Small scale, table top devices such as the rotating cylinder electrode (RCE) have received increased attention as a means for making decisions about material and inhibitor selections for oilfield applications. In order to utilize the corrosion data from an RCE to predict the behavior in a pipe geometry, it is necessary to establish correlations between the pipe flow velocity and the RCE rotation speed. Most often, correlations between the two geometries were attempted based on the equality of (i) the mass transfer coefficient or (ii) the wall shear stress. The validity of these correlations is critically examined in this study for corrosion under different conditions. Relevant corrosion data obtained in this study and from the literature were used. A recently developed mechanistic model for predicting CO2 corrosion rates for carbon steels was also used for identifying the mechanism and rate controlling steps for corrosion under conditions of interest to the oil and gas industry.

Subject
Piping, Cylinders, Correlation, Flow loop, Geometry, Corrosion rate, Predicted corrosion rate, Flow velocity, Wall shear stress, Hydrodynamics, Mass transfer, Experimental data, Mass transfer coefficient
Keywords:
corrosion, corrosion prediction, CO2 corrosion, mass transfer coefficient, wall shear stress, rotating cylinder electrode, pipe flow, hydrodynamics, hydrodynamics correlations
© 1995 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1995
Association for Materials Protection and Performance (AMPP)
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