It is critical that a pipeline coating system be chemically resistant to the environment to adequately protect the pipeline. However, it is also critical that a pipeline coating system withstands very low temperatures during installation, and high service temperatures during operation. This paper provides a discussion on how our company evaluates external pipeline coating systems and sleeves, and how laboratory test results are used to develop guidelines and recommendations on the usage of these systems.

Manufacturers' coating systems are evaluated in the following tests: cathodic disbondment (ASTM G-8 and G-42); impact (ASTM G-14); peel (DIN 30670); bend (CSA Z245.20 M86); and shear (Materials Specification No. 09-AMSS-96). The cathodic disbondment tests are our standard methods of evaluating external pipeline coating systems. The impact, peel, bend and shear tests are used to help with assigning installation and service temperature windows for the coating systems.

These tests measure properties related to handling, installation, and in-service performance. The tests are conducted at temperatures intended to define limiting factors during pipeline installation and operation.

Subject
Test methods, Primers, Coatings, Materials, Piping, Pipelines, Installation, Disbondment, Shear, Polyethylene, Mastic, Coating systems, Three-layer polyethylene coating
Keywords:
cathodic disbondment, impact, peel, bend, shear, mastic, polyolefin, polyethylene
© 1995 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).
1995
Association for Materials Protection and Performance (AMPP)
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