Case study

Node 4 HDD Conveyor Crossing

In 2013 Dunstans Construction Group completed a 140m HDD crossing for the Node 4 Gas Pipeline being constructed by AJ Lucas for Arrow Energy.

As a result of successfully completing the Isaac River HDD crossing, we were awarded an additional crossing for the Node 4 pipeline. The length of the crossing was ideal for our D100 drill spread and the crossing was successfully completed within a week of mobilisation.

  • HDD was selected as the preferred installation method of the gas pipeline due to the depth required to pass beneath the Carborough Downs Conveyor.
  • The pipeline was installed with no interruption to the Conveyor, which is located on the Vale mine site.
  • Our team delivered management plans, risk assessments and calculations as part of the design, construct and install project to assure all stakeholders that the crossing could be completed successfully.
  • Arrow Energy was limited by 125m of steel pipe with the appropriate epoxy coating for HDD installation, however the Dunstans design utilised a 15m lead-in trench on the pipe side –allowing a standard coating to be used for that section of pipe.

Dunstans delivered this project ahead of time, on budget and with no time lost due to injury – satisfying all safety and quality standards.

Project quick facts


Bundaberg Regional Council


Installation of a 10-inch gas pipeline under the Carborough Downs Conveyor by HDD

Project date

November 2013

Project location


Pipe type

10-inch carbon steel pipe (Grade B API 5L)

Crossing length


Project cost