MACHINERY | STANDARDS & TESTING
The robust physical properties of HDPE conduit help to simplify the addition of extra cables
conduits are in-situ conduits, typically where one or more cables are already installed. When HDPE conduit or fabric divider is installed into occupied conduits, the process is referred to as an override. “Fabric divider does not provide the wide range
of physical properties and performance capabili- ties inherent in HDPE innerduct or micro duct,” said MacNevin. “Cables can be jetted into HDPE innerduct and micro duct over long distances – which lowers cable installation costs. Jetting is not an option for fabric dividers – which require the cables to be pulled or winched into place, resulting in shorter installation distances.” Factors like this make HDPE conduit a more
versatile choice, he said. NDT evaluation
PPI has also published an overview of non-destruc- tive testing (NDT) and evaluation techniques that have been introduced into the plastic pipe indus- try. The document – TN-60, Inspection of Plastic Pipes, Fittings and Joints Using Non-Destructive
Test Methods and Evaluation – includes sections about research, NDT/NDE considerations, inspec- tor qualification and evaluation procedures. The document is available for free at the PPI webpage. “The goal of TN-60 is to bring awareness to a number of factors when using NDT for inspecting plastic pipes, fittings and joints, while emphasising that due diligence is needed when selecting an NDT technology and inspection team,” said Sarah Patterson, technical director of PPI. “There is a high degree of complexity in reading the scans from an NDT inspection.” There is rising interest in the topic, says PPI, because NDT was previously done by individual firms. Now, had has made its way into the stand- ards organisation for the inspection of plastic pipes, fittings and joints. Randy Knapp, engineering director of PPI’s
Energy Piping Systems Division (EPSD), added: “It is important for the industry to know about NDT and NDE. This document will play an important role in moving these non-destructive processes forward responsibly.”
Chlorine testing Several speakers at last year’s Plastic Pipes in Infrastructure conference in Germany – organised by AMI – addressed how to test the effects on chlorinated chemicals on pipe. Marton Bredacs, a researcher at the Polymer
Competence Centre Leoben (PCCL) in Austria, told delegates of a preliminary model to assess the effect of chlorine dioxide on the lifetime of PE pipe grades. These types of chemicals cause effects such as
PORTABLE WATER HAS TO BE PROTECTED AGAINST POLLUTION
CONEXTRU GmbH delivers multilayer crossheads for applying barrier structures for existing extrusion lines.
office@conextru.eu www.conextru.eu
office@conextru.eu www.conextru.eu
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