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会议名称:

Corrosion conference and expo

召开年:

2017

召开地:

New Orleans

会议文集:

Corrosion conference and expo 2017: Corrosion conference and expo 2017, 26-30 March 2017, New Orleans, Louisiana, USA

主办单位:

NACE International

出版时间:

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  • 题名 作者 来源 发表时间 操作
  • Internal Corrosion Asset Preservation Methodology Case Study

    作者:Joe Pikas;David Richardson; 会议名称:Corrosion conference and expo 2018年

    This paper will provide the understanding for the preservation of assets from the effects of internal corrosion. A pre-screening for the mitigation of internal pipeline leaks at upstream and mid-stream pipeline facilities takes in consideration the internal safety aspects because of past leaks, elevation changes where liquids tend to collect in low spots or traps. The primary goal in the screening process of large piping networks is to determine if corrosive environments exist while using a minimal amount of data to mitigate these leak risks to maintain production without reduction. Let's take a case with a network of approximately 1,000 gas production wells/pipelines in this study. Criteria were developed for mitigation and risk reduction strategies that includes inhibition, cleaning pigs, in-line-inspection (ILI) and repair. In addition, minimal time/information was required to apply the criteria utilizing a pattern recognition methodology conducted by an experienced corrosion engineer. Once the pipelines of concern were identified as a threat (approximately 16%), the study then utilizes a multi-phase hydraulic simulator that integrates corrosion analysis from a comprehensive set of models to predict, identify and assess the location of highest likely risk and damage. The remaining 84% did not need any additional assessments using hydraulic simulation. Key performance indicators (KPIs) were used to determine detrimental flow conditions. These indicators include predicted corrosion rates (influenced by total dissolved solids (TDS), flow regime, microbial induced corrosion, organic acids, temperature, glycol, etc.), remaining pipe life, water accumulation, etc.).

    关键字:Internal Corrosion; Pre-screening; Risk Assessment; Threats; Mitigation; Management Preservation of Assets

  • Internal Corrosion Asset Preservation Methodology Case Study

    Joe Pikas;David Richardson;

    Corrosion conference and expo

    2018年

  • Evaluation of Offshore Coating Systems on Pitted Stainless Steels

    作者:Thu Tran Addis;Andy Bodington;Carmen Fonseca;Benjamin T.A. Chang; 会议名称:Corrosion conference and expo 2018年

    External pitting corrosion is a serious concern for offshore stainless steel vessels, tanks and piping. Protective coating is an economic option to mitigate the pitting corrosion of offshore stainless steels. However, in the literature, there is a lack of publications on the selection of proper coating systems on pitted stainless steels to minimize pitting growth and prevent new pitting formation. The objective of this study was to 1) develop a test protocol to test coating performance on pitted stainless steel 2) compare the performance of protective coating systems on various surface preparations, 3) determine a proper coating application procedure to cover the pits, to improve the integrity of offshore pitted stainless steels. The following lab tests were performed to determine the performance of various coating systems: 1) adhesion test, 2) water vapor permeation, 3) underfilm corrosion, and 4) holiday-free film formation. As a result of this work, protective coating systems and the application method for the pitted offshore stainless steel facilities were identified. The most critical issues for the selection of coating systems for offshore pitted stainless steels are to have a good adhesion durability and low water permeation. The primer must be applied with brush to fill the pits and the rest of coats can be applied by spray.

    关键字:coating; stainless steel; pitting corrosion; permeability; adhesion; underfilm corrosion

  • Evaluation of Offshore Coating Systems on Pitted Stainless Steels

    Thu Tran Addis;Andy Bodington;Carmen Fonseca;Benjamin T.A. Chang;

    Corrosion conference and expo

    2018年

  • The Water pH and Gas Evolution Risks Associated with the Use of Aluminium and Zinc Anodes for the Internal Cathodic Protection of Offshore Monopiles

