The Experts below are selected from a list of 78 Experts worldwide ranked by ideXlab platform
Rebecca A Farr - One of the best experts on this subject based on the ideXlab platform.
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high frequency data observations from space shuttle main engine low pressure fuel turbopump discharge duct Flex Joint tripod failure investigation
1991Co-Authors: T F Zoladz, Rebecca A FarrAbstract:Observations made by Marshall Space Flight Center (MSFC) engineers during their participation in the Space Shuttle Main Engine (SSME) low pressure fuel turbopump discharge duct Flex Joint tripod failure investigation are summarized. New signal processing techniques used by the Component Assessment Branch and the Induced Environments Branch during the failure investigation are described in detail. Moreover, nonlinear correlations between frequently encountered anomalous frequencies found in SSME dynamic data are discussed. A recommendation is made to continue low pressure fuel (LPF) duct testing through laboratory flow simulations and MSFC-managed technology test bed SSME testing.
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data observations from space shuttle main engine low pressure fuel turbopump discharge duct Flex Joint tripod failure investigation
1991Co-Authors: T F Zoladz, Rebecca A FarrAbstract:PuDJic reoOrtlng burden for this collection of Bnforrnatlon Is estrmatecl to average 1 hour Dei* response, including the time for rewewing instructions, searching eKisting data sources,gathering and maintaining the data needed, and completing and rev,ew_ng the collection of reformation. Send comments rec_arding this burden estimate or any other a_oect of thiscollection of information, including suggestions for reducing this burden. _o ¸Washington Headquarters Services, Directorate tot Information ODeratlon$ and Repots, t215 JeffersonDaws Highway, Suite _204, Arlington, VA 22202-4302, and to the Office Of Management and Budget, Paperwork Recluc_ion Prc ;ect (0704-0188}, Washington, DC 20503.
Massimiliano Russo - One of the best experts on this subject based on the ideXlab platform.
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measured wellhead loads during drilling operations paper 1 data processing and preliminary results
ASME 2015 34th International Conference on Ocean Offshore and Arctic Engineering, 2015Co-Authors: Massimiliano Russo, Urszula Wolak, Erling Myhre, Guttorm GrytoyrAbstract:The growing size of BOPs, longer drilling campaigns on wells, and operations in harsher environments has resulted in increased challenges in properly documenting wellhead fatigue during planned or executed drilling operations. The industry has started directing its efforts toward the calibration of analytical tools which are typically adopted for predicting wellhead fatigue. The ultimate goal for achieving this ambitious scope is to identify a benchmark set of analytical results that will predict field measurements. Early on Statoil identified a major obstacle: the absence of a good and comprehensive dataset of field measurements to serve as point of reference. Statoil and Aker Solutions cooperated on a pilot project with the intent of collecting a dataset of full scale measurements during drilling operations to be used to validate and calibrate the theoretical wellhead fatigue calculation methodologies. The main objective of the instrumentation campaign was to measure sectional forces as close as possible to typical wellhead hotspots by the use of three sets of strain gauges installed on the outside surface of the conductor and on the outside of the surface casing. With the objective of collecting an exhaustive dataset of measurements, accelerometers and inclinometers were installed on the BOP, the riser adapter, the riser below the upper Flex Joint and on the rig. An additional set of six strain gauges was installed on the riser to record riser tension variations. Environmental conditions were logged on board the rig and by the hindcast data provider. Operational events were carefully logged. This paper presents the following:• Data processing used for quality assurance and calibration of the measured data and the associated data challenges• Highlights of the instrumentation system capabilities to capture salient events of a typical drilling campaign and of ad-hoc performed rig operations to calibrate and validate the measured data• Effect of a controlled rig cross motion test, performed to evaluate quasi static loads on the well and calibrate strain gauge sensor orientations• A riser pull test, performed to validate strain gauge functioning• Several landing and disconnecting of the LMRP• Manipulation of the preload between the high pressure housing and the low pressure housing to investigate the effect of the preloading on the load sharing between the casingsSince King and Soloman [2], the industry is still lacking quality field data to be used in order to validate the various analytical models used in the analyses of subsea conductor and wellheads. The results will confirm the quality of the measured data and will represent a first data point of comprehensive measured field data. This data will be used for future required work in calibrating the different building blocks pertaining to the analytical tools dedicated to well head fatigue predictions [3].Copyright © 2015 by ASME
