HDPE liners have been advantageously installed and used for many years now. Due chiefly, to permeability and chemical resistance problems, however, HDPE liners are limited in hydrocarbons and high temperature service. Other exotic materials have sometime become a very expensive choice, but the market steel needs a cost effective solution. Recent developments in the extrusion technology can now offer viable alternatives to HDPE and engineering thermoplastics.

Swelling and plasticization due to hydrocarbons can be controlled through the use of multi-layer structures. High temperature applications can be effectively addressed through the use of engineered formulations of silane based cross-linked polyethylene (PEXb) which allow the production of fusible liners.

Both multi-layer and PEXb liners can be installed using conventional HDPE equipment. In fact these new technologies are effectively creating new classes of engineering liners able to fill the gap between low price commodity polymers and expensive engineering thermoplastics.

Subject
Water, Materials, Piping, Deformation, Moduli, Adhesive strength, Swelling, High density polyethylene, Crude, Polyethylene, Risk reduction, Hydrocarbons, Yield strength
Keywords:
liner, collapse, multi-layer, PEX, cross-linked polyethylene, HDPE
© 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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