by Peter Verlaan, Wavin Technology and Innovation affiliate/member company, TEPPFA Hardenberg, Netherlands
By using parameters out of the three scientific studies mentioned above as the starting point, we managed to prove by a non-scientific (field test) study that contractors can save installation time by
using thermoplastic sewer pipes and fittings.
by Peter Klouda, Technical Support Engineer, Iplex Pipelines, Queensland, Australia
In 2006 Brisbane City Council introduced polyethylene (HDPE) Nusewer system for their gravity sewers. One of the primary reasons cited was the requirement for a fully sealed system to overcome infiltration and root intrusion problems. Today a number of authorities around Australia are contemplating following Brisbane's lead.
The question this paper presents and seeks to answer is: "Is a polyethylene sewer system, which combines welded pipe and fabricated fittings, an improvement on existing PVC rubber ring jointed systems?”
Ipswich Water commenced reviewing the service lives of different pipe materials in its gravity sewer system. Unlike other pipe materials, PVC sewers did not have failure histories, or deterioration revealed in CCTV inspections, even after 25 years of service. Paper by A. J. Whittle Iplex Pipelines Australia Pty Limited & J. Tennakoon Ipswich Water, Queensland, Australia
With over 40 years of successful use for sewer systems in Australia, PVC sewer pipes offer a good track record for performance to be gauged. Sewers need to be well sealed and flexible systems to overcome infiltration, exfiltration, tree root intrusion and ground movement; occurrence of any of these issues can be very unpleasant for surrounding communities, and costly for the water authorities. The pipe system joint method and reliability therefore, are crucial factors in ensuring a well performing sewer system.
PVC Pipes are the high tech lifelines of our complex world, providing us with vital elements. The extraordinary smoothness of PVC Pipes, which is comparable to glass, prevents these vital lifelines from blocking up.
Report deliering the results of extensive investigation has been undertaken by the CSIRO and Iplex Pipelines to determine what other factors might influence the ability of a pipe joint to resist tree roots and to re-establish what might be the minimum interface pressure necessary to create joints of high integrity.