Fusible Polyvinyl Chloride Pipe Provides Owner with a Monolithic ...
Fusible Polyvinyl Chloride Pipe Provides Owner with a Monolithic ...
Fusible Polyvinyl Chloride Pipe Provides Owner with a Monolithic ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
Research indicates that HDPE can be degraded by<br />
common water disinfectants leading to Stage III<br />
“end of life failure”<br />
• Polyethylene is a polyolefin family<br />
plastic – which oxidizes <strong>with</strong>out<br />
the aid of antioxidants that are<br />
added to the HDPE formulation<br />
• Over 20 research papers published<br />
since 2004 document the failure of<br />
HDPE (PE80, PE100) pipe in the<br />
presence of water disinfectants –<br />
Stage III failure resulting from<br />
oxidation (rapid antioxidant<br />
consumption) and polymer chain<br />
scission<br />
i<br />
• North American standards (ASTM<br />
and AWWA) do not give guidance<br />
on a design factor to account for<br />
this newly documented<br />
phenomenon<br />
• Life expectancies do not consider<br />
Stage III failure<br />
• Safety factors do not consider<br />
oxidative failure mode<br />
• PVC has been demonstrated to be<br />
resistant to oxidation due to water<br />
disinfectants<br />
Hoop Stress<br />
Stage III oxidative induced cracking polyolefin family pipe – Choi 2008<br />
Chemical Aging<br />
Premature Stage<br />
III Failure<br />
Time<br />
Hydroperoxide decomposition of polyethylene under<br />
attack by chlorine dioxide – L. Audouin et al. 2007
Change language