Case study

WIF Interconnect Pipeline

In 2014, Dunstans Construction Group was contracted by Transfield Services Australia to install 1.6km of Steel 600mm OD gas interconnection pipeline as part of QGC’s Wandoan Interconnect Facility (WIF) Pipeline project.

The lateral project was part of the QCLNG upstream program. Our team, using internal plant items (including DCG’s 4 CAT D594 side-boom pipe layers) completed the works during January and February 2014. At the client’s request, Dunstans staff worked on the project’s set up during December: securing materials, working on delivery methodologies and constructability planning.

The scope included excavation and laying approximately 1.6km of 24” (600mm) steel gas pipeline, with each pipe 18m long and weighing 3400kg. More than half the alignment was solid rock trenching, and our team also completed sand bedding and final compaction to QA standards.

Compaction was a difficult task during one of Queensland’s biggest droughts as water was very limited: so maintaining moisture content in the bedding sand was a constant challenge.

Dunstans methodology and sequencing:
  • Mobilisation, purchase and transport of the plant and materials to site
  • Right of way (ROW) Construction
  • Stringing of the pipeline on the ROW
  • Assisting welders using our side booms to align pipe to be welded
  • Carrying welding plant along the ROW to help welding crews
  • Helping to prepare and coat the welds using the side booms
  • Designing lifting plans for approval by the client for lowering in of the pipe
  • Trenching the alignment
  • Preparation of the bedding
  • Lowering in of the welded and coated pipe
  • Running identification tape and warning material
  • Backfill, compaction and testing to QA Standard
  • Final grade and reinstatement

Dunstans exceeded client expectations by completing this project on time, with no environmental impact and no time lost due to injury.

Project quick facts


Transfield Services Australia


Installaton of 600mm OD gas pipeline as part of QGC’s WIF Pipeline Project

Project date

January – February 2014

Project location

Wandoan, Queensland

Pipe type

600mm OD Carbon steel gas pipe

Pipe length


Project cost

$6 million