Corrosion in gas pipelines takes many forms. One of these forms is corrosion in vapor space areas. This paper describes results of tests designed to better understand this process in sour gas lines and how to inhibit this corrosion. Corrosion in the vapor space above sour fluids was found to proceed in an unsteady manner. The presence of liquid hydrocarbon lowered rates, whereas oxygen contamination increased rates. Methanol did not increase uninhibited rates but did diminish inhibitor effectiveness. The most effective inhibitors were found to be blends of imidazolines with light amines at particular ratios. Field confirmation of inhibition was demonstrated.

Subject
Water, Inhibitor performance, Corrosion rate, Sodium chloride, Pipelines, Vapors, Liquids, Chemical inhibition, Corrosion inhibitors, Oxygen, Immersion, Methanol, Hydrogen
© 1997 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).
1997
Association for Materials Protection and Performance (AMPP)
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