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Types of vessel, offshore support

Types of vessels, offshore operations, supply vessel, stand-by vessel, AST vessel

- Specifications may vary from above, and capacities are approximate only.

- Fuel consumption figures are given as a guide for 24 hour continuous steaming but may vary by as much as 25% between operating at maximum and economic speeds.

1 Safety/stand-by vessels

  • Approx. fuel consumption (MT/day): 3-4
  • Length approximately 30 m
  • Twin engine 1000 BHP
  • Space for 90 survivors
  • Fully equipped in accordance with Government regulations and latest SOLAS requirements including rescue boat, searchlights, scrambling nets, radio communication, etc.

2 Small straight supply vessels

  • Approx. fuel consumption (MT/day): 10
  • Twin screw 2000 BHP
  • Total cargo deadweight 750 tonne (including fuel and water)
  • Chemical bulk tanks (120 m3 )
  • Clear deck space for casing
  • Refrigerated space to carry food
  • Accommodation for six passengers
  • Navigational equipment and radios
  • No winch

3 Small anchor handling supply tug (AST) vessels

  • Approx. fuel consumption (MT/day): 14
  • Twin engine 3000-4000 BHP for servicing jack-up type rigs
  • Bollard pull 35-40 tonne
  • Bow thruster
  • Cargo deadweight 700-750 tonne
  • Clear deck space
  • Chemical bulk tanks (140 m3)
  • Winch for towing and anchor handling
  • Accommodation for ten passengers
  • Fire monitors
  • Navigational and radio equipment

4 Medium anchor handling supply tug (AST) vessels

  • Approx. fuel consumption (MT/day): 17
  • Twin engine 6000 BHP
  • Bollard pull 70 tonne
  • Bow thruster
  • Anchor handling/towing winch
  • Stern roller
  • Joystick control
  • Cargo deadweight 900 tonne
  • Clear deck for transporting casing
  • Chemical bulk tanks (175 m3)
  • Full navigational and radio equipment
  • Firefighting capability

5 Large anchor handling supply tug (AST) vessels

  • Approx. fuel consumption (MT/day): 20
  • Twin screw 8000 BHP and over
  • Bollard pull 100 tonne and over
  • Bow thruster
  • Heavy duty winch for towing and anchor handling with chain wildcats
  • Chain lockers
  • Large diameter stern roller
  • Towing wire storage reels
  • Deep water mooring capability
  • Cargo deadweight 1200-1400 tonne
  • Chemical bulk tanks (200-250 m3)
  • Full navigational and radio equipment
  • Firefighting capability
  • Joystick control
  • Equipped and designed for burning heavy fuel