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Identifying mechanically induced chemical changes to vintage grade high density polyethylene pipes during squeeze-off

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Version 2 2024-06-03, 13:57
Version 1 2018-01-12, 15:33
journal contribution
posted on 2024-06-03, 13:57 authored by Nolene ByrneNolene Byrne, R De Silva, Tim HilditchTim Hilditch, K Lenghaus
Squeeze-off is widely used within the gas industry for temporary interruptions to supply, both when extending and repairing the polyethylene (PE) pipe network. Over the years a number of pipe failures, have been attributed to damage caused at the squeeze-off location, often linked to non-standard squeeze-off practices. The purpose of this paper is to examine PE pipes that have been squeezed in the laboratory under ASTM and non-ASTM standard conditions to determine if any changes to the PE structure can be measured. Changes in the PE due to squeeze-off was measured by FTIR at the squeeze-off ear. The carbonyl index (CI), a measure of polymer degradation, was calculated for the various squeeze-off conditions and it was found that over-compression of the PE pipe caused the greatest amount of damage to the pipe and that is directly linked to the integrity of the pipe prior to being squeezed-off.

History

Journal

Polymer testing

Volume

65

Pagination

242-248

Location

Amsterdam, The Netherlands

ISSN

0142-9418

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2017, Elsevier Ltd

Publisher

Elsevier