Murrarie Looping Project
Brisbane, Queensland, Australia
How do you install 905 metres of steel gas pipeline at a depth of 10 metres below the Brisbane River? The Diona Queensland team on behalf of APA Group recently undertook this complex task.
The ageing gas infrastructure linking the network between the north and south of Brisbane required replacing to ensure longevity of services and provide a secondary connection pipeline.
APA Group engaged Diona to undertake the installation of 1.9 kilometres of DN300 steel pipeline using both open cut and trenchless Horizontal Directional Drilling (HDD) methods.
The most complex task on this project was installing 905 metres of the pipeline under the Brisbane River from Murrarie to Pinkenba via HDD. Diona and the APA team successfully navigated all river lease boundaries on either side of the river and carried out the above ground pipe string and testing prior to undertaking the HDDs. More than 70-personnel assisted with the pipe pull through over a 24-hour period with a drilling depth cover of 10 metres under the river bed. Due to access constraints, the pipe was suspended six metres over a driveway on Paringa Road using two franna cranes and six excavators to support the pipe. With the assistance of Coe Drilling, the horizontal directional drilling work was performed using an American Augers DD1080 500t rig and a gyroscopic survey instrument guidance system for tracking the drill under the Brisbane River.
Detailed planning in the design and methodology ensured the accuracy of the alignment installation. All HDD pipelines tested above ground prior to installation and coating integrity tests complete post pull through to ensure lifespan of pipeline.