Plastic pipes favoured for contaminated land
Dec 20, 2006
Contaminated land is not the best substrate through which to lay a water pipe. But now a series of tests have been carried out that favour plastic pipe systems over those of traditional materials.
“Plain PE pipe is relatively translucent to petrol (estimated 5% petrol, 95% water).” Explains Bowman. “But the inclusion of a layer of welded aluminium in the middle of the wall of a PE pipe stops the migration of the petrol!”
However, Bowman says that to create an effective pipe network that stops petrol migration, the use of metallic fittings is required. “Iron based pipe systems show significant migration of petrol into the pipe and other contamination believed to arise from the lining used to stop the corrosion of these iron based pipe systems.”
He insists that the iron based systems were the worst performing, except for just plain PE pipes. His observations are therefore significant for pipe systems to carry potable water and to be installed in ground that may contain contamination arising from a previous industrial use.
“PE-Al-PE pressure pipe systems with metallic fittings offer the best and most secure solution for the transport of water in contaminated land,” he says.
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