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Construction of 122-kilometre dual diameter carbon steel nearshore pipeline connecting the Barossa Gas Export Pipeline to the Darwin LNG (DLNG) facility in Australia’s Northern Territory.
Company: Santos
Location: Offshore Darwin, NT, Australia
Water depth: 20 - 55 metres
Initial 32 km by Sandpiper; 90 km by Audacia
Nearshore pull-in to Darwin LNG (DLNG) facility
Tie-in spool connecting DPD to Barossa Gas Export pipeline
Scope of work
- Engineering and installation of 122-km, dual diameter (26-inch; 34-inch) carbon steel pipeline with external anti-corrosion and concrete coating
- Nearshore pull-in to Darwin LNG (DLNG) facility
- Design, fabrication, and installation of 1x PLET and 1x ILT
- Spool fabrication and installation
- Pipeline trenching and rock protection
- Mattress installation and span rectification
- Pre-commissioning activities (flooding, cleaning, gauging, hydro-testing, dewatering and packing of the pipeline with nitrogen)
- Post-lay and as-built surveys
- Landfall site and pipe-pull preparations
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Specials & challenges
- Strong tidal currents up to 4 knots in harbour area
- Tidal range up to 8 metres combined with congested seabed requiring pre-engineered anchor positions
- Intense heat and humidity complicating stringent welding criteria
- Installation of 100-tonne ILT too large to pass through tensioners as single unit
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