What is a sea chest, and what is its role in the ship's cooling system?

What is a sea chest, and what is its role in the ship's cooling system?

• A. An underwater storage tank for ballast water.
• B. An inlet box in the hull that houses strainers and piping to supply seawater to the cooling system.
• C. A compartment for fresh water storage.
• D. A filter unit for engine lubrication.

Answer: (B)

The sea chest is an inlet box built into the hull, usually below the waterline, that collects seawater and houses the strainers and piping that feed the ship’s cooling system. Its key role is to provide a clean, steady source of seawater for the cooling circuits by keeping debris out with strainers and delivering the water to the seawater pump and heat exchangers. This cooled water takes heat from the engine and other machinery and then is discharged or cycled as designed. It’s not ballast water storage, not fresh water storage, and not a filter unit for lubrication.

The sea chest is an inlet box built into the hull, usually below the waterline, that collects seawater and houses the strainers and piping that feed the ship’s cooling system. Its key role is to provide a clean, steady source of seawater for the cooling circuits by keeping debris out with strainers and delivering the water to the seawater pump and heat exchangers. This cooled water takes heat from the engine and other machinery and then is discharged or cycled as designed. It’s not ballast water storage, not fresh water storage, and not a filter unit for lubrication.