Class 4 (4th Engineer) MEKG 📅 Jun 2025

Exam Question

(a) Why are centrifugal pumps used for the sea and cooling water services with marine diesel engines? What are their drawbacks? (6)

(b) What do you understand by the term 'pump characteristics'? (6)

Reference Answer

### (a) Use and Drawbacks of Centrifugal Pumps for Cooling Services (6 Marks)
Centrifugal pumps are the standard choice for sea water (SW) and LT (Low Temperature) Central Cooling Water services on board ships due to a combination of their design, performance characteristics, and reliability.
**Reasons for Use (Advantages):**
* **High Volumetric Flow Rate:** Cooling systems require the circulation of large volumes of water to effectively transfer heat from machinery. Centrifugal pumps are designed as roto-dynamic machines, ideal for delivering high flow rates at the relatively low to medium pressures required in these systems.

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