Numerous simple methods exist by which a designer may calculate the collapse pressure of a pipeline liner. While these methods appear to be useful for low-strain-yielding materials such as HDPE, they are limited in their ability to describe more elastic materials such as plasticized polyamide-11. A nonlinear finite element method has been developed that uses the full stress-strain curve of the polymer material to describe the material behavior, and calculate the critical bucking pressure and annulus volume at that pressure. If one knows the volume in the annulus during high pressure operation, it then becomes possible to calculate the maximum pre-decompression annulus pressure that would be allowed without exceeding the buckling point after maximum expansion of the annulus gas with pipeline decompression. This paper describes the method and limited experimental verification of the concept.

Subject
Materials, Piping, Deformation, Modeling, Annulus, Pipelines, Gas pressure, Buckling, Differential pressure, Pressure, Wall thickness, Steel, High density polyethylene
Keywords:
Liner, Collapse, Modeling, Buckling, Annulus
© 2004 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).
2004
Association for Materials Protection and Performance (AMPP)
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