design criterion has, in some circumstances, resulted in too strict installation requirements which limit the number of relevant installation vessels.\u0000 This paper presents some findings on the concrete strain for submarine pipelines with concrete weight coating (CWC) derived from the numerical program performed within the scope of Phase 1 of the joint industry project “Design of concrete coating for submarine pipelines”.\u0000 Non-linearities in the concrete weight coating, anti-corrosion coating (ACC) and steel material properties, as well as large deformation and the sequence of load application were included in the numerical model. The results from the numerical analyses have been well validated against existing experimental data, and the numerical model was subsequently used in an extensive parametric study, where the behaviour of concrete coated pipelines was investigated for monotonic and reversed bending with nominal strain up to 0.4%.\u0000 These numerical results can be used to widen the applicable range of the simplified concrete crushing criterion in DNVGL-ST-F101 (2017), and to formulate a rational approach for the design of pipeline concrete weight coating under typical installation and operation conditions. The rational design approach will allow for a wider range of installation vessels to select from for installation of the pipeline, and relaxation of the installation weather window criterion.","PeriodicalId":155568,"journal":{"name":"Volume 5: Pipelines, Risers, and Subsea Systems","volume":"269 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115667179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}