    作者:Alex Delwiche;Patrick Lydon; 会议名称:Corrosion conference and expo 2018年

    In 2012, a cathodic protection (CP) trial was undertaken to establish the current requirements to protect the submerged and buried bare steel internal surfaces of monopiled windturbine structures in the North Sea. Aluminium alloy anodes were utilized for the CP trial system and a remote monitoring system was also installed to measure the time dependent variations in anode current, structure to seawater potential, cathode current density and monopile hydrogen gas concentration produced from operation of the CP system. Within a few weeks of the trial commencing, the seawater pH inside the monopile, had changed from near neutral pH 8 to less than pH 5 and when access to the confined spaces within the monopiles was attempted toxic gas alarms were energised. Several papers have been written discussing the strategy and the reasons why the pH reduced. This paper discusses the reasons why different gases were produced and explains why the water pH changes were greater using Aluminium anodes than with Zinc anodes in situations where there is limited water replenishment and essentially stagnant water conditions exist.

    关键字:Monopiles; Aluminium; Zinc; Hydrolysis; Anodes; Hydrogen Sulphide; pH

  • The Water pH and Gas Evolution Risks Associated with the Use of Aluminium and Zinc Anodes for the Internal Cathodic Protection of Offshore Monopiles

    Alex Delwiche;Patrick Lydon;

    Corrosion conference and expo

    2018年

  • Effect of Modeling Variables upon Projection of Corrosion Induced Bridge Post-Tension Tendon Failures

    作者:William H. Hartt; 会议名称:Corrosion conference and expo 2018年

    Post-tensioning (PT) has become an important technology for affecting integrity of large reinforced concrete structures, including bridges. While there are a number of advantages to PT construction compared to conventional reinforcement, corrosion caused tendon failures have recently been reported, in some cases within but a few years of construction, as a consequence of either chemically or physically deficient grout (or a combination of the two), where the former involves elevated concentration of chlorides or free sulfates (or both) and the latter voids with free water, and soft, chalky, segregated, separated grout. In response to this, a methodology has been developed whereby timing of an initial wire and strand fractures and tendon failure can be projected and then rate of subsequent fractures/failures, given information regarding wire corrosion statistics; and a degree of verification was provided based upon results from mockup tendon exposures and forensic analyses of a failed bridge tendon. The present paper reports results of analyses that address the influence of physical and modeling variables upon failure projections. These include the following: 1. Analysis variables (generation of random numbers) 2. Strand/tendon stress, 3. Wire/strand strength, 4. Number of tendons, and 5. Tendon length. The significance of each is discussed and results are related to the timing of tendon failures on bridge structures.

    关键字:Post-tensioning; corrosion; bridges; grout; deficiencies; fracture; failure

  • Effect of Modeling Variables upon Projection of Corrosion Induced Bridge Post-Tension Tendon Failures

    William H. Hartt;

    Corrosion conference and expo

    2018年

  • Recent Applications of Evaluations of Equipment in HTHA Service

    作者:M. Nugent;T. Silfies;P. Kowalski;N. Sutton; 会议名称:Corrosion conference and expo 2018年

    In the past 5 years, Conventional Non-Destructive Examination (NDE) for High-Temperature Hydrogen Attack (HTHA) has been improved with remarkable success. This technology, combined with emerging Fitness-for-Service (FFS) methodologies, has been used in the evaluation of equipment in HTHA service with a higher level of confidence. Some of these evaluations have led to a systematic approach to continued operation, limited service, or retirement decisions not possible just 5 years ago. This paper will highlight some of the ongoing advances of the HTHA Joint Industry Project (JIP) to date and provide a preview into upcoming developments in the NDE and FFS codes. Some case studies will be presented along with recent advances in laboratory methods for HTHA prediction.

