The prevention of hydrate formation in gas lines requires the injection of high concentrations of alcohols (methanol or glycol). In the resulting largely artificial medium, the addition of a pH controlling agent (amines or MBTNa) enables the stratified aqueous phase to be rendered completely non-corrosive. In the gaseous phase, the corrosion product itself is an excellent pH controller for the condensed water, which is immediately saturated in iron bicarbonate.

This method of preventing CO2 corrosion in long crude gas lines has been successfully used by the ELF AQUITAINE Group since 1972, in Italy, Holland and Norway.

This article describes the principle underlying these treatments, together with the associated methods of selection and control.

Subject
Corrosion prevention, Water, Piping, Corrosion rate, Condensation, Pipelines, Iron, Solubility, Partial pressures, Acidity, Corrosion inhibitors, Glycol, Crude
Keywords:
CO2 corrosion, antihydrate, gas pipelines, pH(1 bar = 100 kPa)
© 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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