Pasgt Q1

What is the primary function of stern tube seals?

• To enhance the speed of the vessel

• To prevent seawater ingress and contain lubricating oil

• To support the weight of the vessel

• To improve fuel efficiency

Which type of stern tube sealing system is known for its simplicity and low cost?

• Oil-lubricated Stern Tube Seal

• Lip Seal Type

• Double-acting Mechanical Seal

• Water-lubricated Stern Tube Seal

What is a common problem associated with lip seals?

• Seal face wear

• Heat buildup

• Water leakage

• Contamination of lubricant

Which sealing system is best suited for harsh conditions and high speeds?

• Oil-lubricated Stern Tube Seal

• Double-acting Mechanical Seal

• Water-lubricated Stern Tube Seal

• Lip Seal Type

What is a significant advantage of water-lubricated stern tube seals?

• High reliability

• Environmentally friendly

• High performance under extreme conditions

• Low maintenance costs

What is a disadvantage of oil-lubricated stern tube seals?

• Limited lubrication options

• High cost

• Environmental concerns due to oil leakage

• Complex design

What testing method is used to ensure the stern tube seal remains watertight?

• Pressure Tests

• Leakage Tests

• Temperature Monitoring

• Vibration Monitoring

What is a common countermeasure for water ingress in stern tube seals?

• Regularly inspect seals for wear

• Reduce operating speed

• Increase lubrication frequency

• Use only oil-based lubricants

What can excessive heat buildup in seals indicate?

• Low pressure conditions

• Seal degradation

• Proper lubrication

• Increased efficiency

What is a symptom of seal wear?

• Increased sealing efficiency

• No visible damage

• Fluid loss or contamination

• Improved lubrication