CompressionFit HDPE Pipe Lining
for 16" through 78" water transmission
& sewer force main replacement
Governed by ASTM F3508, the Compression Fit HDPE pipe lining technology specifies an HDPE pipe with an outside diameter larger in size than the inside of the host pipe to be renewed. After the HDPE is butt fused to correspond to the pull distance, the pipe is pulled through a reduction die immediately before entering the host pipe. This reduces the HDPE pipe temporarily below the ID of the host pipe allowing it to be inserted.
While the towing load keeps the HDPE under tension during the pull, the pipe remains in its reduced size. The HDPE remains fully elastic throughout the reduction and installation process. After installation, the pulling load is removed. The HDPE pipe expands until it is halted by the inside diameter of the host pipe. The effectively natural ‘tight’ or ‘compression fit’ is accepted as exchanging an existing failing pipeline with a composite pipe in its place.
42-inch steel sewer force main after CompressionFit as HDPE pipe forms tight compression fit within host pipe.
History of CompressionFit:
The principle of CompressionFit was developed over 30 years ago to address the problem of failing pipeline systems that were buried and entangled with other utilities throughout urban and rural areas. The success of the HDPE compressive fit lining process within the utilities industry, lead to further extensive development and testing work by British Gas to apply the technology to other sectors. It is currently considered by the pipeline industry as the benchmark in polymer lining technology due to its ability to deliver cost effective lining solutions in essentially every environment.
With an extensive list of successfully completed projects across the globe, the technology has been proven in many extreme projects spanning three decades onshore and subsea. Projects have been completed for water, sewer force main, mining, hydrocarbons, chemicals, bulk products and gas distribution. The technique can be used for rehabilitation of ageing pipes of any material in order to extend life of the asset, or new pipelines onshore and subsea as alternatives to a corrosion allowance or use of a CRA pipe material.