Class 2 (2nd Engineer) MEKG 📅 Dec 2024

Exam Question

(a) State the advantages of using steam turbine propulsion power for vessels carrying L.N.G. cargo. (8)

(b) With regard to the use of L.N.G. cargo as boiler fuel explain. (8)

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

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

Reference Answer

### (a) Advantages of Steam Turbine Propulsion for LNG Carriers
Steam turbine propulsion has been the traditional and highly reliable choice for LNG carriers primarily due to its synergy with the nature of the cargo. The main advantages are as follows:
1. **Direct Utilization of Boil-Off Gas (BOG)**:
* **Concept**: LNG is transported at its atmospheric boiling point (-161.5°C). Inevitable heat ingress into the cargo tanks causes a portion of the LNG to continuously vaporize, creating Boil-Off Gas (BOG). This BOG must be removed to prevent over-pressurization of the cargo tanks.

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