Santos takes pipeline under Gladstone Harbour to GLNG gas plant

The final section of a gas transmission pipeline has been
successfully pushed through a tunnel beneath the Gladstone harbour to the Santos
GLNG plant on Curtis Island.

The 120 pipeline segments, each measuring 36 metres in length,
were welded together and pushed gradually through the 4.3 kilometre tunnel using a
large hydraulic jack, and seawater to buoy the 42 inch pipe.

The operation took around four weeks to complete.

The 3.45 metre under-sea tunnel runs eight metres below the
sea bed, and was drilled with a tunnel boring machine, 100 metres long and weighing 277
tonnes.

Santos vice-president downstream GLNG Rod Duke said the pipeline
would soon be ready to deliver gas to Curtis island.

“This year is about delivering milestones across Santos
GLNG,” Duke said.

“Santos
GLNG delivered the first under-sea crossing for Queensland’s CSG to LNG industry.

“We’re particularly proud of this achievement, given
the innovation and expertise required to achieve a marine crossing like this
one.

Duke also said he pipeline route will be fully
rehabilitated.

“When
we set out to build a 420 kilometre pipeline from Fairview field to Gladstone
we promised to safeguard the environment,” he said.

“Our under-sea tunnel has allowed us to cross The
Narrows without disturbing the local marine environment and with minimal impact
to the surrounding coastal environments.

“In the coming weeks the marine crossing pipe will be
connected to the rest of Santos GLNG’s 420 kilometre pipeline.”

Pipeline
pre-commissioning works are well underway, with clean and gauge activities
nearing completion and about half of the required hydro-testing completed.

The
gas transmission pipeline is being built by Santos GLNG’s contractor Saipem
Australia, while the tunnel was constructed by subcontractor Thiess.

To keep up to date with Australian Mining, subscribe to our free email newsletters delivered straight to your inbox. Click here.