Glycol can be used to prevent hydrate formation and reduce corrosion in subsea wet gas pipelines. Top-of-the-line corrosion was studied in a one phase gas flow loop with wet gas containing glycol and CO2. The corrosion rate increased with CO2 partial pressure, gas flow rate and condensation rate. A large reduction in corrosion rate in the top of the line was observed when glycol was added to the gas.

Transport of glycol from a liquid phase trapped under a hydrocarbon layer to the top of the line in a large wet gas pipeline was studied in a three-phase flow loop. The small amounts of glycol in the gas phase were measured with a radioactive tracer technique using 14C-labeled glycol. The amount of glycol in droplets in the gas increased markedly with the gas velocity in the pipeline. These droplets provide the gas phase with a glycol source which can keep the gas phase saturated with glycol vapour. This can make a significant contribution to the glycol content of the liquid condensing in the top of the line.

Subject
Water, Droplets, Corrosion rate, Tubes, Walls, Condensation, Pipelines, Condensation rates, Liquids, Film formation, Glycol, Wet gas, Hydrocarbons
Keywords:
carbon dioxide, gas pipelines, glycol, condensation, top-of-the-line corrosion, fluid flow
© 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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