Abstract
The experience related to use of 13Cr supermartensitic stainless steel (13Cr) in the Tune offshore project is described. Tune is a gas condensate field close to the Oseberg field on the Norwegian Continental Shelf. For the Tune project 13Cr was used for two 10km long 12" flowlines, installed by reel barge laying in 2001. As a consequence of problems related to cracking and leaks, first due to fabrication weld quality, and later due to hydrogen induced stress cracking caused by cathodic protection, the SMSS lines were replaced by carbon steel flowlines in 2002. The paper covers the initial qualification work, the fabrication, the repair work and lessons learned from failure investigations.
Subject
Materials,
Piping,
Welding,
Leaks,
Inspection,
Installation,
Stress cracking,
Flowlines,
Mechanical failure,
Defects,
Repair,
Cracks,
Hydrogen
© 2005 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).
2005
Association for Materials Protection and Performance (AMPP)
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