Class 2 (2nd Engineer) MEKG 📅 Oct 2023

Exam Question

(a) State the advantages of using steam turbine propulsion power for vessels carrying LNG cargo (6)

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

(i) The safety precautions relating to the 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)
Steam turbine propulsion has historically been the prime mover of choice for LNG carriers due to several inherent advantages directly related to the nature of the cargo. A surveyor-grade answer would detail these as follows:
1. **Inherent Utilization of Boil-Off Gas (BOG)**:
* **Concept**: LNG is transported at its atmospheric boiling point of approximately -163°C. Despite tank insulation, heat ingress is unavoidable, causing a portion of the cargo to continuously vaporize. This vapor is known as Boil-Off Gas (BOG).

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