Inspection of offshore pipelines is essential to provide vital information required for integrity assessment, to allow data driven engineering decisions to be made and prevent costly failures. To identify and quantify anomalous features and defects including internal corrosion damage, it is common to use inline inspection (ILI) pigs.

Conventional ILI requires deployment of a tool which has a combination of characteristics that allow the passage of a free-swimming assembly through the pipeline without disruption to normal operation. However, some pipelines deviate from conventionally "piggable" pipelines, so inspection for internal corrosion could be complex and/or unfeasible. To establish the integrity of these difficult to pig pipelines, Internal Corrosion Direct Assessments have been performed to ascertain the condition of these pipelines with considerable success.

This paper presents experience from applying Internal Corrosion Direct Assessment (ICDA) for offshore pipelines in the North Sea. The paper focuses on how these assessments have been performed, challenges experienced, results and lessons learnt.

Subject
Risers, Water, Water droplets, Inline inspection, Pipelines, Inspection, Internal inspection, Internal corrosion, Wall thickness, Internal corrosion direct assessment, Carbon steel, Pigging, Oil
Keywords:
Inline Inspection, Corrosion, Pigging, defects etc
© 2016 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).
2016
Association for Materials Protection and Performance (AMPP)
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