Section 7 Positioning Systems

701. Thrusters and Propulsion Machinery

The vessel is to have thrusters and during fire fighting operations and as

propulsion machinery of sufficient power for maneuverability follows.

48 Guidance for Offshore Support Vessels 2015

702. Positioning

Thrusters and the vessel’s propulsion machinery are to be able to maintain the vessel on position in still water during all combinations of operation and capacity of the water monitors, at not more than 80 percent of available propulsion force in any direction.

703. Control

Adequate operating control systems are to be provided for fire-fighting operations which are to in- clude an alarm condition at 80 percent of available propulsion power and automatic reduction of power action at 100 percent available propulsion power to prevent sudden or complete loss of pow- er due to power overload. Calculations are to be submitted verifying that an equilibrium state be- tween the reaction force from the water monitors and the force from the vessel's propulsion machi- nery and its side thrusters (at the most unfavorable combination) is at or less than 80 percent of the available propulsion power. This is to confirm that the vessel would maintain its position with- out setting off the 80 percent alarm condition.