Santos Gladstone LNG (GLNG) has successfully pushed the final section of its gas transmission pipeline through a tunnel beneath the Gladstone Harbour to the LNG plant on Curtis Island.
The 120 pipeline segments, each measuring 36 m in length, were welded and pushed gradually through the 4.3 km tunnel over the past month using a large hydraulic jack. The tunnel was filled with seawater to buoy the 42 in. dia. pipeline as it was pushed through.
Santos Vice President Downstream GLNG, Rod Duke, said the delivery of the first under-sea crossing for Queensland’s CSG-to-LNG industry “brings our pipeline to its final stages of completion and demonstrates our ability to deliver world-class projects and operations.”
Duke added: “This year is about delivering milestones across Santos GLNG, and we’re particularly proud of this achievement given the innovation and expertise required to achieve a marine crossing like this one.
“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 km pipeline already buried on the mainland and Curtis Island.”
Pipeline pre-commissioning works are underway, with clean and gauge activities nearing completion and about half of the required hydrotesting completed. The pipeline route will be fully rehabilitated with initial reinstatement works, which are now more than 90% complete.
The gas transmission pipeline is being built by Santos GLNG’s contractor Saipem Australia, while the tunnel was constructed by subcontractor Thiess.Santos GLNG is a joint venture between Santos, Petronas, Total and Kogas to supply LNG to global markets.
Adapted from press release by Callum O'Reilly
Read the article online at: https://www.lngindustry.com/liquefaction/07052014/gladstone_lng_pushes_through_pipeline_540/