Class 1 (Chief Engineer) Engineering Management 📅 Jul 2025

Exam Question

(a) Explain the phenomenon of liquefaction of solid bulk cargo, including the conditions under which it occurs and its contributing factors. (5)

(b) Briefly discuss the dangers posed by liquefaction to the stability and safety of a vessel, providing examples of incidents caused by liquefaction. (5)

(c) Outline the preventive measures and regulatory guidelines for minimizing the risk of cargo liquefaction during loading, transportation, and discharge. (6)

Reference Answer

### (a) The Phenomenon of Liquefaction of Solid Bulk Cargo (5 Marks)
#### Concept and Mechanism
Liquefaction is a physical phenomenon where a solid bulk cargo, which appears to be in a solid, granular state, abruptly transforms into a fluid-like viscous mass. This transformation occurs when the shear strength of the material is lost due to an increase in pore water pressure, primarily triggered by the cyclic loading from a ship's motion.
The mechanism can be detailed as follows:

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