Alkanolamine plants processing natural gas and gas liquids containing only carbon dioxide as the contaminant acid gas are often troubled by high corrosion rates. Capital constraints sometimes require the plant operator to use carbon steel in the construction of piping and vessels in locations where stainless steel might otherwise be employed. Rich amine acid gas loadings sometimes exceed recommended or design levels, increasing the corrosivity of the system. Typical corrosion inhibitor products and packages are sometime ineffective in controlling corrosion at desired levels when one or both of the above conditions are present. This paper presents a procedure used to test the effectiveness of corrosion inhibitors on-stream, and demonstrates the effectiveness of a sulfur-containing inhibitor in controlling CO2 corrosion in gas/gas and gas/liquid amine plants.

Subject
Acids, Corrosion rate, Solvents, Natural gas, Liquids, Amines, Corrosion inhibitors, Corrosion data, Corrosion probes, Corrosion protection, Corrosion coupons, Risk reduction, Linear polarization resistance
Keywords:
carbon dioxide, corrosive gas, amine plants, natural gas, natural gas liquids, corrosion inhibitor, corrosion inhibition
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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