Starting from a "worst case" corrosion rate prediction with the deWaard-Milliams equation, correction factors can be applied to quantify the influence of environmental parameters and of corrosion product scale formed under various conditions. Equations are proposed for each factor. A low temperature scale formed in condensing water can cause a reduction in the top-of-the-line corrosion rate in pipelines. At higher temperatures a more protective scale forms even under high liquid flowrates. The decrease of corrosion rates caused by dissolved Fe is accounted for with a pH correction factor. The effect of the presence of a liquid hydrocarbon phase is included. Equations are presented which enable the effect of glycol injection on corrosion to be calculated along the length of a pipeline. Combination of effects in the model is discussed.

Subject
Water, Corrosion rate, Predicted corrosion rate, Saturation, Condensation, Pipelines, Flowrate, Acidity, Liquids, Corrosion scales, Corrosion modeling, Film formation, Glycol
Keywords:
carbon dioxide, wet gas, condensation, iron carbonate, glycol, corrosion model
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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