Exam Question
(a) Name the different types of lubricating principles used in the lubrication of ships machinery (10)
(b) Give examples in each case, stating the names of machinery/ components/ system where same applied (6)
Class 4 (4th Engineer)
MEKG
📅 Feb 2023
Reference Answer
### (a) Different Types of Lubricating Principles
Four primary principles of lubrication are employed in marine machinery to minimize friction, wear, and heat generation between moving parts. The selection of a specific principle depends on the load, speed, component geometry, and operating conditions.
#### 1. Hydrodynamic Lubrication (Full Film Lubrication)
* **Principle**: This regime provides complete separation of two surfaces in relative motion by a continuous, thick film of lubricating oil. The film pressure required to support the load is generated internally by the relative motion of the surfaces dragging the viscous fluid into a converging, wedge-shaped gap.
Four primary principles of lubrication are employed in marine machinery to minimize friction, wear, and heat generation between moving parts. The selection of a specific principle depends on the load, speed, component geometry, and operating conditions.
#### 1. Hydrodynamic Lubrication (Full Film Lubrication)
* **Principle**: This regime provides complete separation of two surfaces in relative motion by a continuous, thick film of lubricating oil. The film pressure required to support the load is generated internally by the relative motion of the surfaces dragging the viscous fluid into a converging, wedge-shaped gap.
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