• Propeller shaft seals prevent water from entering the ship’s hull through the propeller shaft. They are located at the stern of the ship, where the propeller shaft passes through the hull.
• Stern tube seals prevent water from entering the ship’s hull through the stern tube. The stern tube is a cylindrical passage that runs through the hull and supports the propeller shaft.

Both propeller shaft seals and stern tube seals are essential for the safety and efficiency of a ship. If a seal fails, water can enter the hull, causing flooding and damage.

Propeller shaft seals are typically made of a flexible material, such as rubber or neoprene, that is compressed between two metal rings. The rings are held in place by a housing that is bolted to the hull.

Stern tube seals are also typically made of a flexible material, but they are more complex than propeller shaft seals. They often have multiple rings and a labyrinthine design that helps to prevent water from entering the hull.

Ship seals are subject to a lot of wear and tear, so they need to be regularly inspected and maintained. If a seal is found to be damaged, it should be replaced immediately.

The term “ship seals” can also refer to a type of fastener that is used to secure components within a ship’s system. These seals are typically made of metal and have a gasket that helps to prevent leaks.