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01061 Rotating Cage - Top Ranked Methodology for Inhibitor Evaluation and Qualification for Pipeline Applications

Picture for 01061 Rotating Cage - Top Ranked Methodology
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Product Number: 51300-01061-SG
ISBN: 01061 2001 CP
Author: Sankara Papavinasam, R.Winston Revie, Michael Attard, Alebaehew Demoz, John C. Donini, and Kirk Mich
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Based on the literature database and information from pipeline companies, the methodologies used to select inhibitors were critically reviewed. Round robin tests were carried out in three laboratories to assess reproducibility of the wheel test. In total, twelve (12) laboratory methodologies were evaluated. Field monitoring was carried out in Alberta at three fields - oily gas, gassy oil and oil transmitting- to support the laboratory evaluation, and to define the conditions under which specific laboratory methodologies can be used with the confidence that the laboratory data will predict field performance. Based on a quantitative comparison of field and laboratory general corrosion rates, pitting rates, and percentage inhibition (calculated from general corrosion rates and pitting rates) under three different field conditions using three continuous and three batch inhibitors, the rotating cage, was ranked as the top methodology. In addition, this methodology is inexpensive and relatively simple to carry out. The rotating cage is recommended as a methodology to be standardized for evaluating and qualifying inhibitors for sour service. Keywords: Field experiments; rotating cage; rotating cylinder electrode; jet impingement; rotating disk electrode; wheel test; high-temperature, high-pressure; pitting corrosion; wall-shear stress; flow; inhibition; ranking; monitoring.
Based on the literature database and information from pipeline companies, the methodologies used to select inhibitors were critically reviewed. Round robin tests were carried out in three laboratories to assess reproducibility of the wheel test. In total, twelve (12) laboratory methodologies were evaluated. Field monitoring was carried out in Alberta at three fields - oily gas, gassy oil and oil transmitting- to support the laboratory evaluation, and to define the conditions under which specific laboratory methodologies can be used with the confidence that the laboratory data will predict field performance. Based on a quantitative comparison of field and laboratory general corrosion rates, pitting rates, and percentage inhibition (calculated from general corrosion rates and pitting rates) under three different field conditions using three continuous and three batch inhibitors, the rotating cage, was ranked as the top methodology. In addition, this methodology is inexpensive and relatively simple to carry out. The rotating cage is recommended as a methodology to be standardized for evaluating and qualifying inhibitors for sour service. Keywords: Field experiments; rotating cage; rotating cylinder electrode; jet impingement; rotating disk electrode; wheel test; high-temperature, high-pressure; pitting corrosion; wall-shear stress; flow; inhibition; ranking; monitoring.
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Appropriate Rotating Cage Speed for Testing Inhibitors Under Field Simulated Flow Conditions

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This paper presents preliminary computational fluid dynamics and experimental results from a systematic study designed to show how the above mentioned empirical “rotating cage” equation correlates with the average or maximum wall shear stress on the rotating coupons, at different conditions.
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51318-10903-Evaluation of corrosion inhibitor with high speed rotating cage

Product Number: 51318-10903-SG
Author: Susumu HIRANO, Toshiyuki SUNABA and Takashi ITO
Publication Date: 2018
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Three brands of oil-soluble water-dispersible inhibitors were evaluated with the rotating cage autoclave (RCA). Some inhibitors showed enough efficiency at high rotating speed but the others require more dosage to maintain the same result.

 
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