    关键字:High-Temperature Hydrogen Attack; HTHA; Nelson Curve; Carbon Steel; C-0.5Mo; API RP 941; decarburization; NDT; NDE; non-destructive examination

  • Recent Applications of Evaluations of Equipment in HTHA Service

    M. Nugent;T. Silfies;P. Kowalski;N. Sutton;

    Corrosion conference and expo

    2018年

  • Investigation of the Impact of an Enhanced Oil Recovery Polymer on Microbial Growth and MIC

    作者:Ru Jia;Dongqing Yang;Hasrizal Bin Abd Rahman;Tingyue Gu; 会议名称:Corrosion conference and expo 2018年

    In the oil and gas industry, water flooding, often with a polymer additive, is used in enhanced oil recovery (EOR) to increase reservoir pressure because reservoirs are aging. This practice causes operational concerns because water flooding brings nutrients and microbes downhole, which may allow microbes to flourish. Polymers such as carboxymethyl cellulose sodium are used in EOR to increase the viscosity of the injection water. However, there is a possibility that EOR polymers may be utilized as a carbon source by microbes downhole causing reservoir souring and microbiologically influenced corrosion (MIC). In this work, carboxymethyl cellulose sodium (3,000 ppm by mass) was found to be utilized by an oilfield biofilm consortium containing various microbes including sulfate reducing bacteria (SRB) and biodegradation microbes during a 30-day anaerobic incubation test at 37℃. The polymer utilization increased the planktonic cell count and SRB sessile cell count in anaerobic vials with 100 ml artificial seawater. After the 30-day incubation, the polymer utilization led to 16% viscosity loss. The utilization also slightly increased weight loss and pitting corrosion on C1018 carbon steel.

    关键字:microbiologically influenced corrosion; biofilm; enhanced oil recovery; reservoir; polymer; biodegradation

  • Investigation of the Impact of an Enhanced Oil Recovery Polymer on Microbial Growth and MIC

    Ru Jia;Dongqing Yang;Hasrizal Bin Abd Rahman;Tingyue Gu;

    Corrosion conference and expo

    2018年

  • A Computational Approach to Evaluate the Sensitization Propensities of UNS S32100 and UNS S34700 Stainless Steels

    作者:Raghavan Ayerk;Yunjo Ro;Inno Park;Jaehyeok Shim;Jingak Nam;Jaewoong Kim; 会议名称:Corrosion conference and expo 2018年

    A computational approach based on thermodynamic and kinetic calculations (using commercial software) to assess the sensitization propensities of titanium and niobium stabilized stainless steels (UNS S32100 and UNS S34700, respectively) was investigated. The thermodynamic part consisted of calculating the carbon and nitrogen solubilities in austenite in the stabilized steels and comparing them to the corresponding solubilities in the unstabilized grades to determine the effectiveness of the stabilizing elements in decreasing carbon supersaturation at the service temperature. The kinetic part of the analysis consisted of determining the precipitation rate of carbides and carbo-nitrides during extended service. In addition, detailed microstructural studies were performed on selected steels exposed to service to validate some of the computational results. The study revealed the critical role of nitrogen in these steels with respect to sensitization and how its role differs between the two steels. Quantitative insights from the study provide guidance to fine-tune existing ASTM composition specifications and defining of optimum steel chemistry window for improved resistance to sensitization. With future calibration studies with field samples, the calculations may also be effectively used to predict the sensitization potential of components in service based on the alloy chemistry and heat treatments prior to service.

    关键字:Stress Corrosion Cracking; SCC; UNS S32100~((1)); UNS S34700; Thermocalc™; Matcalc™; precipitation; carbides; nitrogen; PEELS

  • A Computational Approach to Evaluate the Sensitization Propensities of UNS S32100 and UNS S34700 Stainless Steels

    Raghavan Ayerk;Yunjo Ro;Inno Park;Jaehyeok Shim;Jingak Nam;Jaewoong Kim;

    Corrosion conference and expo

    2018年

  • A Comparison of Chemistries Intended to Treat Reservoir Souring

    作者:Alicia M. Jones;Brett Geissler;Renato De Paula; 会议名称:Corrosion conference and expo 2018年

