It has long been believed that the effectiveness of chemical inhibition of flow induced corrosion was limited by the prevailing flow rate or wall shear stress. The limitation is usually expressed in terms of a critical velocity calculated on the basis of API-RP-14E. At high flow rates and severe turbulence, a corrosion inhibitor in CO2 environments has to be effective in two modes; on the bare metal surface as well as on an iron carbonate corrosion product layer. New chemistry, developed on this basis, proved to be highly effective (99.9%) in reducing general corrosion as well as eliminating flow induced localized corrosion under conditions much more severe than predicted by the critical velocity. The effectiveness of the new chemistry has been established for CO2/H2S partial pressure ratios equal to or greater than 2000, and neither the metallurgy nor the type of produced condensate appear to affect the degree of protection achievable. The results were confirmed in two large two-phase flow loops for 1" and 2" tubing under nominally identical conditions in terms of severity of corrosion. The inhibitor effectiveness was established over a wide range of temperatures.

Subject
Inhibitor performance, Corrosion rate, Iron carbonate, Autoclaves, Metal coupons, Condensates, Iron, Tubing, Corrosion losses, Chemical inhibition, Metals, Corrosion inhibitors, Corrosion coupons
© 1990 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).
1990
Association for Materials Protection and Performance (AMPP)
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