Class 2 (2nd Engineer) MEKG 📅 Mar 2024

Exam Question

(a) State the advantages of using steam turbine propulsion power for vessels carrying L.N.G as 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 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 propulsion plant. The primary advantages are:
1. **Direct Utilization of Boil-Off Gas (BOG):**
* **Concept:** LNG is transported at its boiling point (-162°C). Despite insulation, heat ingress into the cargo tanks is unavoidable, causing a portion of the liquid cargo to continuously vaporize. This vapor is known as Boil-Off Gas (BOG).

Full answer on MeoMock — surveyor-grade reference answers for 7,000+ written exam questions.

View plans Browse library

← Browse more questions

Prepare on Android — MeoMock on Google Play