There is generally a need for a better evaluation of inhibitors for sour oil pipe lines than provided by the traditional "bubble" test and "wheel" tests.

A test rig has been built that allows assesment of the ability of an inhibitor to become effective in a water phase under service simulating conditions. A subsequent test loop is then used to evaluate the inhibitor efficiency under flow simulation conditions.

Since hydrogen induced cracking is of interest in sour service pipe lines, one of the monitoring techniques used is hydrogen uptake rate in the steel.

Other techniques used are corrosion potential recording, Linear Polarisation Resistance Measurements, LPRM, and cathodic polarization current.

The design of the test rigs and the monitoring techniques are described and characterized through some preliminary results of actual inhibitor assessments.

Subject
Water, Hydrogen permeation, Inhibitor performance, Electrochemical cells, Monitoring techniques, Corrosion rate, Flow velocity, Corrosion loops, Free corrosion potential, Migration, Corrosion inhibitors, Electrodes, Hydrogen
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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