    The presence of hydrogen sulfide (H2S) in a reservoir poses a major threat to oilfield asset integrity and oil and gas production. In addition to contributing to corrosion, H2S is extremely toxic and devalues produced fluids and gases. Not managing the consequences of a sour reservoir can eventually lead to costly well shut-ins and lost production time. While H2S can be formed through natural chemical reactions, a varied population of microorganisms capable of metabolizing an array of sulfur compounds is responsible for the biotic production of H2S. Current chemical treatment options for remediation of biotic reservoir souring include targeting microbial populations with a biocide or using calcium nitrate to selectively grow microorganisms that metabolize nitrate instead of sulfur compounds. We have recently identified a number of novel compounds that have been proven successful in the laboratory to prevent H2S production by directly targeting the sulfate-reducing population. In this study, we compare these novel compounds to chemistries currently employed to prevent sulfidogenesis, and we introduce an increased-throughput screening method to evaluate sulfide inhibition. Since the novel compounds consistently performed well in synthetic brine compared to other commonly used chemistries, we also provide results detailing the efficacy of these novel compounds in a variety of other conditions as well. These findings further expand our understanding of the existing and potential treatment strategies intended to combat the deleterious effects of biotic reservoir souring.

    关键字:sulfate-reducing bacteria; hydrogen sulfide; reservoir souring; calcium nitrate; biocide

  • A Comparison of Chemistries Intended to Treat Reservoir Souring

    Alicia M. Jones;Brett Geissler;Renato De Paula;

    Corrosion conference and expo

    2018年

  • Corrosion Resistance of Roll-Bonded Clad Plates for Oil & Gas Applications

    作者:Sandra Le Manchet;Bastien Chareyre;Cedric Chauvy;Sarata Cisse; 会议名称:Corrosion conference and expo 2018年

    The nickel-based alloys UNS N06625 and N08825 are today commonly used in the Oil & Gas industry for piping or pressure vessels applications. The material selection is mainly driven by the corrosivity of the environment in terms of chloride concentration, temperature, pH and H_2S partial pressure. For these applications, several mechanical characteristics are generally required. Clad plates represent therefore a cost-effective solution, combining the corrosion resistance of a nickel alloy layer (thickness around 3 mm -1/8 inch) to the mechanical properties of a carbon-steel backer material. This paper will be dedicated to the corrosion resistance of roll-bonded UNS N06625 and N08825 clad materials. Special attention will be paid to their resistance to stress corrosion cracking which is the primary cracking mechanism that shall be considered for nickel alloys as per NACE MR 0175 / ISO 15156 part 3. Results regarding their pitting corrosion and intergranular corrosion resistance will also be provided.

    关键字:UNS N08825; UNS N06625; roll-bonded cladding; PWHT; sensitization; standard corrosion tests; stress corrosion cracking

  • Corrosion Resistance of Roll-Bonded Clad Plates for Oil & Gas Applications

    Sandra Le Manchet;Bastien Chareyre;Cedric Chauvy;Sarata Cisse;

    Corrosion conference and expo

    2018年

  • On the Predictability of CO_2 Pitting Corrosion in Multiphase Gas Pipelines-an Upstream Case Study

    作者:Hamed Mansoori;Reza Mirzaee; 会议名称:Corrosion conference and expo 2018年

    Multiphase transportation of wet natural gas from production wells to treatment facilities exposes pipeline to corrosion risks. Among all types of corrosion attacks, pitting corrosion is the most common cause of failures in gas pipelines. Stochastic nature of pit initiation and growth cast uncertainty on CO_2 pitting corrosion prediction. This paper discusses how precipitation of scales and corrosion products on the pipe surface along with other influencing factors contributed to the initiation of pits and finally failure of a wet gas pipeline in a sweet gas field, south of Iran. The technical analysis provided in this study is helpful for further understanding of pitting corrosion in wet gas pipelines.

