PROCESSING | TRENCHLESS PIPE INSTALLATION
Sliplining in one pull US-based Murphy Pipelines recently installed 4,180ft of sliplining 32in HDPE pipe – in one pull – along an existing concrete pipe in Powell River, a city in British Columbia, Canada. The existing pipe – the only water supply – runs
nearly 4,400ft from Haslam Lake to a new UV water treatment plant. Environmental protection was critical in the new
project: the existing concrete water main was originally installed in 1964, and since then the trench in which it sits has filled with water to create a wetland that houses birds and animals. “The original consideration was to drain the
Above: Isco used more than 3,300ft of 54in HDPE pipe in an HDD project in Miami
of engineering for the municipal and industrial division of PPI. “The strength and flexibility of PE4710 made it ideal for this longest and largest HDPE pull. The time and money it would have taken to dig up and replace the existing line would have made this project unrealistic.”
In-house programme Tulsa is one of a number of cities in the USA to introduce its own in-house trenchless technology programme, says the North American Society for Trenchless Technology (NASTT). It recently purchased a butt fusion machine from
McElroy Manufacturing to carry out slip-lining. The machine can fuse 6-18in HDPE pipe. Initially, the slip-lining was done using a sewer
cleaning bucket machine (towable winch) to pull the HDPE pipe in. Five years ago, a Hammerhead HydroGuide HG1200AT constant tension winch was brought in to replace the bucket machine for pulling slip-lines, according to an article in the Texas & Oklahoma Trenchless Report, from NASTT. After buying the HydroGuide, the city purchased a CIPP point repair liner system from LMK Tech- nologies. This included all the tooling necessary to complete CIPP point repairs from 3-30ft in length, at diameters of 8-24in. “That is a good capability to make point repairs
Right: Murphy Pipelines
sliplined more than 4,000ft of 32in HDPE
pipe in one pull
in areas you definitely don’t want to dig up,” said Philip Howery, utility systems operations manager, for the city of Tulsa water and sewer department. The city has more than 1,900 miles of sanitary sewer pipe in diameters of 6-66in. With most of the pipe installed before 1970, the majority of the sanitary sewer system is close to – or beyond – the 50 year design life. “We wanted flexibility to address emergency and high difficulty repairs without having to wait for a contract or access a high-cost emergency contract – and developing in-house capability was the answer,” said Howery.
42 PIPE & PROFILE EXTRUSION | September 2018
www.pipeandprofile.com
entire wet land that had formed since the original construction of the 36in water main and split the slip lining into multiple sections,” said the com- pany. “However slip lining the entire length in one pull allowed the wet land to remain untouched.” Flexibility of the HDPE allowed slip lining of the
entire length through the curved pipe. Seismic resistance was critical as the original concrete pipe was installed in a curved alignment, which meant joints on bends are deflected – translating to low seismic performance characteristics. During a seismic event the pipe could separate at the joints and the pipe could act as a conduit for draining Haslam Lake. Hydraulic performance with a C-factor of 150
means the selected 32in HDPE pipe had the required flow to supply water to Powell River. Life expectancy using Pace (an online tool from PPI) confirmed a design life of more than 100 years for the HDPE pipe.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.agru.at �
www.isco-pipe.com �
www.plasticpipe.org �
www.mcelroy.com �
www.murphypipelines.com
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