Class 2 (2nd Engineer) MEKG 📅 Apr 2019

Exam Question

With reference to Gear pumps used for lubricating oil transfer

(a) Sketch and describe a gear type pump indicating the flow of fluid

(b) State the materials that gear type pump components may be manufactured from

Reference Answer

### (a) Sketch and Description of a Gear Type Pump
A gear pump is a rotary positive displacement pump. The most common type used for lubricating oil services onboard is the external gear pump, which consists of two identical, inter-meshing gears enclosed within a close-fitting casing.
#### Construction
* **Casing:** A robust housing, typically made of cast iron, which contains the pump's internal components. It features precisely machined internal surfaces to ensure minimal clearance with the gear teeth, maximizing efficiency.

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