    关键字:CO_2 pitting corrosion; Multiphase gas pipeline; Corrosion inhibitor; Corrosion product; API 5L X65; Scale

  • On the Predictability of CO_2 Pitting Corrosion in Multiphase Gas Pipelines-an Upstream Case Study

    Hamed Mansoori;Reza Mirzaee;

    Corrosion conference and expo

    2018年

  • Inspection, Monitoring, Model: Past, Present, Future

    作者:Sankara Papavinasam; 会议名称:Corrosion conference and expo 2018年

    The title of the paper denotes two attributes: Attribute #1: 1. "Inspection" reveals "past" events, i.e., inspection technologies determine the corrosion rate "after" corrosion had caused loss of material 2. "Monitoring" reveals "Present" situation, i.e., monitoring techniques determine the corrosion rate at the time of monitoring 3. "Model" predicts the "future" situation, i.e., modeling predicts the "futuristic" corrosion rate based on system operating conditions. Attribute #2: 1. The paper discusses "past" developments, "present" status, and "future" advancements of inspection, monitoring, and modelling technologies. The main objective of the paper is on Attribute #2. 1. In the past, the number of internal corrosion related incidences was more than 3 per 1,000 kilometers (km) of pipelines per year 2. In the present, the number of internal corrosion related incidences hovers around 0.5 per 1,000 KMs of pipelines per year 3. In the future, the industry's goal is to bring the number of incidences to "ZERO". This paper explains "effective" and "economical" actions that are required to achieve the "ZERO" incidence goal and the roles of inspection, monitoring, and modeling activities in achieving the goal.

    关键字:5-M methodology; Corrosion control; corrosion management; integrity management; asset integrity management; pipeline integrity management; inspection; monitoring; model

  • Inspection, Monitoring, Model: Past, Present, Future

    Sankara Papavinasam;

    Corrosion conference and expo

    2018年

  • Galvanic Corrosion Risk Assessment of Bolt Materials in Contact with ASTM A1010 Steel Bridges

    作者:Nafiseh Ebrahimi;Jieying Zhang;Bruce Baldock;David Lai; 会议名称:Corrosion conference and expo 2018年

    This study has evaluated the galvanic coupling corrosion risk between connection bolt materials with ASTM A1010 structural steel, which has recently emerged for the construction of more corrosion-resistant bridges than weathering steel bridges. Use of A1010 steels containing 10.5% Cr is intended to extend the service life of steel bridges without frequent maintenance requirements caused by corrosion, particularly in regions under severe chloride exposures such as due to heavy use of de-icing salts and in marine environments. The greater corrosion resistance of A1010 steel with a more positive corrosion potential does, however, impose a risk of galvanic corrosion with the connection bolts in direct electrical contact. Here, the galvanic corrosion between A1010 steel and galvanized ASTM A325 Type I bolt was compared to that between weathering steel and galvanized ASTM A325 Type I bolt, as well as that between A1010 steel and ASTM A320 B8 class 2 and A193 B6 stainless steel bolts. A comprehensive experimental investigation measured galvanic coupling current and potential for samples in cells of aerated salt solution, and the galvanic corrosion risk ranking was validated by visual examinations of bolted steel plates exposed to a salt spray testing chamber. The galvanic corrosion risk of using B8 class 2 bolts with A1010 steel was found to be much lower than using galvanized A325 bolts, but B6 bolt material itself experienced severe crevice and pitting corrosion in both simulated salt solution and salt spray testing.

    关键字:Galvanic coupling corrosion; bridges; ASTM A1010 steel; A325 galvanized bolts; stainless steel bolts

  • Galvanic Corrosion Risk Assessment of Bolt Materials in Contact with ASTM A1010 Steel Bridges

    Nafiseh Ebrahimi;Jieying Zhang;Bruce Baldock;David Lai;

    Corrosion conference and expo

    2018年

  • Applying Higher C-Values in API RP 14E Erosion Velocity Calculations for Gas Condensate Wells - A Case Study

