A spectroscopic study of leak failures in cross‐linked polyethylene tubing used in domestic water supply systems

Recent leak failures in cross‐linked polyethylene tubing from several US locations have been studied using microscopy and microscopic spectroscopy. Such failures compromise the use of a material that has been regarded as more environmentally sustainable. The failures appear to be the result of local...

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Published in:Surface and interface analysis 2017-12, Vol.49 (13), p.1366-1371
Main Authors: Walzak, Mary Jane, Stewart McIntyre, N., Manuel Uy, O.
Format: Article
Language:English
Subjects:
Chemical attack
chloride attack
Chlorine
Cracking (chemical engineering)
Cross-linked polyethylene
Failure
Fluid dynamics
FTIR spectroscopy
Heat recovery systems
Inspection
Oxidation
Polyethylene
polymer oxidation
scanning electron microscopy
Tubes
Turbulence
Turbulent flow
Water flow
Water supply systems
XPS
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Stewart McIntyre, N.
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description Recent leak failures in cross‐linked polyethylene tubing from several US locations have been studied using microscopy and microscopic spectroscopy. Such failures compromise the use of a material that has been regarded as more environmentally sustainable. The failures appear to be the result of local chemical attack by aqueous chlorine that reacts with the polymer, leading to its oxidation, decrystallization and expansion of its volume. This creates stress fields that lead to chemically induced cracking of the polymer and, eventually, failure of the tubing. Each failure studied in this work was found to be associated with a micro‐protrusion in the inside diameter of the tubes; it is proposed that turbulence in the water flow behind the protrusion may accelerate local mechanical and chemical attack of the polyethylene tubing. A simple inspection method is suggested to detect the presence of such protrusions before installation of the tubing. Copyright © 2017 John Wiley & Sons, Ltd.
doi_str_mv 10.1002/sia.6243
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source Wiley-Blackwell Read & Publish Collection
subjects Chemical attack
chloride attack
Chlorine
Cracking (chemical engineering)
Cross-linked polyethylene
Failure
Fluid dynamics
FTIR spectroscopy
Heat recovery systems
Inspection
Oxidation
Polyethylene
polymer oxidation
scanning electron microscopy
Tubes
Turbulence
Turbulent flow
Water flow
Water supply systems
XPS
title A spectroscopic study of leak failures in cross‐linked polyethylene tubing used in domestic water supply systems
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