Vessel Name
Boa Sub C / Boa Deep C
DWT at 8.6m Draught
9,000t
Fuel Oil
2,800m³
Fresh Water
1,300m³
Water Ballast/Drill Water
3,700m³
Chain Lockers
1,600m³
Lube Oil
200m³
Hydraulic Oil
65m³
Oily Water Tank
45m³
Sewage Tank
140m³
Grey Water Tank
140m³
Sludge Tank
87m³
Waste Oil Tank
75m³
Drain Tank
27m³
Bilge Tank
30m³
Accommodation
90 persons in 90 cabins. Ten additional Pullman beds in ten cabins
Total Accommodation
100 beds
Free Deck Space
1,150m²
Moon Pool
7.2m x 7.2m
Total Length
120m
Breadth Moulded
27m
Depth to 1st deck
11.6m
Depth to 2nd deck
7.8m
Scantling Draught
8.8m
GRT
12,400t
DWT
9,000t
2 x 9,000kW
Propulsion 18,000kW
1 x 1,200kW
Azimuth 1,200kW
Gensets
2 x 2,420kW, 2 x 1,820kW, 1 x 910kW
Shaft Generators
2 x 4,800kW
Total Capacity
18,992kW
Thrusters
2 x 1,425kW forward and aft thrusters
Total Thuster Capacity
6,900kW
Tugger Winches
Five tugger winches
Bollard Pull
260t
Max Speed
15k
Eco. Speed
12.5k
Inner Diameter
3,500mm
External Diameter
5,700mm
Width
5,800mm
Capacity
8,100m of 90mm wire
Capstans
2 x 15t
The Boa Sub C and Boa Deep C are two offshore support vessels designed to support Chevron’s deepwater offshore developments in the Gulf of Mexico. The Boa Sub C is being used for the offshore installation activities of Chevron’s Blind Faith platform.
Boa Sub C
The Boa Sub C has an overall length of 120m, a moulded breadth of 27m and a draught of 8.8m. The depth to the first deck is 11.6m. It’s gross tonnage is 12,400t and it’s deadweight is 9,000t. The vessel has a helideck designed for a Super Puma/S61 helicopter.
The ship has 105 single cabins, with ten equipped with Pullman beds. The vessel’s facilities include a cinema, gymnasium and sauna.
The Boa Sub C has a fuel oil capacity of around 2,800m³ and can carry 3,700m³ water ballast/drill water. It can also carry 1,300m³ of fresh water.
In addition, the vessel can carry tanks of lube oil (200m³), hydraulic oil (65m³) oily water (45m³), sewage (140m³), grey water (140m³), sludge ( 87m³) waste oil (75m³), drain ( 27mf³) and bilge (30m³).
The vessel is equipped with a 400t AHC mid-ship crane and a 30t AHC stern crane, capable of working at a depth of 3,000m. The mid-ship crane, supplied by National Oilwell Varco, has a hoisting speed of 35m/min at 200t and its working radius is 42m.
For data and telephone communication, the vessel has been equipped with Dual VSAT C-band system. The vessel also supports an ethernet data communication network.
Boa Deep C
The Boa Deep C has two work-class remotely operated underwater vehicle (ROV) hangars on its port and starboard. It uses two Oceaneering Millenium-designed ROVs rated at 3,000m water depth. The ROVs can be deployed in a typical wave height of 4.5m.
The vessel is installed with a 250t AHC mid-ship crane and 30t AHC stern crane, capable of operating up to a depth of 2,000m.
The ship has 1,150m² of free deck space. In order to carry out installation work, the deck is reinforced for a specific load of 15t per square metre.
Power is provided by two 2,420kW generator sets, two 1,820kW sets and a 910kW genset. There is also a pair of 4,800kW shaft generators, giving a total capacity of 18,992kW.
The vessel’s main propulsion is based on two 9,000kW engines and a 1,200kW azimuthing propeller, giving a total output of 19,200kW. In order to manoeuvre, there is a pair of fore and aft 1,425kW tunnel thrusters.
The Boa Deep C’s total thrust capacity is 6,900kW, allowing a bollard pull of over 260t, a maximum speed of 15kt and an economy speed of 12.5kt. The vessel is equipped with anti-heel and roll damping tanks.
The ship has an active heave compensated crane with a 250t lifting capacity at 15m and a working depth of 2,000m. A 500t anchor handling drum (with an inner diameter of 3,500mm and a 5,700mm external diameter) has a capacity for 8,100m of 90mm diameter wire.