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a simplified methodology for comparing fatigue loading on subsea wellheads
ASME 2013 32nd International Conference on Ocean Offshore and Arctic Engineering, 2013Co-Authors: Harald Holden, Pal Bjonnes, Massimiliano RussoAbstract:This paper presents a simplified way of comparing the fatigue load on different subsea wells. The simplest comparison is done by accumulating the number of days BOP has stayed connected to the wellhead. The wellhead fatigue load is however heavily dependent on the vessels used, water depth and weather while connected to the well. An equation for deriving a benchmark load factor for each operation phase for a subsea well is proposed. This benchmark load factor takes into account the water depth, metocean season of the operation, BOP height and weight, and the stiffness of the marine riser lower Flex Joint. This benchmark load factor will represent a standard number of days with a BOP connected, correcting for some known effects. The goal has been to define a measure of ‘BOP days’ that accounts for the water depth, operational season, and BOP particulars. A base case (one MODU, 100 m water depth, and all year operation), equating to one standard BOP day, has been chosen as the reference for all cases discussed.The validity of the benchmark load equation will be shown through a comparison with 31 different global riser analyses intended for wellhead fatigue. For each of the 31 data sets, time domain load analysis is done for all sea states in the wave scatter diagram. The different analyses covers different rigs, water depths and two operational phases (with or without subsea XT installed). To enable a large scale comparison of the bench mark factor, an approach where the fatigue load is summarized using the bending moment standard deviation on the wellhead datum is presented. This methodology is then compared to four full fatigue calculations using a typical subsea wellhead fatigue capacity. Then the simplified fatigue calculation is performed for all 31 global riser analyses. The calculated damage is then compared with the corresponding bench mark formula in each case.Finally it is shown how this benchmark load formula has been implemented into the Statoil WellSpot database as a fatigue load criticality screening tool for the different Statoil subsea wells. It is further shown how this can be used as a tool during planning of future operations, and how to prioritize wells where a detailed fatigue analysis is recommended.Copyright © 2013 by ASME
T F Zoladz - One of the best experts on this subject based on the ideXlab platform.
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high frequency data observations from space shuttle main engine low pressure fuel turbopump discharge duct Flex Joint tripod failure investigation
1991Co-Authors: T F Zoladz, Rebecca A FarrAbstract:Observations made by Marshall Space Flight Center (MSFC) engineers during their participation in the Space Shuttle Main Engine (SSME) low pressure fuel turbopump discharge duct Flex Joint tripod failure investigation are summarized. New signal processing techniques used by the Component Assessment Branch and the Induced Environments Branch during the failure investigation are described in detail. Moreover, nonlinear correlations between frequently encountered anomalous frequencies found in SSME dynamic data are discussed. A recommendation is made to continue low pressure fuel (LPF) duct testing through laboratory flow simulations and MSFC-managed technology test bed SSME testing.
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data observations from space shuttle main engine low pressure fuel turbopump discharge duct Flex Joint tripod failure investigation
1991Co-Authors: T F Zoladz, Rebecca A FarrAbstract:PuDJic reoOrtlng burden for this collection of Bnforrnatlon Is estrmatecl to average 1 hour Dei* response, including the time for rewewing instructions, searching eKisting data sources,gathering and maintaining the data needed, and completing and rev,ew_ng the collection of reformation. Send comments rec_arding this burden estimate or any other a_oect of thiscollection of information, including suggestions for reducing this burden. _o ¸Washington Headquarters Services, Directorate tot Information ODeratlon$ and Repots, t215 JeffersonDaws Highway, Suite _204, Arlington, VA 22202-4302, and to the Office Of Management and Budget, Paperwork Recluc_ion Prc ;ect (0704-0188}, Washington, DC 20503.
