Exam Question
Describe the Stern Tube Lubrication System by drawing a schematic diagram and explaining function of each component. (16)
Class 4 (4th Engineer)
MEP
📅 Oct 2025
Reference Answer
### **1. Purpose and Concept of Stern Tube Lubrication System**
The Stern Tube Lubrication System is a critical machinery support system designed to perform three primary functions for the propeller shaft and its supporting bearings within the stern tube:
* **Lubrication:** To create a hydrodynamic oil film between the rotating propeller shaft and the stationary stern tube bearings (typically white metal lined), minimizing friction and wear.
* **Cooling:** To dissipate the frictional heat generated in the bearings during shaft rotation, as well as any heat conducted from the seawater, maintaining the bearing material and lubricating oil within their safe operating temperature limits.
The Stern Tube Lubrication System is a critical machinery support system designed to perform three primary functions for the propeller shaft and its supporting bearings within the stern tube:
* **Lubrication:** To create a hydrodynamic oil film between the rotating propeller shaft and the stationary stern tube bearings (typically white metal lined), minimizing friction and wear.
* **Cooling:** To dissipate the frictional heat generated in the bearings during shaft rotation, as well as any heat conducted from the seawater, maintaining the bearing material and lubricating oil within their safe operating temperature limits.
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