Flow regime and the total dissolved solids (TDS) of the brine are important factors to consider in the selection of a corrosion inhibitor for continuous treatment of a wet-gas pipeline. Flow regime maps for a variety of conditions are published and computer software is commercially available to make the necessary calculations.

The need for corrosion inhibitors that partition primarily to the water phase, for use in low velocity pipelines, is widely recognized. Brine TDS has a major effect on inhibitor solubility, and thus on partitioning behavior.

A case history is presented where the inhibitor was selected using a laboratory procedure specifically designed to simulate flow regime and duplicate brine TDS. The inhibitor selected has been successfully implemented in the field.

Monitoring techniques are discussed and the need for more than one monitoring method is emphasized.

Subject
Corrosion failures, Water, Inhibitor performance, Corrosion rate, Pipelines, Solubility, Inspection, Partitioning, Inhibitor treatment, Internal corrosion, Corrosion inhibitors, Brines, Pitting
Keywords:
pipeline, gas, carbon dioxide, hydrogen sulfide, inhibitor partitioning, flow regime, sour gas, corrosion testing, gas gathering
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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