Class 4 (4th Engineer) MEKG 📅 May 2023

Exam Question

(a) What is meant by priming in the context of pump operation and explain why it is required? Name different ways of priming a pump? What is the effect on the pump in

case it is not primed? (6)

(b) Sketch and describe a 'self-priming unit of a centrifugal pump, Label it's parts and Explain how it operates? (10)

Reference Answer

### Part (a): Pump Priming
#### 1. Definition of Priming
Priming is the process of completely removing all air, gas, or vapor from the suction line and the pump casing, and filling these spaces with the liquid that is to be pumped. This ensures that the pump's impeller is fully submerged in the liquid before the pump is started.
#### 2. Why Priming is Required

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