Long-Term Buckling Performance of HDPE Liners
Publication: Journal of Materials in Civil Engineering
Volume 13, Issue 3
Abstract
This research examines the long-term performance of high-density polyethylene liners frequently used in rehabilitating pipeline networks. Buckling of two groups of samples—each consisting of 20 steel pipes lined with HDPE liners—was examined in the laboratory. Group A was subjected to a uniform external pressure equal to about one-half of the buckling pressure, determined experimentally in a similar short-term test. Group B was subjected to one-third to one-fourth of this short-term pressure. Most liners in Group A failed (buckled) prematurely before the required ASTM period of 10,000-h. However, all 20 samples in Group B sustained the applied pressure for over 10,000 h. It was concluded that a design safety factor of 3 to 4 should be applied to short-term pressure to establish the long-term resistance of a flexible liner. Changes in the liner pipe volume with time, under the uniform pressure, were also monitored to estimate long-term creep in the HDPE material.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 13 • Issue 3 • June 2001
Pages: 176 - 184
History
Received: Feb 9, 1999
Published online: Jun 1, 2001
Published in print: Jun 2001
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