Class 4 (4th Engineer) MEKG 📅 Jul 2022

Exam Question

(a) Sketch and describe a positive displacement pump where the fluid is displaced by the movement of piston. Why are such pump chosen for bilge pumping duties? (6)

(b)Explain the working principle of a double acting reciprocating pump. (4)

(i) why these pumps should not be started with the discharge valve closed and,

(ii) the purpose of accumulators fitted at the discharge in these pumps. (6)

Reference Answer

### (a) Piston-Type Positive Displacement Pump & Application for Bilge Pumping
A positive displacement pump where the fluid is displaced by the movement of a piston is commonly known as a reciprocating pump. A simple example is the single-acting piston pump.
**Description of a Single-Acting Reciprocating Pump:**
* **Principle of Operation:** This pump operates on the principle of positive displacement. A precisely defined (positive) volume of fluid is drawn into a cylinder on the suction stroke and then forced out into the discharge line on the delivery stroke. The volume delivered is directly proportional to the piston speed and pump dimensions.

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