Class 2 (2nd Engineer) MEKG 📅 Jul 2022

Exam Question

(a) State the advantages of usnig steam turbine propulsion power of vessels carying L.N.G. as cargo.

(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;

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

Reference Answer

(a) The advantages of using steam turbine propulsion power for vessels carrying LNG (Liquefied Natural Gas) as cargo include:
1. Utilization of Boil-Off Gas (BOG): LNG naturally evaporates (boils off) during the voyage. Steam turbines can directly burn this boil-off gas in the boilers, eliminating the need for complex re-liquefaction systems.
2. Simple and Reliable Operation: Steam turbines have fewer moving parts compared to diesel engines, leading to high reliability and lower maintenance requirements.
3. Flexible Fuel Usage: Boilers in steam turbine systems can burn multiple fuels (BOG, heavy fuel oil, marine diesel oil), offering fuel flexibility.

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