    作者:Harned Mansoori; 会议名称:Corrosion conference and expo 2018年

    This paper presents the results of an Iranian Operator's successful trials on enhancing gas well threshold velocity beyond those recommended by API RP 14E. The API RP standard proposes recommendations on limiting velocity in tubing and pipelines to avoid or mitigate damage associated with erosion and/or corrosion. In this Standard, an empirical formula is used to estimate the threshold (erosion) velocity, beyond which damage would be expected to pipeline networks. In the current work, an oil operator launched field trials for a safe increase in the threshold velocity of its gas condensate wells. For those wells whose current production potentials were higher than anticipated, the recommendations in API RP 14E on erosion velocity limits were a considerable obstacle to increased production rates. For a certain period of time, the selected wells were produced at a higher rate and then the tubing and topside facilities were examined carefully using a combination of surface and downhole erosion/corrosion monitoring tools. New higher values for the C-factor in the API RP 14E erosion velocity calculation were achieved for selected wells and for the future development of the studied field. This work demonstrated the use of the new C-values in the API RP erosion velocity calculation and their verification by evaluation of field data.

    关键字:API RP 14E; erosion velocity; production tubing; corrosion; gas well

  • Applying Higher C-Values in API RP 14E Erosion Velocity Calculations for Gas Condensate Wells - A Case Study

    Harned Mansoori;

    Corrosion conference and expo

    2018年

  • The Development of Corrosion Monitoring for Maintenance Management in Petrochemical Plants

    作者:Takao Ohtsu;Masazumi Miyazawa; 会议名称:Corrosion conference and expo 2018年

    Petrochemical process plant construction materials deteriorate when the plant is in service. In consequence, planned maintenance is undertaken to repair and replace equipment when it is predicted or detected that the facility has sustained damage. Typically, the operating environment does not normally vary very much. However, from time to time, process conditions may change rapidly and unexpectedly, due to contamination by water or other impurities, which can result in severe and widespread damage to the materials of construction. One such example concerned a process plant operated by our company. In this instance, damage to a process heat exchanger could result in moisture ingress that, in combination with an anhydrous hydrocarbon process stream that contained hydrogen chloride, produced a highly corrosive downstream environment, due to ionization of the HCl, even though the bulk liquor stream was relatively non-conductive. The low conductivity of the bulk environment meant that conventional process and corrosion monitoring instrumentation was unsuitable to detect the onset of the fault condition or provide an indication of the likely corrosion rate. In consequence, it was desirable for corrosion combination of monitoring techniques to be developed that could detect changes in the service environment in real time in order to reduce the severity and duration of such attack. This paper describes the development of the monitoring approach, and in particular on the application of electrochemical noise analysis, which, in combination with certain process chemistry parameters, could be used to detect the onset of the fault condition and prompt timely remedial action in such complex and/or low conductivity hydrocarbon processing systems.

    关键字:petrochemical plant; corrosion; monitoring; low conductivity hydrocarbon streams; electrochemical noise

  • The Development of Corrosion Monitoring for Maintenance Management in Petrochemical Plants

    Takao Ohtsu;Masazumi Miyazawa;

    Corrosion conference and expo

    2018年

  • Electrochemical Behavior of UNS N08031 in Green-Death Solution

    作者:Jun-Seob Lee;Joerg Radnik;Ralph Baessler; 会议名称:Corrosion conference and expo 2018年

    The electrochemical behavior of UNS1~((1)) N08031 was investigated as a function of electrode potential in Green-Death~((2)) solution at 40℃. The UNS N08031 surface is in a stable passive state during cyclic potentiodynamic polarization without an initiation and/or propagation of localized corrosion. In potentiostatic polarization of UNS N08031 for 3600 s, passive current density increases with an increase in the passivation potential from 0.7 to 1.0 V_(SSE) (Silver/silver chloride reference electrode in saturated potassium chloride) Electrochemical impedance spectroscopy (EIS) and Mott-Schottky (M-S) analysis showed that a more defective n-type semiconductive passive film forms as the potential increases. X-ray photoelectron spectroscopy (XPS) revealed that passive film consists of mainly chromium and minor iron and nickel oxides. The mechanism of the defective passive film formation is discussed. The increase of the applied potential is considered to be a reason for the change in passive film stability.

