What is a function of sea water compensated fuel storage tanks?

The function of sea water compensated fuel storage tanks is to keep fuel levels consistent, particularly in marine applications. These tanks are designed to accommodate the variations in fuel levels that occur as fuel is consumed by the vessel's engines.

When fuel is used from the tank, the volume of the remaining fuel decreases, and to prevent the formation of vapor space above the fuel—which could lead to fuel vapor escaping or the risk of fire—sea water is introduced into the tank. This sea water fills the space left by the consumed fuel, maintaining a consistent level of liquid in the tank.

Moreover, the introduction of sea water can also help to balance the weight and buoyancy of the ship, contributing to stability. This design feature is important for operational efficiency and safety in maritime fuel management.

Other options do not fit the primary function of these tanks: storing fresh water or holding human waste are unrelated to fuel storage, while segregating contaminants is typically handled by other systems, such as filtration or settling tanks, rather than directly within the design of fuel storage tanks.