This report describes the results of a joint research programme carried out by the members of the European Pipeline Research Group (EPRG). The preliminary part of the programme consisted of five HIC (Hydrogen induced cracking) Round Robin tests involving nine laboratories on grade X 60 to X 70 line pipe steels exhibiting different levels of HIC susceptibility. In addition, a smaller number of HSCC (hydrogen induced stress corrosion cracking, also called SSC-sulfide stress cracking) Round Robin tests were performed.

The main part of the programme consisted of full-scale tests using the same steels and the same liquid environment (according to NACE standard TM-01-77/1/) as in the Round Robin tests. The full-scale tests with the liquid environment were followed by full-scale tests with humidified gaseous environments saturated with H2S and CO2.

The HIC test results established during the Round Robin tests are discussed in terms of reproducibility and limits of sensitivity of the test. The HSCC laboratory test results exhibited large scatter in time to failure for the same values of stress and no correlation with the full-scale test results in regard to critical stress for failure and fracture location.

The results of the full-scale tests with the humidified gas revealed that this environment is much less aggressive than the liquid environment according to NACE standard TM-01-77.

Subject
Hydrogen induced cracking, Test methods, Pipe surfaces, Materials, Piping, Stress cracking, Acidity, Liquids, Stress, Steel, Scale, Hydrophobic interaction chromatography, Hydrogen
Keywords:
HIC, HSCC, Laboratory, Fullscale-Tests, Linepipe, Sour Gas
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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