Case study

Isaac River HDD Crossing – Moranbah

In 2013, Dunstans Construction Group was contracted by AJ Lucas to design, construct and install a 300mm steel pipeline in Moranbah, as part of Arrow Energy’s Node 3 Gas Pipeline.

We mobilised our 250 tonne Horizontal Directional Drill (HDD) spread
to complete the 550m crossing beneath three waterways including the Isaac River.

  • HDD was selected as the preferred method to install the gas pipeline, due to the site’s proximity to highly sensitive environmental and cultural heritage areas.
  • The pipeline was installed with no impact on environmentally
    or culturally sensitive areas.
  • Our consultant team provided high-level management plans to ensure compliance with all environmental and cultural heritage issues, and conducted regular audits to fulfil these requirements
    to the satisfaction of Arrow Energy.
  • The site’s remote conditions and limited availability of water were challenging.. Using the Dunstans camel tanker acting for water storage and the self-contained cleaning system on site, we were able to overcome these challenges.

Dunstans successfully completed this project on time and budget, exceeding the expectations of AJ Lucas and Arrow Energy, and satisfying all stringent safety and quality standards.

Project quick facts


AJ Lucas / Arrow Energy


Design, construct and install a 300mm gas pipeline under the Isaac River by HDD

Project date

September 2013 – October 2013

Project location

Moranbah, Queensland

Pipe type

12 inch carbon steel pipe (Grade B API 5L)

Crossing length


Project cost