ASTT Technical Forum – New Zealand
Auckland, New Zealand
The next ASTT Technical Forum will be taking place in Auckland, New Zealand on Wednesday 7 August 2019
Blair Telfer has been involved in the New Zealand water industry and the application of Trenchless Technology for over 20 years. He has held a number of roles including working as a local authority client, a contractor and a consultant. Blair is currently General Manager for Interflow in New Zealand, and is also the ASTT’s New Zealand Councillor.
Simon Ganley – Contracts Manager at The Fletcher Construction Company Ltd trading as PipeWorks NZ
Presentation on case study: Turning the lights on with UV CIPP Lining – Northern Corridor Improvements
UV Cured In Place Pipe: New technology brings light to the end of the tunnel and brings a state of the art technique to the pipe renewal market in NZ.
Presentation: Suitability of PE Pipe Systems for Conveying Disinfected Drinking Water Under Pressure
Polyethylene (PE) pipe systems have been employed in potable water distribution networks for over five decades and several studies have proven it to exhibit one of the lowest failure rates amongst piping materials. Nonetheless, field experience from discrete parts of the USA, Europe, and Australia indicates that when high water temperatures converge with high concentrations of specific chlorine-based disinfectants, the lifetime of PE pipe systems can be significantly reduced. In these cases premature brittle pipe failure can be observed.
Extensive studies carried out by asset owners and laboratories both in the USA and Europe as well as analysis of failed pipe specimens by Qenos support the following proposed mechanism for this type of failure. The failure begins with 1) loss of antioxidants at the thin layer at the inside of the pipe followed by 2) oxidative degradation of the PE material at the inside pipe wall resulting in the initiation of a crack, and subsequent 3) propagation of the crack through mostly non-degraded PE in the core and outside layers of the pipe wall via a mechanism similar to the slow crack growth process. Identification of the mechanism has allowed PE manufacturers to address both the crack initiation and propagation for this type of failure, resulting in the development of PE resins with enhanced performance in service conditions where fluid temperatures rise above the reference 20°C and higher concentrations of disinfectants are encountered.
The paper will summarise the studies and internal findings that support the proposed mechanism and provides performance data in accelerated test methods, including NOL-ring test and ASTM F2263, of the materials with higher resistance to disinfectants. The results support use of disinfectant resistant PE100 as an effective integrity measure against premature “brittle” failure of pipe caused by PE degradation.
Jeroen Wassenaar is the Market Segment Manager at Qenos for polyethylene pipe, dairy, and blow moulding applications. He is responsible for the conception and delivery of the segment strategies as well as driving the evolution and promotion of the product slate. Prior to joining Qenos in 2017, he worked for seven years in the Polymers business unit of French oil major Total in various R&D and marketing positions. Holding a PhD in chemistry from the University of Amsterdam, his areas of expertise include polymer chemistry and its commercial applications.
Presentation: A difficult low-grade, deep HDD curved sewer pipe installation using segmented rubber ring jointed pipes
When installing pipe systems using Horizontal Directional Drilling many limitations prevent a successful outcome when a low flat grade of a gravity sewer pipeline is required.
This paper will provide a case study of an installation that occurred on a busy local highway in Pakuranga Auckland City. It will provide details of how the contractor worked together with the utility company and their design consultant to provide an innovative methodology to install this deep pipeline.
A small work site footprint prevented the use of pipe-strings to be used on this busy section of highway, the contractor in conjunction with the pipe supplier was able to have manufactured a segmented pipe solution that allowed minimal disruption to the surrounding community.
Through the contractors’ partnership with an internationally based HDD steering company they were able to achieve extremely low grades of 0.9% & 1.2% on two separate HDD pipe insertions. Throughout the contract/project curved alignments were used to eliminate a-number-of manholes, including one that was removed on the pipe section that this paper will show case.
In the pre-construction design scope of this project Micro Tunnelling was preferred however this innovative methodology allowed HDD to be used in these challenging conditions.
Todd Randell is a Business Development Manager working for Hynds Pipeline Systems. He has had over 30 years-experience operating within the water and pipeline market sectors. During his working career he has developed a broad knowledge of Concrete, Ductile Iron, Polyethylene, Polypropylene, PVC pipes and GRP Jacking Pipes.
For more many years Todd conducted water industry training operating as a Tutor operating in the water industry presenting in conjunction with Connexis.
Todd has a strong interest in Trenchless technology he has undertaken many pipe bursting installations around New Zealand and has worked on construction sites throughout New Zealand, Australia and in the United States of America.
Registration is NZ$75 for ASTT members and NZ$95 for non-members, inclusive of GST (registration will be processed in AUD).
Places are limited, register today to avoid disappointment!
If you are interested in sponsoring or speaking at one of these events, please contact email@example.com. Please note, speakers may change without notice.
This ASTT Technical Forum is proudly sponsored by Qenos