Horizontal directional drilling (HDD) has replaced an ageing water pipeline in California, US.
Originally installed for the World’s Fair in 1915, the old pipeline was replaced with a new alignment running beneath the Upas Street highway in San Diego.
Due to the rising elevation of the land and the constrained work space, Crossing Group elected HDD for the project, in addition to Fusible PVC® pipes.
A thinner alternative to high-density polyethylene pipe, Fusible PVC requires less space to store and assemble on site, which proved beneficial in the constrained work space.
A protective casing for the section of line running under the highway was required, and as a result, once the pilot hole and reaming were completed, the contractor pulled the 30 inch (762 mm) casing and 24 inch (610 mm) line simultaneously.
The pipeline was ballasted by water to minimise frictional drag as the pipe was pulled in.
The work took place in one of San Diego’s most prolific parks; however, access to local facilities, such as a park trail, was only impeded for one weekend.
For more information visit the Crossing Group website.
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