    关键字:Steel; Passive film; X-ray photoelectron spectroscopy

  • Electrochemical Behavior of UNS N08031 in Green-Death Solution

    Jun-Seob Lee;Joerg Radnik;Ralph Baessler;

    Corrosion conference and expo

    2018年

  • Study on Ferrite Measurement Methods for Duplex Stainless Steel Welds

    作者:Nozomi Satake;Mikihiro Sakata;Tomoaki Kiso;Toshiaki Okabe; 会议名称:Corrosion conference and expo 2018年

    When duplex stainless steel (DSS) is applied to welded components, ferrite measurement with manual point count according to ASTM~((1)) E562 is often used during welding procedure qualification as heat affected zone (HAZ) of the weld tends to have high ferrite content. For this measurement method, there are several testing variables and it seems that standard testing variables are not used for ferrite measurements performed by various fabricators. In this paper, the effects of three major variables described in ASTM E562, which were the grid size i.e. number of testing points in a grid, number of fields and measurement locations, on the measured ferrite contents were studied. Also, ferrite measurement with automatic image analysis according to ASTM E1245 was performed across the fusion line of the weld to compare the ferrite content measured by manual point count according to ASTM E562. In addition to the ferrite measurement, pitting corrosion test according to ASTM G48, Method A was performed on the same sample as the one used for ferrite measurement in order to see where in the weld pitting corrosion occurs. The results have suggested a necessity of establishment of standardized testing variables to be used for ferrite measurement with manual point count according to ASTM E562.

    关键字:Duplex Stainless Steel; Welding; Ferrite Content; Point Count; ASTM E562; Image Analysis

  • Study on Ferrite Measurement Methods for Duplex Stainless Steel Welds

    Nozomi Satake;Mikihiro Sakata;Tomoaki Kiso;Toshiaki Okabe;

    Corrosion conference and expo

    2018年

  • Wear Modeling of Dense Slurry Flow in Oil Sands Coarse Tailings (CT) Pipelines

    作者:Guoqiang Yang;Duane Serate;Kuochen Tsai;Mingqi Wu; 会议名称:Corrosion conference and expo 2018年

    Dense slurry flow is a feature of the oil sands operation. Modelling of erosion in dense slurry flow under oil sands process conditions is challenging. Although several erosion models are currently used for upstream produced sand application under very dilute sand conditions, extension of those models to dense slurry flow such as conditions relevant to oil sands is highly uncertain. The objective of this study is to develop predictive wear model for dense slurry flow to narrow the gap. An integrated approach was developed to model the wear in oil sands Coarse Tailings (CT) slurry pipeline. Three techniques, including pilot-scale flow loop experiments, computational fluid dynamics (CFD) simulations and field trial, were jointly used to aid the development of a reliable predictive tool. By collaborating with vendors, a high-resolution, non-intrusive, erosion monitoring system based on ultrasonic technology (UT) was developed and implemented in the flow loop experiments. A data mining analysis based on random forest algorithm was applied to the field trial data to develop a predictive wear model for CT pipelines. Both the Eulerian-Granular and Eulerian-Lagrangian methods were explored in CFD simulations for dense slurry flow in long and large horizontal pipes. The CFD erosion model was calibrated based on the field trial data and validated by the flow loop tests. The effects of critical variables affecting the wear were investigated, and a predictive tool was developed. The modelling tool is capable of predicting erosion rates due to changes in the piping design and operating conditions. The model can help the operator adjust process conditions to minimize wear and optimize inspection and maintenance schedule. This paper summarizes the findings from the various techniques adopted in this study and their limitations.

