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51313-02294-Effects of Rotating Cage Autoclave Design on Shear Stress and Flow Pattern

Picture for Effects of Rotating Cage Autoclave Design on Shear Stress and Flow Pattern
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Product Number: 51313-02294-SG
ISBN: 02294 2013 CP
Author: Amit Kumar
Publication Date: 2013
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$20.00
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Effects of Autoclave Designs on Shear Stress and Flow Pattern

A. Kumar J. Pacheco S. Ling S. Desai and R. V. Reddy
ExxonMobil Upstream Research Company Houston


In O&G industry corrosion susceptibility of materials and inhibitor performance are often evaluated by testing their performance in the laboratory using autoclaves. Two different types of autoclaves viz. rotating cage and Rushton blade impeller are studied in this paper. Experiments were conducted to quantify the effect of both autoclave designs on corrosion rates of low alloy steels in CO2 environment. Computational fluid dynamics (CFD) models were developed and used to understand the effect of complex flow pattern on shear stress on coupons surfaces and corrosion patterns for both autoclave configurations. Results are presented to show the variation of wall shear stress caused by the complex flow of water over the coupon surfaces for both autoclave configurations. The wall shear stress distribution on coupon surfaces is compared with observed corrosion pattern over the coupon surfaces. It is found that the variation of predicted shear stress correlates reasonably well with the corrosion pattern observed in the experiments.

Keywords: Computational fluid dynamics Rushton blade autoclave rotating cage autoclave (RCA) wall shear stress flow
 

Effects of Autoclave Designs on Shear Stress and Flow Pattern

A. Kumar J. Pacheco S. Ling S. Desai and R. V. Reddy
ExxonMobil Upstream Research Company Houston


In O&G industry corrosion susceptibility of materials and inhibitor performance are often evaluated by testing their performance in the laboratory using autoclaves. Two different types of autoclaves viz. rotating cage and Rushton blade impeller are studied in this paper. Experiments were conducted to quantify the effect of both autoclave designs on corrosion rates of low alloy steels in CO2 environment. Computational fluid dynamics (CFD) models were developed and used to understand the effect of complex flow pattern on shear stress on coupons surfaces and corrosion patterns for both autoclave configurations. Results are presented to show the variation of wall shear stress caused by the complex flow of water over the coupon surfaces for both autoclave configurations. The wall shear stress distribution on coupon surfaces is compared with observed corrosion pattern over the coupon surfaces. It is found that the variation of predicted shear stress correlates reasonably well with the corrosion pattern observed in the experiments.

Keywords: Computational fluid dynamics Rushton blade autoclave rotating cage autoclave (RCA) wall shear stress flow
 

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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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Appropriate Rotating Cage Speed for Testing Inhibitors Under Field Simulated Flow Conditions

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ISBN: 9148 2017 CP
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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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