Marine Seals

What is a seal?

In the marine propulsion industry, a “seal” typically refers to a mechanical seal used to prevent the leakage of fluids, such as water or oil, in various parts of a ship’s propulsion system. These seals are crucial components in ensuring the safe and efficient operation of marine engines and propulsion systems.

Types of Seals

Shaft Seals: These are installed around the propeller shaft to prevent water from entering the ship’s hull and oil or grease from escaping the engine room. Common types include lip seals, mechanical face seals, and stuffing box seals.

Stern Tube Seals: Specialised shaft seals at the point where the propeller shaft exits the hull, maintaining a watertight seal while allowing shaft rotation.

Gland Seals (Stuffing Box Seals): Used to seal rotating shafts in ship machinery, involving compressing packing material around the shaft for a seal.

Lip Seals: Found in marine components like pumps and hydraulic systems, they prevent fluid leakage with a flexible lip sealing against the shaft. Learn more.

Mechanical Face Seals (Duo-Cone or Floating Seals): Used in heavy-duty applications like marine engines, consisting of two metal rings with a sealing face to prevent contaminants from entering and lubricating oil from escaping.

The choice of seal depends on the application, fluid type, and operating conditions. Proper maintenance and monitoring are vital for vessel safety and environmental protection.