    关键字:wear modelling; oil sands; dense slurry flow; erosion; CFD simulation; data mining analysis

  • Wear Modeling of Dense Slurry Flow in Oil Sands Coarse Tailings (CT) Pipelines

    Guoqiang Yang;Duane Serate;Kuochen Tsai;Mingqi Wu;

    Corrosion conference and expo

    2018年

  • Corrosion Performance of Cold Sprayed Tantalum Coatings

    作者:Shiladitya Paul;Phil McNutt; 会议名称:Corrosion conference and expo 2018年

    Tantalum (Ta) is known for its inertness, particularly for its resistance to corrosion by most mineral acids, except hydrofluoric acid or acidic solutions containing F~- and SO_3. Despite its high corrosion resistance, the use of Ta is limited to specialized applications, due to the high material cost. The industrial uptake of Ta can be increased if a dense Ta coating could be achieved by an economical coating production method. To that end, cold spray (or cold gas dynamic spray) offers a possible solution. To test the suitability of cold sprayed Ta to mitigate the corrosion of underlying carbon steel substrate in simulated industrial environments, exposure tests were carried out. Ta coatings were cold sprayed onto carbon steel substrates and exposed to two different solutions: (ⅰ) synthetic seawater and (ⅱ) aqueous 15% HCl. After completion of the tests visual examination was carried out. Visual examination revealed that cold sprayed Ta coating is capable of mitigating corrosion of carbon steel in synthetic seawater and 15% HCl environments only when fully dense. Care must be taken to ensure full coverage of the substrate to mitigate galvanic corrosion.

    关键字:cold spray; tantalum coatings; porosity; corrosion rate; electrochemical measurements

  • Corrosion Performance of Cold Sprayed Tantalum Coatings

    Shiladitya Paul;Phil McNutt;

    Corrosion conference and expo

    2018年

  • CATHODIC PROTECTION INTERFERENCE - INTERFERENCE TESTING AND MITIGATION OF INTERFERENCE ISSUES

    作者:Jeffrey L. Didas; 会议名称:Corrosion conference and expo 2018年

    This paper will discuss CP Interference and CP Influence and how the two differ. CP Interference will be shown with some interference testing case histories and the CP Influence will also be shown with a case history. The two topics Interference vs. Influence will be addressed and some solutions presented.

    关键字:CP Interference; CP Influence; Static Interference

  • CATHODIC PROTECTION INTERFERENCE - INTERFERENCE TESTING AND MITIGATION OF INTERFERENCE ISSUES

    Jeffrey L. Didas;

    Corrosion conference and expo

    2018年

  • Analysis of Hydrogen Induced Cracking by in-situ HIC observation method

    作者:Taishi Fujishiro;Takuya Hara; 会议名称:Corrosion conference and expo 2018年

    Hydrogen Induced Cracking (HIC) is one of the major issues of line pipes exposed to sour environments. There are some guidelines on materials requirements for carbon and low alloy steels for H_2S-containing environments in oil and gas production. Generally, HIC susceptibility is evaluated after the test duration, typically 96 hours, in accordance with NACE TM0284-2016. However, HIC propagation behavior during HIC test has not been fully understood. In this study, a new in-situ HIC measurement method has been developed in order to make the connection between HIC propagation behavior and microstructure. This technique is based on the combination of an automatic ultrasonic wave inspection system and a scanning electron microscopy (SEM) observation. HIC propagation rate and HIC propagation behavior of carbon steels with different texture were investigated, using this in-situ technique. Texture components of tested steels were changed by controlled rolling process in the alpha-gamma dual phase region. {100} intensity parallel to the rolling plane was developed with increasing controlled rolling reduction in the alpha-gamma dual phase region. HIC propagation rate increased and crack length of HIC grew in a staircase pattern with time when the {100} texture was highly developed. In addition, HIC propagation behavior could be overlapped with fracture surface, just like a projection mapping. The overlapping could make the connection between HIC propagation behavior and HIC fracture surface. Microstructure and texture just under the HIC fracture surface was also characterized by SEM and an electron backscatter diffraction pattern (EBSP) method. The results obtained in this study showed that HIC propagation behavior was affected by a texture. In addition, the new in-situ HIC observation technique, which can make the direct connection between HIC propagation behavior and microstructure, revealed a detailed HIC propagation behavior and an effect of microstructure.

    关键字:HIC; Propagation; Texture; line pipe

  • Analysis of Hydrogen Induced Cracking by in-situ HIC observation method

    Taishi Fujishiro;Takuya Hara;

    Corrosion conference and expo

    2018年

服务协议

服务协议


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