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Installation of gas and oil export pipeline system, including 2.5-kilometre steel catenary risers (SCRs), to serve the Sparta deepwater development in the Gulf of Mexico
Company: Oceanus Pipeline Company
Location: Gulf of Mexico (270 kilometres off the Louisiana coast)
Water depth: 1555 metres
Installation of 2.5-kilometre SCRs
Sparta oil & gas lines part of major new deepwater export system Allseas installing in the Gulf
Scope of work
- Design & fabrication of 10-inch dual hub PLET, pipeline heads, installation aids, protection structures for stress joints and inline valves assemblies
- Supply of strakes for SCRs & spans
- Installation of 2.5-km, 16-inch SCR (wet-parked) followed by a 98-km, 18-inch oil pipeline
- Installation of 2.5-km,10-inch SCR (wet-parked) followed by a 28-km, 10-inch gas pipeline
- Installation of 10-inch dual hub PLET in J-mode
- Installation of crossing mattresses
- Pre- and post-lay survey
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Specials & challenges
- Installation of 2x 2.5-kilometre SCRs (wet parked for installation by third party)
- Installation of 35-m long steel TSJ assembly for the 16-inch SCR start
- Installation of 2x inline main isolation valve with removable protection structure at the SCR startups
- Weather preparation – GoM hurricanes
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