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Monitoring Technology For Integrity Management Of The Hull Structure Of Floating Production, Storage And Offloading (Fpso) Vessel
Authors: Shan Guan; Graeme Ripley
The FPSO vessel is prone to corrosion and corrosion-induced structural degradation because of the saline marine environment and continuous loading/offloading operation. To assure the structural integrity and safe operation, they must be inspected periodically, and ideally continuously monitored. 16 types of sensing technologies were identified for monitoring of FPSO Vessel.
Authors: A. Herrera, A. Forero, R. P. Silva, S. Bott
In the pre-salt fields, in Brazil, oil recovery has been increased by re-injecting carbon dioxide extracted from the wells. Deeper oil/gas reservoirs contain large quantities of CO2 and, therefore, CO2 corrosion is an up to date issue and as such newer attempts are been made to study the mechanisms of the C02 corrosion.
Nacl-Induced Atmospheric Corrosion Of Two Mgal Alloys In Semi-Solid Cast And Diecast States - Influence Of Microstructure And Co2
Authors: M. Shahabi-Navid, M. Esmaily, Y. Cao, L.-G. Johansson, J.-E. Svensson
The atmospheric corrosion of MgAl alloys AM50 and AZ91 was studied in the laboratory at constant (95.0%) relative humidity and 22 C, in the presence and absence of 400 ppm C 0 2. NaCl was added prior to exposure. The materials were in semi-solid cast (SSC) and pressure diecast (DC) states. Crystalline corrosion products were identified by X-ray diffraction (XRD). Alloy microstructure and corrosion morphology were characterized by scanning electron microscopy (SEM).
Inhibition Effect Of Phenylamine On The Corrosion Of Austenitic Stainless Steel (Type 304) In Dilute Sulphuric Acid
Authors: R.T. Loto, C. A. Loto and A.P.I. Popoola
The corrosion of austenitic stainless steel (type 304) in dilute sulphuric acid solutions in addition to recrystalized sodium chloride concentrates in the presence of specific proportions of phenylamine was studied with the aid of polarization resistance technique, electrode potential monitoring and coupon method. Results showed the overwhelming influence of the compound in corrosion inhibition with an inhibition efficiency of 97.5% from coupon analysis and 86.10% from polarization test at highest observed concentration of the inhibitor.
Authors: Lin Zhaoa, Bowen Li, Lin Linb, Ji Li
N80 steel has been widely applied in the petrochemical enterprises due to its cheap and resistance to corrosion. However, N80 steel is also vulnerable to the erosion caused by chloride ions, a representative of halogen ions, and as the result of chloride erosion, the seriously localized corrosion is induced, such as pitting corrosion, crevice corrosion, stress corrosion cracks, and so forth, exerting severe impact on equipment safety . So far, electrochemical noise (EN) technique has been a well-developed measure for monitoring the corrosion behavior of various environmental conditions because of its outstanding advantage of non-intrusiveness [2-5].
Authors: I. Ryakhovskikh, R. Bogdanov, T. Esiev, A. Marshakov
Initiation and propagation of near-neutral pH SCC was determined using X70 steel specimens. A mixture of NS4 solution with a borate buffer (pH 7.0) were used as background solutions. The tests of specimens were carried out under cyclic loading. Based on the data obtained in this study, the crack initiation occurred at local corrosion defects of steel surface such as corrosion pits.
A Corrosion Study On An Advanced Degradable Alloy For Multi-Stage Fracturing And A Comparison Of Two Measurement Methods
Authors: T. R. Ayers, M. Marya, C. Wang, T. Dunne, V. Singh
An advanced oilfield Al-Mg-X degradable alloy for multi-stage fracturing applications has been tested in both a 15% HC1 acid solution and a 3% KC1 brine (pH 6.5) to evaluate its corrosion or degradation over time through its hydrogen by-product. The potential advantage of this method over traditional ASTM G31 and IS011845 methods is that it might allow for indirect real-time estimates of the dimensions of a degradable alloy part exposed to well-defined environmental conditions.
Authors: Abhishek Mukherjee, Nicolo' Campagnol, Joris Van Dyck, Jan Fransaer, Bart Blanpain
Yttria stabilized zirconia (YSZ), as an excellent oxygen ion conductor, is increasingly used as an oxygen ion membrane for the anode in the FFC Cambridge process. However, using a membrane implies that it exhibits long term stability in the bath. It has been reported that YSZ is stable chemically, but fails electrochemically in molten CaCl2-CaO.
Authors: M.M. Sadawy, A.F.Ismael, M.A.Gouda
This paper addresses the issue of modeling the uncertainty about the corrosion values of oil steel tank, at any particular unsampled location. Our method is based on using geostatistics technique for modeling steel tank thickness from nondestructive data.
Authors: Jingkun Yu, Chengwan Cui, Xinzhong Tian, Liangcai Zhong, Xinli Wang, Wenbin Dai
In order to improve the thermal shock resistance of yttria by forming coarse grain with closed pores, a proper additive was firstly selected among calcium nitrate, cerium nitrate, and neodymium nitrate. Then, the effect of calcia on the grain growth of yttria was investigated.