There are many material standards, specifications and procedures for selecting and testing materials for use in sour service. The majority concentrate on small scale samples, and base material properties. These type of tests can be miss-leading, as it is assumed that the measured properties from selected samples of a pipeline for instance will provide all the information required to select that item for use in sour service. Small scale tests such as those used in NACE TM0284(1), NACE TM0177(2) do not and can not take into account the effect of residual stress from manufacture and welding. In addition sample selection can be arbitrary, in some cases the wrong surfaces are tested. This paper traces the development of a large scale test method which has now been published by the UK Health and Safety Executive and is becoming included in a number of Oil company pipeline specifications.

Subject
Test methods, Materials, Hydrogen permeation, Piping, Manufacturing, Linepipe, Pipelines, Stress, Scale, Stress oriented hydrogen induced cracking, Stress corrosion cracking, Residual stress, Samples
Keywords:
Full Ring Test, SOHIC, SSCC, HIC, Sour Service, Hydrogen Damage, H2S, Welds
© 1999 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).
1999
Association for Materials Protection and Performance (AMPP)
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