Hugh Thompson - One of the best experts on this subject based on the ideXlab platform.
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Sleeved Stress Joint for Steel Catenary Riser Application
29th International Conference on Ocean Offshore and Arctic Engineering: Volume 5 Parts A and B, 2010Co-Authors: S.-h. Mark Chang, Sunil Kuriakose, Paul Stanton, Hugh ThompsonAbstract:Steel catenary risers (SCRs) have been widely used for oil/gas/water transport on floating platforms for the last fifteen years. Flex Joints and tapered stress Joints are often used for interface between the SCR and platform. Flex Joints and tapered stress Joints need to be designed to meet both the stiffness and Flexibility requirements. A stress Joint requires high stiffness to withstand the bending moment induced by the SCR and at the same time needs to be sufficiently Flexible so as not to overstress the SCR. To achieve these complex requirements, a sleeved stress Joint (SSJ) provides a sound technical and economical alternative for the interface between the SCR and platform. A sleeved stress Joint utilizes multiple pipes to provide variable stiffness and to meet the strength and Flexibility requirements. In the design of a SSJ, the number of sleeves, and the outer diameters and wall thicknesses of the sleeved pipes can be adjusted to achieve the design requirements. In addition, the locations of welds in the sleeved pipes can be placed to achieve the high fatigue performance that is important in stress Joint design. Feasibility of the SSJ design is verified through state-of-the-art computer modeling. Generic cases of SSJ design applied to the porch and pull tube of a floating platform are presented. The design concept is compared with traditional Flex Joint and tapered stress Joint designs. The technical and economic advantages of such a design are discussed. © 2010 by ASME.
Dara Williams - One of the best experts on this subject based on the ideXlab platform.
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the influence of drilling rig and riser system selection on wellhead fatigue loading
ASME 2012 31st International Conference on Ocean Offshore and Arctic Engineering, 2012Co-Authors: John Greene, Dara WilliamsAbstract:With drilling and exploration activity currently high in both deep and shallow water regions rig availability and selection is an issue for operators to consider in order to achieve the desired exploration schedule. At present the industry focus is on the development of 6th generation drilling rigs with the capacity to operate in increasing deep water. However despite the focus on deepwater exploration and the associated demand for deepwater drilling rigs there still exists demand for drilling rigs that can operate in shallow to moderate water depths (100m–500m). In addition, certain field development scenarios may exist where planned water depths for drilling activities vary significantly and therefore a drilling rig and riser system is required that can operate satisfactorily in both shallow and deep water depths.For a given drill site, rig availability or well location, may be such that an operator may have to select a modern deepwater 6th generation rig for shallow water activities where a 3rd generation rig would appear to provide a better solution. Other considerations such as vessel station keeping requirements may lead to selection of a 6th generation rig over a 3rd generation rig, as the former tend to have improved DP thrusters capacity. However it is also important to note that while the 6th generation rigs may have been proven to be robust systems for operation in deep water, the response of a 6th generation drilling system in shallow water depths can be very different to that of an older 3rd generation rig and drilling riser system. Thus careful consideration must be made by the operator when considering the selection of drilling vessels for shallow to moderate water depths. Fatigue life of the wellhead is shown to be affected when one compares the response of the 6th generation and 3rd generation drilling systems in shallow to moderate depths. This also needs to be accounted for when selecting rigs for workover or intervention operations on older infrastructure.This paper presents a discussion on the various parameters such as BOP stack size, riser, Flex Joint and vessel design that influence the response of the drilling system in shallow to moderate water depths (100m–500m). A number of case studies and parametric studies have been carried out and the results of these are presented in order to compare the wellhead fatigue damage from the older 3rd generation systems with the 6thgeneration systems and also to identify the critical drivers for this fatigue life reduction.Copyright © 2012 by ASME