From early 2000s, new coatings, with almost 100% efficiency, began to be applied on new onshore pipelines. In special, the three-layer polyethylene (3LPE). Cathodic protection (CP) designs had to be adapted, due to the significant drop in current demand required. On the other hand, inconveniences have arisen, such as the increase in electrical interference. In addition, ISO 15589-1 [1] sustains that bonding parallel pipelines with different coatings is unlikely to be successful and that independent CP systems may be required. Opposing to this premise, since the beginning of the use of 3LPE, pipes with different coatings have been bonded in Brazil with very positive results. This work details with examples how this Brazilian approach does not put the structures in risk, on the contrary, it helps to reduce the level of interference in new pipelines and does not hinder the execution of specialized inspection techniques.

Subject
Electric current, Coating inspection, Piping, Cathodic protection, Cathodic current, Pipelines, Coating surveys, Rectifiers, Electric potential, Corrosion protection interference, Electrical interference, Soil, Three-layer polyethylene coating
Keywords:
cathodic protection, coating, bonding
© 2023 Association for Materials Protection and Performance (AMPP) and ABRACO. All rights reserved. This work is protected by both domestic and international copyright laws. 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 prior written permission. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP or ABRACO. Responsibility for the content of the work lies solely with the author(s).
2023
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.