Propeller and shafting installation. International standards

What is the primary purpose of the stern tube bearing?

• Support the propeller hub

• Minimize noise in the engine room

• Support the propeller shaft through the hull

• Prevent water ingress to the hull

What is a key advantage of lubricated stern tube bearings?

• Environmentally friendly operation

• Reduced friction and wear

• Noise reduction

• Reduced installation costs

Which type of stern tube bearing is considered environmentally friendly?

• Composite bearing

• Lubricated bearing

• Non-lubricated bearing

• Roller bearing

A tapered fit is preferred for:

• Small, low-speed vessels

• Vessels with high torque loads

• Ships with keyed propeller hubs

• Environmentally sensitive areas

Which method involves heating or cooling components to ensure a tight fit?

• Keyed fit

• Tapered fit

• Shrink fit

• Composite fit

What is a common issue in propeller and shaft materials exposed to seawater?

• Thermal fatigue

• Galvanic corrosion

• Wear due to vibrations

• Mechanical overload

Marine shafts are typically made of:

• Aluminum alloys

• High-strength steel alloys

• Cast iron

• Plastic composites

What must shaft materials withstand besides corrosion?

• Heat expansion

• Cyclic and torsional stresses

• Low temperature

• Chemical resistance

The shaft diameter is calculated based on:

• The length of the shaft

• Vibration control requirements

• Torque, material strength, and safety factors

• Alignment and vibration considerations

Intermediate bearings are used to:

• Reduce vibration

• Support longer shafting systems

• Prevent corrosion

• Improve flexural strength