MATERIALS | PE100
Fuschlsee is of drinking water quality and that should remain so. The new lake pressure pipeline serves as a backup and provides us with additional safety, as it can go into operation within minutes in an emergency.” Together, the partners chose a plastic pipeline
made of Agru’s PE 100-RC material, as studies showed that a PE pipeline of this quality can last up to 80 years. “We are satisfied with the planning and delivery as well as with the quality of the Agru pipeline,” he said.
Water update Separate to this – in a suburb of Vienna – water company EVN has renovated a piping system that has been in place since the 1960s. With dimen- sions of OD 560mm and 630mm, the capacity of the system has been doubled. The 20km long pressure pipeline, supplied by Agru, is made of its stress crack resistant PE 100-RC material. The pipes were delivered to the site in 20m lengths in order to reduce the number of required welds. In addition, around 200 pipe bends and more than 250 electrofusion couplers were used. This way, clean and safe drinking water was provided for 150,000 people in the district, for a total investment of around €10 million (US$11m). The new pipeline has a total weight of about 1400 tonnes. Fittings were of particular importance in this
project. Until now, only pipes made of PE 100-RC could be laid without sand-bed, as PE 100-RC fittings were not available. However, by providing a complete PE 100-RC system – including both pipes and fittings that were precisely machined to size – Agru ensured that the entire pipeline could be installed uniformly and without special treatment of the fittings.
Right: HDPE pipe from Pipeline Plastics is delivering drinking water to North Pole, Alaska, after tests found chemicals in the local groundwater
HDPE for Alaska A winner of last year’s Plastics Pipe Institute (PPI) awards included a pipe application that carries potable water across Alaska, USA. Last year, Alaska’s Department of Environmental
Conservation discovered chemicals in the drinking water in the Fairbanks region. The chemicals, perfluoroalkyls, are used in products such as firefighting foam, and had found their way into the groundwater. A long-term solution for the inhabitants of the
city of North Pole has been to install a new HDPE potable water pipeline in sizes of 6, 8,10, 12 and 16in – pre-insulated with polyurethane foam – to ensure uninterrupted source of water during Alaska’s harsh winters. HDPE pipe, from Pipeline Plastics, provided a tough, durable, seismic resistant supply line. In all, the project consists of 35 miles of pipe,
expansion of the North Pole water treatment plant and a 750,000 gallon potable water reservoir. At the same time, PPI has helped the US-based Municipal Advisory Board (MAB) to update its specification guide for PE4710 pipe – which is similar to PE100 – in certain applications. The MAB-3 Model Specifications Guide for PE 4710 Buried Potable Water Service, Distribution and Transmission Pipes and Fittings is now available in updated form. The document covers system design parameters, quality control, pressure classes, pipe and fittings, training and inspection, joining meth- ods such as butt fusion, saddle fusion, socket fusion, electrofusion and mechanical, plus open cut and trenchless installation for water services (0.75 to 3in per AWWA C901), and for water distribution and transmission (4 to 65in per AWWA C906). Addition- ally, MAB-3 provides an appendix with a list of references from ASTM, AWWA, MAB, NSF and PPI. “This model specification was originally pre-
pared and now has been updated by MAB members and associates as a service to the
water industry,” said Camille George Rubeiz, co-chair of MAB. “It is intended as a guide for engineers, users, contractors, code officials, and other interested parties for use in the design, and installation of HDPE pressure water piping systems. The local utility or engineer may need to modify this model specification to adapt the document to local conditions, operations, and practices.” The document is available free of charge here.
Lasting a century The PE100+ association, which represents materi- als producers, says that various technical assess- ments and studies have shown that buried PE pipes
40 PIPE & PROFILE EXTRUSION | April 2020
www.pipeandprofile.com
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