A test lab working for a seamless pipe manufacturer launched a research program to improve the knowledge on NACE TM0177 Method A test variability when proof-rings are used. This paper reviews the loading principles of the proof-ring arrangements. Calculated stress values including stress release over the 720 hours test duration and as-measured values are compared in order to improve the knowledge on loading method and measurement of the actual stress and the stress distribution within the tensile specimen when exposed in the H2S environment. Additional influencing factors such as specimen diameter decrease throughout the test and possible bending effects are also addressed.

Subject
Test methods, Materials, Materials performance, Gauges, Tensile tests, Lead, Stress, Bending, Elongation, Tensile stress, Equipment, Sulfide stress cracking, Test specimen
Keywords:
NACE TM0177 Method A, constant load, proof-ring, stress, stress release, specimen bending
© 2009 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).
2009
Association for Materials Protection and Performance (AMPP)
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