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Keywords: frequency
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Proceedings Papers

Paper presented at the CORROSION 2021, April 19–30, 2021
Paper Number: NACE-2021-16267
... electrical resistance. In both DC (direct current) and AC (alternating current) circuits, the impedance of a resistor can be calculated by (inline-equation). Resistors always have constant impedance which are independent of frequency of AC voltage in AC circuits. Capacitors are different from resistors...
Proceedings Papers

Paper presented at the CORROSION 2019, March 24–28, 2019
Paper Number: NACE-2019-13127
..., respectively. Pipeline Corrosion Subsurface Corrosion materials and corrosion riser corrosion flowline corrosion Production Chemistry Aerospace & Defense frequency texas 77084 Upstream Oil & Gas H2S management impedance permission coating system coating Corrosion Inhibition...
Proceedings Papers

Paper presented at the CORROSION 2019, March 24–28, 2019
Paper Number: NACE-2019-13184
..., in the absence of condensable hydrocarbons, decanethiol showed excellent persistency, filming behavior and superior mitigation of TLC. 7 flowline corrosion riser corrosion corrosion inhibitor materials and corrosion Upstream Oil & Gas Thickness resistance Subsurface Corrosion frequency...
Proceedings Papers

Paper presented at the CORROSION 2019, March 24–28, 2019
Paper Number: NACE-2019-13188
... voltage was 120 Hz frequency, and that very little of the AC voltage was related to the fundamental 60 Hz powerline frequency. This paper discusses the testing performed to confirm the source of the elevated AC current densities and quantify the associated corrosion risk. The mitigation strategy employed...
Proceedings Papers

Paper presented at the CORROSION 2019, March 24–28, 2019
Paper Number: NACE-2019-13290
... every three years to make an informed decision adjust for frequency and interval of flushing. INTRODUCTION Frequent failures were observed in dead legs associated to piping systems at the oil and natural gas liquids (NGL) units operating in wet sour service environment. The non-HIC resistant carbon...
Proceedings Papers

Paper presented at the CORROSION 2019, March 24–28, 2019
Paper Number: NACE-2019-13427
... management Production Chemistry Upstream Oil & Gas frequency integrity assessment permission replacement oilfield chemistry well integrity Corrosion Management dynamic segment pipeline manuscript operator smart pig assessment texas 77084 economic analysis Replacement Strategy defect...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-10861
..., the electrode configuration required for the indirect impedance measurement yields geometry-induced frequency dispersion that confounds interpretation. A proof of concept was established for using indirect impedance to detect corrosion in post-tensioned tendons. Bench-top experiments were performed to show...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11641
... and uncertainty assessment frequency Publication Division Houston failure mode planning horizon texas 77084 practical cost-benefit analysis external corrosion probability Practical Cost-Benefit Analysis For Pipeline Corrosion Management Tony Alfano, PE DNV GL (USA, Inc) 5777 Frantz Rd Dublin, OH...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11517
... to inhibitor leaching studies. However it remains unclear if chromate epoxy based primer can inhibit corrosion fatigue under atmospheric corrosion conditions. The protection provided by corrosion inhibitors under fatigue conditions can be affected by loading conditions (??, frequency) but it is also likely...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11632
... ABSTRACT The electrochemical frequency modulation (EFM) technique can consider as a new tool for electrochemical corrosion monitoring. The calculation of corrosion rate with a non-destructive and rapid technique is a necessity to study corrosion behavior of metals under loading and thermal...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11526
... frequency investigation H2S management Houston texas 77084 steel 28cr riser corrosion Corrosion Management permission corrosion resistant alloy Pipeline Corrosion Production Chemistry corrosion property NaCl solution high-phosphorus ni-p coating Upstream Oil & Gas Publication Division...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-10898
... materials and corrosion riser corrosion frequency Publication Division mitigation resistance Zinc passive film solution resistance Corrosion Management corrosion rate texas 77084 permission flowline corrosion Production Chemistry Upstream Oil & Gas impedance AC mitigation zinc specimen...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11042
... are able to perform valid EN measurements. This paper is aimed at guiding users of the EN technique by providing the minimum knowledge for EN measurements, including the necessary validation of the signals measured at different sampling frequencies by calculation of their power spectral densities. Two...
Proceedings Papers

Paper presented at the CORROSION 2018, April 15–19, 2018
Paper Number: NACE-2018-11016
... and corrosion flowline corrosion Artificial Intelligence frequency passive film well integrity passive film property Upstream Oil & Gas Publication Division Pipeline Corrosion riser corrosion carbon steel Houston OCP capacitance specimen manuscript texas 77084 permission tc-128 steel...
Proceedings Papers

Paper presented at the CORROSION 2017, March 26–30, 2017
Paper Number: NACE-2017-8944
... are exposed to large thermal gradients particularly during shut down. Risers are also subjected to significant fatigue loading, though under conditions different from flow lines, because the fatigue loading frequencies are higher. 1 As these deep-water floating production systems are also exposed...
Proceedings Papers

Paper presented at the CORROSION 2017, March 26–30, 2017
Paper Number: NACE-2017-9001
... obtained at a stress ratio of R = 0 with different testing rigs to investigate the influence of testing frequencies (f = 20, 150Hz). The test results represent the basis for a concept that will be able to estimate the impact of corrosion fatigue in the VHCF region. INTRODUCTION The amount of renewable...
Proceedings Papers

Paper presented at the CORROSION 2017, March 26–30, 2017
Paper Number: NACE-2017-9106
...), Electrochemical Impedance Spectroscopy (EIS) and Electrochemical Frequency Modulation (EFM). The data presented in this paper have been conducted over 5 days at variable condensation rates to evaluate the feasibility and accuracy of the methods applied. In addition, TLC rates have also been measured by weight...
Proceedings Papers

Paper presented at the CORROSION 2017, March 26–30, 2017
Paper Number: NACE-2017-9145
.... Materials are identified from vibrational spectra, which depend on material chemical composition, structure, strain and structural disorder. 2-5 Information encoded in Raman spectra, such as frequency shift of the Raman line with respect to the excitation laser line, the number of observed lines...
Proceedings Papers

Paper presented at the CORROSION 2017, March 26–30, 2017
Paper Number: NACE-2017-9203
... ABSTRACT Fatigue and fracture of line pipe steels in a sour inhibited environment is presented. Fatigue crack growth rate (FCGR) was investigated as a function of frequency at several different ?K values at a pH of 3.5 and 0.21psia (0.00144MPa) H 2 S. The role of rise time and hold time were...

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