PROCESSING | TRENCHLESS PIPE INSTALLATION
Right: Agru used trenchless installation to fit a PE100-RC pipe inside a leaking sewage pressure line near Linz
“The technical challenge was immense,” said
Thomas Peyrl, RTI’s regional manager north, who supervised the installation. “Shaping pipe strings more than 600m long on-site was also something new for us. We shaped the pipe strings at the construction site without any problems, and hardly affected traffic on the road.”
Long installation US-based Isco Industries has carried out the longest horizontal directional drilled (HDD) installation of high-density polyethylene (HDPE) pipe in the US and Canada, according to the Plastic Pipe Institute (PPI) – which recognised the achievement as one of its projects of the year. “Not only was this a very long pull, but the diameter of the pipe was also a challenge in replac- ing the existing sanitary sewer line in Miami Beach,” said Tony Radoszewski, president of PPI. “More than 4,200 feet of 54in diameter HDPE (PE4710) pipe was used, which was quite an accomplishment.” Failure of this force main – the only means of
wastewater conveyance for the city’s 90,000-plus residents – could potentially discharge millions of gallons of raw sewage along the urbanised corridor of a popular tourist destination, with huge economic effect. The existing 54in pre-stressed concrete cylinder
pipe (PCCP) sanitary sewage force main (FM) was installed in 1977 and by 2012 was deteriorating rapidly. A 54in IPS DR-17 HDPE pipe was chosen to replace it – with technical assistance, pipe fittings and fusion services provided by Isco. HDPE was chosen because of its low life cycle cost and monolithic features, and for its lightweight and ductile properties – making it ideal for HDD construction. Fusion was carried out with one of Isco’s 2065 MegaMc fusion machines operated by a certified technician. The highlight of the fusion operation was joining two strings (3,000ft and 1,200ft) of pipe during the pullback process. Using
HDPE pipe made HDD feasible, saving time and money on the project for the city, and allowing areas of a busy residential/tourist area to remain open during the construction of the line. The new pipe was pulled in two segments. This dual-string approach had two runs of pipe being fused and positioned in the centre of the roadway, which permitted local access for residents who could continue to drive along the perimeter lanes of the work area. Additionally, construction of a pedestrian bridge over the pipe installation area enhanced pedestrian mobility. “HDPE pipe is the tested and proven solution for
force main rehabilitation and trenchless construc- tion,” said Camille George Rubeiz, senior director
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