Class 2 (2nd Engineer) MEKG 📅 Nov 2024

Exam Question

(a) State the advantages of using steam turbine propulsion power for vessels carrying L.N.G. cargo. (6)

(b) With regard to the use of L.N.G. cargo as boiler fuel explain:

(i) The safety precautions relating to that gas pipeline supplying the boiler and burning the gas in the boiler. (6)

(ii) The means of getting rid of "excess gases" during loading or discharge. (4)

Reference Answer

### (a) Advantages of Using Steam Turbine Propulsion for LNG Carriers (6 Marks)
The selection of steam turbine propulsion for LNG carriers, particularly in traditional designs, is based on a unique synergy between the cargo and the power plant. The primary advantages are:
1. **Direct Utilization of Boil-Off Gas (BOG):**
* LNG is carried at its atmospheric boiling point (-163°C). Despite insulation, heat ingress is unavoidable, causing a portion of the cargo to continuously vaporize, creating Boil-Off Gas (BOG).

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