STERN TUBE SEAL / AFT SEAL FOR BIG SHIP

Summary

This video explains the function and importance of stern tube seals and propeller shaft seals in marine propulsion systems. Stern tube seals play a vital role in preventing seawater from entering the engine room while allowing the propeller shaft to rotate smoothly. The seals are designed to be durable, environmentally friendly, and capable of withstanding harsh conditions. The video covers the components of stern tube seals, such as tubes, bearings, and lubricants, and discusses their role in maintaining lubrication and preventing leaks. The importance of these seals in ensuring ship propulsion efficiency is emphasized.

Takeaways

• 😀 Stern tube seals prevent seawater from entering the engine room and allow the propeller shaft to rotate smoothly and freely.
• 😀 Oil-lubricated stern tubes require two types of seals: water seals and oil seals.
• 😀 The function of stern tube seals is to prevent the leakage of lubricating oil and prevent seawater contamination.
• 😀 Modern stern tube seals are highly engineered to withstand tough working environments for long periods.
• 😀 The ABS stern tube seals are specifically designed to prevent lubricating oil leakage and seawater intrusion.
• 😀 Stern tube seals consist of various components including tubes, bearings, connection flanges, temperature sensors, and lubrication systems.
• 😀 Stern tube seals are a crucial part of a ship’s propulsion system, ensuring reliable sealing conditions to protect the environment.
• 😀 Research on stern tube seals is limited due to the complexity of their setup and accessibility.
• 😀 The stern tube system is often tested with a dynamic setup to monitor the flow rate, torque, temperature, and lubrication migration.
• 😀 Rotary seals are placed at both ends of the stern tube to prevent lubricant leakage and seawater entry.
• 😀 The placement of the stern tube seals is crucial, with one located forward and the other up, as part of the normal arrangement.

Q & A

What is the primary function of stern tube seals?

The primary function of stern tube seals is to prevent water from entering the engine room and to allow the propeller shaft to rotate smoothly and freely.

What are the two types of seals required for oil-lubricated stern tubes?

Oil-lubricated stern tubes require two types of seals: water seals and oil seals.

How do modern stern tube seals function in a ship’s propulsion system?

Modern stern tube seals are highly engineered to withstand a rigorous working environment, preventing lubricating oil leakage and seawater contamination, while ensuring the smooth operation of the propeller shaft.

What is the function of the 'AB Seal' in stern tube systems?

The AB Seal prevents the leakage of lubricating oil from the stern tube outboard and prevents seawater from entering and contaminating the lubricating system.

What are some of the key components in the stern tube seals?

Key components of the stern tube seals include tubes, bearings, connection flanges, temperature sensors, pipes, and lubrication systems.

Why are stern tube seals considered crucial on ocean-going vessels?

Stern tube seals are crucial because they ensure the continuous rotation of the propeller shaft without seawater seeping into the vessel, which is vital for the ship's propulsion and overall operation.

What makes stern tube seals environmentally friendly?

Modern stern tube seals are designed to be environmentally friendly by minimizing the risk of lubricant leakage and preventing the contamination of seawater.

How do dynamic setups for monitoring stern tube seals work?

Dynamic setups for monitoring stern tube seals replicate the operating conditions of the system. They monitor parameters like the flow rate across the seal, torque, operating temperature, and lubricant migration under various shaft velocities and pressure differences.

What is the role of rotary seals in the stern tube system?

Rotary seals in the stern tube system prevent lubricant leakage and the entry of water into the stern tube, ensuring proper sealing during the shaft’s rotation.

Why is the engine power primarily used to overcome water resistance in the stern tube system?

Engine power is used primarily to overcome the water resistance in the stern tube system, ensuring that the propeller shaft can rotate without excessive friction or interference.