Bundles and towed installation

10

Bundles and towed installation

SELECTED PIPELINE BUNDLE PROJECTS

6,520 m (16,626ft) 3,810 m (12,571 ft) 6,800 m (22,440 ft) 7,449 m (24,583 ft) 1,775 m (5,855 ft) 1328 m (4,382 ft) 6,753 m (22,286ft) 7,203 m (23,770 ft) 2,200 m (7,260 ft) 4,100 m (13,532 ft) 3,600 m (11,811 ft) 5,000 m (16,404 ft) 238 m (786 ft)

BP

1995 Cyrus

711 mm (28 in)

116 m (381ft)

Statoil

1997 Åsgard

1080 mm (42.5 in) 320 m (1050 ft)

BHP

2000 Keith

622 mm (24.5 in)

124 m (407 ft)

ExxonMobil

2003 Skene NBR

1156 mm (45.5 in)

118 m (387 ft)

Total

2004 MCP01

1041 mm (41 in)

94 m (308 ft)

BP

2008 Machar

775 mm (30.5 in)

85 m (279 ft)

BP Norge

2009 Valhall

1270 mm (50 in)

85 m (279 ft)

Apache

2011 Bacchus

1028 mm (40.5 in)

105 m (344 ft)

BP

2011 Andrew

881 mm (34.7 in)

116 m (381 ft)

Hess

2012 South Arne

912 mm (35.9 in)

60 m (197 ft)

ConocoPhillips 2012 Jasmine

889 mm (35 in)

82 m (269 ft)

940 mm (37 in)

90 m (295 ft)

Premier

2016 Catcher

813 mm (32 in)

91 m (299 ft)

Repsol Sinopec 2016 Montrose

Summary A summary of bundles installed using the controlled-depth tow (CDT) method: 77 bundles installed in the North Sea upto 2013; Longest to date in a single tow is 7.2 km (4.4 miles); Costs can vary from $6M to $14M per km ($10M to $22M per mile), depending upon the complexity and scope of work to be undertaken. It should be noted that this cost is more than S-lay or J-lay for a single flowline – but the lengths are short, so the mobilisation and demobilisation costs for a laybarge are high also. The towed installation method relies on savings from simultaneous installation of multiple lines combined with the tow/trailhead structures (which double as manifolds or other infrastructure) using relatively lower-cost standard tugs. It should be noted that the table is restricted to the CDT method only. Single on- or near- bottom tows in the Gulf of Mexico have been longer. Flat-pack bundles in Angola have been installed in much deeper water – over 1000 m (3300 ft). The largest diameter carrier pipe to date is 1422 mm (56 in) on the West Franklin bundle that was installed in 2013 Total Jura is worth a special mention due to the largest ever tow head at 500 tonnes.