Stern Tube Solutions
Stop Leakage, Water Ingress & Seal Support
Common Stern Tube Challenges
Stern tube systems operate under continuous rotation, load variation, seawater exposure, and long-term sealing stress. Over time, these conditions can increase friction and wear, affect oil condition, and lead to oil leakage, water ingress, or reduced seal performance.
Oil Leakage
Progressive leakage can increase oil consumption, environmental exposure, and maintenance pressure.
Water Ingress
Water contamination may reduce lubricant performance and increase wear or corrosion risk.
Seal & Wear Issues
Worn interfaces, vibration, and fluctuating loads can affect sealing stability and component life.
Unplanned Downtime
Seal-related issues can create pressure for early intervention, off-hire, or unplanned dry dock.
Stern Tube Technical Insight
Learn more about our solutions, product logic and application factors behind the stern tube range.
Built Around Stern Tube Operating Conditions
Stern tube systems operate under demanding and variable conditions that can gradually affect sealing and lubrication performance.
Key operating factors include:
- Continuous shaft rotation
- Load variation and pressure changes
- Shaft movement and vibration
- Lubricant exposure and temperature variation
- Seawater-related risk and contamination exposure
Why it matters:
Over time, these conditions may contribute to leakage, water ingress, seal wear, and reduced lubrication stability.
A Progressive Solution Structure
The ST range is structured from preventive protection to stronger sealing support.
The range is built around four application levels:
- ST Guard — preventive protection for stable systems
- ST Seal Core — standard support for smaller leakage cases
- ST Seal Plus — reinforced support for moderate leakage or demanding conditions
- ST Seal Max — maximum support for severe leakage cases
Why it matters:
This structure helps operators identify a relevant starting point based on system condition and leakage behaviour.
Product Selection Factors
The right product depends on the actual system and operating situation.
Typical selection factors include:
- Leakage behaviour and development over time
- System oil volume
- Lubricant type currently in use
- Seal condition and wear pattern
- Operating profile and load variation
- Service objective before next maintenance window or dry dock
Why it matters:
These factors help determine whether the focus should be preventive protection, standard sealing support, or stronger leakage mitigation.
Technical Review Before Application
A technical review helps ensure that the selected solution matches the real system condition.
Relevant review points include:
- Current leakage level
- Signs of water ingress or contamination
- Lubricant and filter conditions
- Seal arrangement and worn interfaces
- Operating environment and service window
- Time available before planned maintenance or dry dock
Why it matters:
A short technical review reduces the risk of choosing the wrong solution and creates a clearer basis for product recommendation.
Want to learn more about stern tube systems?
Read our technical overview of stern tube lubrication, sealing,
bearing types, EAL considerations, and lifecycle performance.
Need help selecting the correct stern tube solution?
Send us your vessel details, and we'll help assess dosage, application, and compatibility.