The effluent hydrogen flux from a pressure vessel or linepipe in wet H2S service is a measure of the concentration of diffusible hydrogen in the steel, and hence also of the propensity to hydrogen induced cracking in the steel wall. Effluent hydrogen can be collected from the external surface and quantified as an average flux over a certain time by volumetric or barometric measurements. It can be measured also as a direct hydrogen flux by amporemetric measurements using the Devanathan/Stachurski type of measuring devices. The work reported here compares physically measured hydrogen egress and hydrogen flux measured by sealed dry contact amporemetric probes. The quick response of the amporemetric probe to changes in hydrogen uptake rate in the steel makes it a promising tool in environment severity monitoring.

Subject
Hydrogen induced cracking, Steel surfaces, Hydrogen permeation, Piping, Fluxes, Electrochemical cells, Probes, Palladium, Effluent, Hydrogen flux, Steel, Equipment, Hydrogen
Keywords:
hydrogen permeation, sour service, hydrogen induced cracking, full scale tests
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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