Class 2 (2nd Engineer) MEKG 📅 Sep 2023

Exam Question

With reference to the carriage and pumping of liquefied gas cargo:

(a) Sketch a suitable pumping system labelling the component parts. (5)

(b) State

(i) Why submerged hydraulically driven pumps are not used. (3)

(ii) How overheating of pump drive shaft bearings is avoided (3)

Reference Answer

### (a) Liquefied Gas Cargo Pumping System
A common and suitable pumping system for liquefied gas carriers is the deep-well centrifugal pump, installed in each cargo tank. This design ensures that the prime mover is located safely outside the hazardous cargo space.
**Construction and Operation:**
1. **Pump Unit:** A multi-stage centrifugal pump is located at the bottom of the cargo tank, often within a sump, to ensure it remains submerged and maintains suction even at low cargo levels.

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