Multiwall pipe systems, in reference to a plastic pipe within steel pipe, have been used to overcome mechanical limitations of plastic materials. This concept is further developed to include a composite pipe as the inner liner. Fiberglass reinforced thermosets have been frequently applied to situations involving attachment of parts to metals since they exhibit coefficients of thermal expansion similar to steel. Any significant differences in the coefficient would cause high stresses during temperature changes. It is shown how this principle applies to pipe. Moreover, the fiber reinforcement increases the external load rating of encased pipe. The possibility of collapse from vacuum has been removed. The manufacturing process involves casting a grout between the two pipe structures. This procedure provides a second defense corrosion control program since the grout passivates the steel. It also allows joining lengths of pipe with a welded connection, in addition to the more standard flanged configuration.

Subject
Steel structures, Materials, Piping, Manufacturing, Internal pressure, Thermal expansion, Grout, Steel pipes, Interfaces, Plastics, Steel, Corrosion protection, Thermoset
© 1984 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).
1984
Association for Materials Protection and Performance (AMPP)
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